Monolayers of mixed surfactants at the oil-water interface, hydrophobic interactions, and stability of water-in-oil emulsions

L. Ghaicha, Roger Leblanc, F. Villamagna, A. K. Chattopadhyay

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

The present study involves investigation of monolayer properties of sorbitan monooleate and diethanolamine derivatives of polyisobutylene succinic anhydride of three different molecular weights, viz. 500, 700, and 1050, as single as well as binary mixtures at the oil-water interface. The average backbone carbon numbers of the polyisobutylene chains are 14, 22, and 34, respectively. The monolayer studies at the oil-water interface were carried out with a specially designed Langmuir trough. The investigations were carried out at two different oil phases, viz. heptane and paraffin oil. The packing efficiency of these surfactants (single or in combination) are found to be greatly influenced by the oil chain length. Within the limits of experimental accuracy, the mixed surfactant systems comprising sorbitan monooleate and polyisobutylene surfactants of three different hydrocarbon chain lengths follow the rule of hydrocarbon chain length compatibility. The observed differences in packing features revealed the significance of oil penetration and cohesive interactions in the aliphatic layer of the surfactant film. The efficacy of these surfactants were further examined in water-in-oil emulsions and the results are consistent with the findings of monolayer properties. At the condition of chain length compatibility, the mixed surfactant system produced emulsions with maximum stability.

Original languageEnglish
Pages (from-to)585-590
Number of pages6
JournalLangmuir
Volume11
Issue number2
StatePublished - Feb 1 1995
Externally publishedYes

Fingerprint

Emulsions
Surface-Active Agents
emulsions
Monolayers
Oils
Surface active agents
oils
surfactants
Chain length
polyisobutylene
Water
water
diethanolamine
interactions
Hydrocarbons
compatibility
Paraffin oils
hydrocarbons
Heptanes
Heptane

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

Cite this

Monolayers of mixed surfactants at the oil-water interface, hydrophobic interactions, and stability of water-in-oil emulsions. / Ghaicha, L.; Leblanc, Roger; Villamagna, F.; Chattopadhyay, A. K.

In: Langmuir, Vol. 11, No. 2, 01.02.1995, p. 585-590.

Research output: Contribution to journalArticle

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