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Superhydrophobic and transparent coatings prepared
by self-assembly of dual-sized silica particles |
| Qian-Feng XU1,Jian-Nong WANG2, |
| 1.Shanghai Key Laboratory
for Laser Processing and Materials Modification, School of Materials
Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240,
China; 2.Shanghai Key Laboratory
for Metallic Functional Materials, Key Laboratory for Advanced Civil
Engineering Materials (Ministry of Education), School of Materials
Science and Engineering, Tongji University, Shanghai 200092, China; |
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Abstract Superhydrophobic and transparent coatings have been prepared by self-assembly of dual-sized silica particles from a mixed dispersion. The desirable micro /nano hierarchical structure for superhydrophobicity is constructed simply by adjusting the size and ratio of the dual-sized particles without organic/inorganic templates. The transparency of the prepared coatings is also researched, and the light scattering can be reduced by lowering the ratio of big sub-micro particles while the superhydrophobicity maintains unchanged. When nano particles with a diameter of 50 nm and sub-micro particles with a diameter of 350 nm are assembled, a superhydrophobic property with a water contact angle of 161° is achieved. Additionally, the coated glass is also very transparent. The highest transmittance of the coated glass can reach 85%. Compared to traditional colloid self-assembly approach, which often involves dozens of steps of layer-by-layer processing and organic/inorganic templates, the present approach is much simpler and has advantages for large-scale coating.
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| Keywords
superhydrophobicity
transparency
dual-sized particles
self-assembly
silica coating
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Issue Date: 05 June 2010
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