Publication
Title
Saponification of ethyl palmitate at the oil-water interface
Author
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.
Language
English
Source (journal)
Colloids and surfaces: A: physicochemical and engineering aspects. - Amsterdam
Publication
Amsterdam : 1994
ISSN
0927-7757
Volume/pages
83:1(1994), p. 63-73
ISI
A1994NB84000007
Full text (Publishers DOI)
Full text (publishers version - intranet only)
UAntwerpen
Faculty/Department
Research group
Publication type
Subject
Affiliation
Publications with a UAntwerp address
External links
Web of Science
Record
Identification
Creation 19.07.2012
Last edited 14.05.2017
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