Removing water from a gel

Can anyone answer why it might be difficult to remove water from a gel
that has been swollen by water. :?:
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The Enemy Within
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Because the surface tension will collapse the gel into a booger. The usual method is to heat the gel above the triple point of water, where the meniscus disappears, and then dry it out.
Phil Hobbs
Reply to
Phil Hobbs
Diffusivity of water (or any other solvent molecule) depends on the local concentration of the water in the polymer. The higher the water level, the greater the diffusivity, or in your case, the lower the water concentration, the lower the diffusivity. So, the more water you remove, the more difficult it will be to remove the remaining water.
John "Only wimps specialize in the general case. Real scientists pursue examples." Beresford Parlett
Reply to
John Spevacek

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