What affects the rate of evaporation in a material?

[Cibek]

Hello!

I've been researching hygroscopic materials and evaporation rate a bit lately, and a question has struck me which I haven't found an answer to yet: What material factors affect the rate of evaporation? Is it possible to engineer a material which is hygroscopic (absorbs water) in humid air, but dries really quickly once the air humidity is lowered?

 

[mfb]

In general, a large surface area speeds up both directions. No idea about specific materials.