Characterization of a water-in-oil microemulsion containing a concentrated ammonium ferric sulfate aqueous phase

J. G. Darab, D. M. Pfund, J. L. Fulton, John Linehan, M. Capel, Y. Ma

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

A water-in-oil (w/o) microemulsion containing high concentrations of ammonium ferric sulfate in solution was characterized by SAXS, EXAFS, electrical conductivity, and viscosity measurements and by its phase behavior. The nanometer-sized aqueous droplets are microemulsified by sodium bis(2-ethylhexyl) sulfosuccinate (AOT) in an isooctane continuous phase. Addition of small amounts of sodium dodecyl sulfate (SDS) as a cosurfactant greatly aids in the solubilization of the inorganic electrolyte-laden aqueous phase. For this five-component system there is a large region of the composition phase space that exists as a clear, stable w/o microemulsion. A portion of this w/o microemulsion phase space can be characterized as spherically shaped aqueous nanometer-sized droplets. A simple relationship between the total surfactant concentration and the amount of water on the droplet size was established. This relationship has the same form as the well-known relationship for the ternary system, AOT/water/isooctane. True thermodynamic equilibrium was not established in this microemulsion study because the reaction times for the various ferric oxyhydroxide species are prohibitively long. As a result, pseudoequilibria for this ammonium ferric sulfate microemulsion are reported. Because of the high concentration of inorganic electrolyte that can be dissolved in the microemulsion phase, these systems are useful for the synthesis of large quantities of nanophase particles.

Original languageEnglish
Pages (from-to)135-141
Number of pages7
JournalLangmuir
Volume10
Issue number1
Publication statusPublished - Jan 1994

Fingerprint

Microemulsions
sulfates
Oils
oils
Water
water
Electrolytes
electrolytes
Dioctyl Sulfosuccinic Acid
thermodynamic equilibrium
ternary systems
sodium sulfates
reaction time
Viscosity measurement
Sodium dodecyl sulfate
Ternary systems
Phase behavior
Phase composition
Surface-Active Agents
Sodium Dodecyl Sulfate

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry

Cite this

Darab, J. G., Pfund, D. M., Fulton, J. L., Linehan, J., Capel, M., & Ma, Y. (1994). Characterization of a water-in-oil microemulsion containing a concentrated ammonium ferric sulfate aqueous phase. Langmuir, 10(1), 135-141.

Characterization of a water-in-oil microemulsion containing a concentrated ammonium ferric sulfate aqueous phase. / Darab, J. G.; Pfund, D. M.; Fulton, J. L.; Linehan, John; Capel, M.; Ma, Y.

In: Langmuir, Vol. 10, No. 1, 01.1994, p. 135-141.

Research output: Contribution to journalArticle

Darab, JG, Pfund, DM, Fulton, JL, Linehan, J, Capel, M & Ma, Y 1994, 'Characterization of a water-in-oil microemulsion containing a concentrated ammonium ferric sulfate aqueous phase', Langmuir, vol. 10, no. 1, pp. 135-141.
Darab, J. G. ; Pfund, D. M. ; Fulton, J. L. ; Linehan, John ; Capel, M. ; Ma, Y. / Characterization of a water-in-oil microemulsion containing a concentrated ammonium ferric sulfate aqueous phase. In: Langmuir. 1994 ; Vol. 10, No. 1. pp. 135-141.
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