Colloid and Polymer Science

, Volume 270, Issue 8, pp 759–767 | Cite as

Steric repulsion of polyoxyethylene groups for emulsion stability

  • K. Tajima
  • M. Koshinuma
  • A. Nakamura
Original Contributions

Abstract

Rapid coalescence was studied on liquid paraffin emulsion stabilized with a series of poly(oxyethylene) dodecyl ethers [C12H25 (EO),n=1, 2, 3, 4, 5, 6, 7, 8] and of poly(oxyethylene) nonylphenyl ethers [C9H19Ф(EO) n ,n=2, 4, 5, 6, 12]. The turbidity of emulsion was measured as a function of the solution pHs at constant ionic strength of 0.1 mol dm−3.

As a result, it was found that the emulsions (which were formed with C12H25(EO) n surfactants having less than four oxyethylene groups, or with C9H19 Ф(EO) n surfactants having less than six oxyethylene groups) brought about rapid coalescence in the bulk pH between 2.0∼3.5, which corresponded to the zero point of charges for the emulsions of the present systems. According to the Tadros treatment for emulsion flocculation, the total flocculation potennual was estimated as a function of the distance relative to the number of oxyethelene groups in the surfactants. The critical coalescence energy was obtained as −343 ×10−19 J for the C12H25(EO) n surfactants and −2.14×10−19) J for the C9H19 Ф(EO) n surfactants. Furthermore, the formation of a hole for coalescence was estimated under the simple assumption that the coalescence was caused only by the energy dissipation.

Key words

Emulsionstability nonionicsurfactants ζpotential stericstabilization rapidcoalescence 

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Copyright information

© Steinkopff-Verlag 1992

Authors and Affiliations

  • K. Tajima
    • 1
  • M. Koshinuma
    • 2
  • A. Nakamura
    • 3
  1. 1.Department of Chemistry, Faculty of EngineeringKanagawa UniversityYokohama-shiJapan
  2. 2.Laboratory of ChemistryTeikyo University of TechnologyIchihara-shi, ChibaJapan
  3. 3.Nagoya Municipal Women's CollegeNagoya-shi, AichiJapan

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