Hang Li,Yi Wu,Hongyi Tu,Min Chen,Shuxue Zhou,Limin Wu
Transparent superhydrophobic coatings hold significant potential for applications such as windows and reflectors. However, issues such as fragility and high haze have limited their practicality. Drawing inspiration from dragonfly structures, we developed a transparent superhydrophobic coating by etching the polystyrene microsphere array semiembedded on a silicon oxide matrix and subsequently depositing the methyltrichlorosilane-derived nanofilaments. The resulting coating features silicon oxide craters and nanofilaments inspired by dragonfly wings. Due to the coating’s small, multiscale nanostructures, it has a high average visible light transmittance of 90.4% and a low average haze of 4.0%, comparable to the substrate glass. It also exhibits exceptional superhydrophobic properties, with a contact angle of 161.5° and a sliding angle of 1.5°. Notably, the coating retains its superhydrophobicity even after withstanding impacts from 5 kg of water and 500 g of sand, thanks to its robust wing vein-inspired protected structure. Additionally, it shows strong resistance to acids, alkalis, and temperatures up to 400 °C. The coating maintains a high transmittance and low haze after 67 days of UV irradiation or 300 days of outdoor exposure. The combination of low haze and robustness in this transparent superhydrophobic coating highlights its promising potential for applications in related fields.
Transparent superamphiphobic materials have significant attraction in fundamental research and practical applications that demand light transmission and self-cleaning properties. However, the high haze of those traditional transparent superamphiphobic materials, caused by the visible light scattering of the surface rough structures, severely limits their applications on optical surfaces like electronic displays, optical lens, and building windows. Here, a high transparency and ultralow haze superamphiphobic material is reported, based on nanoscale reentrant structures with suppressed microscale structure, which is the main cause of haze. Nanoscale roughness effectively reduces visible light scattering, thus reducing haze (0.8%, nearly the same as pristine glass) and improving light transmittance (90.4%), and the material remains super-repellent to water and oils with excellent anti-fouling properties. This highly transparent and ultralow haze superamphiphobic material is expected to be be attractive in areas like optical devices, displays, windows and the photovoltaic industry.
Wang Meng-Yun,Zhang Yue,Wang Dan,Yao Ming,Wang Yi-Xuan,Zhou Xing-Ping,Peng Hai-Yan,Xie Xiao-Lin
Holographic optical elements (HOEs) based on polymer composites have become a research hot spot in recent years for augmented reality (AR) due to the significant improvement of optical performance, dynamic range, ease of processing and high yield rate. Nevertheless, it remains a formidable challenge to obtain a large field of view (FOV) and brightness due to the limited refractive index modulation. Herein, we report an effective method to tackle the challenge by doping an epoxy liquid crystal termed E6M, which enables a large refractive index modulation of 0.050 @ 633 nm and low haze of 5.0% at a doping concentration of 5 wt%. This achievement may be ascribed to the improved molecular ordering of liquid crystals within the holographic polymer composites. The high refractive index modulation can endow transmission-type holographic polymer composites with a high diffraction efficiency of 96.2% at a small thickness of 5 µm, which would promise the design of thin and lightweight AR devices.
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