Tokushima University / Educator and Researcher Directory --- Yoshida, Ken

Personal Web Page

https://sites.google.com/view/yoshidagroup

https://researchmap.jp/kenyoshida (researchmap)

https://orcid.org/0000-0001-8350-5044 (ORCID)

Field of Study

○	Physical Chemistry, Solution Chemistry

Subject of Study

○	Physical Chemistry in Liquids and Fluids

Book / Paper

Book:

1.	Ken Yoshida : Chronological Scientific Tables 2024, Maruzen Publishing Co., Ltd., Tokyo, Nov. 2023.
2.	Ken Yoshida : Chronological Scientific Tables 2023, Maruzen Publishing Co., Ltd., Tokyo, Nov. 2022.
3.	Ken Yoshida : Encyclopedia of High Pressure Science & Technology, 朝倉書店, Tokyo, Nov. 2022.
4.	Ken Yoshida : Chronological Scientific Tables 2022, Maruzen Publishing Co., Ltd., Tokyo, Nov. 2021.
5.	Ken Yoshida : 化学便覧基礎編改訂6版, Maruzen Publishing Co., Ltd., Tokyo, Jan. 2021.
6.	Ken Yoshida : Chronological Scientific Tables 2021, Maruzen Publishing Co., Ltd., Tokyo, Nov. 2020.
7.	Ken Yoshida and : Chronological Scientific Tables 2020, Maruzen Publishing Co., Ltd., Tokyo, Nov. 2019.
8.	Ken Yoshida and : Chronological Scientific Tables 2019, Maruzen Publishing Co., Ltd., Tokyo, Nov. 2018.
9.	Ken Yoshida and : Chronological Scientific Tables 2018, Maruzen Publishing Co., Ltd., Tokyo, Nov. 2017.
10.	Masaru Nakahara and Ken Yoshida : Chronological Scientific Tables 2017, Maruzen Publishing Co., Ltd., Tokyo, Nov. 2016.
11.	Masaru Nakahara and Ken Yoshida : Chronological Scientific Tables 2016, Maruzen Publishing Co., Ltd., Tokyo, Dec. 2015.
12.	Ken Yoshida and Masaru Nakahara : 極限環境の生体分子過酷な環境下での機能を科学する(CSJカレントレビュー17)，2章 Basic concept-1, 高圧力の化学の基礎, Kagaku-Dojin Publishing Company,INC, Kyoto, Nov. 2014.

Academic Paper (Judged Full Paper):

