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Surface Micellization Patterns of Quaternary Ammonium Surfactants on Mica
 

Summary: Surface Micellization Patterns of Quaternary Ammonium
Surfactants on Mica
Heather N. Patrick,, Gregory G. Warr,*,, Srinivas Manne,| and
Ilhan A. Aksay
School of Chemistry, University of Sydney, Sydney, New South Wales, 2006 Australia,
Princeton Materials Institute, Princeton University, Princeton, New Jersey 08544,
Rhone-Poulenc/CNRS Complex Fluids Laboratory, Cranbury, New Jersey 08512, and
Department of Physics, University of Arizona, Tucson, Arizona 85721
Received November 17, 1998
The microscopic equilibrium structures of adsorbed films of quaternary ammonium surfactants on mica
have been investigated by noncontact atomic force microscopy imaging as a function of alkyl chain length
and headgroup structure. Spherical and cylindrical surface micelles were observed; these were found to
be related to bulk solution self-assembly and the surfactant packing parameter, v/a0lc. Shape transitions
inthesurfaceaggregateswereobservedonchangingthecounterionbetweenchloride,bromide,andsalicylate.
Introduction
To understand observable properties of adsorbed films
of surface-active agents on solids, we require an under-
standing of the microscopic nature of these interfaces.
The first proposal of surface hemimicelles was in 1955;1
since then the structure of adsorbed films of surfactants

  

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

 

Collections: Materials Science