Chiral nematic latex–GO composite films with synchronous response of color and actuation

摘要: We report the preparation of flexible latex/graphene oxide (GO) composite films templated by cellulose nanocrystals (CNCs), which show dual responses with interesting color and morphological changes toward water. First, ternary chiral nematic order were prepared via evaporation-induced self-assembly (EISA) an aqueous dispersion containing latex, GO CNCs. Driven difference in gravity increase entropy, uneven distribution occurs majority gathering at top film. In second step, CNCs selectively etched alkali treatment, leading to formation latex/GO (LG) retain asymmetric GO. Meanwhile, flexibility film has been greatly improved. The asymmetrically-organized LG different wettability on bottom surfaces, induces varying extent swelling As a result, synchronous response actuation was realized. Compared other two-dimensional actuators, presented this work have advantage easy additional change. addition, are also more robust than those bilayer structure, tend delaminate during repeated utilization.