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Drying of Large Monolithic Aerogels between Atmospheric and Supercritical Pressures

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Abstract

The objectives of this investigation are to show the feasibility of producing large monoliths with minimal shrinkage at subcritical conditions, and to understand the drying behavior. Crack-free SiO2 monoliths (5.6 cm in diameter and 25 cm in length) were repeatedly dried with little shrinkage (<2%). Some gels showed increasing shrinkage with decreasing pressure. However, this shrinkage was reduced to negligible levels at conditions considerably less than supercritical pressure by increasing both the pore size and the gel strength. This moderate pressure drying (MPD) process may make aerogel fabrication economically more feasible due to reduced pressure chamber costs.

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Authors and Affiliations

  1. YTC America Inc., 550 Via Alondra, Camarillo, CA, 93012, USA

    Fikret Kirkbir, Hideaki Murata, Douglas Meyers & S. Ray Chaudhuri

Authors
  1. Fikret Kirkbir
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  2. Hideaki Murata
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  3. Douglas Meyers
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  4. S. Ray Chaudhuri
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Kirkbir, F., Murata, H., Meyers, D. et al. Drying of Large Monolithic Aerogels between Atmospheric and Supercritical Pressures. Journal of Sol-Gel Science and Technology 13, 311–316 (1998). https://doi.org/10.1023/A:1008668009340

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  • DOI: https://doi.org/10.1023/A:1008668009340

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