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Exclusion of Spherical Particles from the Nematic Phase of Reversibly Assembled Rod-Like Particles

Published online by Cambridge University Press:  25 February 2011

Thomas L. Madden  and
Judith Herzfeld
Thomas L. Madden
Affiliation:
Department of Chemistry, Brandeis University, Waltham, MA 02254-9110
Judith Herzfeld
Affiliation:
Department of Chemistry, Brandeis University, Waltham, MA 02254-9110
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Abstract

The open-ended aggregation of amphiphilic molecules in aqueous solution generates a broadly polydisperse population of elongated particles that form a variety of partially ordered phases. Herzfeld and coworkers have shown that the phase behavior of these binary systems is well described by self-consistently combining scaled-particle theory for the effects of excluded volume in fluid dimensions, a simple cell model for the effects of excluded volume in positionally ordered dimensions, a mean-field treatment of soft-interactions, and a phenomenological model of aggregate formation. We have now extended this model to ternary systems. We find that the addition of spherical particles to a solution of rod-forming particles induces a very wide isotropic-nematic coexistence region in which a relatively dilute isotropic solution with little aggregation separates from a rather concentrated nematic solution that almost completely excludes the spherical solutes. The magnitude of this effect depends on the relative diameters of the two solutes.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 248: Symposium O – Complex Fluids , 1991 , 95
Copyright
Copyright © Materials Research Society 1992

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