Physicochemical Studies of Solutes in Microemulsions.
Abstract
We have investigated the utility of oil in water microemulsions as media for the study of processes occurring at microscopic oil/water interfaces. Various microemulsion systems using emulsifiers of the surfactant/alcohol type have been formulated. Cationic, anionic, and nonionic surfactants have been employed, and phase maps for seven of these systems have been obtained. Selected systems have been further characterized by conductance, dye, and light scattering measurements. Electrochemical studies consisting of specific ion electrode, polarographic and conductivity measurements have been performed, and quantitative expressions for the transport properties of ions in the nonionic microemulsions have been developed. Acid-base equilibria employing indicators have shown the usefulness of average pH values as determined by glass electrode data. The reactions of phosphate ester with hydroxide and fluoride in cationic and mixed cationic/nonionic microemulsions show that the intrinsic rate constant is higher than in aqueous cationic micelles. The use of small added amounts of functionalized surfactant yields a rate increase of almost two orders of magnitude in cationic microemulsion.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 29, 1979
- Accession Number
- ADA073534
Entities
People
- Raymond A. Mackay
Organizations
- Drexel University