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Chementator Briefs

By Edited by Gerald Ondrey |

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TiO2 coating An antimicrobial titanium dioxide coating, claimed to be much more effective than previous titanium dioxide coatings, has been developed by a team led by professor Susan Krumdieck of the University of Canterbury (Christchurch, New Zealand; www.canterbury.ac.nz), and researchers from the University of Grenoble Alpes (Grenoble, France; www.univ-grenoble-alpes.fr). TiO2 has received much attention as a possible antimicrobial material due to its photocatalytic activity (PCA) and self-cleaning properties. It has selective spectral absorption in the ultraviolet range, but is transparent to visible light. When titanium is exposed to ultraviolet (UV) light, it breaks down water vapor in air to produce free oxygen radicals, which attack organic matter, such as the membranes of bacterial cells. Krumdieck and her colleagues grow TiO2 coatings directly on stainless steel using a pulsed chemical-vapor deposition (CVD) technique she developed. An ultrasonic atomizer is used to make a fine mist of a TiO2 precursor, which is pulse-sprayed into the CVD chamber. This technique increases the rate at which the TiO2 crystals grow, resulting in a 10-µm-thick coating with an interesting structure: vertical columns of stacked 15–20-nm-thick…
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