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Yoshikata Koga

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Research and Teaching Interests

Dr. Koga's group has introduced a new approach to the thermodynamic studies of aqueous solutions. Methods of measuring various thermodynamic quantities differentially were devised. Using these, the inter-molecular interaction, the key quantity in the so-called "many-body problem", can be evaluated experimentally.

For the aqueous solutions of 2-butoxyethanol, a common model system for solutions of biochemical importance, it was pointed out that there are regions in the composition-temperature field, in each of which the "mixing scheme" is qualitatively different. Furthermore, the transition from one mixing scheme to the other was found much more subtle than the normal phase transition. At the boundary separating two mixing schemes, the thermodynamic quantities that are proportional to the third derivatives of the Gibbs energy showed anomalies. (In contrast, the normal phase transitions are accompanied by anomalies in the second derivatives; heat capacity, compressibility etc.) The boundary separating the two regions has been dubbed as the "Koga linien" by Danish collaborators.

Koga Linien

The group has started applying this new methodology to aqueous solutions of biopolymers. In particular, the effect of a third component on the function and the state of biopolymers in queous solutions is now studied.

There is a preliminary indication that "Koga linien" plays an important role in dictating the nature of biopolymers.

As a recognition of his contribution to solution thermodynamics, he was awarded the Society Award by The Japan Society of Calorimetry and Thermal Analysis in 2006.

He published a monograph, "Solution Thermodynamics and Its Application to Aqueous Solutions: A Differential Approach", Elsevier, Amsterdam (2007) ISBN:978-0-444-53073-8 summarizing his works up to about 2006.

In 2011, he obtained for the first time in the world a fourth derivative of Gibbes energy and named it "Accerelation of the effect of solute on entropy-volume cross fluctuation density."  See J. Chem. Phys. 134(2011) 214502.

Contact

Real name: 
Yoshikata Koga
Email: 
Office Room Number(s): 
D134
Office Phone Number: 
604-822-3491
Fax Number: 
604-822-2847

Curriculum Vitae

Senior Instructor Emeritus; B. Sc., Tokyo (1960); M. Sc.,Tokyo (1962); Ph. D., British Columbia(L. G. Harrison, 1969); Teaching Postdoctoral, British Columbia (L. G. Harrison 1969 -71);Visiting Scholar, McMaster (J. A. Morrison,1975, 76, 84, 86, 87); Guest Professor,Tokyo Institute of Technology (1993-94, 2000). Guest Professor, Technical University of Denmark (2000). Guest Professor, Chiba University (2001-2002, 2003, 2004). Guest Professor, Roskilde University (2003) , ”JSCTA Award” from the Japan Society of Calorimetry and Thermal Analysis (2006). Published monograph, "Solution Thermodynamics and Its Application to Aqueous Solutions: A Differential Approach."  Elsevier, Amsterdam (2007). Obtained for the first time in the world a fourth derivative of Gibbes energy and named it "Accerelation of the effect of solute on entropy-volume cross fluctuation density."  See J. Chem. Phys. 134(2011) 214502.

Publications

2018

Koga, Y. The Second And Higher Order Derivative Thermodynamic Quantities And Fluctuation Functions. Journal of Molecular Liquids 2018, 249, 1009–1011.
Yonenaga, K. ; Morita, T. ; Nishikawa, K. ; Koga, Y. Effects Of Ionic Liquid Constituent Cations, Tetraalkylammoniums, On Water Studied By Means Of The “1-Propanol Probing Methodology”. Journal of Molecular Liquids 2018, 252, 58-61.

2017

Sebe, F. ; Nishikawa, K. ; Koga, Y. Spectra Of Excess Molar Absorptivity Of Aqueous Solutions Of Ionic Liquids: Universal Chromophores For Aqueous Electrolytes?. Journal of Molecular Liquids 2017, 238, 570–573.
Koga, Y. Solution Thermodynamics And Its Application To Aqueous Solutions: A Differential Approach; Elsevier, 2017.
Nitta, A. ; Morita, T. ; Nishikawa, K. ; Koga, Y. Mixing Scheme Of The Aqueous Solution Of Tetrabutylphosphonium Trifluoroacetate In The Water-Rich Region. Physical Chemistry Chemical Physics 2017, 19, 16888-16896.
Koga, Y. ; Miki, K. ; Nishikawa, K. Effects Of H+ And Oh- On H 2 O As Probed By The 1-Propanol Probing Methodology: Differential Thermodynamic Approach. Physical Chemistry Chemical Physics 2017, 19, 27413–27420.

2016

Koga, Y. Spectroscopy Vs. Thermodynamics, Or G Vs. G E In Studies Of Aqueous Solutions. Journal of Molecular Liquids 2016, 219, 1006–1009.
Ohgi, H. ; Imamura, H. ; Yonenaga, K. ; Morita, T. ; Nishikawa, K. ; Westh, P. ; Koga, Y. The Effect Of 2, 2, 2-Trifluoroethanol On Water Studied By Using Third Derivatives Of Gibbs Energy, G. Journal of Molecular Liquids 2016, 224, 401–407.

2015

Koga, Y. Two-Dimensional Characterization Of The Effect Of Solute On H2O: A Thermodynamic Probing Methodology. JOURNAL OF MOLECULAR LIQUIDS 2015, 205, 31-36.
Yoshida, K. ; Westh, P. ; Inaba, A. ; Nakano, M. ; Koga, Y. Third Derivative Thermodynamic Quantities Of Aqueous Tetrahydrofuran At 25 Degrees C. JOURNAL OF MOLECULAR LIQUIDS 2015, 202, 40-45.
Sebe, F. ; Nishikawa, K. ; Koga, Y. Excess Partial Molar Absorptivity Of Aqueous Solutions Of Kcl, Kbr, Cscl And Csbr: Are There Three Universal Chromophores In The Excess Molar Absorptivity Of The $Ν$2+ $Ν$3 Band Of H2O For Aqueous Salt Solutions?. Journal of Solution Chemistry 2015, 44, 1833–1843.
Koga, Y. Erratum:“Partial Molar Quantity Of An Intensive Mother Function”[J. Chem. Phys. 137, 124503 (2012)]. The Journal of chemical physics 2015, 143, 239901.

