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Adsorption of N,N-Diethyldodecanamide at the Air–Water Interface

✍ Scribed by John Texter

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
49 KB
Volume
217
Category
Article
ISSN
0021-9797

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✦ Synopsis

The adsorption of N,N-diethyldodecanamide (DEDA) at the air-water interface has been determined at 24°C by surface tension measurements. At monolayer saturation each molecule has a surface area, depending on the equation of state assumed, of about 41.2-45.6 Å 2 , comparable to that observed for sodium dodecyl sulfate and other somewhat similar surfactants. Micellization of DEDA appears not to occur below its aqueous saturation concentration of 1.4 ؋ 10 ؊5 M. At saturation the surface tension is lowered to 37 dyn cm ؊1 , and the standard free energy of adsorption is about ؊46.5 kJ mol ؊1 . The surface adsorption deviates slightly from the Szyszkowski-Langmuir surface equation of state at coverages below 50%, and a two-state adsorption mechanism proposed by Lunkenheimer and Hirte appears to best account for this deviation.

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