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5 - Drying of Wet Gels

Published online by Cambridge University Press:  03 December 2021

Lorenz Ratke
Affiliation:
German Aerospace Center
Pavel Gurikov
Affiliation:
Hamburg University of Technology
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Summary

Aerogel technology provides lightweight materials with an outstanding combination of properties. One major problem for the preparation of aerogels is how to eliminate the liquid solvent from the wet gel while avoiding shrinkage, cracking and collapse of the gel structure. Several techniques have been used and are still under development. The chapter discusses three techniques to dry a wet gel: ambient or evaporative drying, freeze drying and supercritical drying. All aspects of each drying technique are explained in detail, andvarious effects of drying routines on the final aerogel structure and thus properties are discussed.

Type
Chapter
Information
The Chemistry and Physics of Aerogels
Synthesis, Processing, and Properties
, pp. 140 - 202
Publisher: Cambridge University Press
Print publication year: 2021

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