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Statements

Subject Item
n2:RIV%2F60461373%3A22310%2F12%3A43894339%21RIV13-MSM-22310___
rdf:type
n7:Vysledek skos:Concept
dcterms:description
To clarify the problem of undesired crystallization of amorphous aluminosilicate inorganic polymers (AIPs), we used 27Al MQ/MAS spectroscopy that revealed a two-component character of the prepared AIPs. The prevailing fraction of [AlO4]? species (amorphous phase) is charge-balanced by Na+counterions and exhibits considerable distribution of 27Al chemical shifts induced by the variation of Al?O?Si valence angles. In contrast, the minor fraction of [AlO4]? tetrahedra, which can be attributed to the partially ordered domains, shows a broad distribution of quadrupolar parameters that result from variability in the chemical nature of counterions. The partially ordered domains of the phase-unstable AIPs contained a considerably larger amount of [AlO4]? species charge-balanced by H+. Therefore, we assume that the destabilization of AIPs is associated with the presence of bridging hydroxyl groups (Si?OH+?Al, Bronsted-acid sites) that induce breaking of Si?O?Al bonds. To clarify the problem of undesired crystallization of amorphous aluminosilicate inorganic polymers (AIPs), we used 27Al MQ/MAS spectroscopy that revealed a two-component character of the prepared AIPs. The prevailing fraction of [AlO4]? species (amorphous phase) is charge-balanced by Na+counterions and exhibits considerable distribution of 27Al chemical shifts induced by the variation of Al?O?Si valence angles. In contrast, the minor fraction of [AlO4]? tetrahedra, which can be attributed to the partially ordered domains, shows a broad distribution of quadrupolar parameters that result from variability in the chemical nature of counterions. The partially ordered domains of the phase-unstable AIPs contained a considerably larger amount of [AlO4]? species charge-balanced by H+. Therefore, we assume that the destabilization of AIPs is associated with the presence of bridging hydroxyl groups (Si?OH+?Al, Bronsted-acid sites) that induce breaking of Si?O?Al bonds.
dcterms:title
Insights into the Structural Transformations of Aluminosilicate Inorganic Polymers: A Comprehensive Solid-State NMR Study Insights into the Structural Transformations of Aluminosilicate Inorganic Polymers: A Comprehensive Solid-State NMR Study
skos:prefLabel
Insights into the Structural Transformations of Aluminosilicate Inorganic Polymers: A Comprehensive Solid-State NMR Study Insights into the Structural Transformations of Aluminosilicate Inorganic Polymers: A Comprehensive Solid-State NMR Study
skos:notation
RIV/60461373:22310/12:43894339!RIV13-MSM-22310___
n7:predkladatel
n16:orjk%3A22310
n3:aktivita
n8:Z n8:I n8:P
n3:aktivity
I, P(GAP108/10/1980), P(IAA400400904), Z(AV0Z40500505), Z(MSM6046137302)
n3:cisloPeriodika
27
n3:dodaniDat
n4:2013
n3:domaciTvurceVysledku
n20:2351072
n3:druhVysledku
n21:J
n3:duvernostUdaju
n6:S
n3:entitaPredkladatele
n17:predkladatel
n3:idSjednocenehoVysledku
142010
n3:idVysledku
RIV/60461373:22310/12:43894339
n3:jazykVysledku
n14:eng
n3:klicovaSlova
water; phase transition; inorganic polymers
n3:klicoveSlovo
n9:phase%20transition n9:inorganic%20polymers n9:water
n3:kodStatuVydavatele
US - Spojené státy americké
n3:kontrolniKodProRIV
[9C7BC3FD4683]
n3:nazevZdroje
Journal of Physical Chemistry C
n3:obor
n13:CF
n3:pocetDomacichTvurcuVysledku
1
n3:pocetTvurcuVysledku
5
n3:projekt
n18:IAA400400904 n18:GAP108%2F10%2F1980
n3:rokUplatneniVysledku
n4:2012
n3:svazekPeriodika
116
n3:tvurceVysledku
Kobera, Libor Koloušek, David Kotek, Jiří Urbanová, Martina Brus, Jiří
n3:wos
000306303800050
n3:zamer
n15:MSM6046137302 n15:AV0Z40500505
s:issn
1932-7447
s:numberOfPages
11
n19:doi
10.1021/jp300181q
n12:organizacniJednotka
22310