Goswami, Debmita and Medda, Samar Kumar and De, Goutam (2011) Superhydrophobic Films on Glass Surface Derived from Trimethylsilanized Silica Gel Nanoparticles. ACS Applied Materials & Interfaces, 3 (9). pp. 3440-3447. ISSN 1944-8244

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The paper deals with the fabrication of sol gel-derived superhydrophobic films on glass based on the macroscopic silica network with surface modification. The fabricated transparent films were composed of a hybrid -Si(CH(3))(3)-functionalized SiO(2) nanospheres exhibiting the desired micro/nanostructure, water repellency, and antireflection (AR) property. The wavelength selective AR property can be tuned by controlling the physical thickness of the films. Small-angle X-ray scattering (SAXS) studies revealed the existence of SiO(2) nanoparticles of average size similar to 9.4 nm in the sols. TEM studies showed presence of interconnected SiO(2) NPs of similar to 10 nm in size. The films were formed with uniformly packed SiO(2) aggregates as observed by FESEM of film surface. FTIR of the films confirmed presence of glasslike Si-O-Si bonding and methyl functionalization. The hydrophobicity of the surface was depended on the thickness of the deposited films. A critical film thickness (>115 nm) was necessary to obtain the air push effect for superhydrophobicity. Trimethylsilyl functionalization of SiO(2) and the surface roughness (rms approximate to 30 nm as observed by AFM) of the films were also contributed toward the high water contact angle (WCA). The coated glass surface showed WCA value of the droplet as high as 168 +/- 3 degrees with 6 mu L of water. These superhydrophobic films were found to be stable up to about 230-240 degrees C as confirmed by TG/DTA studies, and WCA measurements of the films with respect to the heat-treatment temperatures. These high water repellant films can be deposited on relatively large glass surfaces to remove water droplets immediately without any mechanical assistance.

Item Type: Article
Uncontrolled Keywords: trimethylsilanized silica nanoparticles; sol-gel dip-coating; superhydrophobic films; water contact angle; antireflection
Subjects: General
Divisions: Nano-Structured Materials
Depositing User: Bidhan Chaudhuri
Date Deposited: 16 Jan 2012 12:11
Last Modified: 25 Feb 2013 08:05
URI: http://cgcri.csircentral.net/id/eprint/245

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