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The Stability of L3 Sponge Phase in Acidic Solutions Shilpa H. Bhansali, Abds-Sami Malik, Jessica M. Jarvis, Ilke Akartuna, Daniel M. Dabbs,
 

Summary: The Stability of L3 Sponge Phase in Acidic Solutions
Shilpa H. Bhansali, Abds-Sami Malik, Jessica M. Jarvis, Ilke Akartuna, Daniel M. Dabbs,
Jeffrey D. Carbeck, and Ilhan A. Aksay*
Department of Chemical Engineering, Princeton UniVersity, Princeton, New Jersey 08544-5263
ReceiVed August 17, 2005
In the synthesis of the disordered lyotropic liquid crystalline L3 sponge phase prepared with the cosurfactants
cetylpyridinium chloride and hexanol, aqueous NaCl solution is used as the solvent. When this sponge phase is used
asthetemplateforL3 silica-phaseprocessing,wereplaceNaClwithHCltofacilitatetheacidcatalysisoftetramethoxysilane
in forming a templated silica gel, assuming that changing the solvent from NaCl(aq) to HCl(aq) of equivalent ionic
strength does not affect the stability range of the L3 phase. In this work, we confirm that changing the pH of the solvent
from neutral to acidic (with HCl) has negligible effect on the L3 phase region. Equivalent ionic strength is provided
by either NaCl(aq) or HCl(aq) solvent; therefore, a similar phase behavior is observed regardless of which aqueous
solvent is used.
Introduction
Amphiphilic surfactant molecules assemble into various
spatiallyorganizedstructuresincludingone-dimensionalspherical
micelles, two-dimensional sheetlike smectic mesophases, and
three-dimensional cubic and hexagonal matrixes.1,2 The stability
of the phases depends on the surfactant concentration, solution
composition, solution ionic strength, and temperature.1-5 Sur-

  

Source: Aksay, Ilhan A. - Department of Chemical Engineering, Princeton University

 

Collections: Materials Science