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

Kelly C. Camargo; Fabiano S. Rodembusch; Alexandre Fassini Michels; Flavio Horowitz

doi:10.1117/12.931312

15 October 2012 Nano-microstructured, superhydrophobic, and near-infrared antireflective thin films on glass

Kelly C. Camargo, Fabiano S. Rodembusch, Alexandre Fassini Michels, Flavio Horowitz

Proceedings Volume 8465, Nanostructured Thin Films V; 84650K (2012) https://doi.org/10.1117/12.931312
Event: SPIE NanoScience + Engineering, 2012, San Diego, California, United States

Abstract

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 based on silica nanoparticles (NPs), index grading and interference. In a two-layer approach (glass/silica NPs/PTFE), a water contact angle (WCA) of 169^°±2^°was attained with very low hysteresis (≤ 2^°), 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 158^°±2^°, also very low hysteresis (< 5^°), and significant antireflection. This allowed for a normal transmittance of 99.5% or higher, which decreased less than 2% at +20^° 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.

Citation Download Citation

Kelly C. Camargo, Fabiano S. Rodembusch, Alexandre Fassini Michels, and Flavio Horowitz "Nano-microstructured, superhydrophobic, and near-infrared antireflective thin films on glass", Proc. SPIE 8465, Nanostructured Thin Films V, 84650K (15 October 2012); https://doi.org/10.1117/12.931312

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