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Titolo:
Structure and dynamics of concentrated dispersions of polystyrene latex spheres in glycerol: Static and dynamic x-ray scattering
Autore:
Lumma, D; Lurio, LB; Borthwick, MA; Falus, P; Mochrie, SGJ;
Indirizzi:
MIT, Dept Phys, Cambridge, MA 02139 USA MIT Cambridge MA USA 02139MIT, Dept Phys, Cambridge, MA 02139 USA MIT, Ctr Mat Sci & Engn, Cambridge, MA 02139 USA MIT Cambridge MA USA 02139 T, Ctr Mat Sci & Engn, Cambridge, MA 02139 USA
Titolo Testata:
PHYSICAL REVIEW E
fascicolo: 6, volume: 62, anno: 2000,
parte:, B
pagine: 8258 - 8269
SICI:
1063-651X(200012)62:6<8258:SADOCD>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
INTERACTING BROWNIAN PARTICLES; INTENSITY FLUCTUATION SPECTROSCOPY; PHOTON-CORRELATION SPECTROSCOPY; LONG-TIME DIFFUSION; LIGHT-SCATTERING; COLLOIDAL SUSPENSIONS; HARD-SPHERES; SYSTEMS; LIQUIDS; MONODISPERSE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
61
Recensione:
Indirizzi per estratti:
Indirizzo: Lumma, D MIT, Dept Phys, 77 Massachusetts Ave, Cambridge, MA 02139 USA MIT77 Massachusetts Ave Cambridge MA USA 02139 dge, MA 02139 USA
Citazione:
D. Lumma et al., "Structure and dynamics of concentrated dispersions of polystyrene latex spheres in glycerol: Static and dynamic x-ray scattering", PHYS REV E, 62(6), 2000, pp. 8258-8269

Abstract

X-ray photon correlation spectroscopy and small-angle x-ray scattering measurements are applied to characterize the dynamics and structure of concentrated suspensions of charge-stabilized polystyrene latex spheres dispersed in glycerol, for volume fractions between 2.7% and 52%. The static structures of the suspensions show essentially hard-sphere behavior. The short-timedynamics shows good agreement with predictions for the wave-vector-dependent collective diffusion coefficient, which are based on a hard-sphere modelCC. W. J. Beenakker and P. Mazur. Physica A 126, 349 (1984)]. However, theintermediate scattering function is found to violate a scaling behavior found previously for a sterically stabilized hard-sphere suspension [P. N. Segre and P. N. Pusey, Phys. Rev. Lett. 77, 771 (1996)]. Our measurements areparametrized in terms of a viscoelastic model for the intermediate scattering function [W. Hess and R. Klein, Adv. Phys. 32, 173 (1983)]. Within thisframework, two relaxation modes are predicted to contribute to the decay of the dynamic structure factor, with mode amplitudes depending on both wavevector and volume fraction. Our measurements indicate that, for particle volume fractions smaller than about 0.30, the intermediate scattering function is well described in terms of single-exponential decays, whereas a double-mode structure becomes apparent for more concentrated systems.

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Documento generato il 21/09/20 alle ore 16:10:56