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Self-assembly and rheology of dipolar colloids in simple shear studied using multi-particle collision dynamics

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Abstract

Magnetic nanoparticles in a colloidal solution self-assemble in various aligned structures, which has a profound influence on the flow behavior. However, the precise role of the microstructure in the development of the rheological response has not been reliably quantified. We investigate the self-assembly of dipolar colloids in simple shear using hybrid molecular dynamics and multi-particle collision dynamics simulations with explicit coarse-grained hydrodynamics, conduct simulated rheometric studies and apply micromechanical models to produce master curves, showing evidence of the universality of the structural behavior governed by the competition between the bonding (dipolar) and erosive (thermal and/or hydrodynamic) stresses. The simulations display viscosity changes across several orders of magnitude in fair quantitative agreement with various literature sources, substantiating the universality of the approach, which seems to apply generally across vastly different length scales and a broad range of physical systems.

Graphical abstract: Self-assembly and rheology of dipolar colloids in simple shear studied using multi-particle collision dynamics

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Publication details

The article was received on 03 May 2017, accepted on 15 Aug 2017 and first published on 16 Aug 2017


Article type: Paper
DOI: 10.1039/C7SM00878C
Citation: Soft Matter, 2017, Advance Article
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    Self-assembly and rheology of dipolar colloids in simple shear studied using multi-particle collision dynamics

    D. Zablotsky, E. Blums and H. J. Herrmann, Soft Matter, 2017, Advance Article , DOI: 10.1039/C7SM00878C

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