Kenichiro Koga

Ph.D, Professor

  • 3017 Citations
  • 24 h-Index
19942019
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Research Output 1994 2019

  • 3017 Citations
  • 24 h-Index
  • 84 Article
  • 2 Editorial
Article
43 Citations (Scopus)

Ab initio studies of quasi-one-dimensional pentagon and hexagon ice nanotubes

Bai, J., Su, C. R., Parra, R. D., Zeng, X. C., Tanaka, H., Koga, K. & Li, J. M., Mar 1 2003, In : The Journal of Chemical Physics. 118, 9, p. 3913-3916 4 p.

Research output: Contribution to journalArticle

hexagons
Ice
Nanotubes
nanotubes
ice
31 Citations (Scopus)

A plastic phase of water from computer simulation

Takii, Y., Koga, K. & Tanaka, H., 2008, In : The Journal of Chemical Physics. 128, 20, 204501.

Research output: Contribution to journalArticle

Ice
plastics
computerized simulation
Plastics
ice
6 Citations (Scopus)

Application of reference-modified density functional theory: Temperature and pressure dependences of solvation free energy

Sumi, T., Maruyama, Y., Mitsutake, A., Mochizuki, K. & Koga, K., 2017, (Accepted/In press) In : Journal of Computational Chemistry.

Research output: Contribution to journalArticle

Solvation
Density Functional
Free energy
Density functional theory
Free Energy
6 Citations (Scopus)

A reference-modified density functional theory: An application to solvation free-energy calculations for a Lennard-Jones solution

Sumi, T., Maruyama, Y., Mitsutake, A. & Koga, K., Jun 14 2016, In : Journal of Chemical Physics. 144, 22, 224104.

Research output: Contribution to journalArticle

Solvation
Free energy
Density functional theory
solvation
free energy
24 Citations (Scopus)

Augmented stability of hydrogen clathrate hydrates by weakly polar molecules

Nakayama, T., Koga, K. & Tanaka, H., 2009, In : The Journal of Chemical Physics. 131, 21, 214506.

Research output: Contribution to journalArticle

clathrates
Hydrates
hydrates
Hydrogen
Acetone
15 Citations (Scopus)

Can thin disk-like ice clusters be more stable than compact droplet-like ice clusters?

Tanaka, H., Yamamoto, R., Koga, K. & Zeng, X. C., May 7 1999, In : Chemical Physics Letters. 304, 5-6, p. 378-384 7 p.

Research output: Contribution to journalArticle

Ice
ice
Potential energy
Molecules
Water
27 Citations (Scopus)

Close-packed structures and phase diagram of soft spheres in cylindrical pores

Koga, K. & Tanaka, H., Apr 7 2006, In : The Journal of Chemical Physics. 124, 13, 131103.

Research output: Contribution to journalArticle

Phase diagrams
diagrams
phase diagrams
Phase boundaries
porosity
2 Citations (Scopus)

Comment on "The hydrophobic effect" by B. Widom, P. Bhimalapuram and K. Koga, Phys. Chem. Chem. Phys., 2003, 5, 3085

Graziano, G., Widom, B., Bhimalapuram, P. & Koga, K., Sep 21 2004, In : Physical Chemistry Chemical Physics. 6, 18, p. 4527-4530 4 p.

Research output: Contribution to journalArticle

19 Citations (Scopus)

Computer simulation of bilayer ice: Structures and thermodynamics

Slovák, J., Tanaka, H., Koga, K. & Zeng, X. C., Mar 1 2003, In : Physica A: Statistical Mechanics and its Applications. 319, p. 163-174 12 p.

Research output: Contribution to journalArticle

Thermodynamics
ice
Crystal
Computer Simulation
computerized simulation
6 Citations (Scopus)

Computer simulation of water-ice transition in hydrophobic nanopores

Slovák, J., Tanaka, H., Koga, K. & Zeng, X. C., Mar 15 2001, In : Physica A: Statistical Mechanics and its Applications. 292, 1-4, p. 87-101 15 p.

Research output: Contribution to journalArticle

Nanopore
ice
Crystal
Computer Simulation
computerized simulation
31 Citations (Scopus)
Nanopore
Freezing
freezing
ice
Water
7 Citations (Scopus)

Cononsolvency behavior of hydrophobes in water + methanol mixtures

Mochizuki, K. & Koga, K., 2016, In : Physical Chemistry Chemical Physics. 18, 24, p. 16188-16195 8 p.

