Antifogging antireflective coatings on Fresnel lenses by integrating solid and mesoporous silica nanoparticles

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• 作者：Gang Zhou^a ; ^b ; Junhui He^a ; ^{jhhe@mail.ipc.ac.cn} ; Ligang Xu^a ; ^b
• 关键词：Fresnel lens ; Spin-coating ; Antireflective ; Superhydrophilic ; Antifogging
• 刊名：Microporous and Mesoporous Materials
• 出版年：2013
• 出版时间：August, 2013
• 年：2013
• 卷：176
• 期：Complete
• 页码：41-47
• 全文大小：1893 K

文摘

Antifogging antireflective coatings were fabricated on Fresnel lenses by integrating solid silica nanoparticles (SSNs) and mesoporous silica nanoparticles (MSNs) via spin-coating assembly without any high temperature post-treatments. Superhydrophilicity and a maximum transmittance of 96.4 % was achieved in the visible spectral range for the (MSNs)₄ coating deposited on Fresnel lens. The maximum transmittance even reached as high as 98.5 % in the visible spectral range for the (SSNs)₁/(MSNs)₂ (i.e., 1 layer of SSNs and 2 layers of MSNs) coating by using the (SSNs)₁ coated Fresnel lens instead of uncoated Fresnel lens as the substrate, while superhydrophilicity was well retained. Transmission electron microscopy (TEM) was used to observe the morphology and structure of nanoparticles. Optical properties were characterized by a UV-vis-NIR spectrophotometer. Surface wettability was studied by a contact angle/interface system. Surface morphologies and structures of coatings were examined by scanning electron microscopy (SEM) and atomic force microscopy (AFM). The influences of surface morphology and structure on the optical and wetting properties of coatings were also discussed. The coverage of MSNs was considered to significantly influence both the light transmission and hydrophilicity of coated Fresnel lenses.