1.	Ken Yoshida, Shinnosuke Suhara and Naoki Noguchi : Effect of Cage Occupancies on Molecular Vibrations of Methane in Structure H Clathrate Hydrate: Ab Initio Molecular Dynamics Simulation, The Journal of Physical Chemistry B, Vol.128, No.23, 5727-5734, 2024. (Summary) The structure H (sH) of methane hydrate, which has a distinctive structure with large (LL) cages capable of encapsulating multiple methane molecules, has been suggested as a methane reservoir in large icy bodies such as Titan, making it important in planetary science. This high-pressure phase, which exists in the GPa range, lends itself to the study of methane states and dynamics using powerful experimental techniques such as IR and Raman spectroscopy. However, the interpretation of the vibrational spectra of methane in the sH structure has been challenging because of the spectral complexities. The signals attributed to the methane molecules in the LL cage, as well as those of the other two cage types, overlap in the spectra. In this study, we investigated the microscopic origins of the shape of the C-H stretching vibration spectrum of methane in the LL cage using ab initio molecular dynamics (AIMD) simulations. For a single methane molecule in the LL cage, the ν band of the C-H stretching mode was observed at a higher frequency typical of isolated molecules in vacuum due to the large size of the LL cage. As the number of methane molecules in the LL cage increased beyond one, a tendency to blue-shift with increasing methane occupancy was observed, consistent with a loose-cage-tight-cage model. By characterizing the time correlation function of methane stretching vibrations based on the solvation number of methane and water molecules proximal to methane within the LL cage, we showed that the complicated spectral line shape observed in cases of higher methane occupancy in the LL cage resulted from the wider variation of the solvation shell states. Analysis of the solvation structures of the AIMD trajectories provided interpretations of the experimental spectral line shape, demonstrating the complementary nature of AIMD to the experiment and its effectiveness in analysis. (Tokushima University Institutional Repository) ● Metadata: 119418 (Link to Publication Site) ● Publication site (DOI): 10.1021/acs.jpcb.4c01790 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 38832921 ● Summary page in Scopus @ Elsevier: 2-s2.0-85195305203 (Tokushima University Institutional Repository: 119418, DOI: 10.1021/acs.jpcb.4c01790, PubMed: 38832921, Elsevier: Scopus)
2.	Ken Yoshida, Ayato Doi, Haruka Yoshioka, Tomohiro Hirano and Masaru Nakahara : Nuclear Magnetic Resonance Analysis of Hydrothermal Reactions of Ethyl- and Octylamine in Sub- and Supercritical Water, The Journal of Physical Chemistry A, Vol.127, No.17, 3848-3861, 2023. (Summary) Hydrothermal reactions of aliphatic amines have recently gained importance in relation to the application of amines as film-forming corrosion inhibitors for steam-water cycles. The kinetics and mechanism of the hydrothermal reactions of ethylammomiun cation (EtAH) and -octylammonium cation (OctAH) were studied for comparison with the corresponding neutral amines to elucidate their reaction products and pathways at sub- and supercritical temperatures of 300-400 °C as model reactions of aliphatic ammonium cations. We analyzed the reaction of C-N-labeled EtAH using NMR spectroscopy and revealed that the initial hydrolysis to ethanol, known as the main path, is followed by the elimination reaction producing ethene and the disproportionation reaction giving diethylammonium cation. The OctAH yields octene and octanol, each of which isomerizes to thermodynamically more stable species as the major products. Comparisons were made between the reactions of the neutral amines and ammonium cations to highlight their different reactivity. The hydrolysis, alkene formation, and dehydration of alcohols to alkenes were all found to be accelerated at low pH. The formation of low-molecular-weight organic acids such as acetic acid and formic acid was not observed. These results indicate that the corrosion protection effect of film-forming amines will be maintained under practical conditions with pH values as high as around 9 to 10, and hence side reactions involving byproducts will be suppressed. (Tokushima University Institutional Repository) ● Metadata: 119419 (Link to Publication Site) ● Publication site (DOI): 10.1021/acs.jpca.3c01213 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 37093710 ● Search Scopus @ Elsevier (PMID): 37093710 ● Search Scopus @ Elsevier (DOI): 10.1021/acs.jpca.3c01213 (Tokushima University Institutional Repository: 119419, DOI: 10.1021/acs.jpca.3c01213, PubMed: 37093710)
3.	Toshihide Horikawa, Miku Okamoto, Ayaka Kuroki-Matsumoto and Ken Yoshida : Significant role of counterion for lead(II) ion adsorption on carbon pore surface, Carbon, Vol.196, 575-588, 2022. (Link to Publication Site) ● Publication site (DOI): 10.1016/j.carbon.2022.05.031 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1016/j.carbon.2022.05.031 (DOI: 10.1016/j.carbon.2022.05.031)
4.	Haruka Yoshioka, Ken Yoshida, Naoki Noguchi, Tomoyuki Ueki, Kei-ichiro Murai, Kazuya Watanabe and Masaru Nakahara : Microscopic Structure and Binding Mechanism of the Corrosion-Protective Film of Oleylpropanediamine on Copper in Hot Water, The Journal of Physical Chemistry C, Vol.126, No.14, 6436-6447, 2022. (Tokushima University Institutional Repository) ● Metadata: 116877 (Link to Publication Site) ● Publication site (DOI): 10.1021/acs.jpcc.2c00526 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1021/acs.jpcc.2c00526 (Tokushima University Institutional Repository: 116877, DOI: 10.1021/acs.jpcc.2c00526)
5.	Ken Yoshida and Haruka Yoshioka : Solvation shell dynamics of supercritical water-cyclohexane mixtures in relation to the translational and rotational dynamics as studied by molecular dynamics simulation, AIP Advances, Vol.11, No.7, 075219, 2021. (Tokushima University Institutional Repository) ● Metadata: 116130 (Link to Publication Site) ● Publication site (DOI): 10.1063/5.0057093 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1063/5.0057093 (Tokushima University Institutional Repository: 116130, DOI: 10.1063/5.0057093)
6.	Toshihide Horikawa, Ryuto Yuasa, Ken Yoshida and D.D. Do : Temperature Dependence of Water Cluster on Functionalized Graphite, Carbon, Vol.183, 380-389, 2021. (Tokushima University Institutional Repository) ● Metadata: 116123 (Link to Publication Site) ● Publication site (DOI): 10.1016/j.carbon.2021.07.024 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1016/j.carbon.2021.07.024 (Tokushima University Institutional Repository: 116123, DOI: 10.1016/j.carbon.2021.07.024)
7.	Ken Yoshida, Haruka Yoshioka, Natsuko Ushigusa and Masaru Nakahara : 14N NMR Evidence for Initial Production of NH3 Accompanied by Alcohol from the Hydrolysis of Ethylamine and Butylamine in Supercritical Water, Chemistry Letters, Vol.50, No.2, 316-319, 2020. (Tokushima University Institutional Repository) ● Metadata: 116129 (Link to Publication Site) ● Publication site (DOI): 10.1246/cl.200783 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1246/cl.200783 (Tokushima University Institutional Repository: 116129, DOI: 10.1246/cl.200783)
8.	Ken Yoshida and Masaru Nakahara : Self-diffusion of water-cyclohexane mixtures in supercritical conditions as studied by NMR and molecular dynamics simulation, The Journal of Chemical Physics, Vol.150, No.17, 174505, 2019. (Summary) The self-diffusion coefficients of water (D) and cyclohexane (D) in their binary mixtures were determined using the proton pulsed field gradient spin-echo method from medium to low densities in subcritical and supercritical conditions. The density (ϱ), temperature (T), and water mole fraction (x) are studied in the ranges 0.62-6.35 M (M = mol dm), 250-400 °C, and 0.109-0.994, respectively. A polynomial fitting function was developed for a scaled value of Ξ = ϱDT with ϱ, T, and x as variables in combination with a comprehensive molecular dynamics (MD) simulation. The NMR and MD results agree within 5% for water and 6% for cyclohexane, on average. The differences between D and D in the dependence on ϱ, T, and x are characterized by the activation energy E and the activation volume ΔV expressed by the scaled fitting function. The decrease in the ratio D/D and the increase in the E of water with increasing x are related to the increase in the number of hydrogen bonds (HBs). The D value for a solitary water molecule at a low x is controlled by the solvation shell, most of which is occupied by nonpolar cyclohexane molecules that provide less friction as a result of weaker interactions with water. A microscopic diffusion mechanism is discussed based on an analysis of the HB number as well as the first-peak height of the radial distribution functions that are taken as measures of the potential of the mean field controlling self-diffusion. (Tokushima University Institutional Repository) ● Metadata: 116439 (Link to Publication Site) ● Publication site (DOI): 10.1063/1.5047540 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 31067893 ● Summary page in Scopus @ Elsevier: 2-s2.0-85065533273 (Tokushima University Institutional Repository: 116439, DOI: 10.1063/1.5047540, PubMed: 31067893, Elsevier: Scopus)
9.	Tomohiro Hirano, Ken Yoshida, Miyuki Oshimura and Koichi Ute : High-Pressure and High-Temperature NMR Observation of Synthetic Polymers: High-Resolution Measurement Taking Advantage of Motional Narrowing in Sub-Critical Fluids, The Review of High Pressure Science and Technology, Vol.28, No.2, 95-101, 2018. (Link to Publication Site) ● Publication site (DOI): 10.4131/jshpreview.28.95 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-85050754096 (DOI: 10.4131/jshpreview.28.95, Elsevier: Scopus)
10.	Tomohiro Hirano, Yuya Miyamoto, Shinya Amano, Kazuya Tatsumi, Takuya Anmoto, Hiroshi Kimura, Ken Yoshida, Miyuki Oshimura and Koichi Ute : Hydrogen-bond-assisted isotactic-specific radical polymerization of N-vinyl-2-pyrrolidone with tartrate additives in toluene at low temperatures: high-resolution 1H NMR analysis, RSC Advances, Vol.4, No.95, 53079-53089, 2014. (Summary) A diethyl L-tartrate (L-EtTar)-assisted radical polymerization of N-vinyl-2-pyrrolidone has been developed as the first reported example of the synthesis of isotactic-rich poly(N-vinyl-2-pyrrolidone) (PVP). The addition of L-EtTar in toluene at temperatures of -40 °C and lower led to a significant increase in the polymer yield by one order of magnitude compared with the reaction in the absence of L-EtTar. Decreasing the polymerization temperature led to increases in the isotacticity of the PVP, with the mm triad reaching 66.4% at -93 °C. 1H NMR measurement at 920 MHz was conducted to establish a reliable strategy for quantifying the triad tacticities. High-temperature NMR measurements at 250 °C were performed using a specially-designed NMR probe, which led to dramatic narrowing of the 1H line width. (Tokushima University Institutional Repository) ● Metadata: 115212 (Link to Publication Site) ● Publication site (DOI): 10.1039/C4RA08743G (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1039/C4RA08743G (Tokushima University Institutional Repository: 115212, DOI: 10.1039/C4RA08743G)
11.	Ken Yoshida, Nobuyuki Matubayasi, Yasuhiro Uosaki and Masaru Nakahara : Effect of Rotational Couplings on Vibrational Spectrum Line Shape of Bending Mode in Low-Density Supercritical Water: Density and Hydrogen Isotopes Dependencies, Journal of Solution Chemistry, Vol.43, No.9-10, 1499-1508, 2014. (Link to Publication Site) ● Publication site (DOI): 10.1007/s10953-014-0220-1 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-84912113639 (DOI: 10.1007/s10953-014-0220-1, Elsevier: Scopus)
12.	Hiroshi Kimura, Masaki Hirayama, Ken Yoshida, Yasuhiro Uosaki and Masaru Nakahara : Effect of Water on Hydrolytic Cleavage of Non-Terminal α-Glycosidic Bonds in Cyclodextrins To Generate Monosaccharides and Their Derivatives in a Dimethyl SulfoxideWater Mixture, The Journal of Physical Chemistry A, Vol.118, No.8, 1309-1319, 2014. (Summary) Hydrolytic cleavage of the non-terminal α-1,4-glycosidic bonds in α-, β-, and γ-cyclodextrins and the anomeric-terminal one in d-maltose was investigated to examine how the cleavage rate for α-, β-, and γ-cyclodextrins is slower than that for d-maltose. Effects of water and temperature were studied by applying in situ (13)C NMR spectroscopy and using a dimethyl sulfoxide (DMSO)-water mixture over a wide range of water mole fraction, xw = 0.004-1, at temperatures of 120-180 °C. The cleavage rate constant for the non-anomeric glycosidic bond was smaller by a factor of 6-10 than that of the anomeric-terminal one. The glycosidic-bond cleavage is significantly accelerated through the keto-enol tautomerization of the anomeric-terminal d-glucose unit into the d-fructose one. The smaller the size of the cyclodextrin, the easier the bond cleavage due to the ring strain. The remarkable enhancement in the cleavage rate with decreasing water content was observed for the cyclodextrins and d-maltose as well as d-cellobiose. This shows the important effect of the solitary water whose hydrogen bonding to other water molecules is prohibited by the presence of the organic dipolar aprotic solvent, DMSO, and which has more naked partial charges and higher reactivity. A high 5-hydroxymethyl-2-furaldehyde (5-HMF) yield of 64% was attained in a non-catalytic conversion by tuning the water content to xw = 0.30, at which the undesired polymerization by-paths can be most effectively suppressed. This study provides a step toward designing a new optimal, earth-benign generation process of 5-HMF starting from biomass. (Link to Publication Site) ● Publication site (DOI): 10.1021/jp412628y (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 24527672 ● Summary page in Scopus @ Elsevier: 2-s2.0-84897635657 (DOI: 10.1021/jp412628y, PubMed: 24527672, Elsevier: Scopus)
