Transparent water repellent silica films by sol-gel process |
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Authors: | Sunetra L Dhere Charles Kappenstein V Ganesan Pratap B Wagh |
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Institution: | a Air Glass Laboratory, Department of Physics, Shivaji University, Kolhapur 416 004, Maharashtra, India b University of Poitiers, Laboratory of Catalysis in Organic Chemistry, LA CCO, UMR CNRS 6503, Poitiers 86000, France c Laboratoire Des Materiaux et Procedes Catalytiques, Universite Claude Bernard, Lyonl, 43 Boulevard Du11 Novembre 1918, 69622 Villeurbanne Cedex, France d CSR, Indore Centre, University Campus, Khandwa Road, Indore 452 017, Madhyapradesh, India e Applied Physics Division, Bhabha Atomic Research Centre (BARC), Trombay, Mumbai 400 085, India |
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Abstract: | Non-wettable surfaces with high contact angles and facile sliding angle of water droplets have received tremendous attention in recent years. The present paper describes the room temperature (∼27 °C) synthesis of dip coated water repellent silica coatings on glass substrates using iso-butyltrimethoxysilane (iso-BTMS) as a co-precursor. Emphasis is given to the influence of the hydrophobic reagent (iso-BTMS) on the water repellent properties of the silica films. Silica sol was prepared by keeping the molar ratio of tetraethoxysilane (TEOS) precursor, methanol (MeOH) solvent, water (H2O) constant at 1:16.53:8.26 respectively, with 0.01 M NH4F throughout the experiment and the molar ratio of iso-BTMS/TEOS (M) was varied from 0 to 0.965. The effect of M on the surface structure and hydrophobicity has been researched. The static water contact angle values of the silica films increased from 65° to 140° and water sliding angle values decreased from 42° to 16° with an increase in the M value from 0 to 0.965. The water repellent silica films are thermally stable up to a temperature of 280 °C and above this temperature the film shows hydrophilic behavior. The water repellent silica films were characterized by the Fourier Transform Infrared (FT-IR) Spectroscopy, Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM), % of optical transmission, thermal and chemical aging tests, humidity tests, static and dynamic water contact angle measurements. |
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Keywords: | Sol-gel process Hydrophobic Wetting phenomena Transparent Humidity Coatings |
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