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- W4381586961 abstract "Colloidal gels are elasto-plastic materials composed of an out-of-equilibrium, self-assembled network of micron-sized (solid) particles suspended in a fluid. Recent work has shown that far-field hydrodynamic interactions do not change gel structure, only the rate at which the network forms and ages. However, during gel formation, the interplay between short-ranged attractions leading to gelation and equally short-ranged hydrodynamic lubrication interactions remains poorly understood. Here, we therefore study gelation using a range of hydrodynamic descriptions: from single-body (Brownian Dynamics), to pairwise (Rotne-Prager-Yamakawa), to (non-)lubrication-corrected many-body (Stokesian Dynamics). We confirm the current understanding informed by simulations accurate in the far-field. Yet, we find that accounting for lubrication can strongly impact structure at low colloid volume fraction. Counterintuitively, strongly dissipative lubrication interactions also accelerate the aging of a gel, irrespective of colloid volume fraction. Both elements can be explained by lubrication forces facilitating collective dynamics and therefore phase-separation. Our findings indicate that despite the computational cost, lubricated hydrodynamic modeling with many-body far-field interactions is needed to accurately capture the evolution of the gel structure." @default.
- W4381586961 created "2023-06-22" @default.
- W4381586961 creator A5032111689 @default.
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- W4381586961 date "2023-06-20" @default.
- W4381586961 modified "2023-09-26" @default.
- W4381586961 title "Hydrodynamic Lubrication in Colloidal Gels" @default.
- W4381586961 doi "https://doi.org/10.48550/arxiv.2306.11716" @default.
- W4381586961 hasPublicationYear "2023" @default.
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