Research output: Contribution to journalArticle

Methanol
Methane
methyl alcohol
Water
Chemical potential
18 Citations (Scopus)

Correlation between hydrophobic attraction and the free energy of hydrophobic hydration

Koga, K., Bhimalapuram, P. & Widom, B., Dec 20 2002, In : Molecular Physics. 100, 24, p. 3795-3801 7 p.

Research output: Contribution to journalArticle

Hydration
Free energy
attraction
hydration
free energy

Correlation functions in decorated lattice models

Ispolatov, I., Koga, K. & Widom, B., Mar 1 2001, In : Physica A: Statistical Mechanics and its Applications. 291, 1-4, p. 49-59 11 p.

Research output: Contribution to journalArticle

Lattice Model
Correlation Function
Partition Function
Ising Model
Strings
2 Citations (Scopus)
Phase equilibria
Surface tension
interfacial tension
Phase interfaces
illuminating
8 Citations (Scopus)

Deriving Second Osmotic Virial Coefficients from Equations of State and from Experiment

Koga, K., Holten, V. & Widom, B., Sep 17 2015, In : Journal of Physical Chemistry B. 119, 42, p. 13391-13397 7 p.

Research output: Contribution to journalArticle

virial coefficients
Equations of state
solutes
equations of state
Propane
3 Citations (Scopus)

Diffusivity of liquid argon in carbon nanotubes

Akiyoshi, H. & Koga, K., Sep 2012, In : Journal of the Physical Society of Japan. 81, SUPPL. A, SA022.

Research output: Contribution to journalArticle

diffusivity
carbon nanotubes
argon
diffusion coefficient
liquids

Discovery of two-dimensional ice - Peculiar structure predicted by computer simulation

Kouga, K., 1999, In : Chemistry. 54, p. 41-46 6 p.

Research output: Contribution to journalArticle

13 Citations (Scopus)

Driving forces for the pressure-induced aggregation of poly(N-isopropylacrylamide) in water

Mochizuki, K., Sumi, T. & Koga, K., 2016, In : Physical Chemistry Chemical Physics. 18, 6, p. 4697-4703 7 p.

Research output: Contribution to journalArticle

Agglomeration
Water
water
pressure dependence
Molecules
30 Citations (Scopus)

Effects of confinement on the phase behavior of supercooled water

Koga, K., Zeng, X. C. & Tanaka, H., Mar 20 1998, In : Chemical Physics Letters. 285, 3-4, p. 278-283 6 p.

Research output: Contribution to journalArticle

Phase behavior
Water
water
Film thickness
film thickness
1 Citation (Scopus)

Efficiency at maximum power for an isothermal chemical engine with particle exchange at varying chemical potential

Koning, J., Koga, K. & Indekeu, J. O., Feb 1 2017, In : European Physical Journal: Special Topics. 226, 3, p. 427-431 5 p.

Research output: Contribution to journalArticle

Chemical potential
engines
Engines
cycles
Temperature
19 Citations (Scopus)

Electrostatic field-exposed water in nanotube at constant axial pressure

He, Y., Sun, G., Koga, K. & Xu, L., Oct 16 2014, In : Scientific Reports. 4, 6596.

Research output: Contribution to journalArticle

nanotubes
electric fields
water
electrostriction
prisms
1 Citation (Scopus)

First- and second-order wetting transitions at liquid-vapor interfaces

Koga, K., Indekeu, J. O. & Widom, B., 2010, In : Faraday Discussions. 146, p. 217-222 6 p.

Research output: Contribution to journalArticle

liquid-vapor interfaces
wetting
Wetting
Vapors
Liquids
243 Citations (Scopus)

First-order transition in confined water between high-density liquid and low-density amorphous phases

Koga, K., Tanaka, H. & Zeng, X. C., Nov 30 2000, In : Nature. 408, 6812, p. 564-567 4 p.

Research output: Contribution to journalArticle

Water
Hydrogen
Atmospheric Pressure
Phase Transition
Ice
28 Citations (Scopus)

Formation of ice nanotube with hydrophobic guests inside carbon nanotube

Tanaka, H. & Koga, K., Sep 1 2005, In : The Journal of Chemical Physics. 123, 9, 094706.

