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Kinetics of sol-to-gel transition in irreversible particulate systems

Author:
Liu, Pai, Heinson, William R., Sorensen, Christopher M., Chakrabarty, Rajan K.
Source:
Journal of colloid and interface science 2019 v.550 pp. 57-63
ISSN:
0021-9797
Subject:
Monte Carlo method, equations, gelation, gels
Abstract:
A comprehensive theory encompassing the kinetics of the sol-to-gel transition is yet to be formulated due to break-down of the mean-field Smoluchowski Equation. Using high temporal-resolution Monte Carlo simulation of irreversible aggregation systems, we show that this transition has three distinct regimes with kinetic exponent z∈1,2 corresponding to aggregation of sol clusters proceeding to the ideal gel point (IGP); z∈2,5.7 for gelation of sol clusters beyond IGP; and z∈2,3.5 for a hitherto unidentified regime involving aggregation of gels when monomer-dense. We further establish universal power-law scaling relationships that connect the kinetics of these three regimes. Improved parameterizations are performed on the characteristic timescale parameters that define each regime.
Agid:
6378724