Studies of black silicon and black diamond as materials for antibacterial surfaces
| Autor: | Gavin Hazell, Paul W May, Angela H. Nobbs, P Taylor, Colin Welch, Bo Su |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Boron Compounds
Silicon Nanostructure Materials science Surface Properties Black diamond Biomedical Engineering Biocompatible Materials 02 engineering and technology Chemical vapor deposition engineering.material 010402 general chemistry 01 natural sciences Colloid chemistry.chemical_compound Escherichia coli Humans General Materials Science Area density Plasma etching Black silicon Diamond Bacterial Infections 021001 nanoscience & nanotechnology Anti-Bacterial Agents Nanostructures 0104 chemical sciences Antibacterial Chemical engineering chemistry Streptococcus gordonii engineering 0210 nano-technology Layer (electronics) |
| Zdroj: | Hazell, G, May, P, Taylor, P, Nobbs, A, Welch, C & Su, B 2018, ' Studies of black silicon and black diamond as materials for antibacterial surfaces ', Biomaterials Science, vol. 6, no. 6, pp. 1424-1432 . https://doi.org/10.1039/C8BM00107C, https://doi.org/10.1039/c8bm00107c |
| DOI: | 10.1039/C8BM00107C |
| Popis: | '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. |
| Databáze: | OpenAIRE |
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