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

Zackrisson, Malin,1974Gothenburg University,Göteborgs universitet,Institutionen för kemi,Department of Chemistry (author)

A comprehensive experimental study of the dynamics and rheology of concentrated aqueous dispersions of poly(ethylene glycol)-grafted colloidal spheres is reported. The study focuses on good solvent conditions, for which excluded-volume interactions dominate. At high concentrations a glass transition is evident from the nondecaying component of the intensity correlation function measured with three-dimensional dynamic light scattering. Results for the linear viscoelastic and steady shear rheology on approaching the glass transition correlate well with 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 shear modulus as well as a yield stress. The overall behavior of the dispersions conforms to that of hard-sphere dispersions; however, some qualitative differences are observed in the evolution of the dynamics and rheology with increasing concentration near the glass transition.

Stradner, Anna (author)
Schurtenberger, Peter (author)
Bergenholtz, Johan,1964Gothenburg University,Göteborgs universitet,Institutionen för kemi,Department of Chemistry(Swepub:gu)xbjohq (author)
Göteborgs universitetInstitutionen för kemi (creator_code:org_t)

In:Physical review. E, Statistical, nonlinear, and soft matter physics73:1 Pt 11539-3755

By the author/editor: Zackrisson, Mali ...; Stradner, Anna; Schurtenberger, ...; Bergenholtz, Joh ...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Chemical Science ...; and Physical Chemist ...

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