Biomimetic Construction And Application Of Superwetting Photonic Crystals

Wettability is one of the important properties of solid surface,which has a broad prospect in military,construction,medical and People's Daily life applications.In recent years,the wetting regulation of solid surface structure and its behavior,especially superhydrophobic surface and superhydrophilic surface,has been extensively studied.Studies have shown that in addition to the influence of external forces such as photoelectricity,the wettability mainly depends on the chemical composition of the solid surface and its microstructure,especially the surface nanostructure is an important factor leading to superhydrophobicity.This paper based on photonic crystals,micro/nano structured hydrogel films with superhydrophobic properties and inverse opal structured hydrogel films with soot structure and photothermal conversion properties were prepared.The main research contents are as follows:(1)Use the improved sol seed method to synthesize monodisperse silica nanoparticles,control the reaction time and speed of tetraethyl orthosilicate and ammonia with the help of agitator and syringe pump,and finally synthesize monodisperse dioxide with different particle sizes silicon nanoparticles.Then,deionized water is used for multiple centrifugation to wash away the ammonia water,and a high-quality silica nanoparticle suspension with uniform particle size,full spherical shape and good dispersibility is obtained.(2)Using liquid-gas interface self-assembly technology,two-dimensional periodic photonic crystals with micron scale were prepared on the solid surface,and twodimensional periodic photonic crystals with nanoscale scale were continuously prepared on the solid surface,and the ordered hierarchical structure of micro/nano periodic photonic crystals with structural color was finally obtained.The micro/nano ordered hierarchical structures are then prepared on different solid surfaces(metal surfaces,glass surfaces,flexible material surfaces).The super-hydrophobic property of the hierarchical structure was explored by measuring the contact angle of the twodimensional structure at the micro/nano scale,and it was concluded that the contact angle of the hierarchical structure was greater than 150 °,and the micro/nano ordered hierarchical structure could be prepared on any material surface and had the superhydrophobic property.(3)The colloidal crystal self-assembly method is used to prepare a nano-scale silica photonic crystal structure with structural colors,and then the photosensitive hydrogels and thermosensitive hydrogels were combined to prepare anti-opal photonic crystal hydrogel films by UV polymerization or thermal polymerization.Then,candle soot was coated on the non-structured surface of the hydrogel film,and strong light was irradiated on both sides of the hydrogel film.By measuring the contact angles of both sides of the film and the temperature during strong light irradiation and statistical comparison.It is concluded that the film soot coating has a contact angle greater than150° on one side,and the structure color of the film has a blue shift phenomenon with the strong light irradiation to cause film discoloration.