When can liquid be removed from a gel without disrupting the network formed by the gels solid component?

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<a href="http://qanda.encyclopedia.com/question/can-liquid-removed-gel-without-disrupting-network-formed-gels-solid-component-144902.html" >When can liquid be removed from a gel without disrupting the network formed by the gels solid component?</a>

Aerogels are produced from certain gels (see colloid ) by heating the gel under pressure, which causes the liquid in the gel to become supercritical (in a state between a liquid and a gas) and lose its surface tension. In this state, the liquid may be removed from the gel by applying additional heat, without disrupting the porous network formed by the gel's solid component.