Adsorption behavior of oxyethylated surfactants at the air/water interface.
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.
Miller
R
R
Max-Planck-Institut für Kolloid-und Grenzflächenforschung, Potsdam/Golm, 14424, Germany.
Fainerman
V B
VB
Möhwald
H
H
D000327:Adsorption; D011092:Polyethylene Glycols / Q000737:chemistry*; D013499:Surface Properties; D013500:Surface Tension; D013501:Surface-Active Agents / Q000737:chemistry*; D013816:Thermodynamics
D013501:Surface-Active Agents; D011092:Polyethylene Glycols