Barnacle inspired strategy combined with solvent exchange for enhancing wet adhesion of hydrogels to promote seawater-immersed wound healing

Hydrogels are promising materials for wound protection,but in wet,or underwater environments,the hydration layer and swelling of hydrogels can seriously reduce adhesion and limit their application.In this study,inspired by the structural characteristics of strong barnacle wet adhesion and combined with solvent exchange,a robust wet adhesive hydrogel(CP-Gel)based on chitosan and 2-phenoxyethyl acrylate was obtained by breaking the hydration layer and resisting swelling.As a result,CP-Gel exhibited strong wet adhesion to various interfaces even underwater,adapted to joint movement and skin twisting,resisted sustained rushing water,and sealed damaged organs.More importantly,on-demand detachment and controllable adhesion were achieved by promoting swelling.In addition,CP-Gel with good biosafety significantly promotes seawater-immersed wound healing and is promising for use in water-contact wound care,organ sealing,and marine emergency rescue.

High quality crystal growth and characterization of ferroelectric Ba_(0.77)Ca_(0.23)TiO_(3) single crystal

Ba_(0.77)Ca_(0.23)TiO_(3)(BCT)single crystal has been widely studied as a promising lead-free ferroelectric material.In this work,high-quality BCT crystal was successfully grown by the Czochralski(CZ)method.The as-grown crystal is crack-free and shows black coloration.It possesses a high dielectric stability over a wide temperature range,while the dielectric loss is rather small below 90℃.Furthermore,it possesses excellent ferroelectric properties with residual polarization strength(Pr)and coercive field(Ec)of 17.93μC/cm^(2) and 8.47 kV/cm,respectively.Besides,BCT crystal shows large electromechanical coupling factors,with kt,k31,k33 and k15 of 0.535,0.254,0.714 and 0.721,respectively.The piezoelectric coefficients d31,d33 and d15 are measured to be−36.5,130 and 246 pC/N,respectively.