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Highly photoactive 2D titanium dioxide nanostructures prepared from lyophilized aqueous colloids of peroxo-polytitanic acid

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    SYSNO ASEP0429129
    Document TypeJ - Journal Article
    R&D Document TypeJournal Article
    Subsidiary JČlánek ve WOS
    TitleHighly photoactive 2D titanium dioxide nanostructures prepared from lyophilized aqueous colloids of peroxo-polytitanic acid
    Author(s) Šubrt, Jan (UACH-T) SAI, RID
    Pulišová, Petra (UACH-T) RID, SAI
    Boháček, Jaroslav (UACH-T) SAI
    Bezdička, Petr (UACH-T) SAI, RID, ORCID
    Pližingrová, Eva (UACH-T) SAI, ORCID
    Volfová, Lenka (UACH-T) SAI, RID
    Kupčík, Jaroslav (UACH-T) SAI, RID, ORCID
    Source TitleMaterials Research Bulletin. - : Elsevier - ISSN 0025-5408
    Roč. 49, JAN (2014), s. 405-412
    Number of pages8 s.
    Languageeng - English
    CountryGB - United Kingdom
    KeywordsOxides ; Layered compounds ; Electron microscopy ; Raman spectroscopy ; X-ray diffraction
    Subject RIVCA - Inorganic Chemistry
    R&D ProjectsGA203/09/1117 GA ČR - Czech Science Foundation (CSF)
    Institutional supportUACH-T - RVO:61388980
    UT WOS000330081400063
    EID SCOPUS84886079700
    DOI10.1016/j.materresbull.2013.09.028
    AnnotationReaction of hydrogen peroxide with suspensions of thoroughly washed precipitates obtained by neutralization of aqueous solution of titanyl sulfate with aqueous ammonia leads to transparent yellow liquids. In this way prepared colloid solution is a two phase system in which, beyond the water phase, also a liquid hydrated peroxo-polytitanic acid component is present. Freeze drying of this colloid liquid provides a foamy material consisting of thin foils of peroxo-polytitanic acid containing small but not negligible amount of chemically bound ammonia. These foams annealed at temperature above similar to 200 degrees C lose water, ammonia and excess of oxygen providing foamy amorphous oxide. At higher temperatures above similar to 280 degrees C the amorphous material crystallizes to anatase which transforms at temperatures >850 degrees C to rutile. The size and shape of the initial leaflets forming the foam is preserved up to similar to 900 degrees C. Slit shaped porosity is formed during annealing. We observed that the annealed material is highly photoactive, probably owing to highly anisotropic shape of anatase aggregates and their perfect crystallinity.
    WorkplaceInstitute of Inorganic Chemistry
    ContactJana Kroneislová, krone@iic.cas.cz, Tel.: 311 236 931
    Year of Publishing2015
Number of the records: 1  

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