Deposition,characterization, and enhanced adherence of Escherichia coli bacteria on flame sprayed photocatalytic titania-hydroxyapatite coatings

2014中国功能材料科技与产业高层论坛——Nanostructured titania has been extensively investi¬gated as photocatalytic material and is capable of killing bacteria attached on its surface. The persistent challenge yet is how to effectively promote adhesion of bacteria on its surface for consequent extermination. This research deals with liquid flame sprayed nanos¬tructured titania -hydroxyapatite (HA) coatings. Addi¬tion of HA alleviated phase transformation of titania from anatase to rutile during the coating deposition, reducing rutile to antase ratio from 9.58= to 1.99%, and precluded effectively aggregation of the nano tita- nia particles in the as-sprayed coatings. Adherence of Escherichia coli bacteria on the coatings showed sig¬nificant dependence on content of HA and increased HA content resulted in enhanced attachment of the bacteria. Examination of the photocatalytic activity of the coatings through decomposition of methylene blue dye in water revealed that addition of HA did not markedly deteriorate the photocatalytic performances of the coatings. The unambiguous evidence provided in this work suggests that the coatings made from combination of biocompatible HA and photocatalytic nano titania have great potential for anti -bacterium applications.

关键词： 纳米二氧化钛 杀菌 光催化 薄膜 涂层 2014中国功能材料科技与产业高层论坛

主讲人：研究员 李华 机构：中国科学院宁波材料技术与工程研究所表面工程事业部

时长：0:13:03 年代：2014年