13.	Hiroshi Kimura, Ken Yoshida, Yasuhiro Uosaki and Masaru Nakahara : Effect of Water Content on Conversion of D-Cellobiose into 5-Hydroxymethyl-2-furaldehyde in DimethylsulfoxideWater Mixture, The Journal of Physical Chemistry A, Vol.117, No.43, 10987-10996, 2013. (Summary) Noncatalytic conversion of D-cellobiose (at 0.5 M) into 5-hydroxymethyl-2-furaldehyde (5-HMF), a platform chemical for fuels and synthetic materials, was analyzed at 120-200 °C over a wide range of water mole fraction, xw = 0.007-1 in a binary dimethyl sulfoxide (DMSO)-water mixture by means of the in situ (13)C NMR spectroscopy. Effects of the water content were revealed as follows: (i) The tautomerization of the anomeric residue of D-cellobiose from D-glucose to D-fructose type was not initially observed at a lower water content, in contrast to the significant tautomerization into the D-fructose type in a higher water content and pure water. (ii) The lower the water content, the faster the glycosidic-bond cleavage by hydrolysis, because of the high reactivity of solitary water molecules with the large partial charges more naked as in supercritical water clusters due to the isolation by the organic solvent DMSO. (iii) The amount of D-fructose as the intermediate product was larger at the higher xw; despite the increase of D-fructose, the production of 5-HMF from D-fructose was slowed down. (iv) A high 5-HMF yield of 71% was reached at xw = 0.20-0.30 that was 6-10 times the initial D-cellobiose concentration. The best yield of 5-HMF was attained in the low xw region when the polymerization paths into NMR-undetectable species via 5-HMF and anhydromonosaccharides were effectively suppressed. This study provides a new framework to design optimal, noncatalytic reaction process to produce 5-HMF from cellulosic biomass by tuning the water content as well as the temperature and the reaction time. (Keyword) Cellobiose / Dimethyl Sulfoxide / Furaldehyde / Molecular Structure / Temperature / Water (Link to Publication Site) ● Publication site (DOI): 10.1021/jp407801u (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 24147840 ● Search Scopus @ Elsevier (PMID): 24147840 ● Search Scopus @ Elsevier (DOI): 10.1021/jp407801u (DOI: 10.1021/jp407801u, PubMed: 24147840)
14.	Ken Yoshida, Nobuyuki Matubayasi, Yasuhiro Uosaki and Masaru Nakahara : Effect of heavy hydrogen isotopes on the vibrational line shape for supercritical water through rotational couplings, The Journal of Chemical Physics, Vol.138, No.13, 134508, 2013. (Summary) The rotational couplings, which determine the infrared spectral line shape in the low-density supercritical water, were analyzed as functions of the density and the temperature by applying molecular dynamics simulation to a flexible water model, SPCFw and by varying the moment of inertia of the water through substitution for the H atom in H2O by heavy hydrogen isotopes. The differences in the frequency and the relative intensity between the sharp center peak and the rotational broad side-bands were analyzed for the O-H, O-D, and O-T stretch spectra. The frequency differences between the sharp center peak and the rotational broad side-bands are linearly correlated with the inverse of the moment of inertia of the isotope-substituted water species. The intensity of the sharp peak is associated with the long-time component of the reorientational time correlation function for the stretching bond vector. At 400 °C, where a substantial amount of hydrogen bonds are dynamically persisting, an intensity decrease in the rotational broad side-bands was observed with increasing density from 0.01 to 0.40 g cm(-3), respectively, corresponding to 0.56 and 22.2 M (=mol dm(-3)), orders of magnitude higher than the ideal gas densities. This arises from the decrease in the correlation time of the angular velocity and the rotational couplings due to an increase in the hydrogen-bonding perturbation. The intensity decrease of the rotational side-bands with increasing density is more significant for the water isotopes with heavier hydrogens. At a high temperature of 1200 °C, the rotational side-bands at 0.01 to 0.05 g cm(-3) were more distinct than those at 400 °C, and even at a medium density of 0.40 g cm(-3) a significant signal broadening due to the rotational couplings was clearly observed because of the accelerated rotational momentum. The vibrational spectrum cannot be decomposed into definite chemical clusters for the thermodynamic and kinetic analysis because of the dynamic origin. (Link to Publication Site) ● Publication site (DOI): 10.1063/1.4798933 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 23574245 ● Search Scopus @ Elsevier (PMID): 23574245 ● Search Scopus @ Elsevier (DOI): 10.1063/1.4798933 (DOI: 10.1063/1.4798933, PubMed: 23574245)
15.	Ken Yoshida, Nobuyuki Matubayasi, Yasuhiro Uosaki and Masaru Nakahara : Density effect on infrared spectrum for supercritical water in the low- and medium-density region studied by molecular dynamics simulation, The Journal of Chemical Physics, Vol.137, No.19, 194506, 2012. (Summary) The origin of the line shape of the O-H stretch vibrational spectrum is analyzed for supercritical water in the low- and medium-density region by using classical molecular dynamics simulation for the flexible point-charge model, SPC/Fw. The spectrum calculated for the water model is in good agreement with the experimental one in the low-density region. The spectral origins in the low-density region of 0.01-0.04 g cm(-3) are assigned to a sharp peak due to the bond oscillation along the O-H vector and two broad bands due to the rotational coupling, by taking an isolated single molecule as a reference in the low-density limit. The bands due to the rotational coupling reduce in intensity with increasing density as the rotations are more hindered by the hydrogen-bonding interactions, and their intensities increase with increasing temperature due to the accelerated rotational motion. The O-H stretch oscillation in the time correlation function attenuates in a timescale comparable with the lifetime of the hydrogen bonds, and the spectra conditioned by the number of hydrogen bonds are dominantly controlled by the local solvation structure. (Link to Publication Site) ● Publication site (DOI): 10.1063/1.4767352 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 23181325 ● Search Scopus @ Elsevier (PMID): 23181325 ● Search Scopus @ Elsevier (DOI): 10.1063/1.4767352 (DOI: 10.1063/1.4767352, PubMed: 23181325)
16.	Jianjun Pan, Qiang Chen, Dan Willenbring, Ken Yoshida, Tommy Tillman, B. Ossama Kashlan, Aina Cohen, Xiang-Peng Kong, Yan Xu and Pei Tang : Structure of the pentameric ligand-gated ion channel ELIC cocrystallized with its competitive antagonist acetylcholine, Nature Communications, Vol.3, 714, 2012. (Summary) ELIC, the pentameric ligand-gated ion channel from Erwinia chrysanthemi, is a prototype for Cys-loop receptors. Here we show that acetylcholine is a competitive antagonist for ELIC. We determine the acetylcholine-ELIC cocrystal structure to a 2.9-Å resolution and find that acetylcholine binding to an aromatic cage at the subunit interface induces a significant contraction of loop C and other structural rearrangements in the extracellular domain. The side chain of the pore-lining residue F247 reorients and the pore size consequently enlarges, but the channel remains closed. We attribute the inability of acetylcholine to activate ELIC primarily to weak cation-ϖ and electrostatic interactions in the pocket, because an acetylcholine derivative with a simple quaternary-to-tertiary ammonium substitution activates the channel. This study presents a compelling case for understanding the structural underpinning of the functional relationship between agonism and competitive antagonism in the Cys-loop receptors, providing a new framework for developing novel therapeutic drugs. (Keyword) Acetylcholine / Crystallography, X-Ray / Cysteine Loop Ligand-Gated Ion Channel Receptors / Ion Channel Gating / Ligand-Gated Ion Channels / Models, Molecular / Molecular Dynamics Simulation / Pectobacterium chrysanthemi / Protein Structure, Quaternary / Protein Structure, Tertiary / Quaternary Ammonium Compounds / Static Electricity (Link to Publication Site) ● Publication site (DOI): 10.1038/ncomms1703 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 22395605 ● Search Scopus @ Elsevier (PMID): 22395605 ● Search Scopus @ Elsevier (DOI): 10.1038/ncomms1703 (DOI: 10.1038/ncomms1703, PubMed: 22395605)
17.	Megumi Shintani, Ken Yoshida, Shun Sakuraba, Masaru Nakahara and Nobuyuki Matubayasi : NMR-NOE and MD Simulation Study on Phospholipid Membranes: Dependence on Membrane Diameter and Multiple Time Scale Dynamics, The Journal of Physical Chemistry B, Vol.115, No.29, 9106-9115, 2011. (Summary) Motional correlation times between the hydrophilic and hydrophobic terminal groups in lipid membranes are studied over a wide range of curvatures using the solution-state (1)H NMR-nuclear Overhauser effect (NOE) and molecular dynamics (MD) simulation. To enable (1)H NMR-NOE measurements for large vesicles, the transient NOE method is combined with the spin-echo method, and is successfully applied to a micelle of 1-palmitoyl-lysophosphatidylcholine (PaLPC) with diameter of 5 nm and to vesicles of dipalmitoylphosphatidylcholine (DPPC) with diameters ranging from 30 to 800 nm. It is found that the NOE intensity increases with the diameter up to ∼100 nm, and the model membrane is considered planar on the molecular level beyond ∼100 nm. While the NOE between the hydrophilic terminal and hydrophobic terminal methyl groups is absent for the micelle, its intensity is comparable to that for the neighboring group for vesicles with larger diameters. The origin of NOE signals between distant sites is analyzed by MD simulations of PaLPC micelles and DPPC planar bilayers. The slow relaxation is shown to yield an observable NOE signal even for the hydrophilic and hydrophobic terminal sites. Since the information on distance and dynamics cannot be separated in the experimental NOE alone, the correlation time in large vesicles is determined by combining the experimental NOE intensity and MD-based distance distribution. For large vesicles, the correlation time is found to vary by 2 orders of magnitude over the proton sites. This study shows that NOE provides dynamic information on large vesicles when combined with MD, which provides structural information. (Keyword) Cell Membrane / Magnetic Resonance Spectroscopy / Molecular Dynamics Simulation / Movement / Phospholipids / Solutions / Time Factors (Link to Publication Site) ● Publication site (DOI): 10.1021/jp204051f (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 21728286 ● Search Scopus @ Elsevier (PMID): 21728286 ● Search Scopus @ Elsevier (DOI): 10.1021/jp204051f (DOI: 10.1021/jp204051f, PubMed: 21728286)
18.	Ken Yoshida, Nobuyuki Matubayasi, Yasuhiro Uosaki and Masaru Nakahara : Scaled Polynomial Expression for Self-Diffusion Coefficients for Water, Benzene, and Cyclohexane over a Wide Range of Temperatures and Densities, Journal of Chemical and Engineering Data, Vol.55, No.8, 2815-2823, 2010. (Link to Publication Site) ● Publication site (DOI): 10.1021/je100206s (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1021/je100206s (DOI: 10.1021/je100206s)
19.	Ken Yoshida, Nobuyuki Matubayasi, Yasuhiro Uosaki and Masaru Nakahara : Self-diffusion in supercritical water and benzene in high-temperature high-pressure conditions studied by NMR and dynamic solvation-shell model, Journal of Physics: Conference Series, Vol.215, No.1, 012093, 2010. (Link to Publication Site) ● Publication site (DOI): 10.1088/1742-6596/215/1/012093 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1088/1742-6596/215/1/012093 (DOI: 10.1088/1742-6596/215/1/012093)
20.	Ken Yoshida, Nobuyuki Matubayasi and Masaru Nakahara : Self-diffusion coefficients for water and organic solvents at high-temperatures along the coexistence curve, The Journal of Chemical Physics, Vol.129, No.21, 214501, 2008. (Summary) The self-diffusion coefficients D for water, benzene, and cyclohexane are determined by using the pulsed-field-gradient spin echo method in high-temperature conditions along the liquid branch of the coexistence curve: 30-350 degrees C (1.0-0.58 g cm(-3)), 30-250 degrees C (0.87-0.56 g cm(-3)), and 30-250 degrees C (0.77-0.48 g cm(-3)) for water, benzene, and cyclohexane, respectively. The temperature and density effects are separated and their origins are discussed by examining the diffusion data over a wide range of thermodynamic states. The temperature dependence of the self-diffusion coefficient for water is larger than that for organic solvents due to the large contribution of the attractive hydrogen-bonding interaction in water. The density dependence is larger for organic solvents than for water. The difference is explained in terms of the van der Waals picture that the structure of nonpolar organic solvents is determined by the packing effect due to the repulsion or exclusion volumes. The dynamic solvation shell scheme [K. Yoshida et al., J. Chem. Phys. 127, 174509 (2007)] is applied for the molecular interpretation of the translational dynamics with the aid of molecular dynamics simulation. In water at high temperatures, the velocity relaxation is not completed before the relaxation of the solvation shell (mobile-shell type) as a result of the breakdown of the hydrogen-bonding network. In contrast, the velocity relaxation of benzene is rather confined within the solvation shell (in-shell type). (Keyword) Benzene / Cyclohexanes / Diffusion / Hydrogen Bonding / Magnetic Resonance Spectroscopy / Organic Chemicals / Solvents / Temperature / Water (Link to Publication Site) ● Publication site (DOI): 10.1063/1.3006420 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 19063563 ● Search Scopus @ Elsevier (PMID): 19063563 ● Search Scopus @ Elsevier (DOI): 10.1063/1.3006420 (DOI: 10.1063/1.3006420, PubMed: 19063563)
