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(a) Aluminum foil coated with CA/rosin (3/1 weight) dispersion containing functionalized ZnO and no PVDF. (b) Aluminum foil coated with PVDF/CA/rosin (5/4/1 weight) dispersion containing functionalized ZnO. (c) Change in elastic modulus and peel strength of nanocomposite coatings as a function of PVDF/CA blend weight ratio and ZnO concentration. Curves: [(1) and ] ZnO, [(2) and ] ZnO, and [(3) and ] ZnO concentration. The overall rosin concentration in all the coatings was .
SEM micrographs of (a) uncoated glass fiber of approximately in diameter. The inset shows the morphology of the coated glass-fiber yarn using dry ZnO nanopowder. (b) Coated glass fibers isolated from the fiberglass cloth. The magnified detail shows the surface micro-/nanostructure of the coating. (c) A bundle of glass fibers with a microporous PVDF/CA/rosin coating filled with unmodified ZnO microparticles (, ).
Sessile water contact angle variation as a function of applied tensile stress. (a) Coatings containing unmodified ZnO nanopowder. The reductions in contact angle were accompanied by flaking of coatings under mechanical stress. The coatings withstood depending on their composition. (b) Coatings containing functionalized ZnO. The contact angle is nearly insensitive to ZnO concentration beyond .
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