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

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.

arXiv comment7 pages, 4 figures

References in corpus (8)

• Extended corresponding-states behavior for particles with variable range attractions
• Simulation of a Single Polymer Chain in Solution by Combining Lattice Boltzmann and Molecular Dynamics
• Hydrodynamic and contact contributions to shear thickening in colloidal suspensions
• Lattice Boltzmann simulations of soft matter systems
• Glasslike Arrest in Spinodal Decomposition as a Route to Colloidal Gelation
• Phase diagram of the adhesive hard sphere fluid
• Probing colloidal gels at multiple lengthscales: the role of hydrodynamics
• Tree-ansatz percolation of hard spheres

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