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Science 1 December 1995:
Vol. 270. no. 5241, pp. 1480 - 1482
DOI: 10.1126/science.270.5241.1480
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Reports

Molecular Organization of Surfactants at Solid-Liquid Interfaces

Srinivas Manne (1) and Hermann E. Gaub (2)

Interactions between surfactant solutions and solid surfaces play a key role in technologically important processes such as colloidal stabilization, ore flotation, and soil removal; however, the interfacial aggregation of surfactant molecules is not yet well understood. Direct images of surfactant aggregates at solid surfaces in aqueous solutions were obtained with atomic force microscopy. The resulting structures for quaternary ammonium surfactants (above the critical micelle concentration) are consistent with half-cylinders on crystalline hydrophobic substrates, full cylinders on mica, and spheres on amorphous silica. These structures-surprisingly different from earlier models-appear to result from a compromise between the natural free curvature as defined by intermolecular interactions and the constraints imposed by specific surfactant-surface interactions. Such interfacial aggregates can potentially be used to pattern surfaces at nanometer-length scales.


Department of Physics E22, Technische Universität München, 85748 Garching, Germany.
(1) To whom correspondence should be addressed. Present address: Princeton Materials Institute, 70 Prospect Avenue, Princeton University, Princeton, NJ 08540, USA. E-mail: smanne{at}phoenix.princeton.edu
(2) Present address: Ludwig Maximilian Universität, Lehrstuhl für Angewandte Physik, Amalienstrasse 54, 80799 Munich, Germany.


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