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Titolo: DYNAMICS OF CONCENTRATED COLLOIDAL SUSPENSIONS PROBED BY XRAY CORRELATION SPECTROSCOPY
Autore: TSUI OKC; MOCHRIE SGJ;
 Indirizzi:
 MIT,DEPT PHYS,77 MASSACHUSETTS AVE CAMBRIDGE MA 02139
 Titolo Testata:
 Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics
fascicolo: 2,
volume: 57,
anno: 1998,
parte:, B
pagine: 2030  2034
 SICI:
 1063651X(1998)57:2<2030:DOCCSP>2.0.ZU;2W
 Fonte:
 ISI
 Lingua:
 ENG
 Soggetto:
 COUPLINGTHEORY ANALYSIS; LIGHTSCATTERING; GLASSTRANSITION; BROWNIANMOTION; SPHERES; DIFFUSION; DISPERSIONS; PARTICLES;
 Tipo documento:
 Article
 Natura:
 Periodico
 Settore Disciplinare:
 Science Citation Index Expanded
 Science Citation Index Expanded
 Citazioni:
 24
 Recensione:
 Indirizzi per estratti:



 Citazione:
 O.K.C. Tsui e S.G.J. Mochrie, "DYNAMICS OF CONCENTRATED COLLOIDAL SUSPENSIONS PROBED BY XRAY CORRELATION SPECTROSCOPY", Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics, 57(2), 1998, pp. 20302034
Abstract
We report xray intensity fluctuation spectroscopy (XIFS) measurements of the equilibrium dynamics of colloidal suspensions of chargestabilized Sb2O5 spheres of radius 250+/40 Angstrom in glycerol. The dynamics were investigated for times between 4 and several thousand seconds, and for wave vectors, Q, from 0.003 to 0.012 Angstrom(1), well beyond wave vectors that can be studied with visible light. The unique advantages of XIFS for studies of concentrated suspensions composed of refractiveindexmismatchcd components have not previously been explored. Here, we study a dilute sample (sample I) and a concentrated sample (sample Il). For sample I, the diffusion coefficient is independent ofQ, with a value consistent with the StokesEinstein relation. For sample II (effective hardsphere volume fraction, phi = 0.18), the diffusion coefficient exhibits a minimum at the peak of the structure factor, indicating modifications to Brownian behavior due to interparticle interactions. [S1063651X(98)108024].
ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/10/20 alle ore 01:47:17