Loading...
Studies of black silicon and black diamond as materials for antibacterial surfaces
Hazell, Gavin May, Paul W. Taylor, Paul W. Nobbs, Angela H. Su, Bo
Hazell, Gavin
May, Paul W.
Taylor, Paul W.
Nobbs, Angela H.
Su, Bo
Citations
Altmetric:
Advisors
Editors
Other Contributors
EPub Date
Publication Date
2018-03-27
Submitted Date
Collections
Files
Loading...
Accepted_BSi.pdf
Adobe PDF, 1.15 MB
Other Titles
Abstract
‘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.
Citation
Hazell, G., May, P. W., Taylor, P., Nobbs, A. H. N., & Su, B. (2018). Studies of black silicon and black diamond as materials for antibacterial surfaces. Biomaterials Science, 6, 1424-1432. http://doi.org/10.1039/c8bm00107c
Publisher
Royal Society of Chemistry
Journal
Biomaterials Science
Research Unit
PubMed ID
PubMed Central ID
Type
Article
Language
en
Description
Series/Report no.
ISSN
EISSN
2047-4849