2014

Morita, T. ; Nitta, A. ; Nishikawa, K. ; Westh, P. ; Koga, Y. Characterization Of Bf4- In Terms Of Its Effect On Water By The 1-Propanol Probing Methodology. JOURNAL OF MOLECULAR LIQUIDS 2014, 198, 211-214.
Koga, Y. ; Westh, P. ; Yoshida, K. ; Inaba, A. ; Nakazawa, Y. Gradual Crossover In Molecular Organization Of Stable Liquid H2O At Moderately High Pressure And Temperature. AIP ADVANCES 2014, 4, 097116.
Morita, T. ; Westh, P. ; Nishikawa, K. ; Koga, Y. How Much Weaker Are The Effects Of Cations Than Those Of Anions? The Effects Of K+ And Cs+ On The Molecular Organization Of Liquid H2O. JOURNAL OF PHYSICAL CHEMISTRY B 2014, 118, 8744-8749.
Yoshida, K. ; Inaba, A. ; Koga, Y. Anomalies In The Third Derivatives Of Gibbs Energy And Their Temperature Dependence In Aqueous 2-Butoxyethanol And Glycerol: On The So Called Koga Lines. JOURNAL OF SOLUTION CHEMISTRY 2014, 43, 663-674.
Koga, Y. ; Westh, P. Effects Of Some Salts On H2O As Probed By A Thermodynamic Signature Of Glycerol: Towards Understanding The Hofmeister Effects (Vii). PHYSICAL CHEMISTRY CHEMICAL PHYSICS 2014, 16, 335-344.

2013

Koga, Y. 1-Propanol Probing Methodology: Two-Dimensional Characterization Of The Effect Of Solute On H2O. PHYSICAL CHEMISTRY CHEMICAL PHYSICS 2013, 15, 14548-14565.
Koga, Y. 1-Propanol Probing Methodology: Two-Dimensional Characterization Of The Effect Of Solute On H2O. PHYSICAL CHEMISTRY CHEMICAL PHYSICS 2013, 15, 14548-14565.
Koga, Y. ; Sebe, F. ; Nishikawa, K. Effects Of Tetramethyl- And Tetraethylammonium Chloride On H2O: Calorimetric And Near-Infrared Spectroscopic Study. JOURNAL OF PHYSICAL CHEMISTRY B 2013, 117, 877-883.

2012

Koga, Y. To Curve-Fit Or Not To Curve-Fit: Comments On ``water Structure Enhancement In Water-Rich Binary Solvent Mixtures. Part Ii. The Excess Partial Molar Heat Capacity Of The Water'' By Yizhak Marcus In This Journal. JOURNAL OF MOLECULAR LIQUIDS 2012, 175, 59-60.
Koga, Y. ; Kondo, T. ; Miyazaki, Y. ; Inaba, A. The Effects Of Sulphate And Tartrate Ions On The Molecular Organization Of Water: Towards Understanding The Hofmeister Series (Vi). JOURNAL OF SOLUTION CHEMISTRY 2012, 41, 1388-1400.
Morita, T. ; Westh, P. ; Nishikawa, K. ; Koga, Y. Effects Of Ethanol And Dimethyl Sulfoxide On The Molecular Organization Of H2O As Probed By 1-Propanol. JOURNAL OF PHYSICAL CHEMISTRY B 2012, 116, 7328-7333.
Kondo, T. ; Miyazaki, Y. ; Inaba, A. ; Koga, Y. Effects Of Carboxylate Anions On The Molecular Organization Of H2O As Probed By 1-Propanol. JOURNAL OF PHYSICAL CHEMISTRY B 2012, 116, 3571-3577.
Sebe, F. ; Nishikawa, K. ; Koga, Y. Spectrum Of Excess Partial Molar Absorptivity. Part Ii: A Near Infrared Spectroscopic Study Of Aqueous Na-Halides. Physical Chemistry Chemical Physics 2012, 14, 4433.
Kondo, T. ; Miyazaki, Y. ; Inaba, A. ; Koga, Y. Effects Of Carboxylate Anions On The Molecular Organization Of H 2 O As Probed By 1-Propanol. The Journal of Physical Chemistry B 2012, 120309070715002.
Koga, Y. Partial Molar Quantity Of An Intensive Mother Function. The Jjournal of Chemical Physics 2012, 137.

