Bactericidal activity of black silicon

Ivanova, Elena P., Hasan, Jafar, Webb, Hayden K., Gervinskas, Gediminas, Juodkazis, Saulius, Truong, Vi Khanh, Wu, Alex H.F., Lamb, Robert N., Baulin, Vladimir A., Watson, Gregory S., Watson, Jolanta A., Mainwaring, David E., and Crawford, Russell J. (2013) Bactericidal activity of black silicon. Nature Communications, 4. 2838. pp. 1-7.

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Abstract

Black silicon is a synthetic nanomaterial that contains high aspect ratio nanoprotrusions on its surface, produced through a simple reactive-ion etching technique for use in photovoltaic applications. Surfaces with high aspect-ratio nanofeatures are also common in the natural world, for example, the wings of the dragonfly Diplacodes bipunctata. Here we show that the nanoprotrusions on the surfaces of both black silicon and D. bipunctata wings form hierarchical structures through the formation of clusters of adjacent nanoprotrusions. These structures generate a mechanical bactericidal effect, independent of chemical composition. Both surfaces are highly bactericidal against all tested Gram-negative and Gram-positive bacteria, and endospores, and exhibit estimated average killing rates of up to ~450,000 cells  min−1  cm−2. This represents the first reported physical bactericidal activity of black silicon or indeed for any hydrophilic surface. This biomimetic analogue represents an excellent prospect for the development of a new generation of mechano-responsive, antibacterial nanomaterials.

Item ID: 31705
Item Type: Article (Research - C1)
ISSN: 2041-1723
Keywords: chemical sciences, materials sciences, nanotechnology
Additional Information:

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-nd/3.0/

Funders: Advanced Manufacturing Co-operative Research Centre (AMCRC)
Date Deposited: 26 Feb 2014 10:03
FoR Codes: 02 PHYSICAL SCIENCES > 0299 Other Physical Sciences > 029901 Biological Physics @ 30%
09 ENGINEERING > 0903 Biomedical Engineering > 090301 Biomaterials @ 30%
10 TECHNOLOGY > 1007 Nanotechnology > 100706 Nanofabrication, Growth and Self Assembly @ 40%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970102 Expanding Knowledge in the Physical Sciences @ 30%
97 EXPANDING KNOWLEDGE > 970106 Expanding Knowledge in the Biological Sciences @ 30%
97 EXPANDING KNOWLEDGE > 970109 Expanding Knowledge in Engineering @ 40%
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