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xufeigao

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Two main causes of gel cracking have been
identified: (1) Evaporation of solvents during the drying
step, which occurs specifically on the outer surface of the
capillary network, since the solid material at the drying
front is exposed to ambient atmosphere. Shrinking results
from stress caused by the existence of a meniscus at the
liquid¨Cvapour interface, which generates a differential
capillary pressure within the gel as the solvent tends to
evaporate [10]. (2) The syneresis which takes place as the
gel ages. This consists in the continuous rearrangement of
particles through further condensation reactions with the
associated loss of structural solvents (i.e., water and ethanol).
This process leads to a better packing of the gel body
and also to the undesirable process of fracturing.

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°®ÓëÓêÏÂ(½ð±Ò+2): 2012-01-17 08:42:20
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°®ÓëÓêÏÂ(½ð±Ò+1): 2012-01-17 20:00:32
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