21.	Ken Yoshida, Nobuyuki Matubayasi and Masaru Nakahara : Self-diffusion coefficients for water and organic solvents in extremely low-density supercritical states, Journal of Molecular Liquids, Vol.147, No.1-2, 96-101, 2008. (Link to Publication Site) ● Publication site (DOI): 10.1016/j.molliq.2008.10.006 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1016/j.molliq.2008.10.006 (DOI: 10.1016/j.molliq.2008.10.006)
22.	Cristiano Giordani, Chihiro Wakai, Ken Yoshida, Emiko Okamura, Nobuyuki Matubayasi and Masaru Nakahara : Cholesterol Location and Orientation in Aqueous Suspension of Large Unilamellar Vesicles of Phospholipid Revealed by Intermolecular Nuclear Overhauser Effect, The Journal of Physical Chemistry B, Vol.112, No.9, 2622-2628, 2008. (Summary) The locational and orientational structure and the dynamics of cholesterol in the bilayer membrane were studied by using the solution-state NMR. The intermolecular nuclear Overhauser effect (NOE) was analyzed for large unilamellar vesicles (100 nm in diameter) composed of dimyristoylphosphatidylcholine (DMPC) and cholesterol at cholesterol concentrations of 9-33 mol %. The DMPC headgroups show (1)H-{(1)H}-NOEs with the methyl groups at the hydrophobic terminals of both cholesterol and DMPC, illustrating the significant fluctuation of the bilayer membrane in the vertical (bilayer normal) direction. Cholesterol was found to keep the hydroxyl (OH) group toward the outer water pool on the basis of the following observations: (1) the cross correlation between the DMPC headgroup and the cholesterol terminal methyl group is weaker than those between the DMPC headgroups and (2) the methyl group at the hydrophobic terminal of cholesterol shows strong correlation with the terminal group of the DMPC chain portion. The OH group plays a crucial role in orienting cholesterol with its OH group outward, since cholestane, which has a molecular structure similar to that of cholesterol except for the absence of the OH group, was found to have no orientational preference in the bilayer membrane. The dynamic slowdown at high cholesterol concentrations is demonstrated on the basis of the correlation times for NOE as well as the broadening of the proton linewidths. (Keyword) Cholestanes / Cholesterol / Dimyristoylphosphatidylcholine / Hydrophobic and Hydrophilic Interactions / Magnetic Resonance Spectroscopy / Membrane Fluidity / Models, Molecular / Phospholipids / Unilamellar Liposomes / Water (Link to Publication Site) ● Publication site (DOI): 10.1021/jp0760713 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 18257564 ● Summary page in Scopus @ Elsevier: 2-s2.0-41549138448 (DOI: 10.1021/jp0760713, PubMed: 18257564, Elsevier: Scopus)
23.	Ken Yoshida, Nobuyuki Matubayasi and Masaru Nakahara : Solvation shell dynamics studied by molecular dynamics simulation in relation to the translational and rotational dynamics of supercritical water and benzene, The Journal of Chemical Physics, Vol.127, No.17, 174509, 2007. (Summary) The solvation shell dynamics of supercritical water is analyzed by molecular dynamics simulation with emphasis on its relationship to the translational and rotational dynamics. The relaxation times of the solvation number (tau S), the velocity autocorrelation function (tau D), the angular momentum correlation function (tau J), and the second-order reorientational correlation function (tau 2R) are studied at a supercritical temperature of 400 degrees C over a wide density region of 0.01-1.5 g cm(-3). The relaxation times are decomposed into those conditioned by the solvation number n, and the effect of the short-ranged structure is examined in terms of its probability Pn of occurrence. In the low to medium-density range of 0.01-0.4 g cm(-3), the time scales of water dynamics are in the following sequence: tau D>tau S approximately or > tau J approximately or > tau 2R. This means that the rotation in supercritical water is of the "in-shell" type while the translational diffusion is not. The comparison to supercritical benzene is also performed and the effect of hydrogen bonding is examined. The water diffusion is not of the in-shell type up to the ambient density of 1.0 g cm(-3), which corresponds to the absence of the transition from the collision to the Brownian picture, whereas such transition is present in the case of benzene. The absence of the transition in water comes from the fast reorganization of the hydrogen bonds and the enhanced mobility of the solvation shell in supercritical conditions. (Link to Publication Site) ● Publication site (DOI): 10.1063/1.2780871 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 17994829 ● Summary page in Scopus @ Elsevier: 2-s2.0-35948981122 (DOI: 10.1063/1.2780871, PubMed: 17994829, Elsevier: Scopus)
24.	Yoshiro Yasaka, Ken Yoshida, Chihiro Wakai, Nobuyuki Matubayasi and Masaru Nakahara : Kinetic and Equilibrium Study on Formic Acid Decomposition in Relation to the Water-Gas-Shift Reaction, The Journal of Physical Chemistry A, Vol.110, No.38, 11082-11090, 2006. (Summary) Kinetics and equilibrium are studied on the hydrothermal decarbonylation and decarboxylation of formic acid, the intermediate of the water-gas-shift (WGS) reaction, in hot water at temperatures of 170-330 degrees C, to understand and control the hydrothermal WGS reaction. (1)H and (13)C NMR spectroscopy is applied to analyze as a function of time the quenched reaction mixtures in both the liquid and gas phases. Only the decarbonylation is catalyzed by HCl, and the reaction is first-order with respect to both [H(+)] and [HCOOH]. Consequently, the reaction without HCl is first and a half (1.5) order due to the unsuppressed ionization of formic acid. The HCl-accelerated decarbonylation path can thus be separated in time from the decarboxylation. The rate and equilibrium constants for the decarbonylation are determined separately by using the Henry constant (gas solubility data) for carbon monoxide in hot water. The rate constant for the decarbonylation is 1.5 x 10(-5), 2.0 x 10(-4), 3.7 x 10(-3), and 6.3 x 10(-2) mol(-1) kg s(-1), respectively, at 170, 200, 240, and 280 degrees C on the liquid branch of the saturation curve. The Arrhenius plot of the decarbonylation is linear and gives the activation energy as 146 +/- 3 kJ mol(-1). The equilibrium constant K(CO) = [CO]/[HCOOH] is 0.15, 0.33, 0.80, and 4.2, respectively, at 170, 200, 240, and 280 degrees C. The van't Hoff plot results in the enthalpy change of DeltaH = 58 +/- 6 kJ mol(-1). The decarboxylation rate is also measured at 240-330 degrees C in both acidic and basic conditions. The rate is weakly dependent on the solution pH and is of the order of 10(-4) mol kg(-1) s(-1) at 330 degrees C. Furthermore, the equilibrium constant K(CO2) = [CO(2)][H(2)]/[HCOOH] is estimated to be 1.0 x10(2) mol kg(-1) at 330 degrees C. (Link to Publication Site) ● Publication site (DOI): 10.1021/jp0626768 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 16986841 ● Search Scopus @ Elsevier (PMID): 16986841 ● Search Scopus @ Elsevier (DOI): 10.1021/jp0626768 (DOI: 10.1021/jp0626768, PubMed: 16986841)
25.	Ken Yoshida, Nobuyuki Matubayasi and Masaru Nakahara : Self-diffusion of supercritical water in extremely low-density region, The Journal of Chemical Physics, Vol.125, No.7, 074307, 2006. (Summary) The self-diffusion coefficient D for super- and subcritical water is determined by using the proton pulsed-field-gradient spin echo method at high temperatures and low densities. The density of water is ranged in the steamlike region from 0.0041 to 0.0564 g [corrected] cm(-3) at a supercritical temperature of 400 degrees C, also at 0.0041-0.0079 and 0.0041-0.0462 g [corrected] cm(-3) (the steam-branch densities on the coexistence curve and lower) at 200 and 300 degrees C, respectively. The density is precisely determined on the basis of the PVT dependence of the proton chemical shift. The density-diffusivity products in the zero-density limit divided by the square root of the temperature, (rho D)0/square root of T, are 0.94, 1.17, and 1.35 mg m(-1) s(-1) K(-1/2) (mg=10(-3)g) [corrected] at 200, 300, and 400 degrees C, respectively. The (rhoD)0/square root of T obtained decreases with decreasing temperature and is significantly smaller than the temperature-independent value from the hard sphere model, 1.95 mg [corrected] m(-1) s(-1) K(-1/2). The marked temperature dependence reflects the presence of the strong attractive interaction between a pair of water molecules. The magnitude of the experimental D values and the temperature dependence are well reproduced by the molecular dynamics simulation using TIP4P-FQ model. The initial slope of the product rhoD/square root of T against rho is slightly negative at 300 and 400 [corrected] degrees C. (Link to Publication Site) ● Publication site (DOI): 10.1063/1.2333511 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 16942339 ● Search Scopus @ Elsevier (PMID): 16942339 ● Search Scopus @ Elsevier (DOI): 10.1063/1.2333511 (DOI: 10.1063/1.2333511, PubMed: 16942339)
26.	Tomoyuki Tajima, Takahiro Sasamori, Nobuhiro Takeda, Norihiro Tokitoh, Ken Yoshida and Masaru Nakahara : Synthesis of Bis(germacyclopropa)benzenes and Structures of Their Annelated Benzene Rings, Organometallics, Vol.25, No.1, 230-235, 2005. (Link to Publication Site) ● Publication site (DOI): 10.1021/om0507629 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1021/om0507629 (DOI: 10.1021/om0507629)
27.	Ken Yoshida, Chihiro Wakai, Nobuyuki Matubayasi and Masaru Nakahara : A new high-temperature multinuclear-magnetic-resonance probe and the self-diffusion of light and heavy water in sub- and supercritical conditions, The Journal of Chemical Physics, Vol.123, No.16, 164506, 2005. (Summary) A high-resolution nuclear-magnetic-resonance probe (500 MHz for 1H) has been developed for multinuclear pulsed-field-gradient spin-echo diffusion measurements at high temperatures up to 400 degrees C. The convection effect on the self-diffusion measurement is minimized by achieving the homogeneous temperature distributions of +/-1 and +/-2 degrees C, respectively, at 250 and 400 degrees C. The high temperature homogeneity is attained by using the solid-state heating system composed of a ceramic (AlN) with high thermal conductivity comparable with that of metal aluminium. The self-diffusion coefficients D for light (1H2O) and heavy (2H2O) water are distinguishably measured at subcritical temperatures of 30-350 degrees C with intervals of 10-25 degrees C on the liquid-vapor coexisting curve and at a supercritical temperature of 400 degrees C as a function of water density between 0.071 and 0.251 gcm3. The D value obtained for 1H2O is 10%-20% smaller than those previously reported because of the absence of the convection effect. At 400 degrees C, the D value for 1H2O is increased by a factor of 3.7 as the water density is reduced from 0.251 to 0.071 gcm3. The isotope ratio D(1H2O)D(2H2O) decreases from 1.23 to approximately 1.0 as the temperature increases from 30 to 400 degrees C. The linear hydrodynamic relationship between the self-diffusion coefficient divided by the temperature and the inverse viscosity does not hold. The effective hydrodynamic radius of water is not constant but increases with the temperature elevation in subcritical water. (Link to Publication Site) ● Publication site (DOI): 10.1063/1.2056542 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 16268711 ● Search Scopus @ Elsevier (PMID): 16268711 ● Search Scopus @ Elsevier (DOI): 10.1063/1.2056542 (DOI: 10.1063/1.2056542, PubMed: 16268711)
28.	Ken Yoshida, Chihiro Wakai, Nobuyuki Matubayasi and Masaru Nakahara : NMR Spectroscopic Evidence for an Intermediate of Formic Acid in the Water-Gas-Shift Reaction, The Journal of Physical Chemistry A, Vol.108, No.37, 7479-7482, 2004. (Link to Publication Site) ● Publication site (DOI): 10.1021/jp047086t (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1021/jp047086t (DOI: 10.1021/jp047086t)
29.	Chihiro Wakai, Ken Yoshida, Yasuo Tsujino, Nobuyuki Matubayasi and Masaru Nakahara : Effect of Concentration, Acid, Temperature, and Metal on Competitive Reaction Pathways for Decarbonylation of Formic Acid in Hot Water, Chemistry Letters, Vol.33, No.5, 572-573, 2004. (Link to Publication Site) ● Publication site (DOI): 10.1246/cl.2004.572 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1360565169063911040 ● Search Scopus @ Elsevier (DOI): 10.1246/cl.2004.572 (DOI: 10.1246/cl.2004.572, CiNii: 1360565169063911040)

