HYDRODYNAMIC MODES OF SOLUBLE SURFACTANT FILMS

C Y D LU, Michael Cates

Research output: Contribution to journalArticlepeer-review

Abstract

Soluble surfactants in suspended soap films are distributed on the surface monolayers and inside the films. We study theoretically the effects of the dynamics redistribution of surfactants between these two places on the Linearized soap film hydrodynamics. The interchange of surfactants can be incorporated into the existing hydrodynamic analysis as an effective complex surface modulus. The main effects are on Marangoni modes and the peristaltic modes. The presence of micelles at high surfactant concentration can be easily included for submegahertz frequencies provided the surfactant solution has a fast micelle forming/breaking kinetics. The effects of any intrinsic surface viscosities in the monolayers are briefly discussed.

Original languageEnglish
Pages (from-to)4225-4233
Number of pages9
JournalLangmuir
Volume11
Issue number11
DOIs
Publication statusPublished - Nov 1995

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