Adsorption kinetics of partially ionized fatty acids at oil/water interface of their monomeric and liposomal solution

Muhamad, R. and Misran, Misni (2017) Adsorption kinetics of partially ionized fatty acids at oil/water interface of their monomeric and liposomal solution. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 528. pp. 23-29. ISSN 0927-7757

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Official URL: http://dx.doi.org/10.1016/j.colsurfa.2017.04.040

Abstract

Fatty acid in the partially ionized form has an astounding ability to adsorb at oil/water interface. The mechanism for adsorption of fatty acids in this condition is expected to be diffusion controlled without the presence of the adsorption barrier. Based on the existing adsorption theory, we studied the kinetics of adsorption of fatty acid at pKa environment. It was observed that both the diffusion and the kinetic (barrier) models satisfactorily described the adsorption kinetics of fatty acid monomeric solution. This behavior thus leads to a contradiction in the interpretation of results. It was observed that the contradictions could occur in the controlling mechanism, the location of the barrier, and the origination of the existence of the barrier. Herein reports the contradiction observed in the kinetics of surfactant adsorption that is often overlooked. The higher affinity of fatty acids molecule for adsorption leads to the breakdown of liposome in solution. The liposome dissociation rate constant, k, obtained from the diffusion model is increased with the increase in the liposome concentration.

Item Type: Article
Uncontrolled Keywords: Fatty acid; Adsorption kinetics; Dynamic interfacial tension; Diffusion-controlled; Barrier-controlled; Adsorption model
Subjects: Q Science > QD Chemistry
Divisions: Faculty of Science > Dept of Chemistry
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 04 Aug 2017 01:13
Last Modified: 11 Feb 2019 09:01
URI: http://eprints.um.edu.my/id/eprint/17612

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