Review, Commentary:

1.	Ken Yoshida and : Structure and Formation Mechanism of Protective Coatings on Steam Piping Composed of Film-Forming Amines, The Thermal and Nuclear Power, Vol.73, No.7, 32-39, Jul. 2022. (Summary) 皮膜形成アミンは，金属表面に疎水性膜を形成することで水-蒸気サイクルの腐食防止に高い効果を発揮する新規な添加剤として近年世界的に注目を集めている．しかし，その最も重要な作用機構は未知であった．筆者らは，最近，溶液中の分子解析に強力なNMRとICP-AESによる定量分析と界面の構造解析に強力な方法論としての顕微反射IR，XPS，AFMによる表面分析を相補的に融合した新規なアプローチにより，アミン分子の金属表面への会合体形成機構と皮膜の構造を世界に先駆けて解明したので紹介する．多核NMR による高温水中でのアミンの分解反応の解析についても紹介する． (Tokushima University Institutional Repository) ● Metadata: 117235 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1050011461883558656 (Tokushima University Institutional Repository: 117235, CiNii: 1050011461883558656)
2.	Ken Yoshida, Nobuyuki Matubayasi, Masaru Nakahara and Yasuhiro Uosaki : Effect of Rotation on Vibrational Spectrum of Supercritical Water: Analysis of Dependencies on Density and Hydrogen Isotopes, The Review of High Pressure Science and Technology, Vol.26, No.4, 323-332, Dec. 2016. (Summary) In this article, we review the recent advances made in our group in the analysis of the line shape of the vibrational spectra in supercritical water. The vibrational dynamics of water in supercritical states has been examined by means of the classical MD simulation by paying particular attention to the relation to the rotational dynamics. Through the analysis of the effects of the water density and the isotopes of hydrogen, we revealed that the rotational couplings are the dominant determining factors of the line shape of the OH vibrational spectrum in supercritical water. (Keyword) supercritical water / infrared spectrum / MD simulation / rotational dynamics / hydrogen bonding (Link to Publication Site) ● Publication site (DOI): 10.4131/jshpreview.26.323 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.4131/jshpreview.26.323 (DOI: 10.4131/jshpreview.26.323)
3.	Ken Yoshida : 超臨界水中の伸縮振動の分子描像 ──振動スペクトル波形を決める動的な起源の解明, Chemistry & Chemical Industry, Vol.67, No.3, 250-251, Mar. 2014.
4.	Ken Yoshida and Yasuhiro Uosaki : 鉄で水素を貯蔵する-水素の「化学タンク」となるギ酸の合成, 化学, Vol.68, No.10, 63-64, Oct. 2013.
5.	Ken Yoshida : Development of High-Pressure High-Temperature NMR Probe and Dynamics, Structure and Reactions in Supercritical Water, The Review of High Pressure Science and Technology, Vol.22, No.2, 153-163, May 2012. (Summary) The present review introduces our recent studies of the title subjects that have led to the JSHPST Award for Young Scientists, 2011. We studied the structure, dynamics, and reactions in water under high-pressure and high-temperature conditions using NMR and computational methods. The NMR apparatus was newly developed and was applied for the self-diffusion measurements of water and nonpolar organic fluids over a wide range of pressure and temperature. Molecular dynamics simulation combined with a new analysis scheme provided new insights into the translational dynamics in the supercritical water in the medium-density region in relation to the structure and lifetime of the solvation shell. (Keyword) supercritical water / NMR spectroscopy / self-diffusion / molecular dynamics simulation / hydrogen bonding / hydrothermal reactions (Link to Publication Site) ● Publication site (DOI): 10.4131/jshpreview.22.153 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1390001204381047296 ● Search Scopus @ Elsevier (DOI): 10.4131/jshpreview.22.153 (DOI: 10.4131/jshpreview.22.153, CiNii: 1390001204381047296)
6.	中原勝, 辻野康夫, 八坂能郎, Ken Yoshida, Yasuhiro Uosaki, 若井千尋 and 松林伸幸 : Recent Advances in Studies on Organic Reactions in Water at High Temperatures and High Pressures, The Review of High Pressure Science and Technology, Vol.20, No.1, 40-49, Feb. 2010. (Summary) Chemical reactions in super- and subcritical water have been studied in our group over the decades, and recent advances are reviewed. The reaction mechanism in hydrothermal conditions is disclosed for ether and aldehyde in general form, and a new type of C-C bond formation is discovered in connection to the chemical evolution on primitive earth. Toward a new-generation hydrogen-fuel technology, it is proposed on the basis of physico-chemical reaction properties of formic acid that formic acid acts as a chemical tank for hydrogen storage and transportation. The hot-water chemistry is further discussed in the contexts of energy and environmental concerns, and its role in establishing green chemistry is stressed. (Keyword) supercritical water / chemical reaction / C1 chemistry / C-C bond formation / water-gas-shift reaction / formic acid / hydrogen cycle / dechlorination / NMR spectroscopy (Link to Publication Site) ● Publication site (DOI): 10.4131/jshpreview.20.40 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1390001204381359616 ● Search Scopus @ Elsevier (DOI): 10.4131/jshpreview.20.40 (DOI: 10.4131/jshpreview.20.40, CiNii: 1390001204381359616)
7.	Ken Yoshida : 動的溶媒和殻モデルによる超臨界流体中の並進ダイナミクスの解析, 分子シミュレーション研究会誌アンサンブル, Vol.12, No.1, 79-84, Jan. 2010. (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1390282680340606080 (CiNii: 1390282680340606080)
8.	Ken Yoshida, Nobuyuki Matsubayashi, Masaru Nakahara, Takeyoshi Ikeda and Takahiro Anai : A new high-temperature multinuclear-magnetic-resonance probe for structure, dynamics, and reaction in supercritical water, JEOL NEWS, Vol.42, No.1, 16-20, Jul. 2007.
9.	Ken Yoshida, Nobuyuki Matsubayashi and Masaru Nakahara : New Method for Precise Measurement of Density of Supercritical Fluid over a Wide Range of Pressure, The Review of High Pressure Science and Technology, Vol.16, No.4, 379-380, Jan. 2007. (Summary) We have developed two methods to determine the density of supercritical fluid sealed in a tube. One is the mass-volume method that is applicable to higher densities than 0.07 g cm-3 at 400°C when the fluid is water. In this method, the mass of the sample and the bore volume of the tube are determined precisely. The other is the chemical shift method, which takes advantage of the temperature dependence of the chemical shift and the PVT data. The latter is especially powerful at lower densities. (Keyword) supercritical water / density / mass-volume method / chemical shift method / NMR / sealed-tube method / equation of state / self-diffusion (Link to Publication Site) ● Publication site (DOI): 10.4131/jshpreview.16.379 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1390282679358044544 ● Summary page in Scopus @ Elsevier: 2-s2.0-33846276533 (DOI: 10.4131/jshpreview.16.379, CiNii: 1390282679358044544, Elsevier: Scopus)
10.	Ken Yoshida, Nobuyuki Matsubayashi, Masaru Nakahara, Takeyoshi Ikeda and Takahiro Anai : 高温多核拡散NMRプローブの開発と超臨界水中のダイナミクスの解析, 日本電子ニュース, Vol.39, 2-7, 2007.

