"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." . "diffuse-reflectance spectroscopy; pentasil-containing; zeolites"@en . "Sobal\u00EDk, Zden\u011Bk" . . . "6"^^ . . "378684" . . . "P(FI-IM/079), P(FT-TA4/068), P(GA203/05/2309), Z(AV0Z40320502), Z(AV0Z40400503)" . "Journal of the American Ceramic Society" . . "0002-7820" . "[176EAAA74DDE]" . . "5"^^ . "Metal ions as probes for characterization of geopolymer materials"@en . . . . "Ionty kov\u016F jako sondy pro charakterizaci geopolymern\u00EDch materi\u00E1l\u016F"@cs . "Metal ions as probes for characterization of geopolymer materials" . "Bortnovsky, O." . "RIV/61388980:_____/08:00315574" . . . . "RIV/61388980:_____/08:00315574!RIV09-AV0-61388980" . "Iontov\u00E1 v\u00FDm\u011Bna Na+ v geopolymeru Cs+, NH4+ a Co2+ ionty byla u\u017Eita k vy\u0161et\u0159ov\u00E1n\u00ED p\u0159\u00EDstupnosti vnit\u0159n\u00EDho objemu geopolymeru a roym\u011Br\u016F kruh\u016F kontroluj\u00EDc\u00EDch pohyb iont\u016F v geopolymern\u00ED matrici. UV-Vis spektroskopie Co2+ iont\u016F v Co2+ vym\u011Bn\u011Bn\u00FDch vzorc\u00EDch slou\u017Eila k charakterizaci lok\u00E1ln\u00EDch struktur tvo\u0159\u00EDc\u00EDch kationtov\u00E9 polohy Co2+ iont\u016F v geopolymerech. Na-geopolymery vykazuj\u00ED iontov\u011B-v\u00FDm\u011Bnn\u00E9 vlastnosti obdobn\u00E9 jako u zeolit\u016F. V\u0161echny Na+ ionty mohou b\u00FDt vym\u011Bn\u011Bny NH4+ nebo Co2+ ionty. V\u0161echny Al atomy jsou tud\u00ED\u017E p\u0159\u00EDstupn\u00E9 kruhy tvo\u0159en\u00FDmi alespo\u0148 8 Al (Si) atomy. Na druhou stranu, v\u00FDm\u011Bna Cs+ ukazuje, \u017Ee pouze jedna polovina Al atom\u016F je p\u0159\u00EDstupn\u00E1 skrz deseti\u010Detn\u00E9 nebo v\u011Bt\u0161\u00ED kruhy. Co2+ ionty jsou v geopolymeru lokalizov\u00E1ny ve dvou typech deformov\u00FDn\u00FDch \u0161esti nebo osmi\u010Detn\u00FDch kruh\u016F. Pravideln\u00E9 \u0161est\u010Detn\u00E9 kruhy a hexagon\u00E1ln\u00ED prizmata nejsou v geopolymern\u00ED s\u00EDti p\u0159\u00EDtomny."@cs . "91" . "000259151000042" . "D\u011Bde\u010Dek, Ji\u0159\u00ED" . . "Metal ions as probes for characterization of geopolymer materials" . . "US - Spojen\u00E9 st\u00E1ty americk\u00E9" . . "Metal ions as probes for characterization of geopolymer materials"@en . . "Ionty kov\u016F jako sondy pro charakterizaci geopolymern\u00EDch materi\u00E1l\u016F"@cs . . "9" . "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."@en . "Tvar\u016F\u017Ekov\u00E1, Zdenka" . . "\u0160ubrt, Jan" . "1"^^ . .