Microstructures and mechanics in the colloidal film drying process

Soft Matter
Mu Wang, John F Brady

Abstract

We use Brownian Dynamics (BD) simulations and continuum models to study the microstructures and mechanics in the colloidal film drying process. Colloidal suspensions are compressed between a planar moving interface and a stationary substrate. In the BD simulations, we develop a new Energy Minimization Potential-Free (EMPF) algorithm to enforce the hard-sphere potential in confined systems and to accurately measure the stress profile. The interface moves either at a constant velocity Uw or via a constant imposed normal stress Σe. Comparing the interface motions to the particle Brownian motion defines the Péclet numbers PeU = Uwa/d0 and PeΣ = Σea3/kBT, respectively, where d0 = kBT/ζ with kBT the thermal energy scale, ζ the single-particle resistance, and a the particle radius. With a constant interface velocity, thermodynamics drives the suspension behavior when PeU ≪ 1, and homogeneous crystallization appears when the gap spacing between the two boundaries pushes the volume fraction above the equilibrium phase boundary. In contrast, when PeU ≫ 1, local epitaxial crystal growth appears adjacent to the moving interface even for large gap sizes. Interestingly, the most amorphous film microstructures are found at moderate PeU. The f...Continue Reading

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Citations

Sep 10, 2018·The Journal of Chemical Physics·Michael P HowardAthanassios Z Panagiotopoulos
Aug 11, 2020·The Journal of Chemical Physics·Michael P Howard, Arash Nikoubashman
Oct 8, 2019·Nanoscale·Tommy Waltmannn, Alex Travesset
May 3, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Oriol CusolaOrlando J Rojas

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