Proceeding of International Conference:

1.	Ken Yoshida, Shinnosuke Suhara and Naoki Noguchi : The Significance of Cage Occupancy on C-H Stretching Vibrations of Methane in Structure H Clathrate Hydrate using Ab Initio Molecular Dynamics Simulations, The 10th International Conference on Advanced Materials Development and Performance 2024 (AMDP 2024), Tokushima, Sep. 2024.
2.	Rika Shibahara, Ken Yoshida, Reo Tsugita, Tomoyuki Ueki, Naoki Noguchi, Hitoshi Mizuguchi, Chi Cheng-Yu and Tai Yian : Formation Processand Structure of Protective Filmon Copper from Dilute Aqueous Solutions of Aliphatic Amine Corrosion Inhibitors, The 10th International Conference on Advanced Materials Development and Performance 2024 (AMDP 2024), Tokushima, Sep. 2024.
3.	Minori Takasugi, Ken Yoshida and Naoki Noguchi : Evaluation of the Corrosion Inhibiti on Effect of Film-Forming Amineson Iron Surfaces, The 10th International Conference on Advanced Materials Development and Performance 2024 (AMDP 2024), Tokushima, Sep. 2024.
4.	Nobuo Okita, Kenichi Kimura, Ryo Akasaka and Ken Yoshida : Sulfuric Acid Dew Point for Gas Turbine Combined Cycle Power Plants, Twenty-Second Symposium on Thermophysical Properties and Eighteenth International Conference on the Properties of Water and Steam, Boulder, Jun. 2024.
5.	Ken Yoshida : Microscopic Investigations Towards the Practical Implementation of Film Forming Amines as Corrosion Inhibitors in High-Temperature Aqueous Systems, Twenty-Second Symposium on Thermophysical Properties and Eighteenth International Conference on the Properties of Water and Steam, Boulder, Jun. 2024.
6.	Ken Yoshida, Rika Shibahara, Reo Tsugita, Tomoyuki Ueki, Naoki Noguchi, Hitoshi Mizuguchi, Cheng-Yu Chi and Yian Tai : Analysis of Film Formation Process of Aliphatic Amine Corrosion Inhibitor on Copper Surface from Low Concentration Aqueous Solution, The 10th International Forum on Advanced Technologies 2024 (IFAT 2024), Tokushima, Mar. 2024.
7.	Ken Yoshida, Ayato Doi, Haruka Yoshioka, Tomohiro Hirano and Masaru Nakahara : Hydrothermal Reactions of Alkylamines in Sub- and Supercritical Water Studied by NMR Spectroscopy, 8th International Solvothermal and Hydrothermal Association Conference, Valladolid, Spain, Sep. 2023.
8.	Masaru Nakahara and Ken Yoshida : Comparison of experimental and calculated ionization constants for subcritical/supercritical water, 2023 IAPWS Annual Meeting, Turin, Sep. 2023.
9.	Ken Yoshida : Reaction pathways and mechanisms of alkylamines in supercritical water as studied by NMR spectroscopy, 2023 IAPWS Annual Meeting, Turin, Sep. 2023.
10.	Ken Yoshida : Structure, Formation Mechanism, and Reaction of Film-Forming Amines for Anticorrosion Protection for Steam Piping, 9th International Discussion on Relaxations in Complex Sysytems, Makuhari, Aug. 2023.
11.	Ken Yoshida : Formation Mechanism and Microscopic Structure of Corrosion Protective Coating for Steam Piping by Film-Forming Amine, 2022 IAPWS Annual Meeting, Rotorua, New Zealand, Dec. 2022.
12.	Ken Yoshida : Adsorption and Film-Formation of Corrosion-Protective Aliphatic Amines on Metal Surface in Hot Water, 1st International Solvothermal and Hydrothermal Association Seminar, Online, Apr. 2022.
13.	Ken Yoshida : Stability and reactivity of film-forming amines in supercritical water: 14N NMR study on model alkylamines, 2021 IAPWS PCAS Symposium, Online, Aug. 2021.
14.	Ken Yoshida : Report on progress toward IAPWS Guideline on diffusivity of ordinary water, IAPWS Annual Meeting 2019, Banff, Oct. 2019.
15.	Ken Yoshida and Masaru Nakahara : Self-diffusion of water and cyclohexane in supercritical mixture studied by NMR and MD, Joint Conference of EMLG/JMLG Meeting 2018 and 41st Symposium on Solution Chemistry of Japan, Nagoya, Nov. 2018.
16.	Ken Yoshida and Masaru Nakahara : High-Temperature NMR and MD study on self-diffusion coefficients of water and cyclohexane in binary mixture in supercritical states, 17th International Conference on the Properties of Water and Steam, Praha, Sep. 2018.
17.	Ken Yoshida, Yasuo Tsujino and Masaru Nakahara : Unimolecular pyrolysis of dimethyl ether: Elementary fragmentation into methane and formaldehyde evidenced by gas 1H NMR, 17th International Conference on the Properties of Water and Steam, Praha, Sep. 2018.
18.	Ken Yoshida : Progress in the development of a guideline on self-diffusion coefficients of sub- and Supercritical Water, IAPWS Annual Meeting 2018, Praha, Sep. 2018.
19.	Ken Yoshida : Self-Diffusion Coefficients of Sub- and Supercritical Water: Available Data, Reliable Fitting Functions, and Effects of Temperature and Density, IAPWS Annual Meeting 2017, Kyoto, Aug. 2017.
20.	Ken Yoshida, Nobuyuki Matubayasi, Masaru Nakahara and Yasuhiro Uosaki : NMR and MD studies on dynamics in sub- and supercritical water and application to conversion of renewable resources, Joint EMLG/JMLG Annual Meeting 2016, Chania, Sep. 2016.
21.	Ken Yoshida : Recent research trends in the conversion of carbohydrate biomass into value-added compounds in aqueous solutions, IAPWS Annual Meeting 2015, Stockholm, Jun. 2015.
22.	Ken Yoshida, Hiroshi Kimura, Masaki Hirayama, Yasuhiro Uosaki and Masaru Nakahara : Hydrothermal Cleavage of Glycosidic Bonds in Biomass for Valuable Chemicals and Fuels, The 15th IUMRS-International Conference in Asia, Fukuoka, Aug. 2014.
23.	Ken Yoshida : Self-diffusion in supercritical water: NMR and MD studies on dynamics of hydrogen bonds, IAPWS Annual Meeting 2014, Moscow, Jun. 2014.
24.	Masaru Nakahara, Ken Yoshida, Hiroshi Kimura and Yasuhiro Uosaki : Hydrothermal Chemical Reactions in Biomass, IAPWS Annual Meeting 2014, Moscow, Jun. 2014.
25.	Satoshi Kubota, Toshihide Horikawa, Ken-Ichiro Sotowa and Ken Yoshida : Phase Transfer Mechanism of TiO2 nanoparticles by NMR diffusometry, Chemeca2013, Brisbane, Sep. 2013.
26.	Ken Yoshida, Nobuyuki Matubayasi, Yasuhiro Uosaki and Masaru Nakahara : INFRARED SPECTRUM LINE SHAPE FOR SUPERCRITICAL WATER STUDIED BY MOLECULAR DYNAMICS SIMULATION: THE EFFECT OF THE ROTATIONAL COUPLINGS, 16th International Conference on the Properties of Water and Steam, Sep. 2013.
27.	Ken Yoshida, Masashi Katanazaka, Hiroshi Kimura, Yasuhiro Uosaki and Masaru Nakahara : HIGH-PURITY HYDORGEN PRODUCTION FROM FORMIC ACID USING ZINC (II) CATION AS HOMOGENEOUS CATALYST, 16th International Conference on the Properties of Water and Steam, Sep. 2013.
28.	Ken Yoshida, Nobuyuki Matubayasi, Yasuhiro Uosaki and Masaru Nakahara : Vibrational Spectrum Line Shape for Supercritical Water: Effect of Rotational Couplings on Density, Temperature, and Hydrogen Isotopes Dependencies, 33rd International Conference on Solution Chemistry, Kyoto, Jul. 2013.
29.	Ogo Hiroyuki, Ken Yoshida and Yasuhiro Uosaki : Supercritical Impregnation of Azobenzene into ARTON^® Film, Book of Abstracts of 49^th EHPRG Conference, 241-242, Budapest, Sep. 2011. (Keyword) impregnation / azobenzene / polymer / supercritical
30.	Masaru Nakahara, Ken Yoshida, Yoshiro Yasaka, Yasuo Tsujino, Chihiro Wakai and Nobuyuki Matubayasi : Hydrothermal Chemistry of Formic Acid and a New Scheme of Hydrogen Technology, Joint AIRAPT-22 & HPCJ-50, Tokyo, Jul. 2009.
31.	Ken Yoshida, Nobuyuki Matubayasi, Yasuhiro Uosaki and Masaru Nakahara : Self-Diffusion for Water and Organic Solvents in Sub- and Supercritical Conditions Studied by High-Temperature NMR method, Joint AIRAPT-22 & HPCJ-50, Tokyo, Jul. 2009.
32.	Takeyoshi Ikeda, Takahiro Anai, Ken Yoshida, Nobuyuki Matubayasi and Masaru Nakahara : Structure, Dynamics, Chemical Reactions in Supercritical Water, 15th International Conference on the Properties of Water and Steam, Berlin, Sep. 2008.
33.	Yoshiro Yasaka, Ken Yoshida, Chihiro Wakai, Nobuyuki Matubayasi and Masaru Nakahara : Kinetics and Equilibrium of the Reversible Formic Acid Decomposition in Hot Water, The 15th International Conference on the Properties of Water and Steam, Berlin, Sep. 2008.
34.	Nobuyuki Matubayasi, Ken Yoshida and Masaru Nakahara : Diffusion Dynamics of Supercritical Water Studied by NMR and MD, The 15th International Conference on the Properties of Water and Steam, Berlin, Sep. 2008.
35.	Yoshimichi Ando, Noriyuki Yoshii, Ken Yoshida, Nobuyuki Matubayasi, Masaru Nakahara and Susumu Okazaki : Molecular dynamics study on molecular origin of 1H-NMR spectrum of cholesterol in lipid bilayer, The 15th International Conference on the Properties of Water and Steam, Berlin, Sep. 2008.
36.	Yoshimichi Ando, Noriyuki Yoshii, Ken Yoshida, Nobuyuki Matubayasi, Masaru Nakahara and Susumu Okazaki : Molecular dynamics study on molecular origin of 1H-NMR spectrum of cholesterol in lipid bilayer, EMLG/JMLG Annual Meeting 2008, Lisbon, Sep. 2008.
37.	Yoshimichi Ando, Noriyuki Yoshii, Ken Yoshida, Nobuyuki Matubayasi, Masaru Nakahara and Susumu Okazaki : Molecular dynamics study on molecular origin of 1H-NMR spectrum of cholesterol in lipid bilayer, The 1st International Conference of the Grand Challenge to Next-Generation Integrated Nanoscience, Tokyo, Jun. 2008.
38.	Ken Yoshida, Megumi Shintani, Nobuyuki Matubayashi and Masaru Nakahara : NMR NOE Study on Vertical Fluctuation and Orientational Relaxation of Intermolecular Correlation in Lipid Bilayer, Joint Conference of JMLG/EMLG Meeting 2007 and 30th Symposium on Solution Chemistry of Japan, Fukuoka, Nov. 2007.
39.	Ken Yoshida, Nobuyuki Matubayasi and Masaru Nakahara : Self-diffusion and rotation in supercritical water and benzene and their dependencies on the solvation shell state and lifetime, Joint Conference of JMLG/EMLG Meeting 2007 and 30th Symposium on Solution Chemistry of Japan, Fukuoka, Nov. 2007.
40.	Ken Yoshida, Chihiro Wakai, Nobuyuki Matubayashi and Masaru Nakahara : Generation and Storage of Hydrogen in Formic Acid Intermediate of the Water-Gas-Shift Reaction Pacifichem 2005, アメリカ合衆国ハワイ州ホノルル, Dec. 2005.
41.	Ken Yoshida, Chihiro Wakai, Nobuyuki Matubayashi and Masaru Nakahara : HIGH-TEMPERATURE NMR STUDY OF DIFFUSION DYNAMICS OF WATER AND AN ION IN HYDROTHERMAL AND SUPERCRITICAL CONDITIONS 14th International Conference on the Properties of Water and Steam, 京都, Aug. 2004.

Proceeding of Domestic Conference:

