Publications


Title : Pressure-Induced Structural Phase Transition of Dense Droplet Microemulsions Studied by Small-Angle X-ray Scattering

Language: English
Type: Article
Authors: Hideki Seto, Michihiro Nagao, Youhei Kawabata and Takayoshi Takeda
Journal: Journal of Chemical Physics
ISSN: 0021-9606
Volume: 115
Number: 20
Month: 11
Year: 2001
Actual year: 2001
Pages: 9496-9502
doi:   10.1063/1.1413987
Abstract: A small-angle x-ray scattering (SAXS) study of dense water-in-oil droplet microemulsions composed of water, decane, and AOT [sodium bis(2-ethylhexyl) sulfosuccinate] was performed in order to clarify phase behavior with applied pressure and the corresponding structural phase transitions. SAXS spectra were collected for pressures between ambient pressure (0.1 MPa) and 80 MPa and droplet volume fraction, phi, from 0.40 to 0.70. With increasing phi, the mean radius of droplets decreased slightly and polydispersity increased. With increasing pressure, the droplet structure transformed to a two-phase system with coexistence of lamellar and droplet structures, independent of the droplet volume fraction. These results suggest that, with increasing pressure, the increasing inter-droplet attractive force controls the pressure variation of the structure. (C) 2001 American Institute of Physics.

"Pressure-Induced Structural Phase Transition of Dense Droplet Microemulsions Studied by Small-Angle X-ray Scattering"

Hideki Seto, Michihiro Nagao, Youhei Kawabata and Takayoshi Takeda, Journal of Chemical Physics, 115, 9496-9502 (2001)