# Reaction-limited Colloidal Aggregation Induced by Salt and Inert Polymers

Source: [Reaction-limited Colloidal Aggregation Induced by Salt and Inert Polymers](<https://www.sota2.com/research/paper/68fa20f07a2b558e2933440e>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-28T13:52:10.847Z

Authors: M. Hosek, J.X. Tang

Published: 2007-08-21T21:20:37.000Z

## Abstract

Salt-induced aggregation of 20 nm colloidal silica is followed by light transmission, which shows an a kinetic form exp\[-(t/t\_0)^{\\alpha}\], where \\alpha = 2.6 and t\_0 is an empirical time constant which reflects the colloidal stability. We found a power law dependence of t\_0 on ionic strength, which can be explained by the classical DLVO theory. The neutral polymers polyethylene glycol (PEG) accelerate the aggregation rate, and those with higher molecular weight are more effective in inducing the aggregation with similar stretched exponential form of kinetics. Current theories of polymer-mediated interactions provide a reasonable interpretation of the effect of PEG. The stretched exponential kinetics of the light transmission is found to be consistent with a cluster-size dynamic scaling model of aggregation.

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/0708.2919>)

[PDF](<https://arxiv.org/pdf/0708.2919.pdf>)