Light activated phase transformation of metastable tetragonal nanocrystalline zirconia

Mette Skovgaard Nielsen, Kristoffer Almdal, A van Lelieveld

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    This study searches for small molecules, which can be generated by photoacid generators (PAGs) capable of inducing the tetragonal-to-monoclinic transformation in zirconia nanocrystals. Metastable tetragonal zirconia nanocrystals were exposed in alcohol suspension. X-ray diffraction analysis showed that water, HCl, HF, and NH3, all initiate phase transformation of tetragonal zirconia at room temperature, whereas NBu4Cl and NBu4OH do not. 2-(4-Methoxystyryl)-4,6-bis(trichloromethyl)-1,3,5-triazine) was the most efficient (monoclinic volume fraction reached 0.57) out of the four tested PAGs. For dispersion in a dimethacrylate matrix together with zirconia crystals, a monoclinic volume fraction of 0.19 was observed after 2 min of exposure to light, increasing to 0.6 after 30 min.
    Original languageEnglish
    JournalJournal of Composite Materials
    Volume46
    Issue number23
    Pages (from-to)2911-2917
    ISSN0021-9983
    DOIs
    Publication statusPublished - 2012

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