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Hydrodynamics strongly affect the dynamics of colloidal gelation but not gel structure

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Abstract

Colloidal particles with strong, short-ranged attractions can form a gel. We simulate this process without and with hydrodynamic interactions (HI), using the lattice-Boltzmann method to account for presence of a thermalized solvent. We show that HI speed up and slow down gelation at low and high volume fractions, respectively. The transition between these two regimes is linked to the existence of a percolating cluster shortly after quenching the system. However, when we compare gels at matched ‘structural age’, we find nearly indistinguishable structures with and without HI. Our result explains longstanding, unresolved conflicts in the literature.

Graphical abstract: Hydrodynamics strongly affect the dynamics of colloidal gelation but not gel structure

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Publication details

The article was received on 06 Aug 2018, accepted on 23 Nov 2018 and first published on 27 Nov 2018


Article type: Communication
DOI: 10.1039/C8SM01611A
Citation: Soft Matter, 2019, Advance Article
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    Hydrodynamics strongly affect the dynamics of colloidal gelation but not gel structure

    J. de Graaf, W. C. K. Poon, M. J. Haughey and M. Hermes, Soft Matter, 2019, Advance Article , DOI: 10.1039/C8SM01611A

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