Study on surfactant adsorption kinetics: effects of interfacial curvature and molecular interaction

Ching Tien Hsu, Chien-Hsiang Chang, Shi Yow Lin

研究成果: Article同行評審

17 引文 斯高帕斯(Scopus)

摘要

A concept on the surfactant adsorption kinetics was explored and illustrated with 1-octanol and C12E8 (Langmuir, 1997, 13, 6204): using only a limited range of equilibrium surface tension data to determine the adsorption isotherm can cause a serious mistake in the determination of adsorption kinetics and in the evaluation of diffusion coefficient from the dynamic surface tension data. A systematic theoretical study was also reported recently for surfactants adsorbing onto a clean planar air-water interface (Langmuir, 1999, 15, 1952). To learn the effect of curvature of the fluid interface on this issue, a theoretical study is performed for surfactants adsorbing onto a clean spherical air-water interface with different curvature. Data from this simulation indicate that (a) for any interfacial curvature, the stronger the surfactant interactions (i.e., with a larger absolute K value), the greater the deviation in apparent diffusivity (D) or in sorption rate constants (ka, kd) obtained from a Langmuir analysis; (b) at the same K, the larger the interfacial curvature, the smaller the deviation in D or in ka and kd; and (c) a larger deviation in diffusivity results at more dilute concentrations.

原文English
頁(從 - 到)1211-1215
頁數5
期刊Langmuir
16
發行號3
DOIs
出版狀態Published - 2000 二月 8

All Science Journal Classification (ASJC) codes

  • 材料科學(全部)
  • 凝聚態物理學
  • 表面和介面
  • 光譜
  • 電化學

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