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Polymer-Based Superhydrophobic Coating

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Polymer-Based Superhydrophobic Coating Fabricated from Polyelectrolyte Multilayers of Poly(allylamine hydrochloride) and Poly(acrylic acid)
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  Polymer-Based Superhydrophobic Coating Fabricated from Polyelectrolyte Multilayers of Poly(allylamine hydrochloride) and Poly(acrylic acid)  Introduction   The surface having high hydrophobic  and self-cleaning property is generally found in nature such as lotus leaf. Water droplets roll off the leaf surface, carrying dirt and leaving the surface perfectly clean. We would try to fabricate a similar substrate’s  surface to make it superhydrophobic because of its promising practical applications including water-repellence, self-cleaning and anti-fouling. Techniques used for preparation of the superhydrophobic surface can  be simply classified into two categories. 1. One is making a rough surface from a low surface energy material. 2. The other is modifying a rough surface with a material having low surface energy. The materials having low surface energy used to make the superhydrophobic surface are fluorocarbon, silicones and organic materials (polyethylene, polystyrene, etc.), and inorganic materials (ZnO and TiO 2 ).  Chemicals required: 1.Poly(allylamine hydrochloride) [PAH] 2.Poly(acrylic acid) [PAA] 3.SiO 2   4.TiO 2  5.Fumed SiO 2 6.Ethanol 7.Acetone 8.de-ionized water  9.HCl 10.Silanes 11.Polyethylene 12.Polystyrene Glass Substrates  How to create rough surface?  By mechanical stretching, laser/plasma/chemical etching, lithography, sol-gel processing, layer-by-layer and colloidal assembly.  We would use chemical etching, followed by deposition of oxide nanoparticles such as TiO 2 , colloidal SiO 2  and fumed SiO 2  and finally thin layer of organic molecules (like polystyrene) to further lower the surface energy.  According to the superhydrophobic theory, the substrate surface requires both appropriate surface roughness and low surface energy.  On a rough hydrophobic surface the droplet forms a larger contact angle compared to the smooth surface whereas in hydrophilic surface the contact angle reduces. 
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