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Studies of black silicon and black diamond as materials for antibacterial surfaces

Hazell, G ; May, P W ; Taylor, P ; Nobbs, A H ; Welch, C C ; Su, B

Biomaterials science, 2018-01, Vol.6 (6), p.1424-1432 [Periódico revisado por pares]

England: Royal Society of Chemistry

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Studies of black silicon and black diamond as materials for antibacterial surfaces
Autor: Hazell, G ; May, P W ; Taylor, P ; Nobbs, A H ; Welch, C C ; Su, B
Assuntos: Anti-Bacterial Agents - chemistry ; Anti-Bacterial Agents - pharmacology ; Antibacterial materials ; Bacteria ; Bacterial Infections - prevention & control ; Biocompatible Materials - chemistry ; Biocompatible Materials - pharmacology ; Boron Compounds - chemistry ; Boron Compounds - pharmacology ; Chemical vapor deposition ; Diamond - chemistry ; Diamond - pharmacology ; Diamond films ; Diamonds ; E coli ; Escherichia coli - drug effects ; Humans ; Motility ; Nanostructure ; Nanostructures - chemistry ; Needles ; Plasma etching ; Sharpness ; Silicon ; Silicon - chemistry ; Silicon - pharmacology ; Streptococcus gordonii - drug effects ; Surface Properties
É parte de: Biomaterials science, 2018-01, Vol.6 (6), p.1424-1432
Descrição: 'Black silicon' (bSi) samples with surfaces covered in nanoneedles of varying length, areal density and sharpness, have been fabricated using a plasma etching process. These nanostructures were then coated with a conformal uniform layer of diamond using hot filament chemical vapour deposition to produce 'black diamond' (bD) surfaces. The effectiveness of these bSi and bD surfaces in killing Gram-negative (E. coli) and Gram-positive (S. gordonii) bacteria was investigated by culturing the bacteria on the surfaces for a set time and then measuring the live-to-dead ratio. All the nanostructured surfaces killed E. coli at a significantly higher rate than the respective flat Si or diamond control samples. The length of the needles was found to be less important than their separation, i.e. areal density. This is consistent with a model for mechanical bacteria death based on the stretching and disruption of the cell membrane, enhanced by the cells motility on the surfaces. In contrast, S. gordonii were unaffected by the nanostructured surfaces, possibly due to their smaller size, thicker cell membrane and/or their lack of motility.
Editor: England: Royal Society of Chemistry
Idioma: Inglês

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Studies of black silicon and black diamond as materials for antibacterial surfaces

Hazell, G ; May, P W ; Taylor, P ; Nobbs, A H ; Welch, C C ; Su, B

England: Royal Society of Chemistry

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