title: Shear-induced reaction-limited aggregation kinetics of brownian particles at arbitrary concentrations.
abstract: The aggregation of interacting brownian particles in sheared concentrated suspensions is an important issue in colloid and soft matter science per se. Also, it serves as a model to understand biochemical reactions occurring in vivo where both crowding and shear play an important role. We present an effective medium approach within the Smoluchowski equation with shear which allows one to calculate the encounter kinetics through a potential barrier under shear at arbitrary colloid concentrations. Experiments on a model colloidal system in simple shear flow support the validity of the model in the concentration range considered. By generalizing Kramers' rate theory to the presence of shear and collective hydrodynamics, our model explains the significant increase in the shear-induced reaction-limited aggregation kinetics upon increasing the colloid concentration.
authors.affiliation: Department of Chemistry and Applied Biosciences, ETH Zurich, 8093 Zurich, Switzerland. alessio.zaccone@chem.ethz.ch
authors.forename: Alessio
authors.initials: A
authors.lastname: Zaccone
authors.forename: Daniele
authors.initials: D
authors.lastname: Gentili
authors.forename: Hua
authors.initials: H
authors.lastname: Wu
authors.forename: Massimo
authors.initials: M
authors.lastname: Morbidelli