Polyvinyl alcohol aerogels with ordered and highly stable mesopores via unidirectional ice-template method
Polyvinyl alcohol(PVA)aerogels are widely used in various fields due to the lightweight and porous features.The pore structure plays a decisive role in the performances,but controllable fabrication of PVA aerogel with a tunable structure is still a challenge.Herein,a facile approach to prepare PVA aerogel with a designable pore structure by ice-induced self-assembly was reported.The relationship between the properties and structure was investigated by simply tuning factors such as temperature gradient,pre-freezing direction and solute concentration.The as-prepared aerogel had typical mesoporous(2-25nm)material characteristics and good flexibility.After hydrophobic modification,the PVA aerogels were changed from completely hydrophilic to surface hydrophobic,and the water contact angle and the absorption capacity of trichloromethane reached 117° and 20g/g,respectively.The research provided new insight into the controllable preparation and oil-water separation application of PVA-based aerogels.
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