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Particle aggregation in alumina aerogels

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Abstract

Alumina aerogels were synthesized by low temperature CO2 supercritical drying (SCD) of gels via the Yoldas process. The aerogels have a surface area of ˜425 m2/gr, similar to that obtained under high pressure/temperature SCD. The surface area and the cluster size of the aerogels are strongly influenced by the amount of acid during gelation. Gels and aerogels were studied by small angle x-rays scattering (SAXS), and the data were analyzed using the Fisher–Burford equation. The SAXS results along with TEM observations support the existence of a hierarchical aggregation at the gelation stage, having a mass fractal dimension of Dm = 2.6−2.8. During the SCD the morphology collapses to form a structure with surface fractal dimension Ds = 2.6−2.9.

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Authors and Affiliations

  1. Chemical Engineering Department, 32000, Technion, Haifa, Israel

    S. Keysar, Y. De Hazan, Y. Cohen & G. S. Grader

  2. Materials Engineering Department, 32000, Technion, Haifa, Israel

    T. Aboud

Authors
  1. S. Keysar
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  2. Y. De Hazan
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  3. Y. Cohen
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  4. T. Aboud
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  5. G. S. Grader
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Keysar, S., De Hazan, Y., Cohen, Y. et al. Particle aggregation in alumina aerogels. Journal of Materials Research 12, 430–433 (1997). https://doi.org/10.1557/JMR.1997.0063

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  • DOI: https://doi.org/10.1557/JMR.1997.0063

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