2011

Westh, P. ; Rasmussen, E. Lumby; Koga, Y. Intermolecular Interactions In Ternary Glycerol–Sample–H2O: Towards Understanding The Hofmeister Series (V). Journal of Solution Chemistry 2011, 40, 93 - 105.
Koga, Y. ; Westh, P. ; Nishikawa, K. ; Subramanian, S. Is A Methyl Group Always Hydrophobic? Hydrophilicity Of Trimethylamine- N -Oxide, Tetramethyl Urea And Tetramethylammonium Ion. The Journal of Physical Chemistry B 2011, 115, 2995 - 3002.
Koga, Y. ; Westh, P. ; Nishikawa, K. ; Subramanian, S. Is A Methyl Group Always Hydrophobic? Hydrophilicity Of Trimethylamine- N -Oxide, Tetramethyl Urea And Tetramethylammonium Ion. The Journal of Physical Chemistry B 2011, 115, 2995 - 3002.
Yoshida, K. ; Baluja, S. ; Inaba, A. ; Tozaki, K. -ichi; Koga, Y. Experimental Determination Of A Third Derivative Of G. (Iii): Differential Pressure Perturbation Calorimetry (Ii). JOURNAL OF SOLUTION CHEMISTRY 2011, 40, 1271-1278.
Sou, K. ; Nishikawa, K. ; Koga, Y. ; Tozaki, K. -ichi High-Resolution Calorimetry On Thermal Behavior Of Glycerol (I): Glass Transition, Crystallization And Melting, And Discovery Of A Solid-Solid Transition. CHEMICAL PHYSICS LETTERS 2011, 506, 217-220.
Yoshida, K. ; Baluja, S. ; Inaba, A. ; Tozaki, K. -ichi; Koga, Y. Experimental Determination Of A Third Derivative Of G. (Iii): Differential Pressure Perturbation Calorimetry (Ii). Journal of Solution Chemistry 2011, 40, 1271 - 1278.
Yoshida, K. ; Baluja, S. ; Inaba, A. ; Tozaki, K. -ichi; Koga, Y. Experimental Determination Of A Third Derivative Of G. (Iii): Differential Pressure Perturbation Calorimetry (Ii). Journal of Solution Chemistry 2011, 40, 1271 - 1278.
Sou, K. ; Nishikawa, K. ; Koga, Y. ; Tozaki, K. -ichi High-Resolution Calorimetry On Thermal Behavior Of Glycerol (I): Glass Transition, Crystallization And Melting, And Discovery Of A Solid–Solid Transition. Chemical Physics Letters 2011, 506, 217 - 220.
Sou, K. ; Nishikawa, K. ; Koga, Y. ; Tozaki, K. -ichi High-Resolution Calorimetry On Thermal Behavior Of Glycerol (I): Glass Transition, Crystallization And Melting, And Discovery Of A Solid–Solid Transition. Chemical Physics Letters 2011, 506, 217 - 220.
Yoshida, K. ; Baluja, S. ; Inaba, A. ; Koga, Y. Acceleration Of The Effect Of Solute On The Entropy-Volume Cross Fluctuation Density In Aqueous 2-Butoxyethanol, 1-Propanol, And Glycerol: The Fourth Derivative Of Gibbs Energy. The Journal of Chemical Physics 2011, 134, 214502.
Yoshida, K. ; Baluja, S. ; Inaba, A. ; Koga, Y. Acceleration Of The Effect Of Solute On The Entropy-Volume Cross Fluctuation Density In Aqueous 2-Butoxyethanol, 1-Propanol, And Glycerol: The Fourth Derivative Of Gibbs Energy. The Journal of Chemical Physics 2011, 134, 214502.
Westh, P. ; Rasmussen, E. Lumby; Koga, Y. Intermolecular Interactions In Ternary Glycerol–Sample–H2O: Towards Understanding The Hofmeister Series (V). Journal of Solution Chemistry 2011, 40, 93 - 105.

2010

Koga, Y. ; Westh, P. ; Inaba, A. ; Sou, K. ; Tozaki, K. -ichi Erratum To: Experimental Determination Of Third Derivative Of The Gibbs Free Energy, G Ii: Differential Pressure Perturbation Calorimetry. Journal of Solution Chemistry 2010, 39, 589 - 590.
Koga, Y. ; Westh, P. ; Inaba, A. ; Sou, K. ; Tozaki, K. -ichi Experimental Determination Of Third Derivative Of The Gibbs Free Energy, G Ii: Differential Pressure Perturbation Calorimetry. Journal of Solution Chemistry 2010, 39, 431 - 440.
Koga, Y. ; Westh, P. ; Inaba, A. ; Sou, K. ; Tozaki, K. -ichi. Erratum To: Experimental Determination Of Third Derivative Of The Gibbs Free Energy, G Ii: Differential Pressure Perturbation Calorimetry. Journal of Solution Chemistry 2010, 39, 589 - 590.
Koga, Y. ; Westh, P. ; Inaba, A. ; Sou, K. ; Tozaki, K. -ichi. Experimental Determination Of Third Derivative Of The Gibbs Free Energy, G Ii: Differential Pressure Perturbation Calorimetry. Journal of Solution Chemistry 2010, 39, 431 - 440.

2009

Koga, Y. ; Sebe, F. ; Minami, T. ; Otake, K. ; Saitow, K. ; Nishikawa, K. Spectrum Of Excess Partial Molar Absorptivity. I. Near Infrared Spectroscopic Study Of Aqueous Acetonitrile And Acetone. Journal of Physical Chemistry B 2009, 113, 11928-11935.
Kato, H. ; Miki, K. ; Mukai, T. ; Nishikawa, K. ; Koga, Y. Hydrophobicity/hydrophilicity Of 1-Butyl-2,3-Dimethyl And 1-Ethyl-3-Methylimodazolium Ions: Toward Characterization Of Room Temperature Ionic Liquids. Journal of Physical Chemistry B 2009, 113, 14754-14760.
Koga, Y. ; Westh, P. ; Moriya, Y. ; Kawasaki, K. ; Atake, T. High Temperature End Of The So-Called "koga Line": Anomalies In Temperature Derivatives Of Heat Capacities. Journal of Physical Chemistry B 2009, 113, 5885-5890.
Koga, Y. Pattern Dynamics By Shoji Makishima – A Unique Approach. In Handbook of Self-Organization; Kunitake, K. ; Handbook of Self-Organization; NTS Publication: Tpkyo, 2009.

2008

Koga, Y. ; Miyazaki, Y. ; Nagano, Y. ; Inaba, A. Mixing Schemes In A Urea-H2O System: A Differential Approach In Solution Thermodynamics. Journal of Physical Chemistry B 2008, 112, 11341-11346.
Kato, H. ; Nishikawa, K. ; Murai, H. ; Morita, T. ; Koga, Y. Chemical Potentials In Aqueous Solutions Of Some Ionic Liquids With The 1-Ethyl-3-Methylimidazolium Cation. Journal of Physical Chemistry B 2008, 112, 13344-13348.
Kato, H. ; Nishikawa, K. ; Koga, Y. Relative Hydrophobicity And Hydrophilicity Of Some "ionic Liquid" Anions Determined By The 1-Propanol Probing Methodology: A Differential Thermodynamic Approach. Journal of Physical Chemistry B 2008, 112, 2655-2660.
Westh, P. ; Inaba, A. ; Koga, Y. Experimental Determination Of The Third Derivative Of G. I. Enthalpic Interaction. Journal of Chemical Physics 2008, 129, 4.
Miki, K. ; Westh, P. ; Koga, Y. Interactions Of Na-Salts And I-Propanol In 1-Propanol-Na-Salt-H2O Systems: Toward An Understanding The Hofmeister Series (Iv). Journal of Physical Chemistry B 2008, 112, 4680-4686.

