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Titolo:
Multicomponent diffusion in systems containing molecules of different size- Part 3. Mutual diffusion in the ternary system hexa(ethylene glycol)-di(ethylene glycol)-water
Autore:
Vergara, A; Paduano, L; Sartorio, R;
Indirizzi:
Univ Naples Federico II, Dipartimento Chim, I-80126 Naples, Italy Univ Naples Federico II Naples Italy I-80126 Chim, I-80126 Naples, Italy
Titolo Testata:
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
fascicolo: 19, volume: 3, anno: 2001,
pagine: 4340 - 4345
SICI:
1463-9076(2001)3:19<4340:MDISCM>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
HIGH SALT CONCENTRATION; PROTEIN CRYSTALLIZATION; POLYETHYLENE-GLYCOL; INCLUSION-COMPOUNDS; LYSOZYME CHLORIDE; AQUEOUS-SOLUTION; CRYSTAL-GROWTH; LAYER GROWTH; COEFFICIENTS; 25-DEGREES-C;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
52
Recensione:
Indirizzi per estratti:
Indirizzo: Sartorio, R Univ Naples Federico II, Dipartimento Chim, Complesso Univ Monte S Angelo Via Cinthia, I-80126 Naples, Italy Univ Naples Federico II Complesso Univ Monte S Angelo Via Cinthia Naples Italy I-80126
Citazione:
A. Vergara et al., "Multicomponent diffusion in systems containing molecules of different size- Part 3. Mutual diffusion in the ternary system hexa(ethylene glycol)-di(ethylene glycol)-water", PHYS CHEM P, 3(19), 2001, pp. 4340-4345

Abstract

The diffusion of a model system describing a polydisperse sample has been investigated experimentally. Precise mutual diffusion coefficients were measured, with a Gouy interferometer, for the ternary system hexa(ethylene glycol)(6)Edi(ethylene glycol)(2)-water at four values of the concentration ratio beta (6) = C-6/(C-6 + C-2), and at a constant total concentration C-6 C-2 = 0.3000 mol dm(-3). The main-term diffusion coefficient, D-22, shows a substantial decrease with beta (6), while D-66 varies modestly. Both cross-term diffusion coefficients are positive, the largest, D-26, reaches a value that is about 15% of the corresponding main-term. The experimental diffusion coefficients of this system have been interpreted through an extension of the common hard sphere hydrodynamic theory. Good agreement between theexperimental diffusion coefficients and those predicted by a set of equations recently proposed by the authors for systems of non-ionic and slightly interacting solutes has been found. These equations, accounting only for the "excluded volume" effect, succeed in the evaluation of the value of the diffusion coefficients in ternary systems with solute size mismatch. A comparative analysis, with analogous systems investigated previously confirms the efficiency of our predictive procedure.

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Documento generato il 30/09/20 alle ore 09:28:51