Superhydrophobic Coating

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   CH2112  –  WASTE WATER TREATMENT - PHYSICAL UNIT OPERATION & CHEMICAL UNIT PROCESSES  SRM University Super-Hydrophobic Coating on Fiberglass Cloth for Selective Removal of Oil from water Deli Zang, Feng Liu, Ming Zhang, Xiaogang Niu, Zhengxin Gao, Chengyu Wang Chemical Engineering Journal, 24 September 2014   MATERIALS USED ã Fiberglass cloth (obtained locally) ã Amino-silica particles ã Bisphenol - A epoxy resin (E-54) [as caking agent] ã Octadecyltrichlorosilane (OTS) [for hydrophobization] PROCESSES INVOLVED ã Fabrication of amino-silica particles ã Synthesis of superhydrophobic fiberglass cloth ã Characterizations  –   SEM, and water contact angles (CAs) ã Application in water-oil separation  FABRICATION OF AMINO-SILICA PARTICLES (Sol-gel process) ã 10 mL of ammonia solution (28.0%, catalyst) mixture of 180 mL anhydrous ethanol, 20 mL Tetraethoxysilane (TEOS) and 20 mL deionized water (under magnetic stirring for 2 h) ã Reaction left at room temperature for 12 h. Silica particles were separated from the turbid liquid  by centrifugation, purified by ethanol to remove unreacted substance, and then dried in an oven at 50 o C  ã In the next process, 5 mL 3-Aminopropyltriethoxysilane (APS)  beaker containing 5 mL deionized water and 25 mL anhydrous ethanol under magnetic stirring to form APS hydrolysate. ã  Afterwards, APS hydrolysate (added dropwise) 100 mL anhydrous ethanol solution with 4.0 g silica via 12 h of magnetic stirring at 60 o C. ã Finally, the amino-silica particles were successfully obtained through centrifugation in ethanol and drying at 60 o C for 10 h. 
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