Hwang, G;
Patir, A;
Allan, E;
Nair, S;
Parkin, I;
(2017)
Superhydrophobic and White Light-Activated Bactericidal Surface through a Simple Coating.
ACS Applied Materials and Interfaces
, 9
(34)
pp. 29002-29008.
10.1021/acsami.7b05977.
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Abstract
Bacterial adhesion and proliferation on surface give a challenge in medical and industrial fields. Here, a simple one-step technique is reported to fabricate self-cleaning and antibactericidal surfaces. White, blue, and violet paints were produced using titanium dioxide nanoparticles, 1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane (PFOTES), crystal violet, toluidine Blue O, and ethanol solution. All of the painted surfaces showed superhydrophobicity in air, and even after hexadecane oil contamination, they retained water repellency and self-cleaning properties. In an assay of bacterial adhesion, significant reductions (>99.8%) in the number of adherent bacteria were observed for all the painted surfaces. In bactericidal tests, the painted surfaces demonstrated not only bactericidal activity against S. aureus and E. coli in the dark but also induced very potent photosensitisation (>4.4 log reduction in the number of viable bacteria on violet painted surface) under white light illumination. The technique that we developed here is general, and can be used on a wide range of substrates such as paper, glass, polymers, and others.
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