Chitosan for constructing stable polymer-inorganic suspensions and multifunctional membranes for wound healing

Restricted by the rigid chain structure, chitosan-based materials are very fragile and easy to break up. Herein, a stable and positively charged chitosan/Ti 3 C 2 T x suspension was successfully constructed by adjusting mixing sequence, pH and ratio of chitosan to Ti 3 C 2 T x to prepare a multifunctional membrane (P-CM) with self-standing ability, good flexibility, biocompatibility, excellent photothermal antibacterial properties , and sensitive humidity sensing properties. In the first stage, protonated chitosan acted as sugar coatings was able to be encapsulated on the surface of Ti 3 C 2 T x nanosheets by electrostatic self-assembly, in turn achieving charge reversal of the nanoparticles . In the second stage, chitosan acted as molecular needles to suture the membrane formed by chitosan/Ti 3 C 2 T x particles via vacuum filtration (VAF) with the commercial flexible poly(vinylidene fluoride) (PVDF) membrane. The as-prepared P-CM membrane simultaneously solves the problem of insufficient flexibility of a single component chitosan membrane and the poor bonding between pure Ti 3 C 2 T x membranes and substrate membrane.