Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Colloidal Shear Thickening Fluids Using Variable Shaped Functional Star Particles: A Molecular Dynamics Study

Version 1 : Received: 8 September 2021 / Approved: 9 September 2021 / Online: 9 September 2021 (11:45:32 CEST)

How to cite: Salehin, R.; Xu, R.; Papanikolaou, S. Colloidal Shear Thickening Fluids Using Variable Shaped Functional Star Particles: A Molecular Dynamics Study. Preprints 2021, 2021090178 (doi: 10.20944/preprints202109.0178.v1). Salehin, R.; Xu, R.; Papanikolaou, S. Colloidal Shear Thickening Fluids Using Variable Shaped Functional Star Particles: A Molecular Dynamics Study. Preprints 2021, 2021090178 (doi: 10.20944/preprints202109.0178.v1).

Abstract

Complex colloidal fluids, depending on particulates’ shapes and packing fractions, may have a wide range of shear thinning and thickening behaviors. A particular interesting way to transition between different types of such behavior is by infusing functional complex particles that can be manufactured using modern techicques such as 3D printing. In this paper, we display 2D molecular dynamics simulations of such fluids with infused star-shaped functional particles, with variable leg length and number of legs, as they are infused in a non-interacting, coarse-grained fluid. We vary the packing fraction (ϕ) of the system, and for each different system we apply shear with various strain rate that turns the fluid into a jammed state and rise the apparent viscosity of fluid. We demonstrate the dependence of viscosity with the particles’ packing fraction. We show the role of shape and design dependence of the functional particles towards the transition to a shear thickening fluid .

Keywords

molecular dynamics; functional particles; jamming; shear thickening; viscosity; diffusivity

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