Počet záznamů: 1

High-temperature X-ray powder diffraction as a tool for characterization of smectites, layered double hydroxides, and their intercalates with porphyrins

  1. 1.
    0347201 - UACH-T 2011 RIV NL eng J - Článek v odborném periodiku
    Píšková, A. - Bezdička, Petr - Hradil, David - Káfuňková, E. - Lang, Kamil - Večerníková, Eva - Kovanda, F. - Grygar, Tomáš
    High-temperature X-ray powder diffraction as a tool for characterization of smectites, layered double hydroxides, and their intercalates with porphyrins.
    Applied Clay Science. Roč. 49, č. 4 (2010), s. 363-371 ISSN 0169-1317
    Grant CEP: GA ČR(CZ) GA203/06/1244; GA AV ČR KAN100500651; GA AV ČR IAA3032401
    Výzkumný záměr: CEZ:AV0Z40320502
    Klíčová slova: smectite * Layered double hydroxides * thermal decomposition
    Kód oboru RIV: CB - Analytická chemie, separace
    Impakt faktor: 2.303, rok: 2010

    We have analyzed expandable clay minerals and layered double hydroxides with different interlayer ions by high-temperature X-ray powder diffraction (HT-XRD) with comparison to thermal analysis (DTG/DTA) coupled with evolved gas analysis (EGA). We described in detail their thermal behaviour with emphasis to the differences among samples related to their crystallochemical characteristics. Porphyrin-intercalated smectites have a quite unique thermal behaviour as monitored by HT-XRD; the intercalates with tetrakis (1-methyl-4-pyridinio)porphyrin have a basal spacing of about 1.4 nm and are thermally stable up to ca. 600 degrees C. The resolution of the individual dehydration steps of smectites (from 2-layer hydrate via 1-layer hydrate to the anhydrous form) is much better in HT-XRD then in DTG/EGA curves. Layered double hydroxides (LDHs) have a varying thermal stability depending on their chemical composition and crystallinity.
    Trvalý link: http://hdl.handle.net/11104/0188031