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- W2086184443 abstract "Abstract CuO nanoparticles with average diameter of about 20 nm were accumulated on surface of sol–gel silica thin films heat treated at 300 °C in air. Heat treatment of the CuO nanoparticles at 600 °C in a reducing environment resulted in effective reduction of the nanoparticles and penetration of them into the film. While the thin films heat treated at 300 °C exhibited a strong antibacterial activity against Escherichia coli bacteria, the reducing process decreased their antibacterial activity. However, by definition of normalized antibacterial activity (antibacterial activity/surface concentration of coppers) it was found that Cu nanoparticles were more toxic to the bacteria than the CuO nanoparticles (by a factor of ∼ 2.1). Thus, the lower antibacterial activity of the reduced thin films was assigned to diffusion of the initially accumulated copper-based nanoparticles into the film. The CuO nanoparticles also exhibited a slight photocatalytic activity for inactivation of the bacteria (∼ 22% improvement in their antibacterial activity). Instead, the normalized antibacterial activity of the Cu nanoparticles covered by a thin oxide layer highly increased (∼ 63% improvement) in the photocatalytic process. A mechanism was also proposed to describe the better antibacterial activity of the Cu than CuO nanoparticles in dark and under light irradiation." @default.
- W2086184443 created "2016-06-24" @default.
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- W2086184443 date "2010-09-01" @default.
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- W2086184443 title "Cu and CuO nanoparticles immobilized by silica thin films as antibacterial materials and photocatalysts" @default.
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- W2086184443 doi "https://doi.org/10.1016/j.surfcoat.2010.06.036" @default.
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