Doctoral Dissertations


Jiafu Fang


"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.


Venable, Raymond L., 1935-2008

Committee Member(s)

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



Degree Name

Ph. D. in Chemistry


University of Missouri--Rolla. Weldon Spring Endowment Fund


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.


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


xxi, 205 pages

Note about bibliography

Includes bibliographical references.


© 1987 Jiafu Fang, All rights reserved.

Document Type

Dissertation - Open Access

File Type




Subject Headings

Surface active agents
Polymer liquid crystals

Thesis Number

T 5512

Print OCLC #


Electronic OCLC #


Included in

Chemistry Commons