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Title
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Saponification of ethyl palmitate at the oil-water interface
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Author
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Abstract
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| 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. |
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Language
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English
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Source (journal)
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Colloids and surfaces: A: physicochemical and engineering aspects. - Amsterdam
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Publication
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Amsterdam
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1994
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ISSN
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0927-7757
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DOI
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10.1016/0927-7757(93)02640-Z
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Volume/pages
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83
:1
(1994)
, p. 63-73
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ISI
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A1994NB84000007
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Full text (Publisher's DOI)
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Full text (publisher's version - intranet only)
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