Doctoral Dissertations

Jiafu Fang

Abstract

"Phase diagrams have been determined showing the extent of the inverse micellar or microemulsion region for several ionic surfactants and some cosurfactants. Hexylamine has been found to be a very effective cosurfactant giving rise to very good water solubilizing capacity at extremely low surfactant concentrations and very low cosurfactant levels at rather high initial hydrocarbon levels.

A fairly extensive study of phase equilibria of the system composed of sodium dodecyl sulfate, hexylamine, heptane, and water has been carried out. The conductivity behavior of the inverse micellar or microemulsion phase of the system shows the percolation phenomenon. Low angle X-ray diffraction has been used to investigate the lamellar liquid crystalline phase. Equations are developed or modified to allow determination of the degree of interpenetration between the amphiphile bilayers and aqueous layers in the lamellar liquid crystal structure.

The association structures of water-in-oil (W/O) microemulsions containing sodium dodecyl sulfate, hexylamine, heptane, and aqueous sodium chloride have been investigated using time-average and dynamic light scattering techniques. Molecular weights, diffusion coefficients, and particle size of microemulsion droplets were determined. Modern theories of fluids have been used to interpret the behavior of scattered light intensity and diffusion coefficients"--Abstract, page iii.

Advisor(s)

Venable, Raymond L., 1935-2008

Committee Member(s)

Friberg, Stig, 1930-
Hanna, Samir B.
Manuel, O. (Oliver), 1936-
Neogi, P. (Partho), 1951-

Department(s)

Chemistry

Degree Name

Ph. D. in Chemistry

Sponsor(s)

University of Missouri--Rolla. Weldon Spring Endowment Fund

Comments

Electronic access to the full-text of this document is restricted to Missouri S&T users. Print thesis not available at Missouri S&T Library; scan made from microfilm is best quality available.

Publisher

University of Missouri--Rolla

Publication Date

Spring 1987

Journal article titles appearing in thesis/dissertation

  • Microemulsions with high water solubilizing capacity at high hydrocarbon levels and very low surfactant concentrations
  • Conductivity study of the microemulsion system sodium dodecyl suflate-hexylamine-heptane-water
  • Lamellar liquid crystals and other phases in the system sodium dodecyl sulfate, hexylamine, water, and heptane
  • Light scattering study of microemulsions composed of sodium dodecyl sulfate, hexylamine, heptane, and aqueous sodium chloride solution

Pagination

xxi, 205 pages

Note about bibliography

Includes bibliographical references.

Rights

© 1987 Jiafu Fang, All rights reserved.

Document Type

Dissertation - Open Access

File Type

text

Language

English

Subject Headings

Surface active agentsEmulsionsPolymer liquid crystalsMicelles

Thesis Number

T 5512

Print OCLC #

18092562

Electronic OCLC #

930783632

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