Microrheology of the liquid-solid transition during gelation - PubMed (original) (raw)
Microrheology of the liquid-solid transition during gelation
Travis H Larsen et al. Phys Rev Lett. 2008.
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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