1995 Fiscal Year Final Research Report Summary
STUDY ON MISCIBILITY OF MOLECULES IN ORIENTED MOLECULAR ASSEMBLIES BY HIGH RESOLUTION CALORIMETER
| Project/Area Number |
05403014
|
|---|
| Research Category |
Grant-in-Aid for General Scientific Research (A)
|
| Allocation Type | Single-year Grants |
|---|
| Research Field |
機能・物性・材料
|
|---|
| Research Institution | KYUSHU UNIVERSITY |
|---|
Principal Investigator |
MATSUBARA Akira FACULTY OF SCIENCE,PROFESSOR, 理学部, 教授 (90038406)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
TAKIUE Takanori FACULTY OF SCIENCE,Research Associate, 理学部, 助手 (40271100)
ARATONO Makoto FACULTY OF SCIENCE,Associate Professor, 理学部, 助教授 (20175970)
|
|---|
| Project Period (FY) |
1993 – 1995
|
| Keywords | molecular assembly / high resolution calorimeter / enthalpy of mixing / micelle / enthalpy of adsorption |
|---|
| Research Abstract |
1.The enthalpy of mixing of water and tetraethylene glycol monooctyl ether (C8E4) was precisely measured as a function of concentration of surfactant and temperature by using the high accuracy isothermal titration calorimeter. The differential enthalpies of solution of monomer and micelle and the enthalpy of micelle formation were evaluated by applying the thermodynamic relations developed to the enthalpy of mixing measured. The dissolution of pure liquid C8E4 is exothernmic and the micelle formation is endothermic, respectively. It is shown that the partial molar enthalpy of water may afford an insight into the hydration in micellar state. It was also shown that there exists the difference in values between the enthalpy of micelle formation obtained directly from calorimetry and that indirectly from the temperature dependence of critical micelle concentration.
2.The experimental method is now applied to the measurement of the enthalpy of mixing of mixed surfactant systems. Furthermore it was suggested that this calorimeter, because of its extremely high resolution, is applicable to measure directly the enthalpy of interface formation and adsorption of surfactant at the interface.
|