1.	玉越麗奈, 西村仁志, 竹田大登, Ryo Kawatani, Kohei Torii, Ken Yoshida, Hitoshi Mizuguchi and Tomohiro Hirano : ジアクリレートとスチレンとのラジカル共重合で合成したゲルの構造解析, 第73回高分子討論会, Sep. 2024.
2.	西村仁志, Ryo Kawatani, Kohei Torii, Ken Yoshida, Hitoshi Mizuguchi and Tomohiro Hirano : 1H NMRスペクトルの多変量解析によるアクリル酸メチル/スチレン共重合体の統計的連鎖解析, 第73回高分子討論会, Sep. 2024.
3.	西村仁志, Ryo Kawatani, Kohei Torii, Ken Yoshida, Hitoshi Mizuguchi and Tomohiro Hirano : 1H NMRスペクトルの多変量解析によるアクリル酸メチル/スチレン共重合体の連鎖解析, 第70回高分子研究発表会(神戸)・70周年記念講演会, Jul. 2024.
4.	SHINNOSUKE Suhara, Ken Yoshida and Naoki Noguchi : H型メタンハイドレートのLLケージ内のメタンの振動スペクトルの第一原理MD解析, 水・蒸気性質シンポジウム2023, Nov. 2023.
5.	REO Tsugita, Ikumi Kinoshita, Rika Shibahara, Tomoyuki Ueki, Naoki Noguchi and Ken Yoshida : 皮膜形成アミンの銅への吸着および腐食防止に対する温度効果, 水・蒸気性質シンポジウム2023, Nov. 2023.
6.	AYATO Doi, Ken Yoshida, Haruka Yoshioka, Tomohiro Hirano and 中原勝 : アルキルアミンの水熱反応:皮膜形成アミン適用のための生成物と経路のNMR解析, 水・蒸気性質シンポジウム2023, Nov. 2023.
7.	AYATO Doi, Ken Yoshida, Haruka Yoshioka, Tomohiro Hirano and 中原勝 : NMR analysis of reactions of ethylamine and octylamine in sub- and supercritical water, 第45回溶液化学シンポジウム, Oct. 2023.
8.	SHINNOSUKE Suhara, Ken Yoshida and Naoki Noguchi : C-H Stretching Vibration of Methane in LL Cage of Structure H Hydrate as studied by Ab initio Molecular Dynamics Simulation, 第45回溶液化学シンポジウム, Oct. 2023.
9.	REO Tsugita, Ikumi Kinoshita, Rika Shibahara, Tomoyuki Ueki, Naoki Noguchi and Ken Yoshida : Effect of Temperature on the Structure and Formation of an Aliphatic Amine Corrosion Inhibiting Film on Metals, 第45回溶液化学シンポジウム, Oct. 2023.
10.	Ken Yoshida : Microscopic heterogeneous structures, reactions, and functions of water and hydrophobic organic molecules in solutions and at interfaces, 第45回溶液化学シンポジウム・プレシンポジウム, Oct. 2023.
11.	Ken Yoshida and 中原勝 : Comparison of experimental and calculated ionization constants for subcritical/supercritical water, 日本水・蒸気性質協会 2023年度第2回全体会議, Jul. 2023.
12.	Ken Yoshida : NMR analysis of hydrothermal reactions of ethylamine and octylamine, 日本水・蒸気性質協会 2023年度第2回全体会議, Jul. 2023.
13.	Ken Yoshida, Haruka Yoshioka, Naoki Noguchi, Tomoyuki Ueki, Kei-ichiro Murai, Kazuya Watanabe and 中原勝 : Formation Mechanism and Microstructure of Corrosion Protection Coating on Steam Piping by Film-Forming Amine, 44th Symposium on Solution Chemistry of Japan, Oct. 2022.
14.	Ken Yoshida : Research Trends and Issues Concerning Film-Forming Amines, 2nd General Meetings 2022, The Japan Association for the Properties of Water and Steam, Oct. 2022.
15.	Ken Yoshida : 亜臨界・超臨界水溶液中で水と疎水性有機分子の織りなす微視的不均一構造・ダイナミクス・機能, 日本セラミックス協会第35回秋季シンポジウム, Sep. 2022.
16.	Haruka Yoshioka and Ken Yoshida : 14N NMR analysis of initial process of hydrothermal decomposition of alkylamines in supercritical water, The 1st Winter Meeting of the Japan Association of Solution Chemistry for Young Scientists, Dec. 2021.
17.	Ken Yoshida and Haruka Yoshioka : Effect of structure and lifetime of solvation shell on translational diffusion and rotation of water-organic solvent mixtures under supercritical conditions, 43rd Symposium on Solution Chemistry of Japan, Oct. 2021.
18.	Koichi Ute, 秋元隆史, 石田明子, Akinobu Imoto, 漆原紅, 大磯佑介, Tomohiko Kuwabara, 古賀慎一朗, 芝谷治美, 原優月, Tomohiro Hirano, 高松京祐, 牧野麗子, 松川隆幸, 松下宏幸 and Ken Yoshida : 標準ポリマー混合サンプルの DOSY 共通測定, 第26回高分子分析討論会, Oct. 2021.
19.	岡本実来, Toshihide Horikawa and Ken Yoshida : 二価金属イオンの炭素細孔内吸着ダイナミクス, 化学工学会広島大会2020, 11, Dec. 2020.
20.	Ken Yoshida : Analysis of Structure and Dynamics of Diffusion and Solvation in Supercritical Aqueous Solution, CSJ West Japan Chemistry Forum 2020 in Shimane, Nov. 2020.
21.	Ken Yoshida and Masaru Nakahara : Analysis of Translational Diffusion in Binary Mixture of Water and Cyclohexane in Supercritical States Studied by Using High-Temperature NMR and MD, CSJ West Japan Chemistry Forum 2019 in Tokushima, Nov. 2019.
22.	Ken Yoshida and Masaru Nakahara : High-Temperature NMR and MD Analysis of Effect of Hydrogen Bonding on Self-Diffusion of Water and Cyclohexane in Binary Mixture in Supercritical States, 42nd Symposium on Solution Chemistry of Japan, Oct. 2019.
23.	池北尚人, Ken Yoshida, Tomohiro Hirano and Koichi Ute : Pure Shift NMRを用いたポリ(N-ビニルピロリドン)の構造解析, 第67回高分子討論会, Sep. 2018.
24.	Ken Yoshida : MD and NMR studies on dynamics in supercritical water, SCEJ 48th Autumn Meeting, Sep. 2016.
25.	Ken Yoshida : Dynamics in High-Temperature High-Pressure Water: Molecular Picture of Translation, Rotation and Vibration, 九重分子科学セミナー2016, Sep. 2016.
26.	Masahiko Akiyama, Satoshi Kubota, Toshihide Horikawa, Ken Yoshida, Ken-Ichiro Sotowa and Jesus Rafael Alcantara Avila : ポーラスカーボンへの液相吸着における吸着質分子のNMRによる動的挙動観察, 第29回日本吸着学会研究発表会, Nov. 2015.
27.	Yoshihiro Maeda, Ken Yoshida, Hiroshi Kimura, Masaru Nakahara and Yasuhiro Uosaki : Effect of water concentration on decomposition of amylose in DMSO-water binary mixture studied by using 13C NMR analysis, 38th Symposium on Solution Chemistry of Japan, Oct. 2015.
28.	Ken Yoshida : Analysis of Reactions and Dynamics in Water and Aqueous Solutions at High Temperatures Studied by In-Situ NMR Method, 82th Annual Meeting of the Electrochemical Society of Japan, Mar. 2015.
29.	天野真也, 宮本裕也, 木村浩, Ken Yoshida, Miyuki Oshimura, Tomohiro Hirano and Koichi Ute : 高温NMRによるポリビニルピロリドンの構造解析, 第55回高圧討論会, Nov. 2014.
30.	Masaki Hirayama, Ken Yoshida, Hiroshi Kimura, Yasuhiro Uosaki and Masaru Nakahara : Kinetic analysis of the selective elimination of the anomeric-terminal units in hydrothermal decomposition of the oligosaccharide, The 55th High Pressure Conference of Japan, Nov. 2014.
31.	Ken Yoshida, Masaki Hirayama, Hiroshi Kimura, Yasuhiro Uosaki and Masaru Nakahara : In-situ NMR analysis of the glycosidic bond cleavage of cellobiose and hydrothermal conversion into 5-HMF, The 55th High Pressure Conference of Japan, Nov. 2014.
32.	Yasuhiro Uosaki, Tomomi Saiki and Ken Yoshida : Fusion Behavior of Menthols in Compressed Carbon Dioxide, The 55th High Pressure Conference of Japan, Nov. 2014.
33.	Ken Yoshida : Dynamics in Supercritical Water Studied by Using High-Temperature NMR and Application to Utilization of Sustainable Resources, 37th Symposium on Solution Chemistry of Japan, Nov. 2014.
34.	天野真也, 宮本裕也, Miyuki Oshimura, 内田哲也, Ken Yoshida, Tomohiro Hirano and Koichi Ute : 立体規則性の規制されたポリ(1-ビニル-2-ピロリドン)の合成, 第60回高分子研究発表会(神戸), Jul. 2014.
35.	Yasuhiro Uosaki, Shinsuke Osumi and Ken Yoshida : Fusion Behavior of Biphenyl Derivatives in Carbon Dioxide, The 54th High Pressure Conference of Japan, Nov. 2013.
36.	Ken Yoshida, Masaki Hirayama, Nobuyuki Matubayasi, Yasuhiro Uosaki and Masaru Nakahara : H/D Isotope Effect on Vibrational Spectrum Line Shape in Supercritical Water Studied by Molecular Dynamic Simulation, The 54th High Pressure Conference of Japan, Nov. 2013.
37.	Ken Yoshida, Masaki Hirayama, Nobuyuki Matubayasi, Yasuhiro Uosaki and Masaru Nakahara : Effect of Rotations on Infrared Spectrum of Supercritical Water Studied by Molecular Dynamic Simulation, 36th Symposium on Solution Chemistry of Japan, Oct. 2013.
38.	Satoshi Kubota, Toshihide Horikawa, Ken Yoshida, Masahiro Katoh and Ken-Ichiro Sotowa : NMRを用いたナノ粒子近傍分子の動的挙動観察と粒子相間移動メカニズムの検討, 化学工学会高松大会, Dec. 2012.
39.	Masashi Katanazaka, Ken Yoshida and Yasuhiro Uosaki : Effect of hydration and dehydration on decay of velocity autocorrelation function in supercritical water studied by MD simulation, 第35回溶液化学シンポジウム, Nov. 2012.
40.	Yasuhiro Uosaki, Ayano Shimada and Ken Yoshida : Fusion Behavior of Triphenylphosphines in Compressed Fluids, 第53回高圧討論会, Nov. 2012.
41.	Masashi Katanazaka, Ken Yoshida and Yasuhiro Uosaki : MD simulation study on effect of hydration and dehydration on decay of velocity autocorrelation function in supercritical water, 第53回高圧討論会, Nov. 2012.
42.	一宮宜也, Ken Yoshida and Koichi Ute : 高温高圧下におけるビニルポリマー溶液の高分解能1H NMR, 第17回高分子分析討論会, Oct. 2012.
43.	Noma Tokio, Ken Yoshida and Yasuhiro Uosaki : Kinetics of hydrothermal cleavage of glycoside bond of cellobiose studied by NMR spectroscopy, 第34回溶液化学シンポジウム, Nov. 2011.
44.	Noma Tokio, Ken Yoshida and Yasuhiro Uosaki : Kinetic Analysis of Hydrothermal Decomposition of Glycoside Bond of Disaccharides by Using Solution-State NMR, 2011年日本化学会西日本大会, Nov. 2011.
45.	Nakatani Kazuto, Ken Yoshida and Yasuhiro Uosaki : Effect of Sodium Chloride on the Path Selectivity of the Hydrothermal Decomposition of Formic Acid, 2011年日本化学会西日本大会, Nov. 2011.
46.	Otsuka Keisuke, Ken Yoshida and Yasuhiro Uosaki : Effect of Fluid on Inpregnation of Azobenzene into PMMA in Supercritical States, 2011年日本化学会西日本大会, Nov. 2011.
47.	Kiyohara Yuki, Ken Yoshida and Yasuhiro Uosaki : Dynamic Effect of Cholesterol in Lipid Bilayer: Effect on the Rotational Dynamics of Hydrating Water, 2011年日本化学会西日本大会, Nov. 2011.
48.	Ken Yoshida, Nakatani Kazuto and Yasuhiro Uosaki : Selective Path Control of the Hydrothermal Decomposition of Formic Acid by Using NaCl and Metal Catalysts, 第52回高圧討論会, Nov. 2011.
49.	Yasuhiro Uosaki, Oda Tatsuya and Ken Yoshida : Fusion Behavior of Saturated Fatty Acids in CO2, 第52回高圧討論会, Nov. 2011.
50.	Shintani Megumi, Ken Yoshida, Sakuraba Shun, Nakahara Masaru and Matubayasi Nobuyuki : The effefct of the curvature on the dynamic intermolecular interactions: a solution-state NMR-NOE and large-scae MD simulation study, 日本化学会第91春季年会, Mar. 2011.
51.	Kazuto Nakatani, Ken Yoshida and Yasuhiro Uosaki : Effect of Ions on the Decomposition of Formic Acid in Sub- and Supercritical Water, 33nd Symposyum on Solution Chemistry of Japan, Nov. 2010.
52.	Noma Tokio, Ken Yoshida and Yasuhiro Uosaki : Kinetics and Mechanism of the Hydrothermal Decomposition of Sucrose Studied by In-Situ NMR Measurement, 33nd Symposyum on Solution Chemistry of Japan, Nov. 2010.
53.	Ken Yoshida, Nakahara Masaru, Matubayasi Nobuyuki and Yasuhiro Uosaki : Effect of the Anisotropy of the Hydrogen Bonding Interaction on the Self-Diffusion in Supercritical Water, 33nd Symposyum on Solution Chemistry of Japan, Nov. 2010.
54.	Shintani Megumi, Ken Yoshida, Sakuraba Shun, Nakahara Masaru and Matubayasi Nobuyuki : The curvature dependence of the dynamic intermolecular interactions: a solution-state NMR-NOE and large-scae MD simulation study, 膜シンポジウム 2010, Nov. 2010.
55.	Shintani Megumi, Ken Yoshida, Sakuraba Shun, Nakahara Masaru and Matubayasi Nobuyuki : The curvature dependence of the dynamic intermolecular interactions studied by solution-state NMR and large-scae MD simulation, 第33回溶液化学シンポジウム, Nov. 2010.
56.	Hiroyuki Ogo, Ken-ichi Nomura, Ken Yoshida and Yasuhiro Uosaki : Diffusion of Azobenzene in PMMA Film under Supercritical Carbon Dioxide Atmosphere, The 51th Snnual High Pressure Conference of Japan, Oct. 2010.
57.	Ken Yoshida, Nakahara Masaru, Matubayasi Nobuyuki and Yasuhiro Uosaki : Analysis of the Effect of the Anisotropic Interactions on the Translational Dynamics in Supercritical Water Studied by Using Molecular Dynamics Simulation, The 51th Snnual High Pressure Conference of Japan, Oct. 2010.
58.	Ken Yoshida, Nakahara Masaru, Matubayasi Nobuyuki and Yasuhiro Uosaki : The effect of the anisotropic hydrogen bonding on the self-diffusion and solvation shell dynamics in supercritical water, 32nd Symposyum on Solution Chemistry of Japan, Nov. 2009.

