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Pore Structure Simulation of Gels with a Binary Monomer Size Distribution

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Abstract

The pore size distribution in silica gels can be tailored by the addition of silica soot particles during the gel formation. We introduce a numerical model in order to simulate the structure of this “composite gel”. The algorithm is based on Diffusion-Limited Cluster-Cluster Aggregation model with an initial binary distribution of monomer sizes. The textural properties of the simulated gels are calculated using a simple triangulation method. Nitrogen adsorption-desorption experiments show that with the powder addition the mean pore size is shifted towards larger pore size and the specific surface area decreases. Numerical results of the mean pore size, specific surface area, and particles are in good agreement with experimental data. Because of these textural properties this new type of gels and aerogels has larger permeability and interesting properties as host matrix. The composite gels and the numerical model could also be helpful to simulate the natural allophanic gel found in volcanic soils.

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Authors and Affiliations

  1. Laboratoire des verres, UMR CNRS 5587, Université Montpellier II, Place E. Bataillon, 34095, Montpellier cedex, France

    J. Primera

  2. Departamento de fisica, FEC, LUZ., Maracaibo, Venezuela

    J. Primera

  3. Laboratoire des Colloídes, Verres et Nanocomposites UMR CNRS 5587, Université Montpellier II, Place E. Bataillon, 34095, Montpellier cedex, France

    T. Woignier

  4. IRD-UR Seqbio-Pole de Recherche Agronomique de la Martinique, 97232, Le Lamentin, France

    T. Woignier

  5. Laboratorio de Física Estadística de Sistemas Desordenados, Centro de Física, IVIC, Apdo. 21827, Caracas, 1020A, Venezuela

    A. Hasmy

Authors
  1. J. Primera
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  2. T. Woignier
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  3. A. Hasmy
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Correspondence to A. Hasmy.

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Primera, J., Woignier, T. & Hasmy, A. Pore Structure Simulation of Gels with a Binary Monomer Size Distribution. J Sol-Gel Sci Technol 34, 273–280 (2005). https://doi.org/10.1007/s10971-005-2524-5

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  • DOI: https://doi.org/10.1007/s10971-005-2524-5

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