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

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F12%3A43894339" target="_blank" >RIV/60461373:22310/12:43894339 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/61389013:_____/12:00379050

Výsledek na webu

<a href="http://dx.doi.org/10.1021/jp300181q" target="_blank" >http://dx.doi.org/10.1021/jp300181q</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/jp300181q" target="_blank" >10.1021/jp300181q</a>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

CF - Fyzikální chemie a teoretická chemie

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2012

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Physical Chemistry C

ISSN

1932-7447

e-ISSN

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Svazek periodika

116

Číslo periodika v rámci svazku

27

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

11

Strana od-do

14627-14637

Kód UT WoS článku

000306303800050

EID výsledku v databázi Scopus

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