2007

Nishikawa, K. ; Wang, S. L. ; Katayanagi, H. ; Hayashi, S. ; Hamaguchi, H. O. ; Koga, Y. ; Tozaki, K. I. Melting And Freezing Behaviors Of Prototype Ionic Liquids, 1-Butyl-3-Methylimidazolium Bromide And Its Chloride, Studied By Using A Nano-Watt Differential Scanning Calorimeter. Journal of Physical Chemistry B 2007, 111, 4894-4900.
Koga, Y. ; Nishikawa, K. ; Westh, P. Relative Hydrophobicity/hydrophilicity Of Fructose, Glucose, Sucrose, And Trehalose As Probed By 1-Propanol: A Differential Approach In Solution Thermodynamics. Journal of Physical Chemistry B 2007, 111, 13943-13948.
Koga, Y. An Attempt At Understanding Pattern Dynamics Via Solution Thermodynamics. Reports of Pattern Dynamics 2007, 1.
Koga, Y. "solution Thermodynamics And Its Application To Aqueous Solutions: A Differential Approach."; 2007.
Koga, Y. "what Some Anions Do To H2O? : Towards Understanding The Hofmeister Series." The Jscta Award Winning Review. Netsu Sokutei (J. Jpn. Soc. Calor. Therm. Anal.) 2007, 34, 10.

2006

Koga, Y. ; Katayanagi, H. ; Davies, J. V. ; Kato, H. ; Nishikawa, K. ; Westh, P. The Effects Of Chloride Salts Of Some Cations On The Molecular Organization Of H2O. Towards Understanding The Hofmeister Series. Ii. Bulletin of the Chemical Society of Japan 2006, 79, 1347-1354.
Perera, A. ; Sokolic, F. ; Almasy, L. ; Koga, Y. Kirkwood-Buff Integrals Of Aqueous Alcohol Binary Mixtures. Journal of Chemical Physics 2006, 124, 9.
Tozaki, K. ; Kido, Y. ; Koga, Y. ; Nishikawa, K. Novel Method Of Measuring Heat Capacity Of Supercritical Fluid Using Peltier Elements. Japanese Journal of Applied Physics Part 1-Regular Papers Brief Communications & Review Papers 2006, 45, 269-273.
Westh, P. ; Kato, H. ; Nishikawa, K. ; Koga, Y. Toward Understanding The Hofmeister Series. 3. Effects Of Sodium Halides On The Molecular Organization Of H2O As Probed By 1-Propanol. Journal of Physical Chemistry A 2006, 110, 2072-2078.
Nakakoshi, M. ; Ishihara, S. ; Utsumi, H. ; Seki, H. ; Koga, Y. ; Nishikawa, K. Anomalous Dynamic Behavior Of Ions And Water Molecules In Dilute Aqueous Solution Of 1-Butyl-3-Methylimidazolium Bromide Studied By Nmr. Chemical Physics Letters 2006, 427, 87-90.
Koga, Y. Invitation To Higher Order Derivatives Of G. Preface. Netsu Solkutei (J. Jpn. Soc. calor. Therm. Anal.) 2006, 33.

2005

Perera, A. ; Sokolic, F. ; Almasy, L. ; Westh, P. ; Koga, Y. On The Evaluation Of The Kirkwood-Buff Integrals Of Aqueous Acetone Mixtures. Journal of Chemical Physics 2005, 123, 11.
Parsons, M. T. ; Koga, Y. Hydration Number Of Glycine In Aqueous Solution: An Experimental Estimate. Journal of Chemical Physics 2005, 123, 6.
Kanemaru, M. ; Shiraishi, Y. ; Koga, Y. ; Toshima, N. Calorimetric Study On Self-Assembling Of Two Kinds Of Monometallic Nanoparticles In Solution. Journal of Thermal Analysis and Calorimetry 2005, 81, 523-527.
Siu, D. ; Koga, Y. Fluctuation Functions In Aqueous Nacl And Urea. Journal of Physical Chemistry B 2005, 109, 16886-16890.
Toshima, N. ; Kanemaru, M. ; Shiraishi, Y. ; Koga, Y. Spontaneous Formation Of Core/shell Bimetallic Nanoparticles: A Calorimetric Study. Journal of Physical Chemistry B 2005, 109, 16326-16331.
Miki, K. ; Westh, P. ; Koga, Y. Hydrophobicity Vs Hydrophilicity: Effects Of Poly(Ethylene Glycol) And Tert-Butyl Alcohol On H2O As Probed By 1-Propanol. Journal of Physical Chemistry B 2005, 109, 19536-19541.
Miki, K. ; Westh, P. ; Nishikawa, K. ; Koga, Y. Effect Of An "ionic Liquid" Cation, 1-Butyl-3-Methylimidazolium, On The Molecular Organization Of H2O. Journal of Physical Chemistry B 2005, 109, 9014-9019.
Liltorp, K. ; Westh, P. ; Koga, Y. Thermodynamic Properties Of Water In The Water-Poor Region Of Binary Water Plus Alcohol Mixtures. Canadian Journal of Chemistry-Revue Canadienne De Chimie 2005, 83, 420-429.

