Dynamics of cellulose whiskers spatially trapped in agarose hydrogels
BORSALI, Redouane
Laboratoire de Chimie des polymères organiques [LCPO]
Team 1 LCPO : Polymerization Catalyses & Engineering
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Laboratoire de Chimie des polymères organiques [LCPO]
Team 1 LCPO : Polymerization Catalyses & Engineering
BORSALI, Redouane
Laboratoire de Chimie des polymères organiques [LCPO]
Team 1 LCPO : Polymerization Catalyses & Engineering
< Réduire
Laboratoire de Chimie des polymères organiques [LCPO]
Team 1 LCPO : Polymerization Catalyses & Engineering
Langue
en
Article de revue
Ce document a été publié dans
International Journal of Biological Macromolecules. 2006, vol. 39, n° 10, p. 3622-3627
Elsevier
Résumé en anglais
The motion of cellulose whiskers trapped in agarose hydrogels is measured by depolarized dynamic light scattering (DDLS) under conditions of optical heterodyning, in which the rigid polymer network provides a static ...Lire la suite >
The motion of cellulose whiskers trapped in agarose hydrogels is measured by depolarized dynamic light scattering (DDLS) under conditions of optical heterodyning, in which the rigid polymer network provides a static depolarized reference signal. At low concentration in free suspension, the rotational relaxation rate Theta of the whiskers is decoupled from the osmotic properties of the suspension. When incorporated inside a gel, however, as the agarose concentration increases, Theta first increases beyond that in the free suspension, reflecting a reduced amplitude of rotational fluctuations of the whiskers due to the repulsive interactions with their surroundings. At the same time, the dynamic light scattering Rayleigh ratio R-VH obtained from DDLS decreases with increasing gel concentration. At high gel concentrations, however, Theta tends to decrease due to the steric hindrance of the network. Except at the lowest whisker concentrations, Theta is governed by the same fluctuations as those associated with R-VH.< Réduire
Mots clés en anglais
PARTICLES
RIGID MATRIX
POLYMER-SOLUTIONS
VISCOUS FORCE
SYMMETRIC TOP MACROMOLECULES
LIGHT-SCATTERING
ROTATIONAL DIFFUSION
FRICTION COEFFICIENTS
CIRCULAR-CYLINDERS
GELS
Origine
Importé de halUnités de recherche