Small angle neutron scattering on an absolute intensity scale and the internal surface of diatom frustules from three species of differing morphologies

Simple item page
dc.contributor.authorGarvey, CJen_AU
dc.contributor.authorStrobl, Men_AU
dc.contributor.authorPercot, Aen_AU
dc.contributor.authorŠaroun, Jen_AU
dc.contributor.authorHaug, Jen_AU
dc.contributor.authorVyverman, Wen_AU
dc.contributor.authorChepurnov, VAen_AU
dc.contributor.authorFerris, JMen_AU
dc.date.accessioned2013-11-19T23:00:21Zen_AU
dc.date.available2013-11-19T23:00:21Zen_AU
dc.date.issued2013-05-01en_AU
dc.date.statistics2013-11-20en_AU
dc.description.abstractThe internal nanostructure of the diatoms Cyclotella meneghiniana, Seminavis robusta and Achnanthes subsessilis was investigated using small angle neutron scattering (SANS) to examine thin biosilica samples, consisting of isotropic (powder) from their isolated cell walls. The interpretation of SANS data was assisted by several other measurements. The N-2 adsorption, interpreted within the Branuer-Emmet-Teller isotherm, yielded the specific surface area of the material. Fourier transform infrared (FTIR) and Raman spectroscopy indicates that the isolated material is amorphous silica with small amounts of organic cell wall materials acting as a filling material between the silica particles. A two-phase (air and amorphous silica) model was used to interpret small angle neutron scattering data. After correction for instrumental resolution, the measurements on two SANS instruments covered an extended range of scattering vectors 0.0011 nm(-1) < q < 5.6 nm(-1), giving an almost continuous SANS curve over a range of scattering vectors, q, on an absolute scale of intensity for each sample. Each of the samples gave a characteristic scattering curve where log (intensity) versus log (q) has a -4 dependence, with other features superimposed. In the high-q regime, departure from this behaviour was observed at a length-scales equivalent to the proposed unitary silica particle. The limiting Porod scattering law was used to determine the specific area per unit of volume of each sample illuminated by the neutron beam. The Porod behaviour, and divergence from this behaviour, is discussed in terms of various structural features and the proposed mechanisms for the bio-assembly of unitary silica particles in frustules. © 2013, Springer.en_AU
dc.identifier.citationGarvey, C. J., Strobl, M., Percot, A., Šaroun, J., Haug, J., Vyverman, W., Chepurnov, V. A., & Ferris, J. M. (2013). Small angle neutron scattering on an absolute intensity scale and the internal surface of diatom frustules from three species of differing morphologies. European Biophysics Journal with Biophysics Letters, 42 (5), 395-404. doi:10.1007/s00249-013-0889-xen_AU
dc.identifier.govdoc5160en_AU
dc.identifier.issn0175-7571en_AU
dc.identifier.issue5en_AU
dc.identifier.journaltitleEuropean Biophysics Journal with Biophysics Lettersen_AU
dc.identifier.pagination395-404en_AU
dc.identifier.urihttp://dx.doi.org/10.1007/s00249-013-0889-xen_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/4979en_AU
dc.identifier.volume42en_AU
dc.language.isoenen_AU
dc.publisherSpringeren_AU
dc.subjectDiffusionen_AU
dc.subjectRaman spectroscopyen_AU
dc.subjectSmall angle scatteringen_AU
dc.subjectNeutronsen_AU
dc.subjectVectorsen_AU
dc.subjectSilicaen_AU
dc.titleSmall angle neutron scattering on an absolute intensity scale and the internal surface of diatom frustules from three species of differing morphologiesen_AU
dc.typeJournal Articleen_AU
Files
License bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description:
Download
Collections
Journal Articles