Metal ion as probes for the characterization of geopolymer materials

Kód výsledku v IS VaVaI

RIV/62243136:_____/08:#0000096 - isvavai.cz

Výsledek na webu

—

DOI - Digital Object Identifier

—

Jazyk výsledku

angličtina

Název v původním jazyce

Metal ion as probes for the characterization of geopolymer materials

Popis výsledku v původním jazyce

Ion exchange of Na+ in geopolymer by Cs+, NH4+ and Co2+ was used to characterize the accessibility of the inner volume of a geopolymer and the size of the rings controlling the mobility of cations in the geopolymer matrix. UV-Vis spectroscopy of Co2+ ions in the Co2+ exchanged samples was used to characterize local structures serving as cationic sites of Co2+ ions in the geopolymer. Na-geopolymer exhibits ion-exchange properties similar to those of zeolites. All Na+ ions could be ion-exchanged by NH4+ or Co2+ ions. This indicates that all the Al atoms are accessible through rings containing at least eight Al and Si atoms. On contrary, Cs+ ion exchange evidence that only one half of the Al atoms are simultaneously accessible through ten- or larger rings. Co2+ ions in the geopolymer network are accommodated in two types of deformed six- or eight-rings. Neither regular six-rings nor the hexagonal prisms are present in the geopolymer network.

Název v anglickém jazyce

Metal ion as probes for the characterization of geopolymer materials

Popis výsledku anglicky

Ion exchange of Na+ in geopolymer by Cs+, NH4+ and Co2+ was used to characterize the accessibility of the inner volume of a geopolymer and the size of the rings controlling the mobility of cations in the geopolymer matrix. UV-Vis spectroscopy of Co2+ ions in the Co2+ exchanged samples was used to characterize local structures serving as cationic sites of Co2+ ions in the geopolymer. Na-geopolymer exhibits ion-exchange properties similar to those of zeolites. All Na+ ions could be ion-exchanged by NH4+ or Co2+ ions. This indicates that all the Al atoms are accessible through rings containing at least eight Al and Si atoms. On contrary, Cs+ ion exchange evidence that only one half of the Al atoms are simultaneously accessible through ten- or larger rings. Co2+ ions in the geopolymer network are accommodated in two types of deformed six- or eight-rings. Neither regular six-rings nor the hexagonal prisms are present in the geopolymer network.

Druh

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

CEP obor

JN - Stavebnictví

OECD FORD obor

—

Projekt

FT-TA4/068: *Pokročilé vyztužené geopolymerní kompozity pro technické využití.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2008

Kód důvěrnosti údajů

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

Název periodika

Journal of American Ceramic Society

ISSN

1551-2916

e-ISSN

—

Svazek periodika

2008

Číslo periodika v rámci svazku

91(9)

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

6

Strana od-do

—

Kód UT WoS článku

—

EID výsledku v databázi Scopus

—