Durable Superhydrophobic and Antireflective Surfaces by Trimethylsilanized Silica Nanoparticles-Based Sol−Gel Processing

详细信息    查看全文

• 作者：Michele Manca ; Alessandro Cannavale ; Luisa De Marco ; Antonino S. Aric ; Roberto Cingolani ; Giuseppe Gigli
• 刊名：Langmuir
• 出版年：2009
• 出版时间：June 2, 2009
• 年：2009
• 卷：25
• 期：11
• 页码：6357-6362
• 全文大小：1048K
• 年卷期：v.25,no.11(June 2, 2009)
• ISSN：1520-5827

文摘

We present a robust and cost-effective coating method to fabricate long-term durable superhydrophobic andsimultaneouslyantireflective surfaces by a double-layer coating comprising trimethylsiloxane (TMS) surface-functionalized silica nanoparticles partially embedded into an organosilica binder matrix produced through a sol−gel process. A dense and homogeneous organosilica gel layer was first coated onto a glass substrate, and then, a trimethylsilanized nanospheres-based superhydrophobic layer was deposited onto it. After thermal curing, the two layers turned into a monolithic film, and the hydrophobic nanoparticles were permanently fixed to the glass substrate. Such treated surfaces showed a tremendous water repellency (contact angle = 168°) and stable self-cleaning effect during 2000 h of outdoor exposure. Besides this, nanotextured topology generated by the self-assembled nanoparticles-based top layer produced a fair antireflection effect consisting of more than a 3% increase in optical transmittance.