Molecular organization of surfactants at solid-liauid interfaces

Srinivas Manne, Hermann E. Gaubt

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Abstract

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.

Original languageEnglish (US)
Pages (from-to)1480-1482
Number of pages3
JournalScience
Volume270
Issue number5241
Publication statusPublished - Dec 1 1995
Externally publishedYes

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ASJC Scopus subject areas

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