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    ZnO nanorod-chitosan composite coatings with enhanced antifouling properties

    Year: 2020

    Journal: Int. J. Biol. Macromol., Volume 162, NOV 1, page 1743–1751

    Authors: Al-Belushi, Mohammed A.; Myint, Myo Tay Zar; Kyaw, Htet Htet; Al-Naamani, Laila; Al-Mamari, Rahma; Al-Abri, Mohammed; Dobretsov, Sergey

    Organizations: [EG/SQU-OT/20/01]

    Keywords: Zinc oxide (ZnO) nanorods; Chitosan-ZnO nanocomposite; Biofouling; Antifouling; Bacteria

    The current study describes the fabrication of chitosan-zinc oxide nanorods composite (CHT/ZnO) on fiberglass panels (support substrate). ZnO nanorods (NRs) with size ranging from 20 to 100 nm and some microrods with an approximate size of 0.5-1 mu mwere grown on fiberglass panels. CHT 1%/ZnO composite had ZnO NRs incorporated into chitosan (CHT) coating while ZnO NRs were not visible in the CHT 2%/ZnO NRs composite. XRD and FTIR results showed the presence of the ZnO and chitosan. The water contact angle decreased from 80 degrees +/- 2 degrees (control) to 65 degrees +/- 2 degrees for CHT 1%/ZnO NRs and 42 +/- 2 degrees for CHT 2%/ZnO NRs composite coatings. The antimicrobial activities of the coated fiberglass panels were investigated using biofilm-forming bacteria Bacillus subtilis and Escherichia coli under both light and dark conditions. CHT/ZnO composite coated fiberglass panels showed the strongest antimicrobial activity compared to chitosan, ZnO NRs coatings, and Zn-based antifouling paint in the experiments with B. subtilis and E. coli under light conditions. The highest antifouling activity was observed for CHT 2%/ZnO composites. CHT/ZnO composites can be good alternatives to the toxic antifouling paints. (C) 2020 Elsevier B.V. All rights reserved.
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