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• W1972508867 endingPage "1157" @default.
• W1972508867 startingPage "1121" @default.
• W1972508867 abstract "We study via theory and dynamical simulation the evolving structure, particle dynamics, and time-dependent rheological properties of an aging colloidal gel, with a focus on the micro-mechanics that drive coarsening and age-related changes in linear-response behavior. When colloids in suspension attract one another, the attractions can lead to phase separation into particle-rich and particle-poor regions separated by a single interface. But this transition is sometimes interrupted before full separation occurs. With certain particle concentrations and interparticle potentials, the attractions that promote phase separation also inhibit it, frustrating the separation and “freezing in” a nonequilibrium particle configuration, resulting in a space-spanning gel. With attractions on the order of a few kT, gelation can produce nonfractal bicontinuous morphologies. In such “reversible” gels, thermal fluctuations are strong enough to rupture bonds and reform new ones, allowing restructuring of the gel over time. But, because particle diffusion is dramatically slowed by interparticle attractions, the march toward equilibrium is frustrated. Prior studies of colloidal gels have examined evolution of length scales and dynamics such as decorrelation times or heterogeneity. Left open were additional questions such as how the particle-rich regions are structured (liquidlike, glassy, and crystalline), how restructuring takes place (via bulk diffusion, surface migration, and coalescence of large structures), and the impact of the evolution on rheology. In this study, we conduct dynamic simulations to elucidate the post-gelation evolution of a system of 750 000 Brownian spheres interacting via a hard-sphere repulsion and short-range attractions of order kT, as would be generated by a polymer depletant, for example. We find that the network strands comprise a glassy, immobile interior near random-close packing, enclosed by a liquidlike surface along which the diffusive migration of particles drives coarsening. We show that coarsening is a three-step process of cage forming, cage hopping, and cage arrest, where particles migrate to ever-deeper energy wells via “Smoluchowski's ratchet.” Both elastic and viscous high-frequency moduli are found to scale with the square-root of the frequency, similar to the perfectly viscoelastic behavior of nonhydrodynamically interacting, purely repulsive dispersions. But here, the behavior is elastic over all frequencies, with a quantitative offset between elastic and viscous moduli which owes its origin to the hindrance of diffusion by particle attractions. Propagation of this elasticity via the network gives rise to age-stiffening as the gel coarsens. This simple phenomenological model suggests a rescaling of the moduli on network length scale which, when carried out, collapses each modulus for all gel ages onto a single universal curve. A theoretical model inspired by the Rouse model is advanced and, from it, we have obtained an analytical expression that captures the effects of (finite) structural aging on rheology: The moduli are linear in the network size, suggesting that linear mechanical response can be determined at any age by measurement of dominant network length scale—or vice versa." @default.
• W1972508867 created "2016-06-24" @default.
• W1972508867 creator A5052996738 @default.
• W1972508867 creator A5075841937 @default.
• W1972508867 creator A5089917537 @default.
• W1972508867 date "2014-09-01" @default.
• W1972508867 modified "2023-10-01" @default.
• W1972508867 title "A micro-mechanical study of coarsening and rheology of colloidal gels: Cage building, cage hopping, and Smoluchowski's ratchet" @default.
• W1972508867 cites W1606854735 @default.
• W1972508867 cites W1659688442 @default.
• W1972508867 cites W1965234283 @default.
• W1972508867 cites W1965536543 @default.
• W1972508867 cites W1965564512 @default.
• W1972508867 cites W1966732809 @default.
• W1972508867 cites W1967718603 @default.
• W1972508867 cites W1968437667 @default.
• W1972508867 cites W1969498402 @default.
• W1972508867 cites W1971944284 @default.
• W1972508867 cites W1972659566 @default.
• W1972508867 cites W1974178725 @default.
• W1972508867 cites W1974576789 @default.
• W1972508867 cites W1974669739 @default.
• W1972508867 cites W1975665006 @default.
• W1972508867 cites W1975863482 @default.
• W1972508867 cites W1979608886 @default.
• W1972508867 cites W1980705692 @default.
• W1972508867 cites W1980844867 @default.
• W1972508867 cites W1981926328 @default.
• W1972508867 cites W1982852815 @default.
• W1972508867 cites W1984205778 @default.
• W1972508867 cites W1984775475 @default.
• W1972508867 cites W1984817200 @default.
• W1972508867 cites W1985963282 @default.
• W1972508867 cites W1986946922 @default.
• W1972508867 cites W1987565940 @default.
• W1972508867 cites W1988312420 @default.
• W1972508867 cites W1990394864 @default.
• W1972508867 cites W1991473722 @default.
• W1972508867 cites W1995007717 @default.
• W1972508867 cites W1995983377 @default.
• W1972508867 cites W1999795425 @default.
• W1972508867 cites W2000674167 @default.
• W1972508867 cites W2000772229 @default.
• W1972508867 cites W2001893229 @default.
• W1972508867 cites W2002754781 @default.
• W1972508867 cites W2003450762 @default.
• W1972508867 cites W2004496960 @default.
• W1972508867 cites W2014407301 @default.
• W1972508867 cites W2015996045 @default.
• W1972508867 cites W2016469583 @default.
• W1972508867 cites W2017138309 @default.
• W1972508867 cites W2017445625 @default.
• W1972508867 cites W2018458881 @default.
• W1972508867 cites W2019465613 @default.
• W1972508867 cites W2022791005 @default.
• W1972508867 cites W2022908470 @default.
• W1972508867 cites W2022991507 @default.
• W1972508867 cites W2027578254 @default.
• W1972508867 cites W2028597802 @default.
• W1972508867 cites W2032701041 @default.
• W1972508867 cites W2032940149 @default.
• W1972508867 cites W2035312899 @default.
• W1972508867 cites W2036517717 @default.
• W1972508867 cites W2039018798 @default.
• W1972508867 cites W2040860530 @default.
• W1972508867 cites W2041551383 @default.
• W1972508867 cites W2046429008 @default.
• W1972508867 cites W2050945279 @default.
• W1972508867 cites W2051267614 @default.
• W1972508867 cites W2051451527 @default.
• W1972508867 cites W2053595375 @default.
• W1972508867 cites W2057131075 @default.
• W1972508867 cites W2059907475 @default.
• W1972508867 cites W2062934669 @default.
• W1972508867 cites W2063604908 @default.
• W1972508867 cites W2068264419 @default.
• W1972508867 cites W2068693163 @default.
• W1972508867 cites W2069988675 @default.
• W1972508867 cites W2070005887 @default.
• W1972508867 cites W2072645469 @default.
• W1972508867 cites W2073658284 @default.
• W1972508867 cites W2075792601 @default.
• W1972508867 cites W2077206715 @default.
• W1972508867 cites W2077798099 @default.
• W1972508867 cites W2080390601 @default.
• W1972508867 cites W2082443630 @default.
• W1972508867 cites W2083346601 @default.
• W1972508867 cites W2083851006 @default.
• W1972508867 cites W2084973030 @default.
• W1972508867 cites W2085038604 @default.
• W1972508867 cites W2085266415 @default.
• W1972508867 cites W2087404487 @default.
• W1972508867 cites W2088438936 @default.
• W1972508867 cites W2088795637 @default.
• W1972508867 cites W2090345293 @default.
• W1972508867 cites W2090508239 @default.
• W1972508867 cites W2091980176 @default.
• W1972508867 cites W2094858624 @default.

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