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231224s2016 xx ||||| 00| ||eng c |
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|a pubmed25n0870.xml
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|a (NLM)27275135
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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1 |
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|a Grangeon, Sylvain
|e verfasserin
|4 aut
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|a Structure of nanocrystalline calcium silicate hydrates
|b insights from X-ray diffraction, synchrotron X-ray absorption and nuclear magnetic resonance
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|c 2016
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|a Text
|b txt
|2 rdacontent
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|a ohne Hilfsmittel zu benutzen
|b n
|2 rdamedia
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|a Band
|b nc
|2 rdacarrier
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|a Date Revised 29.09.2020
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|a published: Electronic-eCollection
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|a Citation Status PubMed-not-MEDLINE
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|a The structure of nanocrystalline calcium silicate hydrates (C-S-H) having Ca/Si ratios ranging between 0.57 ± 0.05 and 1.47 ± 0.04 was studied using an electron probe micro-analyser, powder X-ray diffraction, 29Si magic angle spinning NMR, and Fourier-transform infrared and synchrotron X-ray absorption spectroscopies. All samples can be described as nanocrystalline and defective tobermorite. At low Ca/Si ratio, the Si chains are defect free and the Si Q3 and Q2 environments account, respectively, for up to 40.2 ± 1.5% and 55.6 ± 3.0% of the total Si, with part of the Q3 Si being attributable to remnants of the synthesis reactant. As the Ca/Si ratio increases up to 0.87 ± 0.02, the Si Q3 environment decreases down to 0 and is preferentially replaced by the Q2 environment, which reaches 87.9 ± 2.0%. At higher ratios, Q2 decreases down to 32.0 ± 7.6% for Ca/Si = 1.38 ± 0.03 and is replaced by the Q1 environment, which peaks at 68.1 ± 3.8%. The combination of X-ray diffraction and NMR allowed capturing the depolymerization of Si chains as well as a two-step variation in the layer-to-layer distance. This latter first increases from ∼11.3 Å (for samples having a Ca/Si ratio <∼0.6) up to 12.25 Å at Ca/Si = 0.87 ± 0.02, probably as a result of a weaker layer-to-layer connectivity, and then decreases down to 11 Å when the Ca/Si ratio reaches 1.38 ± 0.03. The decrease in layer-to-layer distance results from the incorporation of interlayer Ca that may form a Ca(OH)2-like structure, nanocrystalline and intermixed with C-S-H layers, at high Ca/Si ratios
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|a Journal Article
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|a 29Si NMR
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|a C–S–H
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|a X-ray diffraction
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|a calcium silicate hydrates
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|a synchrotron X-ray absorption
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|a Claret, Francis
|e verfasserin
|4 aut
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|a Roosz, Cédric
|e verfasserin
|4 aut
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| 700 |
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|a Sato, Tsutomu
|e verfasserin
|4 aut
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|a Gaboreau, Stéphane
|e verfasserin
|4 aut
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| 700 |
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|a Linard, Yannick
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Journal of applied crystallography
|d 1998
|g 49(2016), Pt 3 vom: 01. Juni, Seite 771-783
|w (DE-627)NLM098121561
|x 0021-8898
|7 nnns
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| 773 |
1 |
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|g volume:49
|g year:2016
|g number:Pt 3
|g day:01
|g month:06
|g pages:771-783
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|d 49
|j 2016
|e Pt 3
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|h 771-783
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