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Titolo:
Effect of surfactant interfacial orientation/aggregation on adsorption dynamics
Autore:
Fainerman, VB; Miller, R; Aksenenko, EV; Makievski, AV; Kragel, J; Loglio, G; Liggieri, L;
Indirizzi:
Max Planck Inst Kolloid & Grenzflachenforsch, D-14467 Golm, Germany Max Planck Inst Kolloid & Grenzflachenforsch Golm Germany D-14467 ermany Donetsk Med Univ, Int Med Physicochem Ctr, UA-340003 Donetsk, Ukraine Donetsk Med Univ Donetsk Ukraine UA-340003 r, UA-340003 Donetsk, Ukraine Inst Colloid Chem & Chem Water, UA-252680 Kiev, Ukraine Inst Colloid Chem & Chem Water Kiev Ukraine UA-252680 2680 Kiev, Ukraine Univ Florence, Inst Organ Chem, Florence, Italy Univ Florence Florence Italy Florence, Inst Organ Chem, Florence, Italy CNR, Inst Fis Applicata Mat, I-16149 Genoa, Italy CNR Genoa Italy I-16149 NR, Inst Fis Applicata Mat, I-16149 Genoa, Italy
Titolo Testata:
ADVANCES IN COLLOID AND INTERFACE SCIENCE
fascicolo: 1-2, volume: 86, anno: 2000,
pagine: 83 - 101
SICI:
0001-8686(20000524)86:1-2<83:EOSIOO>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
FLUID-FLUID INTERFACES; SOLUTION-AIR INTERFACE; IONIC SURFACTANTS; ALKYLPHOSPHINE OXIDES; NONIONIC SURFACTANTS; WATER/AIR INTERFACE; OCTYLPHENYL ETHERS; KINETICS; LAYER; TENSION;
Keywords:
surfactant adsorption layers; interfacial orientation; interfacial aggregation; thermodynamic models; diffusional transport;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
46
Recensione:
Indirizzi per estratti:
Indirizzo: Miller, R Max Planck Inst Kolloid & Grenzflachenforsch, Muehlenberg 2, D-14467 Golm,Germany Max Planck Inst Kolloid & Grenzflachenforsch Muehlenberg 2 Golm Germany D-14467
Citazione:
V.B. Fainerman et al., "Effect of surfactant interfacial orientation/aggregation on adsorption dynamics", ADV COLL IN, 86(1-2), 2000, pp. 83-101

Abstract

The application of new thermodynamic adsorption isotherms allow to improvethe description of surfactant adsorption kinetics based on a diffusional transport. While the consideration of interfacial reorientation corrects apparently too high diffusion coefficients, interfacial aggregation avoids toosmall diffusion coefficients or the assumption of adsorption barriers. Theadsorption kinetics of alkyl dimethyl phosphine oxides is influenced by interfacial reorientation. While the lower homologues (C-8-C-12) follow the classical diffusion model, the higher homologues (C-13-C-15) yield diffusioncoefficients several times larger than the physically reasonable values. Assuming two different adsorption states, the resulting diffusion coefficients agree with those expected from the geometric size of the molecules. The model also works well for oxyethylated non-ionics, such as C10EO8. As a second example, a good theoretical description is obtained for experiments of 1-decanol solutions when a mean surface aggregation number of n = 2.5 is assumed. The same n was obtained from the description of the equilibrium adsorption isotherm of 1-decanol. Assuming that the transition from one into the other state is controlled by a rate constant (change in orientation, formation or disintegration of two-dimensional aggregates) significant changes in the kinetics curves can result. The use of additional rate constants yields an improved fitting to experimental data. (C) 2000 Elsevier Science B.V. All rights reserved.

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Documento generato il 15/07/20 alle ore 06:47:04