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  • 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.
  • 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)
  • Iontová výměna Na+ v geopolymeru Cs+, NH4+ a Co2+ ionty byla užita k vyšetřování přístupnosti vnitřního objemu geopolymeru a royměrů kruhů kontrolujících pohyb iontů v geopolymerní matrici. UV-Vis spektroskopie Co2+ iontů v Co2+ vyměněných vzorcích sloužila k charakterizaci lokálních struktur tvořících kationtové polohy Co2+ iontů v geopolymerech. Na-geopolymery vykazují iontově-výměnné vlastnosti obdobné jako u zeolitů. Všechny Na+ ionty mohou být vyměněny NH4+ nebo Co2+ ionty. Všechny Al atomy jsou tudíž přístupné kruhy tvořenými alespoň 8 Al (Si) atomy. Na druhou stranu, výměna Cs+ ukazuje, že pouze jedna polovina Al atomů je přístupná skrz desetičetné nebo větší kruhy. Co2+ ionty jsou v geopolymeru lokalizovány ve dvou typech deformovýných šesti nebo osmičetných kruhů. Pravidelné šestčetné kruhy a hexagonální prizmata nejsou v geopolymerní síti přítomny. (cs)
Title
  • Metal ions as probes for characterization of geopolymer materials
  • Ionty kovů jako sondy pro charakterizaci geopolymerních materiálů (cs)
  • Metal ions as probes for characterization of geopolymer materials (en)
skos:prefLabel
  • Metal ions as probes for characterization of geopolymer materials
  • Ionty kovů jako sondy pro charakterizaci geopolymerních materiálů (cs)
  • Metal ions as probes for characterization of geopolymer materials (en)
skos:notation
  • RIV/61388980:_____/08:00315574!RIV09-AV0-61388980
http://linked.open...avai/riv/aktivita
http://linked.open...avai/riv/aktivity
  • P(FI-IM/079), P(FT-TA4/068), P(GA203/05/2309), Z(AV0Z40320502), Z(AV0Z40400503)
http://linked.open...iv/cisloPeriodika
  • 9
http://linked.open...vai/riv/dodaniDat
http://linked.open...aciTvurceVysledku
http://linked.open.../riv/druhVysledku
http://linked.open...iv/duvernostUdaju
http://linked.open...titaPredkladatele
http://linked.open...dnocenehoVysledku
  • 378684
http://linked.open...ai/riv/idVysledku
  • RIV/61388980:_____/08:00315574
http://linked.open...riv/jazykVysledku
http://linked.open.../riv/klicovaSlova
  • diffuse-reflectance spectroscopy; pentasil-containing; zeolites (en)
http://linked.open.../riv/klicoveSlovo
http://linked.open...odStatuVydavatele
  • US - Spojené státy americké
http://linked.open...ontrolniKodProRIV
  • [176EAAA74DDE]
http://linked.open...i/riv/nazevZdroje
  • Journal of the American Ceramic Society
http://linked.open...in/vavai/riv/obor
http://linked.open...ichTvurcuVysledku
http://linked.open...cetTvurcuVysledku
http://linked.open...vavai/riv/projekt
http://linked.open...UplatneniVysledku
http://linked.open...v/svazekPeriodika
  • 91
http://linked.open...iv/tvurceVysledku
  • Dědeček, Jiří
  • Sobalík, Zdeněk
  • Tvarůžková, Zdenka
  • Šubrt, Jan
  • Bortnovsky, O.
http://linked.open...ain/vavai/riv/wos
  • 000259151000042
http://linked.open...n/vavai/riv/zamer
issn
  • 0002-7820
number of pages
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