2004

Koga, Y. ; Westh, P. ; Davies, J. V. ; Miki, K. ; Nishikawa, K. ; Katayanagi, H. Toward Understanding The Hofmeister Series. 1. Effects Of Sodium Salts Of Some Anions On The Molecular Organization Of H2O. Journal of Physical Chemistry A 2004, 108, 8533-8541.
Koga, Y. ; Westh, P. ; Nishikawa, K. Effects Of Na2So4 And Naclo4 On The Molecular Organization Of H2O. Journal of Physical Chemistry A 2004, 108, 1635-1637.
Katayanagi, H. ; Nishikawa, K. ; Shimozaki, H. ; Miki, K. ; Westh, P. ; Koga, Y. Mixing Schemes In Ionic Liquid-H2O Systems: A Thermodynamic Study. Journal of Physical Chemistry B 2004, 108, 19451-19457.
Kato, H. ; Katayanagi, H. ; Koga, Y. ; Nishikawa, K. Novel Detection Method Of Liquid-Liquid Phase Separation. Japanese Journal of Applied Physics Part 1-Regular Papers Short Notes & Review Papers 2004, 43, 8217-8218.
Koga, Y. ; Nishikawa, K. ; Westh, P. "icebergs" Or No "icebergs" In Aqueous Alcohols?: Composition-Dependent Mixing Schemes. Journal of Physical Chemistry A 2004, 108, 3873-3877.
Koga, Y. Determination Of Partial Molar Quantities. In Comprehensive Handbook of Calorimetry and Thermal Analysis; Sorai, M. ; Comprehensive Handbook of Calorimetry and Thermal Analysis; John Wiley & Sons: New York, 2004.
Koga, Y. ; Purssell, R. A. ; Lynd, L. Irationality Of The Present Clinical Use Of Osmolarity: Applicable Physical Chemistry Principles And Recommendations To Improve The Validity Of Corrent Practices. Toxocology Review 2004, 23.
Koga, Y. Thermodynamic Quantities Characteristic Of Multi-Component System. In Comprehensive Handbook of Calorimetry and Thermal Analysis; Sorai, M. ; Comprehensive Handbook of Calorimetry and Thermal Analysis; John Wiley & Sons: New York, 2004.
Purssell, R. A. ; Lynd, L. ; Koga, Y. The Use Of Serum Osmole Gap As Screening Test For The Presence Of Exogenous Substances: A Review Of The Literature. Toxocology Review 2004, 23.

2003

Parsons, M. T. ; Lau, F. W. ; Yee, E. G. M. ; Koga, Y. Excess Chemical Potentials And Partial Molar Enthalpies In Aqueous 1,2-And 1,3-Propanediols At 25 Degrees C. Journal of Solution Chemistry 2003, 32, 137-153.
Koga, Y. ; Westh, P. ; Nishikawa, K. Excess Partial Molar Entropy Of Alkane-Mono-Ols In Aqueous Solutions At 25 Degrees C. Canadian Journal of Chemistry-Revue Canadienne De Chimie 2003, 81, 150-155.
Koga, Y. Mixing Schemes In Binary Aqueous Solutions Of Non-Electrolytes. An Invited Review. Netsu Sokutei (J. Jpn. Soc. Calor. Therm. Anal.) 2003, 30.
Koga, Y. Effect Of Ethylene Glycol On The Molecular Organization Of H2O In Comparison With Methanol And Glycerol: A Calorimetric Study. Journal of Solution Chemistry 2003, 32, 803-818.
Ralloff, K. P. G. ; Westh, P. ; Purssell, R. A. ; Pudek, M. ; Koga, Y. Non-Ideality Of Methanol Solution’S Of Artificial Serum In The Mole Fraction Range From 5 X 10(-4) To 5 X 10(-3) At 25 Degrees C. Fluid Phase Equilibria 2003, 207, 301-317.
Hu, J. H. ; Haynes, C. A. ; Wu, A. H. Y. ; Cheung, C. M. W. ; Chen, M. M. ; Yee, E. G. M. ; Ichioka, T. ; Nishikawa, K. ; Westh, P. ; Koga, Y. Chemical Potential And Concentration Fluctuation In Some Aqueous Alkane-Mono-Ols At 25 Degrees C. Canadian Journal of Chemistry-Revue Canadienne De Chimie 2003, 81, 141-149.
Cheung, C. M. W. ; Chan, K. P. Y. ; Koga, Y. Excess Chemical Potential And Partial Molar Enthalpy Of 2-Iso-Butoxyethanol In Aqueous Solution At 20 Degrees C. Thermochimica Acta 2003, 397, 75-80.

2002

Parsons, M. T. ; Koga, Y. Interactions In 1-Propanol-(1,2-And 1,3-)Propanediol-H2O: The Effect Of Hydrophobic Vs Hydrophilic Moiety On The Molecular Organization Of H2O. Journal of Physical Chemistry B 2002, 106, 7090-7095.
Andersen, K. B. ; Koga, Y. ; Westh, P. A Differential Vapor-Pressure Equipment For Investigations Of Biopolymer Interactions. Journal of Biochemical and Biophysical Methods 2002, 50, 269-288.
Koga, Y. Mixing Schemes In Ternary Aqueous Solutions - Thermodynamic Approach. Journal of Thermal Analysis and Calorimetry 2002, 69, 705-716.

2001

Chen, D. H. C. ; Liu, A. P. C. ; Koga, Y. Excess Partial Molar Enthalpy Of 1-Propanol In 1-Propanol-Acetone (Or Tetramethyl Urea)-H2O At 25 Degrees C: Effect Of Acetone (Or Tetramethyl Urea) On H2O. Fluid Phase Equilibria 2001, 189, 31-38.
Koga, Y. ; Kasahara, Y. ; Yoshino, K. ; Nishikawa, K. Mixing Schemes For Aqueous Dimethyl Sulfoxide: Support By X-Ray Diffraction Data. Journal of Solution Chemistry 2001, 30, 885-893.
Matsuo, H. ; Koga, Y. ; Sawamura, S. Solubility Of Cesium Chloride In Water Under High Pressures. Fluid Phase Equilibria 2001, 189, 1-11.
Parsons, M. T. ; Westh, P. ; Davies, J. V. ; Trandum, C. ; To, E. C. H. ; Chiang, W. M. ; Yee, E. G. M. ; Koga, Y. A Thermodynamic Study Of 1-Propanol-Glycerol-H2O At 25 Degrees C: Effect Of Glycerol On Molecular Organization Of H2O. Journal of Solution Chemistry 2001, 30, 1007-1028.
Hu, J. H. ; Chiang, W. M. D. ; Westh, P. ; Chen, D. H. C. ; Haynes, C. A. ; Koga, Y. Additive Effect Of 1-Propanol And 2-Propanol On Molecular Organization Of H2O In The Water-Rich Region: Excess Chemical Potential, Partial Molar Enthalpy And Volume Of 1-Propanol In 1-Propanol-2-Propanol-H2O At 25 Degrees C. Bulletin of the Chemical Society of Japan 2001, 74, 809-816.
Westh, P. ; Trandum, C. ; Koga, Y. Binding Of Small Alcohols To A Lipid Bilayer Membrane: Does The Partitioning Coefficient Express The Net Affinity?. Biophysical Chemistry 2001, 89, 53-63.
Suzuki, Y. ; Matsuo, H. ; Koga, Y. ; Mukae, K. ; Kawakita, T. ; Sawamura, S. Effects Of Pressure And Temperature On The Solubility Of Monosodium L-Glutamate Monohydrate In Water. High Pressure Research 2001, 21, 93-104.

