Room temperature synthesis of water repellent silica coatings by the dip coat technique |
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Authors: | Sharad D Bhagat Young-Soo Ahn |
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Institution: | a Department of Chemical Engineering, Pukyong National University, Busan 608 739, South Korea b Korea Institute of Energy Research, Yusong, Taejon 305 600, South Korea |
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Abstract: | The present paper describes the room temperature synthesis of dip coated water repellent silica coatings onto stainless steel substrates using 1,1,1,3,3,3-hexamethyldisilazane as a surface modifying agent. The hydrophobic property of the silica coating was enhanced by increasing its surface roughness, which was achieved by a proper control over the MeOH/TMOS molar ratio (S) during the synthesis. The contact angle of a water droplet (10 μl) increased from 72° to 145° with an increase in the S value from 9.1 to 36.4. The silica coating showed a minimum sliding angle of 15° for a water droplet of 10 μl. The water repellent silica coatings are thermally stable up to a temperature of 340 °C. The results have been discussed by taking into consideration the contact angle measurements, surface morphology and sol-gel parameters. |
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Keywords: | Water repellency Sol-gel Contact angle AFM FTIR TGA-DTA |
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