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

Författare och institution:
Malin Zackrisson (Institutionen för kemi); Anna Stradner (-); Peter Schurtenberger (-); Johan Bergenholtz (Institutionen för kemi)
Publicerad i:
Physical review. E, Statistical, nonlinear, and soft matter physics, 73 ( 1 Pt 1 ) s. 011408
Artikel, refereegranskad vetenskaplig
Sammanfattning (abstract):
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.
Ämne (baseras på Högskoleverkets indelning av forskningsämnen):
Kemi ->
Fysikalisk kemi ->
Yt- och kolloidkemi
Postens nummer:
Posten skapad:
2007-10-15 13:38
Posten ändrad:
2012-01-26 11:56

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