Nano-microstructured, superhydrophobic, and near-infrared antireflective thin films on glass

摘要

Superhydrophobic surfaces were produced on glass with self-cleaning and wide-angle anti-reflection in the near-infrared(1.0-2.1μm). These properties resulted from a combination of surface energy and nano/micro-structured topology basedon silica nanoparticles (NPs), index grading and interference. In a two-layer approach (glass/silica NPs/PTFE), a watercontact angle (WCA) of 169sup°/sup±2sup°/supwas attained with very low hysteresis (≤ 2sup°/sup), as well as high transmittance (93-94% at normal incidence). In a three-layer approach (glass/silica NPs/silica aerogel/PTFE), surfaces were produced with WCA of 158sup°/sup±2sup°/sup, also very low hysteresis (& 5sup°/sup), and significant antireflection. This allowed for a normal transmittance of 99.5% or higher, which decreased less than 2% at +20sup°/sup incidence. These results show that pronounced wide-angle antireflection and self-cleaning properties can be simultaneously attained by proper glass coating. Present advantages and limitations for potential applications are discussed.© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.