NEWS
On the Occurrence of Clathrate Hydrates in Extreme Conditions: Dissociation Pressures and Occupancies at Cryogenic Temperatures with Application to Planetary Systems
Last update: December 18, 2020
Our paper has been published. Tanaka, H, Yagasaki, T, Matsumoto, M. On the Occurrence of Clathrate Hydrates in Extreme Conditions: Dissociation Pressures and Occupancies at Cryogenic Temperatures with Application to Planetary Systems Planet. Sci. J., Volume 1, Number 3 doi:10.3847/PSJ/abc3c0 We investigate the thermodynamic stability of clathrate hydrates at cryogenic temperatures from the 0 K limit to 200 K in a wide range of pressures, covering the thermodynamic conditions of inte ... [Detail]
Cage occupancy and dissociation enthalpy of hydrocarbon hydrates
Last update: October 27, 2020
Our paper has been published. Tanaka, H, Yagasaki, T, Matsumoto, M. Cage occupancy and dissociation enthalpy of hydrocarbon hydrates. AIChE J. 2020;e17009. doi:10.1002/aic.17009 An elaborated statistical mechanical theory on clathrate hydrates is applied to exploration of their phase equilibria and dissociation enthalpies. The experimental dissociation pressures of methane, ethane, acetylene, and propane hydrates are well recovered by the method we have proposed. We estimate water ... [Detail]
Molecular dynamics study of grain boundaries and triple junctions in ice
Last update: September 24, 2020
Our paper has been published. Molecular dynamics study of grain boundaries and triple junctions in ice T. Yagasaki, M. Matsumoto, and H. Tanaka, J. Chem. Phys. 153, 124502 (2020); DOI:10.1063/5.0021635 [Detail]
Lennard-Jones Parameters Determined to Reproduce the Solubility of NaCl and KCl in SPC/E, TIP3P, and TIP4P/2005 Water
Last update: June 25, 2020
Our paper has been published. Lennard-Jones Parameters Determined to Reproduce the Solubility of NaCl and KCl in SPC/E, TIP3P, and TIP4P/2005 Water T. Yagasaki, M. Matsumoto, and H. Tanaka, J. Chem. Theory Comput. 16, 2460 (2020). DOI:10.1021/acs.jctc.9b00941 [Detail]
Atomic vibrational amplitudes and localization of phonons in ordered and disordered ices
Last update: March 5, 2020
Our paper has been published. On the role of intermolecular vibrational motions for ice polymorphs. II. Atomic vibrational amplitudes and localization of phonons in ordered and disordered ices Hideki Tanaka, Takuma Yagasaki, and Masakazu Matsumoto J. Chem. Phys. 152, 074501 (2020). DOI:0.1063/1.5139697 [Detail]
Volumetric properties of crystalline and amorphous ices
Last update: October 11, 2019
Our paper has been published. On the role of intermolecular vibrational motions for ice polymorphs I: Volumetric properties of crystalline and amorphous ices Hideki Tanaka, Takuma Yagasaki, and Masakazu Matsumoto J. Chem. Phys. 151, 114501 (2019) DOI:0.1063/1.5119748 The mole volume, thermal expansivity, and the isothermal compressibility was calculated using the quasi-harmonic approximation for various ice phases including amorphous solids. ... [Detail]
Formation of Hot Ice Caused by Carbon Nanobrushes
Last update: August 9, 2019
“Merry” and “tragical”? “Tedious” and “brief”? That is hot ice and wondrous strange snow. How shall we find the concord of this discord? -- William Shakespeare Our group's new paper has been published. Immersing carbon nanotube brushes in water may freeze the water at temperatures much higher than normal freezing points. In the past, there have been many attempts to control the melting point of water by mixing it with liquid ... [Detail]
Liquid-Liquid Separation of Aqueous Solutions: A Molecular Dynamics Study
Last update: June 24, 2019
A new research paper of our group has been published. Takuma Yagasaki, Masakazu Matsumoto, and Hideki Tanaka Liquid-Liquid Separation of Aqueous Solutions: A Molecular Dynamics Study J. Chem. Phys. 150, 214506 (2019). [https://doi.org/10.1063/1.5096429 DOI: 10.1063/1.5096429] In the liquid-liquid phase transition scenario, supercooled water separates into the high density liquid (HDL) and low density liquid (LDL) phases at temperatures lower than the second criti ... [Detail]
A Bayesian Approach for Identification of Ice Ih, ice Ic, High Density and Low Density Liquid Water with a Torsional Order Parameter
Last update: June 24, 2019
A new paper from our group has been published. Masakazu Matsumoto, Takuma Yagasaki, and Hideki Tanaka A Bayesian Approach for Identification of Ice Ih, ice Ic, High Density and Low Density Liquid Water with a Torsional Order Parameter J. Chem. Phys. 150, 214504 (2019). DOI: 10.1063/1.5096556 Focusing on the dihedral angle distribution of the hydrogen bond network, we developed a new analysis method to distinguish ice, water, and supercooled liquid water on a molecular ... [Detail]
Negative Thermal Expansivity of Ice: Comparison of the Monatomic mW Model with the All-Atom TIP4P/2005 Water Model
Last update: May 15, 2019
Mahfuzh Huda, Takuma Yagasaki, Masakazu Matsumoto, Hideki Tanaka Negative Thermal Expansivity of Ice: Comparison of the Monatomic mW Model with the All-Atom TIP4P/2005 Water Model Crystals, 9(5), 248 (2019). DOI:10.3390/cryst9050248 Ordinary substances shrink as the temperature decreases, but ice expands at very low temperatures. This phenomenon, called the negative thermal expansion of ice, is one of the abnormal properties of water. (Liquid water also exhibits a negative ther ... [Detail]
