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- W4301857306 abstract "We consider gelation of colloidal particles in suspension after cessation of shear flow. Particle aggregation is driven by a temperature-tunable attractive potential which controls the growth of clusters under isothermal conditions. A series of frequency resolved time sweeps is used to systematically reconstruct the frequency dependent dynamic moduli as a function of time and temperature or attraction strength. The data display typical hallmarks of gelation with an abrupt transition from a fluid state into a dynamically arrested gel state after a characteristic gelation time $t_g$ that varies exponentially with temperature and serves to collapse the evolution of the system onto a universal curve. We observe the viscoelastic properties of the critical gel where we find that $G'(omega)approxeq G''(omega)sim omega^{n_c}$ where $n_c=0.5$ in a narrow time window across all attraction strengths. We measure a dynamic critical exponent of $kappa=0.25$ which is similar to that observed in crosslinked polymer gels. The approach to the critical gel is therefore governed by $eta_0sim-epsilon^{-s}$ and $G_esimepsilon^z$ with $s=z=2$ where $epsilon=p/p_c-1$ is the distance to the gel point. Remarkably, the relaxation moduli of the near-critical gels are identical across the temperatures considered, with $G(t)approx0.33t^{-0.5}$. This suggests an underlying strong similarity in gel structure in the regime of attraction strengths considered, despite the differences in aggregation kinetics. We contrast these findings with the behavior of a colloidal glass undergoing dynamical arrest where no critical state is observed and where the arrest time of the system displays a marked frequency dependence. These findings highlight the underlying structural differences between colloidal gels and glasses which are manifest in their dynamic properties in the vicinity of the liquid-to-solid transition." @default.
- W4301857306 created "2022-10-05" @default.
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- W4301857306 date "2014-01-30" @default.
- W4301857306 modified "2023-09-30" @default.
- W4301857306 title "Viscoelasticity of a colloidal gel during dynamical arrest: evolution through the critical gel and comparison with a soft colloidal glass" @default.
- W4301857306 doi "https://doi.org/10.48550/arxiv.1401.8018" @default.
- W4301857306 hasPublicationYear "2014" @default.
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