From bio-inspired functional film to reactive nano-patterned honeycomb as a clickable platform
Résumé
Porous materials are attractive for a large variety of applications with their high surface and can be designed by the "breath figure" BF method, for obtaining honeycomb HC-structured porous films.1,2 In addn., we have demonstrated that copolymers self-assembly CSA can provide a second level of structure on the nano-scale in the wall between pores,3 leading to hierarchically structured bio-inspired materials.4-10 To go further, a HC film displaying three scales of hierarchy was produced for the first time with two micro- and nano-porosities levels formed by the BF process, giving a bio-inspired diatom exoskeleton, with a third structuration induced by the CSA between the pores (Figure 1). The presence of reactive nano-domains at the film surface allowed successive chem. modifications by click chem., which induces a Cassie-Baxter to Wenzel transition, 10 leading to a hierarchically structured reactive platform by simple click chem. 11.