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

Zackrisson Oskolkova, Malin LU ; Stradner, Anna LU ; Schurtenberger, Peter LU and Bergenholtz, Johan (2006) In Physical Review E 73(1). p.1-011408
Abstract
A comprehensive experimental study of the dynamics and rheology of concentrated aqueous dispersions of

polyethylene 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... (More)
A comprehensive experimental study of the dynamics and rheology of concentrated aqueous dispersions of

polyethylene 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. (Less)
Please use this url to cite or link to this publication:
author
publishing date
type
Contribution to journal
publication status
published
subject
keywords
colloids, hard sphere interactions, rheology, nonergodic, glass transition
in
Physical Review E
volume
73
issue
1
pages
1 - 011408
publisher
American Physical Society
external identifiers
  • Scopus:32844467989
ISSN
1063-651X
DOI
10.1103/PhysRevE.73.011408
language
English
LU publication?
no
id
36c6a206-f9c4-4cc4-b15e-2ecd407e9c0e (old id 3363748)
date added to LUP
2013-01-18 13:05:43
date last changed
2016-12-04 04:42:44
@misc{36c6a206-f9c4-4cc4-b15e-2ecd407e9c0e,
  abstract     = {A comprehensive experimental study of the dynamics and rheology of concentrated aqueous dispersions of<br/><br>
polyethylene glycol-grafted colloidal spheres is reported. The study focuses on good solvent conditions, for<br/><br>
which excluded-volume interactions dominate. At high concentrations a glass transition is evident from the<br/><br>
nondecaying component of the intensity correlation function measured with three-dimensional dynamic light<br/><br>
scattering. Results for the linear viscoelastic and steady shear rheology on approaching the glass transition<br/><br>
correlate well with the slowing of the diffusive dynamics; in particular, at, or close to, the concentration where<br/><br>
the dynamics becomes nonergodic, the dispersions acquire a low-frequency plateau in the elastic shear modulus<br/><br>
as well as a yield stress. The overall behavior of the dispersions conforms to that of hard-sphere dispersions;<br/><br>
however, some qualitative differences are observed in the evolution of the dynamics and rheology with<br/><br>
increasing concentration near the glass transition.},
  author       = {Zackrisson Oskolkova, Malin and Stradner, Anna and Schurtenberger, Peter and Bergenholtz, Johan},
  issn         = {1063-651X},
  keyword      = {colloids,hard sphere interactions,rheology,nonergodic,glass transition},
  language     = {eng},
  number       = {1},
  pages        = {1--011408},
  publisher    = {ARRAY(0x95280b0)},
  series       = {Physical Review E},
  title        = {Structure, dynamics, and rheology of concentrated dispersions of poly(ethylene glycol)-grafted colloids},
  url          = {http://dx.doi.org/10.1103/PhysRevE.73.011408},
  volume       = {73},
  year         = {2006},
}