Light activated phase transformation of metastable tetragonal nanocrystalline zirconia
| Autor: | M. Skovgaard, Kristoffer Almdal, A. van Lelieveld |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Materials science
Mechanical Engineering Nanocrystalline material Crystallography Tetragonal crystal system Nanocrystal Mechanics of Materials Phase (matter) Volume fraction Materials Chemistry Ceramics and Composites Cubic zirconia Composite material Dispersion (chemistry) Monoclinic crystal system |
| Zdroj: | Journal of Composite Materials. 46:2911-2917 |
| ISSN: | 1530-793X 0021-9983 |
| DOI: | 10.1177/0021998311434359 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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