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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, I80126 Naples, Italy Univ Naples Federico II Naples Italy I80126 Chim, I80126 Naples, Italy
 Titolo Testata:
 PHYSICAL CHEMISTRY CHEMICAL PHYSICS
fascicolo: 19,
volume: 3,
anno: 2001,
pagine: 4340  4345
 SICI:
 14639076(2001)3:19<4340:MDISCM>2.0.ZU;2U
 Fonte:
 ISI
 Lingua:
 ENG
 Soggetto:
 HIGH SALT CONCENTRATION; PROTEIN CRYSTALLIZATION; POLYETHYLENEGLYCOL; INCLUSIONCOMPOUNDS; LYSOZYME CHLORIDE; AQUEOUSSOLUTION; CRYSTALGROWTH; LAYER GROWTH; COEFFICIENTS; 25DEGREESC;
 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, I80126 Naples, Italy Univ Naples Federico II Complesso Univ Monte S Angelo Via Cinthia Naples Italy I80126



 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. 43404345
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) = C6/(C6 + C2), and at a constant total concentration C6 C2 = 0.3000 mol dm(3). The mainterm diffusion coefficient, D22, shows a substantial decrease with beta (6), while D66 varies modestly. Both crossterm diffusion coefficients are positive, the largest, D26, reaches a value that is about 15% of the corresponding mainterm. 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 nonionic 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.
ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/09/20 alle ore 09:28:51