2000

Nikolova, P. V. ; Duff, S. J. B. ; Westh, P. ; Haynes, C. A. ; Kasahara, Y. ; Nishikawa, K. ; Koga, Y. A Thermodynamic Study Of Aqueous Acetonitrile: Excess Chemical Potentials, Partial Molar Enthalpies, Entropies And Volumes, And Fluctuations. Canadian Journal of Chemistry-Revue Canadienne De Chimie 2000, 78, 1553-1560.
Koga, Y. ; Tamura, K. Fluctuations In Water, Aqueous Tert-Butanol And 2-Butoxyethanol: Amplitude And Wavelength Of Fluctuation. Netsu Sokutei (J. Jpn. Soc. calor. Therm. Anal.) 2000, 27.
Atake, T. ; Kawaji, H. ; Tojo, T. ; Kawasaki, K. ; Ootsuka, Y. ; Kato, M. ; Koga, Y. Heat Capacities Of Isomeric 2-Butoxyethanol From 13 To 300 K: Fusion And Glass Transition. Bull. Chem. Soc. Japan 2000, 73.
Chen, D. H. C. ; Chu, P. M. ; Tanaka, S. H. ; To, E. C. H. ; Koga, Y. Excess Chemical Potentials, Partial Molar Enthalpies And Entropies In Binary Aqueous Acetone And Tetramethyl Urea At 25 Degrees C. Fluid Phase Equilibria 2000, 175, 35-43.
To, E. C. H. ; Westh, P. ; Trandum, C. ; Hvidt, A. ; Koga, Y. Interactions In D-Fructose-1-Propanol-H2O: The Effect Of D-Fructose On The Molecular Organization Of Liquid H2O. Fluid Phase Equilibria 2000, 171, 151-164.
Tamura, K. ; Hu, J. H. ; Trandum, C. ; Westh, P. ; Haynes, C. A. ; Koga, Y. Mixing Scheme Of Aqueous Butan-1-Ol In The Water-Rich Region At 25 Degrees C: Excess Chemical Potential, Partial Molar Enthalpy, Entropy And Volume, Heat Capacity Compressibility And Thermal Expansivity. Physical Chemistry Chemical Physics 2000, 2, 355-359.

1999

To, E. C. H. ; Davies, J. V. ; Tucker, M. ; Westh, P. ; Trandum, C. ; Suh, K. S. H. ; Koga, Y. Excess Chemical Potentials, Excess Partial Molar Enthalpies, Entropies, Volumes, And Isobaric Thermal Expansivities Of Aqueous Glycerol At 25 Degrees C. Journal of Solution Chemistry 1999, 28, 1137-1157.
Tamura, K. ; Osaki, A. ; Koga, Y. Compressibilities Of Aqueous Tert-Butanol In The Water-Rich Region At 25 Degrees C: Partial Molar Fluctuations And Mixing Schemes. Physical Chemistry Chemical Physics 1999, 1, 121-126.
Mizuno, K. ; Ochi, T. ; Shimada, S. ; Nishimura, Y. ; Maeda, S. ; Koga, Y. Magnetic Susceptibility Of Aqueous Tert-Butanol. Physical Chemistry Chemical Physics 1999, 1, 133-135.
Koga, Y. Fluctuations In Aqueous Methanol, Ethanol, And Propan-1-Ol: Amplitude And Wavelength Of Fluctuation. Canadian Journal of Chemistry-Revue Canadienne De Chimie 1999, 77, 2039-2045.
Matsuo, H. ; To, E. C. H. ; Wong, D. C. Y. ; Sawamura, S. ; Taniguchi, Y. ; Koga, Y. Excess Partial Molar Enthalpy Of 1-Propanol In 1-Propanol-Nacl-H2O At 25 Degrees C: The Effect Of Nacl On Molecular Organization Of H2O. Journal of Physical Chemistry B 1999, 103, 2981-2983.

1998

Westh, P. ; Haynes, C. A. ; Koga, Y. How Dilute Is The Henry’S Law Region? Ii. Journal of Physical Chemistry B 1998, 102, 4982-4987.
Trandum, C. ; Westh, P. ; Haynes, C. A. ; Koga, Y. Intermolecular Interactions In Tert-Butyl Alcohol Dimethyl Sulfoxide H2O: Chemical Potentials, Partial Molar Entropies And Volumes. Journal of Physical Chemistry B 1998, 102, 5182-5195.
To, E. C. H. ; Hu, J. H. ; Haynes, C. A. ; Koga, Y. Interactions In 1-Propanol-Urea-H2O: Chemical Potentials, Partial Molar Enthalpies, And Entropies At 25 Degrees C. Journal of Physical Chemistry B 1998, 102, 10958-10965.
Xu, Y. N. ; Koga, Y. Light Scattering Study On Sol-Gel Transformation Of Sio2 Colloid At Extremely High Concentrations. Clays and Clay Minerals 1998, 46, 161-166.

1997

Koga, Y. ; Westh, P. ; Trandum, C. ; Haynes, C. A. ’Intermolecular Interactions’ In Aqueous Solutions Of Three Components Including Lysozyme. Fluid Phase Equilibria 1997, 136, 207-221.
Westh, P. ; Koga, Y. Intermolecular Interactions Of Lysozyme And Small Alcohols: A Calorimetric Investigation. Journal of Physical Chemistry B 1997, 101, 5755-5758.

