Numerical Simulations of Sintering, Application to Partially Densified Aerogels |
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Authors: | N. Olivi-Tran R. Jullien |
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Affiliation: | (1) Laboratoire de Science des Matériaux Vitreux, Université Montpellier II, Place E. Bataillon, 34095 Montpellier, France |
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Abstract: | Following recent scaling theories, the sintering of silica aerogels in modeled starting from computer generated gel structures obtained by diffusion-limited cluster-cluster aggregation on a cubic lattice. Two steps compose the sintering process model: a dressing step in which all particles are replaced by overlapping larger particles and a contraction step in which an adequate length rescaling is performed in order to conserve the total mass. Several quantities are computed during sintering as a function of the aerogel density such as the two characteristic cut-off lengths (lower and upper limits of the fractal regime) and the specific interface area. Comparison is made with results of similar off-lattice calculations when available. Some of the numerical results are compared with experiments on partially densified base-catalysed aerogels. |
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Keywords: | sintering theory silica aerogels fractals |
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