Structure, dynamics, and rheology of concentrated dispersions of poly(ethylene glycol)-grafted colloids

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Malin Zackrisson,¹ Anna Stradner,² Peter Schurtenberger,² and Johan Bergenholtz¹
¹Department of Chemistry, Göteborg University, SE-412 96, Göteborg, Sweden
²Department of Physics, University of Fribourg, CH-1700, Fribourg, Switzerland

Received 12 August 2005; published 24 January 2006

Acomprehensive experimental study of the dynamics and rheology of concentratedaqueous dispersions of poly(ethylene glycol)-grafted colloidal spheres is reported. Thestudy focuses on good solvent conditions, for which excluded-volume interactionsdominate. At high concentrations a glass transition is evident fromthe nondecaying component of the intensity correlation function measured withthree-dimensional dynamic light scattering. Results for the linear viscoelastic andsteady shear rheology on approaching the glass transition correlate wellwith the slowing of the diffusive dynamics; in particular, at,or close to, the concentration where the dynamics becomes nonergodic,the dispersions acquire a low-frequency plateau in the elastic shearmodulus as well as a yield stress. The overall behaviorof the dispersions conforms to that of hard-sphere dispersions; however,some qualitative differences are observed in the evolution of thedynamics and rheology with increasing concentration near the glass transition.

URL:	http://link.aps.org/doi/10.1103/PhysRevE.73.011408
DOI:	10.1103/PhysRevE.73.011408
PACS:	82.70.Dd; 83.60.Bc; 83.60.Fg; 64.70.Pf 82.70.Dd Colloids 83.60.Bc Linear viscoelasticity 83.60.Fg Shear rate dependent viscosity 64.70.Pf Glass transitions YEAR: 2006
KEYWORDS:	colloids, polymer blends, polymer structure, rheology, viscoelasticity, glass transition, shear modulus, yield stress

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