Article | REF: AF3609 V2

Aerogels. Fundamentals

Author: Thierry WOIGNIER

Publication date: July 10, 2017

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1. Reminders on gel formation

1.1 Definition of a gel and criteria for obtaining an aerogel

A gel is a thermodynamically stable solid-liquid two-phase system consisting of a continuous three-dimensional interpenetrating double network, one solid and one liquid. Flory has proposed a classification of gels that applies equally to organic and inorganic gels:

  • lamellar gels such as mesophase and clay gels;

  • polymer-type covalently bonded gels ;

  • gels formed by the physical aggregation (crystallization) of polymeric...

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Reminders on gel formation
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