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Liquid Crystals in Ternary Polyoxyethylene Trisiloxane Surfactant - Silicone Oil - H2O System

Published online by Cambridge University Press:  10 February 2011

X. Li ,
R. M. Hill ,
L. E. Scriven  and
H. T. Davis
X. Li
Affiliation:
Department of Chemical Engineering and Materials Science, and NSF Center for Interfacial Engineering (CIE), University of Minnesota, 421 Washington Ave. SE., Minneapolis, Minnesota 55455
R. M. Hill
Affiliation:
Central Research and Development, Dow Corning Corporation, 2200 West Salzburg, Midland, Michigan 48686-0994.
L. E. Scriven
Affiliation:
Department of Chemical Engineering and Materials Science, and NSF Center for Interfacial Engineering (CIE), University of Minnesota, 421 Washington Ave. SE., Minneapolis, Minnesota 55455
H. T. Davis
Affiliation:
Department of Chemical Engineering and Materials Science, and NSF Center for Interfacial Engineering (CIE), University of Minnesota, 421 Washington Ave. SE., Minneapolis, Minnesota 55455
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Abstract

Polyethylene trisiloxane surfactants M(D′En)M (n=6, 8, 10, 12) self assemble into sheet-like structure and form various lyotropic cubic, hexagonal and lamellar liquid crystal phases in ternary trisiloxane surfactant - silicone oil - water systems. Small angle X-ray scattering (SAXS) was used to identify and characterize the liquid crystal phases. Cyclic octamethylcyclotetrasiloxane (D4), decamethyl-cyclopentasiloxane(D5) and short linear decamethyltetrasiloxane (MD2M) silicone oils facilitate the formation of liquid crystals. The structures in liquid crystals (LC) progress from zero curvature lamellar liquid crystals to higher curvature cubic liquid crystals with increasing the surfactant hydrophilic head group size. The effects of surfactant and oil concentration on the lamellar bilayer thickness and molecular packing were studied with small angle X-ray scattering.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 425: Symposium I – Liquid Crystals for Advanced Technologies , 1996 , 173
Copyright
Copyright © Materials Research Society 1996

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