Publications


Title : Effects of Temperature and Pressure on Phase Transitions in a Ternary Microemulsion System

Language: English
Type: Article
Authors: Michihiro Nagao, Hideki Seto, Youhei Kawabata and Takayoshi Takeda
Journal: Journal of Chemical Physics
ISSN: 0021-9606
Volume: 115
Number: 21
Month: 12
Year: 2001
Actual year: 2001
Pages: 10036-10044
doi:   10.1063/1.1415459
Abstract: Temperature variation experiments of small angle neutron scattering (SANS) and neutron spin echo (NSE) were carried out in order to compare effects of temperature and pressure on a structural formation in a ternary microemulsion system composed of AOT (Aerosol-OT; dioctyl sulfosuccinate sodium salt), D2O, and n-decane. From SANS measurements, a phase transition from one-phase dense water-in-oil droplet to two-phase coexistence with a lamellar and a disordered structure was observed with increasing temperature, similar to the case of pressure variation. Another phase transition was observed at a higher temperature above the lamellar phase, although such a subsequent phase transition has not been observed at higher pressure. The characteristic features of structural phase transitions by temperature and by pressure were compared by introducing a reduced temperature and pressure. The dynamical property observed from the NSE measurement was different between the high-temperature phase and the high-pressure phase. These results indicate that the mechanism of the phase transition induced by temperature is different from that by pressure. (C) 2001 American Institute of Physics.

"Effects of Temperature and Pressure on Phase Transitions in a Ternary Microemulsion System"

Michihiro Nagao, Hideki Seto, Youhei Kawabata and Takayoshi Takeda, Journal of Chemical Physics, 115, 10036-10044 (2001)