Rates of solubilization of triolein into nonionic surfactant solutions

Bing Hung Chen, Clarence A. Miller, Peter R. Garrett

研究成果: Conference article同行評審

46 引文 斯高帕斯(Scopus)

摘要

Videomicroscopy was used to measure the rates of solubilization of triolein drops injected into thin, rectangular glass cells containing solutions of nonionic surfactants and their mixtures with alcohols at various temperatures. In most cases it was observed that after an induction period where drop radius was nearly constant, the rate (-dR/dt) of decrease in radius, which was proportional to the solubilization rate per unit area, was independent of time and of initial drop size. This behavior is not consistent with solubilization limited by diffusion in a stagnant surfactant solution with local equilibrium at the interface. Instead it suggests that processes occurring at the interface control the rate of solubilization. The rates of solubilization of triolein by the secondary alcohol ethoxylate Tergitol 15-S-7 at 30 °C and 35 °C, the latter temperature being just below the cloud point, were several times the corresponding rates for the pure linear alcohol ethoxylate C12E6 with enough n-dodecanol added to give it nearly the same cloud point. The difference in rates was much greater than could be explained by the relatively small differences in equilibrium solubilization of triolein and apparently stemmed from the smaller thickness and increased disorder in the hydrocarbon chain region of Tergitol 15-S-7 films which produced greater film flexibility. In contrast, the rates of solubilization of n-hexadecane by the two surfactant solutions were about the same and several times greater than the triolein solubilization rates. Addition of short-chain alcohols to the surfactant solutions increased the rates of solubilization of both triolein and n-hexadecane for both linear and secondary alcohol ethoxylates.

原文English
頁(從 - 到)129-143
頁數15
期刊Colloids and Surfaces A: Physicochemical and Engineering Aspects
128
發行號1-3
DOIs
出版狀態Published - 1997 八月 1
事件Proceedings of the 1996 11th International Symposium on Surfactants in Solution - Jerusalem, Isr
持續時間: 1996 六月 11996 六月 1

All Science Journal Classification (ASJC) codes

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

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