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Statements

Subject Item
n2:RIV%2F61389005%3A_____%2F13%3A00393382%21RIV14-AV0-61389005
rdf:type
skos:Concept n7:Vysledek
rdfs:seeAlso
http://link.springer.com/content/pdf/10.1007%2Fs00249-013-0889-x.pdf
dcterms:description
The 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. The 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.
dcterms:title
Small angle neutron scattering on an absolute intensity scale and the internal surface of diatom frustules from three species of differing morphologies Small angle neutron scattering on an absolute intensity scale and the internal surface of diatom frustules from three species of differing morphologies
skos:prefLabel
Small angle neutron scattering on an absolute intensity scale and the internal surface of diatom frustules from three species of differing morphologies Small angle neutron scattering on an absolute intensity scale and the internal surface of diatom frustules from three species of differing morphologies
skos:notation
RIV/61389005:_____/13:00393382!RIV14-AV0-61389005
n7:predkladatel
n8:ico%3A61389005
n4:aktivita
n17:I
n4:aktivity
I
n4:cisloPeriodika
5
n4:dodaniDat
n10:2014
n4:domaciTvurceVysledku
n11:4302885
n4:druhVysledku
n13:J
n4:duvernostUdaju
n19:S
n4:entitaPredkladatele
n12:predkladatel
n4:idSjednocenehoVysledku
105655
n4:idVysledku
RIV/61389005:_____/13:00393382
n4:jazykVysledku
n14:eng
n4:klicovaSlova
biosilica; diffusion limited aggregation; small angle neutron scattering; Raman spectroscopy; infrared spectroscopy; Porod law; BET isotherm; biomineralisation
n4:klicoveSlovo
n5:infrared%20spectroscopy n5:biomineralisation n5:Porod%20law n5:biosilica n5:BET%20isotherm n5:Raman%20spectroscopy n5:diffusion%20limited%20aggregation n5:small%20angle%20neutron%20scattering
n4:kodStatuVydavatele
US - Spojené státy americké
n4:kontrolniKodProRIV
[0AAD16B0F548]
n4:nazevZdroje
European Biophysics Journal With Biophysics Letters
n4:obor
n15:BM
n4:pocetDomacichTvurcuVysledku
1
n4:pocetTvurcuVysledku
8
n4:rokUplatneniVysledku
n10:2013
n4:svazekPeriodika
42
n4:tvurceVysledku
Vyverman, W. Šaroun, Jan Ferris, J. M. Garvey, C. J. Chepurnov, V. A. Haug, J. Strobl, M. Percot, A.
n4:wos
000319221400008
s:issn
0175-7571
s:numberOfPages
10
n16:doi
10.1007/s00249-013-0889-x