1996

Koga, Y. ; Westh, P. Partial Molar Fluctuations In Aqueous 2-Butoxyethanol. Bulletin of the Chemical Society of Japan 1996, 69, 1505-1508.
Westh, P. ; Koga, Y. Intermolecular Interactions In 2-Butoxyethanol-Dmso-H2O. Journal of Physical Chemistry 1996, 100, 433-438.
Koga, Y. ; Westh, P. ; Sawamura, S. ; Taniguchi, Y. Normalized Fluctuations, H2O Vs N-Hexane: Site-Correlated Percolation. Journal of Chemical Physics 1996, 105, 2028-2033.
Xu, Y. N. ; Hiew, P. L. ; Klippenstein, M. A. ; Koga, Y. Study Of A Commercial Sio2 Sol And Gel By Small Angle X-Ray Scattering: Effect Of Sample Thickness And Interpretation By Means Of Smoluchowski Scheme. Clays and Clay Minerals 1996, 44, 197-213.
Tanaka, S. H. ; Yoshihara, H. I. ; Ho, A. W. C. ; Lau, F. W. ; Westh, P. ; Koga, Y. Excess Partial Molar Enthalpies Of Alkane-Mono-Ols In Aqueous Solutions. Canadian Journal of Chemistry-Revue Canadienne De Chimie 1996, 74, 713-721.
Koga, Y. Mixing Schemes In Aqueous Solutions Of Nonelectrolytes: A Thermodynamic Approach. Journal of Physical Chemistry 1996, 100, 5172-5181.

1995

Koga, Y. ; Tamura, K. ; Murakami, S. Speeds Of Sound And Isothermal Compressibilities In The Water-Rich Region Of Aqueous 2-Butoxyethanol And 2-Butanone At 25 Degrees C. Journal of Solution Chemistry 1995, 24, 1125-1133.
Koga, Y. Fluctuations In Aqueous-Solutions Of Some Hydrophobic Solutes. Chemical Physics Letters 1995, 240, 340-344.
Xu, Y. N. ; Koga, Y. ; Strausz, O. P. Characterization Of Athabasca Asphaltenes By Small-Angle X-Ray-Scattering. Fuel 1995, 74, 960-964.
Lai, J. T. W. ; Lau, F. W. ; Robb, D. ; Westh, P. ; Nielsen, G. ; Trandum, C. ; Hvidt, A. ; Koga, Y. Excess Partial Molar Enthalpies, Entropies, Gibbs Energies, And Volumes In Aqueous Dimethylsulfoxide. Journal of Solution Chemistry 1995, 24, 89-102.
Chan, S. P. ; Fraser, D. S. ; Cheng, S. Y. S. ; Xu, Y. N. ; Koga, Y. Instability Of Sio2 Colloids And Sorption Of Ca2+ Ions. Clays and Clay Minerals 1995, 43, 478-481.
Koga, Y. ; Loo, V. J. ; Puhacz, K. T. Ionic-Conductivity In The Water-Rich Region Of Aqueous 2-Butoxyethanol. Canadian Journal of Chemistry-Revue Canadienne De Chimie 1995, 73, 1294-1297.
Koga, Y. Vapor-Pressures Of Dilute Aqueous T-Butyl Alcohol - How Dilute Is The Henrys Law Region. Journal of Physical Chemistry 1995, 99, 6231-6233.

1994

Koga, Y. ; Nishikawa, K. ; Yoshino, K. ; Tanaka, I. ; Xu, Y. N. ; Amemiya, Y. Anomalous X-Ray-Scattering From Aqueous 2-Butoxyethanol At X(Be)=0.06 Near Freezing. Chemical Physics Letters 1994, 228, 53-56.
Koga, Y. ; Tanaka, T. ; Atake, T. ; Westh, P. ; Hvidt, A. Mixing Schemes And Liquid-Solid Phase-Diagram In The Water-Rich Region Of Aqueous 2-Butoxyethanol. Bulletin of the Chemical Society of Japan 1994, 67, 2393-2397.
Xu, Y. N. ; Koga, Y. ; Watkinson, A. P. Pore-Size Distribution Of Coals And Chars From Western Canada. Fuel 1994, 73, 1797-1801.
Davies, J. V. ; Fooks, R. ; Koga, Y. Excess Partial Molar Volumes And Thermal Expansivities In The Water-Rich Region Of Aqueous 2-Butanone. Journal of Solution Chemistry 1994, 23, 339-349.

1993

Koga, Y. ; Kristiansen, J. ; Hvidt, A. Excess Partial Molar Volumes Of (Xch3(Ch2)3O(Ch2)2Oh+(1-X)H2O) In The Water-Rich Region. Journal of Chemical Thermodynamics 1993, 25, 51-56.
Lai, J. T. W. ; Kam, J. S. C. ; Lau, F. W. ; Beach, L. J. ; Koga, Y. Excess Partial Molar Enthalpies And Free-Energies In Methanol Isobutanol Mixtures At 20-Degrees-C - The Effect Of Size Difference. Thermochimica Acta 1993, 230, 39-53.
Hvidt, A. ; Koga, Y. Excess Thermodynamic Properties Of Mixtures Of 2-Butoxyethanol And Water At 25-Degrees-C. Thermochimica Acta 1993, 228, 39-46.

