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https://hdl.handle.net/2440/87953
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Type: | Conference paper |
Title: | Diatom culture media contain extracellular silica nanoparticles which form opalescent films |
Author: | Losic, D. Mitchell, J. Voelcker, N. |
Citation: | Proceedings of SPIE, 2008 / Voelcker, N.H., Thissen, H.W. (ed./s), vol.7267, pp.726712-1-726712-8 |
Publisher: | SPIE |
Publisher Place: | Australia |
Issue Date: | 2008 |
Series/Report no.: | Proceedings of SPIE |
ISBN: | 9780819475190 |
ISSN: | 0277-786X 1996-756X |
Conference Name: | SPIE: Smart Materials, Nano+Micro-Smart Systems (10 Dec 2008 - 12 Dec 2008 : Melbourne, VIC) |
Editor: | Voelcker, N.H. Thissen, H.W. |
Statement of Responsibility: | Dusan Losic, James G. Mitchell, Nicolas H. Voelcker |
Abstract: | Diatoms are unicellular photosynthetic algae with enormous diversity of patterns in their silica structures at the nano- to micronscale. In this study, we present results, which support the hypothesis that silica nanoparticles are released into the diatom culture medium. Formation of an opalescent film by the self-assembly of silica nanoparticles produced in the growth medium of diatoms. This film was formed on the filter paper from the culture medium of a Coscinodiscus sp. culture. A number of diatoms with partially opened valves were observed on the film surface under light microscopy and SEM, which indicates that cell contents inside of diatoms had been released into the culture solution. AFM images of produced an opalescent films show ordered arrays of silica nanoparticles with different diameters depending on the colors observed by light microscopy. The film forming silica nanoparticles are either released by the diatoms during reproduction or after cell death This approach provides an environmentally friendly means for fabricating silica nanoparticles, decorative coatings and novel optical materials. © 2008 SPIE. |
Keywords: | diatoms; Coscinodiscus sp. silica nanoparticles; biomineralisation; artificial opal films |
Rights: | © 2008 SPIE |
DOI: | 10.1117/12.811321 |
Published version: | http://dx.doi.org/10.1117/12.811321 |
Appears in Collections: | Aurora harvest 2 Chemical Engineering publications |
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