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Adsorption Behavior of Oxyethylated Surfactants at the Air/Water Interface

✍ Scribed by R. Miller; V.B. Fainerman; H. Möhwald

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
119 KB
Volume
247
Category
Article
ISSN
0021-9797

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✦ Synopsis

Literature data for homologous series of nonionic and ionic surfactants, such as C(n)OH, C(n)EO(m), Tritons, C(n)SO4Na, and C(n)EO(m)SO4Na, were analyzed on the basis of the Frumkin and reorientation models. The thermodynamic quantities obtained from the reorientation model agree best with the experimental data. They yield the standard free energy of adsorption which can be split into contributions from the alkyl chain, and the polar head group. An additional contribution to the increment of the polar group deltaG0(P) from m EO groups deltaG0(EO(m)) is extracted which can be accounted for by deltaG0(EO(m)) = -2.35 square root(m) kJ/mol. The standard free energy of adsorption is well understood by the increment method used.

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