1992

Davies, J. V. ; Lau, F. W. ; Le, L. T. N. ; Lai, J. T. W. ; Koga, Y. Thermal Expansivities Of Aqueous-Solutions Of 2-Butoxyethanol In The Water-Rich Region - Transition Of Mixing Scheme. Canadian Journal of Chemistry-Revue Canadienne De Chimie 1992, 70, 2659-2663.
Wong, T. Y. H. ; Wongmoon, K. C. ; Beach, L. J. ; Chuang, Y. F. ; Koga, Y. Excess Partial Molar Free-Energies, Enthalpies, And Entropies In 2-Butanone-H2O Mixtures - Solute Solute Interactions. Journal of Physical Chemistry 1992, 96, 10025-10029.
Siu, W. W. Y. ; Wong, T. Y. H. ; Lai, J. T. W. ; Chong, A. ; Koga, Y. Isotope Effects On The Excess Partial Molar Enthalpies Of (Xch3(Ch2)3O(Ch2)2O(H Or D)+(1-X)(H2O Or D2O)). Journal of Chemical Thermodynamics 1992, 24, 159-165.
Koga, Y. Transition Of Mixing Scheme In The Water-Rich Region Of Aqueous 2-Butoxyethanol - Partial Molar Volumes And Their Derivatives. Journal of Physical Chemistry 1992, 96, 10466-10468.

1991

Koga, Y. Vapor-Pressures Of Aqueous 2-Butoxyethanol Solutions At 25-Degrees-C - Transitions In Mixing Scheme. Journal of Physical Chemistry 1991, 95, 4119-4126.
Siu, W. W. Y. ; Wong, T. Y. H. ; Chao, L. C. F. ; Koga, Y. Excess Partial Molar Enthalpies In The Water-Rich Region Of The Isobutyric Acid - Water-System. Canadian Journal of Chemistry-Revue Canadienne De Chimie 1991, 69, 1065-1069.

1990

Koga, Y. ; Siu, W. W. Y. ; Wong, T. Y. H. Excess Partial Molar Free-Energies And Entropies In Aqueous Tert-Butyl Alcohol-Solutions At 25-Degrees-C. Journal of Physical Chemistry 1990, 94, 7700-7706.
Lee, O. ; Koga, Y. ; Wade, A. P. Thermosonimetry Of The Phase 2-3 Transition Of Hexachloroethane. Talanta 1990, 37, 861-873.
Meichel, T. ; Dawson, P. T. ; Morrison, J. A. ; Sullivan, D. E. ; Koga, Y. Adsorption Of Ethylene On Graphite Near Saturation Wetting Transition Capillary Condensation. Langmuir 1990, 6, 1579-1584.
Koga, Y. ; Wong, T. Y. H. ; Siu, W. W. Y. Vapor-Pressure Of Aqueous Tert-Butanol In The Water-Rich Region - Transition In The Mixing Scheme. Thermochimica Acta 1990, 169, 27-38.
Koga, Y. ; Siu, W. W. Y. ; Wong, T. Y. H. Transition Of Short-Range To Medium-Range Order In Aqueous-Solution Of 2-Butoxyethanol. Journal of Physical Chemistry 1990, 94, 3879-3881.

1989

Kasza, R. V. ; Koga, Y. Trans-Cis Isomerization Of Trans-Bis(Oxalato)Diaquachromate(Iii) In Aqueous-Solutions Of Ethanol And Tert-Butanol. Inorganica Chimica Acta 1989, 162, 15-18.
Siu, W. ; Koga, Y. Excess Partial Molar Enthalpies Of 2-Butoxyethanol And Water In 2-Butoxyethanol-Water Mixtures. Canadian Journal of Chemistry-Revue Canadienne De Chimie 1989, 67, 671-676.

1988

Koga, Y. Excess Partial Molar Enthalpies Of Water In Water-Tert-Butanol Mixtures. Canadian Journal of Chemistry-Revue Canadienne De Chimie 1988, 66, 3171-3175.
Koga, Y. Excess Partial Molar Enthalpies Of Tert-Butanol In Water Tert-Butanol Mixtures. Canadian Journal of Chemistry-Revue Canadienne De Chimie 1988, 66, 1187-1193.

1987

Koga, Y. Nucleation Kinetics Of Polymorphic Transition From Phase-Ii To Phase-Iii Of Hexachloroethane - Metastability Unstability. Physica B & C 1987, 146, 408-415.
Koga, Y. Excess Partial Molar Enthalpies Of (Xh2O+(1-X)D2O) At And Below 298.15-K. Journal of Chemical Thermodynamics 1987, 19, 571-577.

1986

Koga, Y. Differential Heats Of Dilution Of Tert-Butanol Into Water Tert-Butanol Mixtures At 26.90-Degrees-C. Canadian Journal of Chemistry-Revue Canadienne De Chimie 1986, 64, 206-207.

1985

Vonk, C. G. ; Koga, Y. An X-Ray-Diffraction Study Of Nonlinear Polyethylene .2. Small-Angle Scattering Observations Near The Melting-Point. Journal of Polymer Science Part B-Polymer Physics 1985, 23, 2539-2548.

1984

Koga, Y. Growth-Kinetics Of Polymorphic Transitions In Some Molecular-Solids. Journal of Crystal Growth 1984, 66, 35-44.
Koga, Y. A Saxs Study Of Concentration Fluctuations In Tert-Butanol Water-System. Chemical Physics Letters 1984, 111, 176-180.

1981

Harrison, L. G. ; Koga, Y. ; Lassau, R. T. ; Nagao, M. ; Scott, J. C. S. Cooperative Interactions And Two-Dimensional Ordering In The Adsorption Of Hbr On Kbr. Journal of the Chemical Society-Faraday Transactions I 1981, 77, 1393-1403.
Koga, Y. A Sensitive Inexpensive Dta. Journal of Physics E-Scientific Instruments 1981, 14, 297-298.

1980

Koga, Y. Kinetic-Behavior Of Polymorphic Transition Between Phase-Alpha And Phase-Beta Of Sublimed Para-Dichlorobenzene. Molecular Crystals and Liquid Crystals 1980, 64, 51-56.

1979

Koga, Y. Premelting Of The C-Form Of Stearic-Acid. Journal of Thermal Analysis 1979, 17, 87-92.

1978

Koga, Y. ; Miura, R. M. Rate Of Polymorphic Transformation Between Phase-Ii And Phase-Iii Of Hexachloroethane. Journal of the Chemical Society-Faraday Transactions I 1978, 74, 1913-1921.

1975

Koga, Y. Critical Behavior Of Cooperative Interactions. Chemical Physics Letters 1975, 31, 571-573.