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Synthesis and thermal stability of ZrO2SiO2 core-shell submicron particles
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| Veröffentlicht in: | RSC Advances 9(2019), 46, Seite 26902-26914 |
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| Personen und Körperschaften: | , , , , , , , , , , , |
| Titel: | Synthesis and thermal stability of ZrO2SiO2 core-shell submicron particles/ Maik Finsel, Maria Hemme, Sebastian Döring, Jil S. V. Rüter, Gregor T. Dahl, Tobias Krekeler, Andreas Kornowski, Martin Ritter, Horst Weller and Tobias Vossmeyer |
| Format: | E-Book-Kapitel |
| Sprache: | Englisch |
| veröffentlicht: |
2019
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| Gesamtaufnahme: |
Royal Society of Chemistry: RSC Advances, 9(2019), 46, Seite 26902-26914
, volume:9 |
| Quelle: | Verbunddaten SWB Lizenzfreie Online-Ressourcen |
| Zusammenfassung: | ZrO2@SiO2 core-shell submicron particles are promising candidates for the development of advanced optical materials. Here, submicron zirconia particles were synthesized using a modified sol-gel method and pre-calcined at 400 °C. Silica shells were grown on these particles (average size: ∼270 nm) with well-defined thicknesses (26 to 61 nm) using a seeded-growth Stöber approach. To study the thermal stability of bare ZrO2 cores and ZrO2@SiO2 core-shell particles they were calcined at 450 to 1200 °C. After heat treatments, the particles were characterized by SEM, TEM, STEM, cross-sectional EDX mapping, and XRD. The non-encapsulated, bare ZrO2 particles predominantly transitioned to the tetragonal phase after pre-calcination at 400 °C. Increasing the temperature to 600 °C transformed them to monoclinic. Finally, grain coarsening destroyed the spheroidal particle shape after heating to 800 °C. In striking contrast, SiO2-encapsulation significantly inhibited grain growth and the t → m transition progressed considerably only after heating to 1000 °C, whereupon the particle shape, with a smooth silica shell, remained stable. Particle disintegration was observed after heating to 1200 °C. Thus, ZrO2@SiO2 core-shell particles are suited for high-temperature applications up to ∼1000 °C. Different mechanisms are considered to explain the markedly enhanced stability of ZrO2@SiO2 core-shell particles. |
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| Beschreibung: |
Sonstige Körperschaft: Technische Universität Hamburg Sonstige Körperschaft: Technische Universität Hamburg, Betriebseinheit Elektronenmikroskopie BEEM Sonstige Körperschaft: Technische Universität Hamburg, SFB 986 Maßgeschneiderte Multiskalige Materialsysteme M3 |
| Umfang: | Illustrationen, Diagramme |
| ISSN: |
2046-2069
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| DOI: | 10.15480/882.2424 |