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Microrheology of the liquid-solid transition during gelation.

Authors
  • Larsen, Travis H
  • Furst, Eric M
Type
Published Article
Journal
Physical review letters
Publication Date
Apr 11, 2008
Volume
100
Issue
14
Pages
146001–146001
Identifiers
PMID: 18518051
Source
Medline
License
Unknown

Abstract

The viscoelastic properties of physical and chemical polymer gels are characterized through the liquid-solid transition using particle tracking microrheology. Measurements of the probe particle mean-squared displacement are shifted as the extent of gelation increases to generate master curves. From the shift factors, we determine the gel point and critical scaling exponents. Both systems exhibit a critical relaxation exponent n approximately 0.6, where G' approximately G'' approximately omega n for the incipient gel, consistent with the Rouse model of dynamic scaling in the percolation universality class.

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