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Fouled area of (a) PU coating (R-0: 30.42%), (b) PU coating blended with silica nanoparticle (N/7.0: 3.37%), (c) silane-modified PU coating blended silica nanoparticle (S/7.0: 98.80%) (d) and dual-layer coating with PU and silica nanoparticles in paint thinner (T/20/1.0: 0.06%).
