Title
Saponification of ethyl palmitate at the oil-water interfaceSaponification of ethyl palmitate at the oil-water interface
Author
Faculty/Department
Faculty of Sciences. Chemistry
Research group
Department of Chemistry
Publication type
article
Publication
Amsterdam,
Subject
Chemistry
Source (journal)
Colloids and surfaces: A: physicochemical and engineering aspects. - Amsterdam
Volume/pages
83(1994):1, p. 63-73
ISSN
0927-7757
ISI
A1994NB84000007
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
The study of chemical reactions at an interface using a theory of the dynamics of interfaces is of great interest. Here we studied the saponification taking place at a hexane-water interface when ethyl palmitate transfers from hexane to aqueous alkali solution. During saponification at the interface, the interfacial tension decreases as a function of time; after a certain time, the interfacial tension passes through a minimum, then reaches a steady state. The minimum is due to the difference in the adsorptions of reactants, intermediates and products. The steady state values are described by a new surface equation of state which is established by modifying the Langmuir equation for a surfactant system with an adjustable parameter (1 + 2x2s/x1s where x2s and x1s are the mole fractions of surfactants 1 and 2 in the surface). The dynamic and steady state values are treated theoretically and compared with experimental values. Rather good agreement between theory and experiment is achieved.
E-info
https://repository.uantwerpen.be/docman/iruaauth/a9b4f0/1444389.pdf
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