Research output: Contribution to journalArticle

Carbon Nanotubes
Ice
Nanotubes
nanotubes
ice
816 Citations (Scopus)

Formation of ordered ice nanotubes inside carbon nanotubes

Koga, K., Gao, G. T., Tanaka, H. & Zeng, X. C., Aug 23 2001, In : Nature. 412, 6849, p. 802-805 4 p.

Research output: Contribution to journalArticle

Nanotubes
Carbon Nanotubes
Ice
Water
Phase Transition
18 Citations (Scopus)

Formation of quasi two-dimensional bilayer ice in hydrophobic slits: A possible candidate for ice XIII?

Bai, J., Zeng, X. C., Koga, K. & Tanaka, H., Aug 1 2003, In : Molecular Simulation. 29, 10-11, p. 619-626 8 p.

Research output: Contribution to journalArticle

Ice
slits
ice
Water
water
10 Citations (Scopus)

Freezing in one-dimensional liquids

Koga, K., May 1 2003, In : The Journal of Chemical Physics. 118, 17, p. 7973-7980 8 p.

Research output: Contribution to journalArticle

Freezing
freezing
Liquids
liquids
Ising model
172 Citations (Scopus)

Freezing of confined water: A bilayer ice phase in hydrophobic nanopores

Koga, K., Zeng, X. C. & Tanaka, H., Jan 1 1997, In : Physical Review Letters. 79, 26, p. 5262-5265 4 p.

Research output: Contribution to journalArticle

freezing
ice
water
entropy
hexagons
74 Citations (Scopus)

How does water freeze inside carbon nanotubes?

Koga, K., Gao, G. T., Tanaka, H. & Zeng, X. C., 2002, In : Physica A: Statistical Mechanics and its Applications. 314, 1-4, p. 462-469 8 p.

Research output: Contribution to journalArticle

Nanotubes
Carbon
carbon nanotubes
Water
thermodynamics
3 Citations (Scopus)

How much does the core structure of a three-phase contact line contribute to the line tension near a wetting transition?

Indekeu, J. O., Koga, K. & Widom, B., May 18 2011, In : Journal of Physics Condensed Matter. 23, 19, 194101.

Research output: Contribution to journalArticle

Phase Transition
Thermodynamics
wetting
Wetting
Mean field theory
12 Citations (Scopus)

Hydrophobic effect in the pressure-temperature plane

Koga, K., Oct 15 2004, In : The Journal of Chemical Physics. 121, 15, p. 7304-7312 9 p.

Research output: Contribution to journalArticle

Temperature
temperature
attraction
solvation
Solvation
6 Citations (Scopus)

Hydrophobicity in Lennard-Jones solutions

Ishizaki, M., Tanaka, H. & Koga, K., Feb 14 2011, In : Physical Chemistry Chemical Physics. 13, 6, p. 2328-2334 7 p.

Research output: Contribution to journalArticle

Solvation
Hydrophobicity
hydrophobicity
solvation
isochoric processes

Hydrophobicity Varying with Temperature, Pressure, and Salt Concentration

Koga, K. & Yamamoto, N., Apr 5 2018, In : Journal of Physical Chemistry B. 122, 13, p. 3655-3665 11 p.

Research output: Contribution to journalArticle

Solvation
Hydrophobicity
hydrophobicity
Hydrophobic and Hydrophilic Interactions
Salts
4 Citations (Scopus)

Hydrophobic polymer chain in water that undergoes a coil-to-globule transition near room temperature

Hatano, I., Mochizuki, K., Sumi, T. & Koga, K., Dec 1 2016, In : Journal of Physical Chemistry B. 120, 47, p. 12127-12134 8 p.

Research output: Contribution to journalArticle

globules
Polymers
coils
Temperature
Water
70 Citations (Scopus)

Ice nanotube: what does the unit cell look like?

Koga, K., Parra, R. D., Tanaka, H. & Zeng, X. C., Sep 22 2000, In : The Journal of Chemical Physics. 113, 12, p. 5037-5040 4 p.

Research output: Contribution to journalArticle

Ice
Nanotubes
nanotubes
ice
cells
6 Citations (Scopus)

Imaging point defects in a liquid environment: A model AFM study

Koga, K., 1999, In : Physical Review B - Condensed Matter and Materials Physics. 60, 20, p. 14328-14333 6 p.

