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Researcher Information

last modified:2017/05/23

Professor ASAKAWA Tsuyoshi

Mail Laboratory Website

Faculty, Affiliation

Faculty of Chemistry, Institute of Science and Engineering

College and School Educational Field

Division of Material Chemistry, Graduate School of Natural Science and Technology
Division of Material Sciences, Graduate School of Natural Science and Technology
School of Chemistry, College of Science and Engineering

Laboratory

Interface Chemistry TEL:076-234-4765 FAX:076-234-4800

Academic Background

【Academic background(Doctoral/Master's Degree)】
Kanazawa University Master 198103 Completed
【Degree】
Science

Career

Year & Month of Birth

1956/10

Academic Society


Award

Specialities

Surface Chemistry、fluorescence probe microphase separation fluorocarbon surfactant、Basic chemistry、Functional solid state chemistry

Speciality Keywords

Colloid Chemistry, Surfactant, Solution property, Fluorescence probe

Research Themes

Synthesis of novel gemini surfactants and functional organized solutions

We developed new gemini surfactants with a spacer containing disulfide linkage, and found the generation of dissymmetric gemini surfactants by the disulfide exchange between the spacer chains in mixed micellar aqueous solutions. The cationic and zwitterionic surfactants generated by the reaction of various thiol compounds resulted in the decay of molecular aggregates and the release of micellar solubilizates. These results relating to functional organized solutions linked to the cooperative investigations of the improvement in functionality of hair.

Self-assembled structures revealed by fluorescent probe methods

Research of fluorescent probes and their labeled surfactants led us into the field of the aggregate structures from the viewpoint of both micellar interior and external bulk water phase. Especially, we established the facile method for the accurate determination of micellar counterion binding by using the fluorescence quenching behavior of quinoline or acridine derivatives. The high sensitivity and ion-selective quenching provided information regarding the competitive counterion binding to the micellar surface.

Nonrandom distribution of surfactant molecules in mixed micellar systems

Fluorescence quenching behavior of pyrene using fluorocarbon quencher showed the coexistence of fluorocarbon-rich and hydrocarbon-rich micelles in aqueous solutions. The coexisting regions have been predicted by the group contribution method in thermodynamic approach. The micro-phase separation in aggregates has been investigated by various experimental methods, fluorescent probe method, NMR, AFM, SANS.

Books

Papers

  •  Generation of Fluorocarbon and Hydrocarbon Hybrid Gemini Surfactants Controlled by Micellar Miscibility Tsuyoshi Asakawa, Tadahiro Ozawa, and Akio Ohta  62 1 17-20 2013
  •  Micelle–Vesicle Transition by Cleavage of Disulfide Spacer Chain for Gemini Surfactant in Didodecyldimethylammonium Chloride Aqueous Solutions.  Toshinari Mizuhashi, T. Asakawa, A. Ohta Journal of Oleo Science 64 9 963 2015
  •  Aqueous Solution Properties of Disulfide Linked Fluorinated Gemini and Cleaved Monomeric Thiol Surfactants  Tsuyoshi Asakawa, Tadahiro Ozawa, and Akio Ohta  60 9 469-474 2011/09
  •  Aqueous Solution Behavior of Cationic Surfactants Containing Sulfide Linked Alkyl Chain  Tsuyoshi Asakawa, Syunsuke Mochizuki, and Akio Ohta  60 4 165-170 2011/04
  •  Dissymmetric Gemini Surfactants Generated by Disulfide Exchange in Mixed Micelles  Tsuyoshi Asakawa, Hirotaka Tango, Tadahiro Ozawa, and Akio Ohta  59 2 95-100 2010/02

