Diffusing probe measurements of polystyrene latex particles in polyelectrolyte solutions: Deviations from Stokes-Einstein behavior

Dunstan, D. E. and Stokes, J. R. (2000) Diffusing probe measurements of polystyrene latex particles in polyelectrolyte solutions: Deviations from Stokes-Einstein behavior. Macromolecules, 33 1: 193-198. doi:10.1021/ma9908503


Author Dunstan, D. E.
Stokes, J. R.
Title Diffusing probe measurements of polystyrene latex particles in polyelectrolyte solutions: Deviations from Stokes-Einstein behavior
Journal name Macromolecules   Check publisher's open access policy
ISSN 0024-9297
Publication date 2000-01-01
Year available 2000
Sub-type Article (original research)
DOI 10.1021/ma9908503
Open Access Status Not yet assessed
Volume 33
Issue 1
Start page 193
End page 198
Total pages 6
Place of publication Washington, D.C.
Publisher American Chemical Society
Language eng
Subject 09 Engineering
Abstract The diffusion coefficients of polystyrene latex spheres in both Newtonian and elastic liquids have been measured using dynamic light scattering. The diffusion coefficients of the latex particles measured in glycerol/water (Newtonian) solutions obey Stokes−Einstein behavior over a range of solvent viscosity and temperature. Two apparent diffusion coefficients for the particles are measured in viscoelastic polyacrylamide solutions and are designated Dfast and Dslow. The apparent fast diffusion coefficients measured in the polyacrylamide solutions show an increase to a maximum, above that measured in the solvent water, with increasing polyacrylamide concentration. The apparent fast diffusion coefficient is seen to increase to twice that measured in the water solvent. At higher polyacrylamide concentrations the observed Dfast values decrease below the value obtained in the solvent water. Dfast increases with the scattering vector (q) while Dslow is independent of q.
Keyword Polymer Science
Polymer Science
POLYMER SCIENCE
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Chemical Engineering Publications
 
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Created: Thu, 02 Jul 2009, 02:04:21 EST