Influence of molecular structure of hydrocarbon emulsion droplets on their solubilization in nonionic surfactant micelles

Jochen Weiss, John Neil Coupland, Dason Brathwaite, D. Julian McClements

Research output: Contribution to journalArticlepeer-review

69 Scopus citations

Abstract

Light scattering was used to study the mass transport of hydrocarbon molecules from emulsion droplets to nonionic surfactant micelles. The hydrocarbons used as the dispersed phase of the emulsions were: 1-tetradecene, n-tetradecane, 1-hexadecene, n-hexadecane, 1-octadecene and n-octadecane. Oil-in-water emulsions were prepared which had the same initial droplet diameter (0.3 μm), but different droplet concentrations (0 to 0.05 wt.%). The emulsion droplets were then suspended in either pure water or an aqueous micellar nonionic surfactant solution (2 wt.% polyoxyethylene sorbitan monolaurate) and the time-dependence of the droplet concentration and size distribution monitored at 30 °C using static light scattering. In the absence of surfactant micelles the size and concentration of the hydrocarbon droplets remained constant, but in their presence the droplet concentration decreased with time, and the mean droplet diameter increased, indicating that solubilization occurred. The growth in droplet size with time is attributed to enhanced Ostwald ripening in the presence of surfactant micelles. The mass-transport rate of oil molecules from droplets to micelles, the growth in droplet size with time and the maximum amount of oil solubilized per unit amount of surfactant, increased in the following order: n-octadecane<1-octadecene<n-hexadecane<1-hexadecene< n-tetradecane<1-tetradecene.

Original languageEnglish (US)
Pages (from-to)53-60
Number of pages8
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume121
Issue number1
DOIs
StatePublished - Mar 10 1997

All Science Journal Classification (ASJC) codes

  • Surfaces and Interfaces
  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

Fingerprint Dive into the research topics of 'Influence of molecular structure of hydrocarbon emulsion droplets on their solubilization in nonionic surfactant micelles'. Together they form a unique fingerprint.

Cite this