Determining the critical micelle concentration in O/W emulsion using the rate constant of hydrolysis for benzyl acetate

Hassan Almoazen, Anthony P. Simonelli

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

An attempt to evaluate the kinetically effective critical micelle concentration CMC of sodium dodecyl sulfate (SDS) in micellar solutions and in O/W emulsions at 40°C and pH 9 utilizing the pseudo first order rate constant of benzyl acetate hydrolysis was implemented. The critical micelle concentration of SDS in micellar solutions was determined by both surface tension measurements utilizing Wilhelmy plate technique and by rate constant of hydrolysis. Hydrolysis reaction of benzyl acetate was monitored in surfactant solutions as well as in o/w emulsions as a function of time. Emulsion droplets were controlled using microfluidizer 110 T and oily droplets were separated from the emulsion by ultracentrifugation at (11,500 rpm or 9,800 g) prior to analysis by high performance liquid chromatography. The value of the critical micelle concentration (CMC) in micellar solutions in the presence of benzyl acetate as determined from the Wilhelmy plate technique was 7.8 × 10-4 moles/L (CMC in micellar solution was 10 times lower than the value in literature due to use of buffer) while the CMC as determined from the kinetic study was 8.8 × 10-4 moles/L. In emulsion systems, using 5% mineral oil, the CMC value was 8.6 × 10-3 moles/L and at 10% oil, the value doubled to 1.73 × 10-2 moles/L. The above results indicate that kinetics can be used to determine CMC in micellar solutions and in o/w emulsions.

Original languageEnglish (US)
Pages (from-to)958-965
Number of pages8
JournalJournal of Dispersion Science and Technology
Volume29
Issue number7
DOIs
StatePublished - Aug 1 2008

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Critical micelle concentration
Emulsions
emulsions
hydrolysis
acetates
Hydrolysis
Rate constants
micelles
Sodium dodecyl sulfate
sodium sulfates
Sodium Dodecyl Sulfate
mineral oils
Mineral Oil
Kinetics
benzyl acetate
Mineral oils
liquid chromatography
kinetics
High performance liquid chromatography
Surface-Active Agents

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Polymers and Plastics

Cite this

Determining the critical micelle concentration in O/W emulsion using the rate constant of hydrolysis for benzyl acetate. / Almoazen, Hassan; Simonelli, Anthony P.

In: Journal of Dispersion Science and Technology, Vol. 29, No. 7, 01.08.2008, p. 958-965.

Research output: Contribution to journalArticle

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