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
1994
11 Citations (Scopus)
Hydrogen Bonds
clathrates
Hydrates
hydrates
Methanol
16 Citations (Scopus)

Stability of polar guest-encaging clathrate hydrates

Koga, K., Tanaka, H. & Nakanishi, K., 1994, In : The Journal of Chemical Physics. 101, 4, p. 3127-3134 8 p.

Research output: Contribution to journalArticle

clathrates
Hydrates
hydrates
Amines
amines
1996
28 Citations (Scopus)
clathrates
Hydrates
hydrates
Hydrogen
Defects
5 Citations (Scopus)

Rearrangement of the hydrogen-bonded network of the clathrate hydrates encaging polar guest

Koga, K., Tanaka, H. & Nakanishi, K., 1996, In : Molecular Simulation. 16, 1-3, p. 151-165 15 p.

Research output: Contribution to journalArticle

clathrates
Hydrates
Rearrangement
hydrates
Hydrogen
15 Citations (Scopus)

RISM integral equation study of local solvation behavior of naphthalene in supercritical carbon dioxide

Koga, K., Tanaka, H. & Zeng, X. C., Oct 10 1996, In : Journal of Physical Chemistry. 100, 41, p. 16711-16719 9 p.

Research output: Contribution to journalArticle

Solvation
Naphthalene
naphthalene
Carbon Dioxide
Integral equations
1997
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
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
14 Citations (Scopus)

Scanning motions of an atomic force microscope tip in water

Koga, K. & Zeng, X. C., 1997, In : Physical Review Letters. 79, 5, p. 853-856 4 p.

Research output: Contribution to journalArticle

microscopes
scanning
water
trajectories
integral equations
7 Citations (Scopus)

Solvent-induced interactions between hydrophobic and hydrophilic polyatomic sheets in water and hypothetical nonpolar water

Koga, K., Zeng, X. C. & Tanaka, H., Jun 15 1997, In : The Journal of Chemical Physics. 106, 23, p. 9781-9792 12 p.

Research output: Contribution to journalArticle

Water
water
interactions
intermolecular forces
attraction
1998
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)

Study of hydrophillic interactions between polyatomic sheets in water

Koga, K., Zeng, X. C. & Tanaka, H., 1998, In : Fluid Phase Equilibria. 144, 1-2, p. 377-385 9 p.

Research output: Contribution to journalArticle

Water
water
interactions
Biomolecules
Integral equations
119 Citations (Scopus)

Validity of Tolman's equation: How large should a droplet be?

Koga, K., Zeng, X. C. & Shchekin, A. K., 1998, In : The Journal of Chemical Physics. 109, 10, p. 4063-4070 8 p.

Research output: Contribution to journalArticle

Molecules
Surface tension
interfacial tension
molecules
Capillarity
1999
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
31 Citations (Scopus)
Nanopore
Freezing
freezing
ice
Water

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

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
42 Citations (Scopus)

Thermodynamic expansion of nucleation free-energy barrier and size of critical nucleus near the vapor-liquid coexistence

Koga, K. & Zeng, X. C., Feb 15 1999, In : The Journal of Chemical Physics. 110, 7, p. 3466-3471 6 p.

Research output: Contribution to journalArticle

Energy barriers
Free energy
Nucleation
free energy
Vapors
2000
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
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
2001
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

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
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
2002
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
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
34 Citations (Scopus)

Solvation forces and liquid-solid phase equilibria for water confined between hydrophobic surfaces

Koga, K., Jun 22 2002, In : The Journal of Chemical Physics. 116, 24, p. 10882-10889 8 p.

Research output: Contribution to journalArticle

Solvation
Phase equilibria
solvation
solid phases
Water
2003
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
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
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
206 Citations (Scopus)

The hydrophobic effect

Widom, B., Bhimalapuram, P. & Koga, K., Aug 1 2003, In : Physical Chemistry Chemical Physics. 5, 15, p. 3085-3093 9 p.

Research output: Contribution to journalArticle

Free energy
attraction
free energy
Hydrophobicity
hydrophobicity
2004
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

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
55 Citations (Scopus)

On the thermodynamic stability of clathrate hydrates IV: Double occupancy of cages

Tanaka, H., Nakatsuka, T. & Koga, K., Sep 15 2004, In : The Journal of Chemical Physics. 121, 11, p. 5488-5493 6 p.

Research output: Contribution to journalArticle

Argon
clathrates
Hydrates
hydrates
Thermodynamic stability

Reply to Comment on The hydrophobic effect by G. Graziano

Kouga, K., 2004, In : Phys. Chem. Chem. Phys.. 6, p. 4529-4530 2 p.

Research output: Contribution to journalArticle

2005
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
18 Citations (Scopus)

On the thermodynamic stability and structural transition of clathrate hydrates

Koyama, Y., Tanaka, H. & Koga, K., 2005, In : The Journal of Chemical Physics. 122, 7, 074503.

Research output: Contribution to journalArticle

clathrates
Hydrates
Ethane
hydrates
Methane
102 Citations (Scopus)

Phase diagram of water between hydrophobic surfaces

Koga, K. & Tanaka, H., Mar 8 2005, In : The Journal of Chemical Physics. 122, 10, 104711.

Research output: Contribution to journalArticle

Ice
Phase diagrams
ice
phase diagrams
Water
2006
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
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
6 Citations (Scopus)
Ice
Hydrates
Water
Liquids
Thermodynamic stability
2007
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
58 Citations (Scopus)

On the thermodynamic stability of hydrogen clathrate hydrates

Katsumasa, K., Koga, K. & Tanaka, H., 2007, In : The Journal of Chemical Physics. 127, 4, 044509.

Research output: Contribution to journalArticle

clathrates
Hydrates
hydrates
Hydrogen
Thermodynamic stability
61 Citations (Scopus)

Phase equilibria and interfacial tension of fluids confined in narrow pores

Hamada, Y., Koga, K. & Tanaka, H., 2007, In : The Journal of Chemical Physics. 127, 8, 084908.

Research output: Contribution to journalArticle

Phase equilibria
Surface tension
interfacial tension
porosity
Pore size
16 Citations (Scopus)

Structures of filled ice nanotubes inside carbon nanotubes

Takaiwa, D., Koga, K. & Tanaka, H., Jan 2007, In : Molecular Simulation. 33, 1-2, p. 127-132 6 p.

Research output: Contribution to journalArticle

Carbon Nanotubes
Ice
Nanotubes
Carbon nanotubes
nanotubes
2008
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
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
192 Citations (Scopus)

Phase diagram of water in carbon nanotubes

Takaiwa, D., Hatano, I., Koga, K. & Tanaka, H., Jan 8 2008, In : Proceedings of the National Academy of Sciences of the United States of America. 105, 1, p. 39-43 5 p.

Research output: Contribution to journalArticle

Carbon Nanotubes
Ice
Freezing
Water
Nanotubes
2009
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
6 Citations (Scopus)

Phase behavior and fluid-solid surface tension of argon in slit pores and carbon nanotubes

Hamada, Y., Koga, K. & Tanaka, H., Jun 15 2009, In : Physica A: Statistical Mechanics and its Applications. 388, 12, p. 2289-2298 10 p.

Research output: Contribution to journalArticle

Nanotubes
Surface Tension
solid surfaces
slits
nanotubes
2010
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