Research output: Contribution to journalArticle

Point defects
point defects
Atomic force microscopy
atomic force microscopy
Imaging techniques
1 Citation (Scopus)

Inclusion of neon inside ice I c and its influence to the ice structure

Hakim, L., Matsumoto, M., Koga, K. & Tanaka, H., Sep 2012, In : Journal of the Physical Society of Japan. 81, SUPPL. A, SA018.

Research output: Contribution to journalArticle

neon
ice
inclusions
simulation
Lennard-Jones potential
12 Citations (Scopus)

Infinite-order transitions in density-functional models of wetting

Koga, K., Indekeu, J. O. & Widom, B., Jan 19 2010, In : Physical Review Letters. 104, 3, 036101.

Research output: Contribution to journalArticle

wetting
loci
2 Citations (Scopus)

Influence of co-non-solvency on hydrophobic molecules driven by excluded volume effect

Mochizuki, K., Sumi, T. & Koga, K., 2017, In : Physical Chemistry Chemical Physics. 19, 35, p. 23915-23918 4 p.

Research output: Contribution to journalArticle

neopentane
Propane
Molecules
Methane
propane
26 Citations (Scopus)

Large thermal expansivity of clathrate hydrates

Tanaka, H., Tamai, Y. & Koga, K., Aug 14 1997, In : Journal of Physical Chemistry B. 101, 33, p. 6560-6565 6 p.

Research output: Contribution to journalArticle

clathrates
Hydrates
hydrates
Ice
ice
4 Citations (Scopus)

Line adsorption in a mean-field density-functional model

Koga, K. & Widom, B., Nov 2006, In : Molecular Physics. 104, 22-24, p. 3469-3477 9 p.

Research output: Contribution to journalArticle

Adsorption
adsorption
Gibbs adsorption equation
analogs
Thermodynamics
12 Citations (Scopus)

Line and boundary tensions on approach to the wetting transition

Koga, K. & Widom, B., 2007, In : The Journal of Chemical Physics. 127, 6, 064704.

Research output: Contribution to journalArticle

wetting
Wetting
Byproducts
symmetry
7 Citations (Scopus)
liquid phases
aqueous solutions
liquids
molecules
temperature dependence
2 Citations (Scopus)

Local solubility of nonpolar molecules in the liquid-vapor interfaces of water and simple liquids

Abe, K. & Koga, K., 2014, In : Journal of Molecular Liquids. 200, PA, p. 7-11 5 p.

Research output: Contribution to journalArticle

liquid-vapor interfaces
solubility
Solubility
Vapors
Molecules
5 Citations (Scopus)

Mean-Field Approximation to the Hydrophobic Hydration in the Liquid-Vapor Interface of Water

Abe, K., Sumi, T. & Koga, K., Mar 3 2016, In : Journal of Physical Chemistry B. 120, 8, p. 2012-2019 8 p.

Research output: Contribution to journalArticle

liquid-vapor interfaces
Hydration
hydration
Solvation
solutes
11 Citations (Scopus)

Mean-field density-functional model of a second-order wetting transition

Koga, K. & Widom, B., 2008, In : The Journal of Chemical Physics. 128, 11, 114716.

Research output: Contribution to journalArticle

wetting
Wetting
interfacial tension
1 Citation (Scopus)

Model of freezing behavior of liquid monolayers adsorbed in cylindrical pores

Abe, K. & Koga, K., Sep 2012, In : Journal of the Physical Society of Japan. 81, SUPPL. A, SA021.

Research output: Contribution to journalArticle

freezing
porosity
liquids
interactions
cells
4 Citations (Scopus)

Note on the calculation of the second osmotic virial coefficient in stable and metastable liquid states

Widom, B. & Koga, K., Jan 31 2013, In : Journal of Physical Chemistry B. 117, 4, p. 1151-1154 4 p.

Research output: Contribution to journalArticle

virial coefficients
Chemical potential
Liquids
liquids
metastable state
8 Citations (Scopus)

Novel neon-hydrate of cubic ice structure

Hakim, L., Koga, K. & Tanaka, H., May 1 2010, In : Physica A: Statistical Mechanics and its Applications. 389, 9, p. 1834-1838 5 p.

Research output: Contribution to journalArticle

neon
hydrates
ice
Chemical Potential
Voids