Et cetera, Workshop:

1.	Ken Yoshida : Introduction to Physical Chemistry of Subcritical and Supercritical Aqueous Systems, Online Summer School 2023, Tokushima University, Aug. 2023.
2.	KEITA Kusuhashi, Toshihide Horikawa and Ken Yoshida : 官能基上における水クラスター成長の温度依存性, 中四国支部産学合同コロキウム 2022, PS11, Sep. 2022.
3.	SHINNOSUKE Suhara, Toshihide Horikawa and Ken Yoshida : 量子計算に基づく酸素官能基への水分子吸着に係る電子状態, 中四国支部産学合同コロキウム 2022, PS12, Sep. 2022.
4.	Yuzo Harada, Toshihide Horikawa and Ken Yoshida : 炭素系細孔に対する銅イオン吸着機構の解明, 第14回中四国若手CE合宿, 21, Aug. 2021.
5.	Sae Matsumoto, Toshihide Horikawa and Ken Yoshida : 貴ガス吸着過程における吸着層構造転移の動的変化, 第14回中四国若手CE合宿, 43, Aug. 2021.
6.	池北尚人, 石井雄大, Tomohiro Hirano, Ken Yoshida and Koichi Ute : Pure Shift NMRを用いたポリ乳酸およびポリ(N-ビニルピロリドン)の構造解析, 18-1 NMR研究会, May 2018.
7.	Ken Yoshida : Self-Diffusion Coefficients of Sub- and Supercritical Water: Available Data, Reliable Fitting Functions, and Effects of Temperature and Density, 蒸気性質第139委員会第10期・第12回全体会議特別講演, Jul. 2017.
8.	Ken Yoshida : 水溶液中における炭水化物バイオマスから高付加物質への転換反応の最新研究動向, 蒸気性質第139委員会第10期・第4回全体会議特別講演, Jun. 2015.
9.	Ken Yoshida : 高温高圧NMR法による水・水溶液系のダイナミクスと反応の解析, 蒸気性質第139委員会第10期・第2回全体会議特別講演, Feb. 2015.
10.	Satoshi Kubota, Toshihide Horikawa, Ken Yoshida, Masahiro Katoh and Ken-Ichiro Sotowa : NMRを用いたナノ粒子近傍分子の動的挙動観察と粒子相間移動メカニズムの検討, 第6回中四国若手CE合宿, Dec. 2012.
11.	Ken Yoshida, Kazuto Nakatani, Shiho Mukai and Yasuhiro Uosaki : Selective Path Control of Decomposition of Formic Acid in Hot Water with Hybrid Use of Electrolytes, Workshop on Smart Energy Systems, Mar. 2012.

Report:

1.	Ken Yoshida, Toshihide Horikawa and Naoki Noguchi : Analysis of solvation and dynamics in nanoscale confined space, Research Center for Computational Science Center Report 2022, No.23, 120-123, Sep. 2023.
2.	Ken Yoshida and 泰岡顕治 : Report on IAPWS Annual Meeting 2022, 火力原子力発電2023年8月号, Vol.74, No.8, 46-52, Aug. 2023. (Tokushima University Institutional Repository) ● Metadata: 118617 (Tokushima University Institutional Repository: 118617)
3.	Ken Yoshida, Toshihide Horikawa and Naoki Noguchi : Analysis of solvation and dynamics of molecules and ions in nanoscale space, Research Center for Computational Science Center Report 2021, No.22, 140-143, Sep. 2022.
4.	Ken Yoshida and Toshihide Horikawa : Analysis of adsorption mechanism of heavy metal ions in aqueous solutions on activated carbon, Research Center for Computational Science Center Report 2020, No.21, 153-156, Oct. 2021.
5.	Nobuo Okita, Masaru Nakahara, Kenji Yasuoka and Ken Yoshida : The 51st Meeting of the Executive Committee of The International Association for the Properties of Water and Steam, Jan. 2021.
6.	Ken Yoshida and Toshihide Horikawa : Translational dynamics and solvation structure in water-hydrophobe mixtures under supercritical conditions, Research Center for Computational Science Center Report 2019, No.20, 144-145, Oct. 2020.
7.	Taro Ichihara, Nobuo Okita, Yohei Kayukawa, Tetsuya Sawatsubashi, Shigeki Senoo, Shin-ichi Terada, Masaru Nakahara, Kenji Yasuoka and Ken Yoshida : The 50th Meeting of the Executive Committee and The Meetings of the Working Groups of The International Association for the Properties of Water and Steam, Jan. 2020.
8.	Taro Ichihara, Hiroshi Uchida, Yohei Kayukawa, Hirotaka Kawamura, Tetsuya Sawatsubashi, Shigeki Senoo, Masaru Nakahara, Hideo Hirano, Kenji Yasuoka, Ken Yoshida and Nobuo Okita : The 49th Meeting of the Executive Committee(EC) and The Meetings of the Working Groups(WG) of The International Association for the Properties of Water and Steam (IAPWS) and The 17th International Conference on the Properties of Water and Steam, Dec. 2018.
9.	Nobuo Ishihara, Taro Ichihara, Masakatsu Ueno, Hiroshi Uchida, Yohei Kayukawa, Masaru Nakahara, Hideo Hirano, Hitoshi Fukushima, Hiroyuki Miyamoto, Shintaro Mori, Kenji Yasuoka, Naoko Yamaguchi, Ken Yoshida, Yoichi Wada and Nobuo Okita : The 48th Meeting of the Executive Committee(EC) and Meetings of the Working Groups(WG) of The International Association for the Properties of Water and Steam (IAPWS), Dec. 2017.
10.	Nobuo Ishihara, Taro Ichihara, Hiroshi Uchida, Nobuo Okita, Yohei Kayukawa, Sho Shinotsuka, Masaru Nakahara, Hideo Hirano, Youichi Wada and Ken Yoshida : The 47th Meeting of the Executive Committee(EC) and Meetings of the Working Groups(WG) of The International Association for the Properties of Water and Steam (IAPWS), Dec. 2016.
11.	Nobuo Ishihara, Taro Ichihara, Shunsuke Uchida, Hiroshi Uchida, Masaru Nakahara, Hideo Hirano, Hiroyuki Miyamoto and Ken Yoshida : The 46th Meeting of the Executive Committee(EC) and Meetings of the Working Groups(WG) of The International Association for the Properties of Water and Steam (IAPWS), Nov. 2015.
12.	Toshihide Horikawa and Ken Yoshida : 化学応用工学科のFD活動, 平成26年度FD研究報告書, Mar. 2015.
13.	Masaru Nakahara, Hideo Hirano, Taro Ichihara, Haruka Kido, Ken Yoshida, Satoshi Hanawa and Shunsuke Uchida : The 45th Meeting of the Executive Committee(EC) and Meetings of the Working Groups(WG) of The International Association for the Properties of Water and Steam (IAPWS), Nov. 2014.
14.	Ken Yoshida : Report on 16th International Conference on the Properties of Water and Steam, The Review of High Pressure Science and Technology, Vol.24, No.3, 232-234, Aug. 2014. (Link to Publication Site) ● Publication site (DOI): 10.4131/jshpreview.24.232 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-84907552314 (DOI: 10.4131/jshpreview.24.232, Elsevier: Scopus)

Patent:

1.	中原勝, 松林伸幸, 若井千尋 and Ken Yoshida : 水熱反応を利用した水素の製造方法, 2004108287 (Mar. 2004), 2005289742 (Oct. 2005), 4481060 (Mar. 2010).

Grants-in-Aid for Scientific Research (KAKEN Grants Database @ NII.ac.jp)

Transport properties of geofluids including hydrocarbon under high pressure and temperature (Project/Area Number: 24K07175 )
脂肪族アミンによる金属防食皮膜のラビリンス型秩序構造の形成機構解明と機能制御 (Project/Area Number: 23K04680 )
蒸気発電装置用の新規防食剤の膜形成機構の解明 (Project/Area Number: 20K05433 )
NMR and computer experiments on local hydrogen bonding and fluctuations in super- and subcritical water-organic mixtures (Project/Area Number: 17K05754 )
Molecular dynamic simulation and high-temperature NMR studies on the role of stretching vibration in the translational and rotational dynamics in supercritical water (Project/Area Number: 25410019 )
Experimental and theoretical analysis of the dynamics and the solvation state of cholesterol in bilayer membrane (Project/Area Number: 21850021 )
Search by Researcher Number (80549171)

Associate Professor : Yoshida, Ken

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Grants-in-Aid for Scientific Research (KAKEN Grants Database @ NII.ac.jp)