About: Insights into the Structural Transformations of Aluminosilicate Inorganic Polymers: A Comprehensive Solid-State NMR Study

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
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. (en)
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 (en)
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 (en)
skos:notation	RIV/60461373:22310/12:43894339!RIV13-MSM-22310___
http://linked.open...avai/predkladatel	Fakulta chemické technologie
http://linked.open...avai/riv/aktivita	I P Z
http://linked.open...avai/riv/aktivity	I, P(GAP108/10/1980), P(IAA400400904), Z(AV0Z40500505), Z(MSM6046137302)
http://linked.open...iv/cisloPeriodika	27
http://linked.open...vai/riv/dodaniDat	2013
http://linked.open...aciTvurceVysledku	Koloušek, David
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Vysoká škola chemicko-technologická v Praze / Fakulta chemické technologie
http://linked.open...dnocenehoVysledku	142010
http://linked.open...ai/riv/idVysledku	RIV/60461373:22310/12:43894339
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	water; phase transition; inorganic polymers (en)
http://linked.open.../riv/klicoveSlovo	phase transition water inorganic polymers
http://linked.open...odStatuVydavatele	US - Spojené státy americké
http://linked.open...ontrolniKodProRIV	[9C7BC3FD4683]
http://linked.open...i/riv/nazevZdroje	Journal of Physical Chemistry C
http://linked.open...in/vavai/riv/obor	CF
http://linked.open...ichTvurcuVysledku	1 (xsd:int)
http://linked.open...cetTvurcuVysledku	5 (xsd:int)
http://linked.open...vavai/riv/projekt	Composite materials derived from inorganic polymers reinforced by polymer fibres NMR crystallography of extraframework sites in silicon rich zeolites
http://linked.open...UplatneniVysledku	2012
http://linked.open...v/svazekPeriodika	116
http://linked.open...iv/tvurceVysledku	Kotek, Jiří Urbanová, Martina Brus, Jiří Kobera, Libor Koloušek, David
http://linked.open...ain/vavai/riv/wos	000306303800050
http://linked.open...n/vavai/riv/zamer	Progresivní makromolekulární materiály a supramolekulární systémy: syntéza a studium vlastností, jevů a možností využití pro speciální aplikace a moderní technologie Preparation and research of functional materials and material technologies using micro- and nanoscopic methods
issn	1932-7447
number of pages	11 (xsd:int)
http://bibframe.org/vocab/doi	10.1021/jp300181q
http://localhost/t...ganizacniJednotka	22310
is http://linked.open...avai/riv/vysledek of	Insights into the Structural Transformations of Aluminosilicate Inorganic Polymers: A Comprehensive Solid-State NMR Study

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