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Simulation study of nonergodicity transitions: gelation in colloidal systems with short-range attractions | | Antonio M Puertas
; Matthias Fuchs
; Michael E Cates
; | | Date: |
28 Feb 2003 | | Journal: | Phys Rev E, 67 (3 Pt 1), 031406 | | Abstract: | Computer simulations were used to study the gel transition occurring in colloidal systems with short-range attractions. A colloid-polymer mixture was modeled and the results were compared with mode coupling theory (MCT) expectations and with the results for other systems (hard-spheres system and Lennard-Jones system). The self-intermediate scattering function and the mean squared displacement were used as the main dynamical quantities. Two different colloid packing fractions have been studied. For the lower packing fraction, alpha-scaling holds and the wave-vector analysis of the correlation function shows that gelation is a regular nonergodicity transition within MCT. The leading mechanism for the novel nonergodicity transition is identified as the bond formation caused by the short-range attraction. The time scale and diffusion coefficient also show qualitatively the expected behavior, although different exponents are found for the power-law divergences of these two quantities. The non-Gaussian parameter was also studied and a very large correction to Gaussian behavior was found. The system with higher colloid packing fraction shows indications of a nearby high-order singularity, causing alpha scaling to fail, but the general expectations for nonergodicity transitions still hold. | | Source: | PubMed, pmid12689066 | | Services: | Forum | Review | Favorites | |
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