show all

  •  Aqueous Solution Properties of Disulfide Linked Gemini and Cleaved Monomeric Thiol Surfactants. Asakawa T. 57(4)  243-249 2008/04
  •  New Florescent Probes Applicable to Aggregates of Fluorocarbon Surfactants. T. Ozawa, T. Asakawa, A. Ohta, and S.Miyagishi 56 11 587-593 2007/11
  •  Contrast Variation SANS Investigation of Composition Distributions in Mixed Surfactant Micelles Mats Almgren,,Vasil M. Garamus, Tsuyoshi Asakawa, and Nan Jiang 111 25 7133-7141 2007/05
  •  One-pot aerosol synthesis of ordered hierarchical mesoporous core-shell silica nanoparticles CHEMICAL COMMUNICATIONS 14 1630 2004
  •  Phase Behavior and Phase Structure of a Cationic Fluorosurfactant in Water. LANGMUIR 16 3 1042 2000/10
  •  Micellar growth of N-dodecanoyl-alaninates with different counterions and its quantitative relation with some factors. Colloids Surf. A, 2002,197, 125. 197 125 2002/01
  •  Appearance of Pure Fluorocarbon Micelles Surveyed by Fluorescence Quenching of Amphiphilic Quinoline Derivatives in Fluorocarbon and Hydrocarbon Surfactants Mixtures. 20 17 pp 2004/08
  •  Composition of Mixed Hydrocarbon and Fluorocarbon Surfactant Adsorbed Layers at Mica-Solution Interfaces 19 13 5266-5272 2003/07
  •  Salt Effect on Critical Micelle Concentrations of Nonionic Surfactants, N-Acyl-N-methylglucamides(MEGA-n). J. Colloid Interface Sci. 238 1 91 2001/01
  •  Self-assembly of hydrocarbon and fluorocarbon surfactants and their mixtures at the mica-solution interface. LANGMUIR 17 17 5283 2001/09
  •  Aqueous Solution Properties of Pyridinium-type Perfluorinated Surfactants and Simulation of Mixture CMC. J. Colloid Interface Sci. 240 1 365 2001/04
  •  Convenient Estimation for Counterion Dissociation of Cationic Micelles Using Chloride-Sensitive Fluorescence Probe J. Colloid Interface Sci. 242 2 284 2001/08
  •  Aggregation Behavior of Cationic Fluorosurfactants in Water and Salt Solutions. A Cryo-TEM Survey. J. Phys. Chem. B 103 42 9237 1999/10
  •  Demicellization of Sodium Perfluorooctanoate and Dodecyl Sulfate Mixtures Revealed by Pyrene Fluorescence Quenching. LANGMUIR 15 10 3464 1999/05
  •  Diffusion Coefficient of Micelles Composed of Fluorocarbon Surfactants with Cyclic Voltammetry. LANGMUIR 14 25 7091 1998/12
  •  Synergistic Solubilization of Decafluorobiphenyl by Micelles of Fluorocarbon Surfactants. J. of Surfactants & Detergents 1 2 958 1998/02
  •  Pyrene Fluorescence-quenching by 1,1,2,2-Tetrahydroheptadecafluorodecyl Pyridinium Chloride in Mixed, Fluorocarbon and Hydrocarbon, Micelles. . J. Jpn. Oil Chem. Soc. 46 7 777 1997/07
  •  Fluorescence quenching studies of micellisation and solubilization in fluorocarbon-hydrocarbon surfactant mixtures. LANGMUIR 13 17 4535 1997/09

Conference Presentations

Arts and Fieldwork

Patent

Theme to the desired joint research

○Surface treatment using surfactant

Grant-in-Aid for Scientific Research

Classes (Bachelors)

○World of Chemistry(2017)
○World of Chemistry(2017)
○Chemistry for Education(2017)
○Chemical Thermodynamics(2017)
○Laboratory Course I(2017)
○Chemistry for Education(2017)
○Information Processing Exercise(2017)
○Exercise I in Applied Chemistry(2017)
○Laboratory Course I(2017)
○World of Chemistry(2016)
○Information Processing Exercise(2016)
○Chemical Thermodynamics(2016)
○Exercise I in Applied Chemistry(2016)
○Laboratory Course I(2016)
○Exercise II in Applied Chemistry(2016)
○Physical Chemistry I for Application(2016)
○Laboratory Course I(2016)

Classes (Graduate Schools)

○Introduction of Energy and Environmental Program(2017)
○Solution Theory of Molecular Association(2017)
○Solution Theory of Molecular Association(2017)
○Advanced Practice(2017)
○Solution Theory of Molecular Association(2017)
○Solution Theory of Molecular Association(2017)
○Applied Chemical Thermodynamics(2017)
○Physical Chemistry of Self-Assembly(2017)
○Introduction of Energy and Environmental Program(2016)
○Physical Chemistry of Self-Assembly(2016)
○Applied Chemical Thermodynamics(2016)
○Solution Theory of Molecular Association(2016)

International Project

International Students

Lecture themes

Others (Social Activities)

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