Honeycomb-like porous chitosan films prepared phase transition of poly(-isopropylacrylamide) during water evaporation under ambient conditions.

Honeycomb-like porous chitosan (CS) films are attractive tools for developing functional materials for filters, catalyses, adsorbents, biomaterials, A simple method for fabricating honeycomb-like porous CS films without special reagents, facilities, and techniques would make them accessible. Here we introduce an easily available method for fabricating honeycomb-like CS films without a strong acid/base, toxic reagents, or special facilities/techniques. An aqueous solution containing CS and poly(-isopropylacrylamide) (PNIPAm) was allowed to stand at 25 °C to evaporate water.