Aggregation Behavior of Mixed-Counterion Double-Chained Surfactants

Abstract

The aggregation behavior of dilute solutions of the ditetradecyldimethylammonium surfactant cation with mixtures of bromide and acetate counterions was studied using video enhanced microscopy, cryo- transmission electron microscopy, and time resolved fluorescence quenching. Large liposomal aggregates of the bromide surfactant are gradually transformed into micellar aggregates by the addition of the acetate surfactant. Stable, equilibrium, unilamellar vesicles predominate at intermediate concentrations (40-60% Br-), while small, spherical micelles coexist with, and gradually replace, vesicles as the bromide content is further reduced. Similar behavior is seen with long chain-short chain phospholipid mixtures. These results are analyzed in terms of free energy minimization and bilayer asymmetry arguments.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1991
Accession Number
ADA257206

Entities

People

  • D. D. Miller
  • D. F. Evans

Organizations

  • University of Minnesota

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Abstracts
  • Asymmetry
  • Chemical Engineering
  • Curvature
  • Dispersions
  • Electron Microscopy
  • Energy
  • Fluorescence
  • Free Energy
  • High Resolution
  • Images
  • Materials
  • Materials Science
  • Microscopy
  • Molecules
  • Synthetic Membranes
  • Transmission Electron Microscopy

Readers

  • Materials Science and Engineering.
  • Molecular and Cellular Biochemistry
  • Polymer Science and Technology

Technology Areas

  • Microelectronics