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/aolc. Shape transitions in the surface aggregates were observed on changing the counterion between chloride, bromide, and salicylate.
|Original language||English (US)|
|Number of pages||8|
|State||Published - Dec 1 1999|
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Surfaces and Interfaces