Structure, dynamics, and rheology of concentrated dispersions of poly(ethylene glycol)-grafted colloids
- Zackrisson, Malin Department of Chemistry, Göteborg University, Sweden
- Stradner, Anna Department of Physics, University of Fribourg, Switzerland
- Schurtenberger, Peter Department of Physics, University of Fribourg, Switzerland
- Bergenholtz, Johan Department of Chemistry, Göteborg University, Sweden
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2006
Published in:
- Physical Review E. - 2006, vol. 73, no. 1, p. 011408
English
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.
- Faculty
- Faculté des sciences et de médecine
- Department
- Département de Physique
- Language
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- English
- Classification
- Physics
- License
- License undefined
- Identifiers
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- RERO DOC 5755
- DOI 10.1103/PhysRevE.73.011408
- Persistent URL
- https://folia.unifr.ch/unifr/documents/300216
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