以ZrOCl2·8H2O为锆源,以环氧丙烷(PO)为凝胶促进剂制备ZrO2凝胶,将ZrO2凝胶置于正硅酸乙酯乙醇溶液中老化,再结合高温超临界干燥工艺制备了SiO2改性ZrO2气凝胶.通过对比ZrO2气凝胶和SiO2改性ZrO2气凝胶高温结构转变讨论了SiO2改性对ZrO2气凝胶高温结构的影响.采用FT-IR、XRD、SEM和TEM等分析手段对样品进行高温结构表征.结果表明:采用正硅酸乙酯乙醇溶液老化ZrO2凝胶后,在ZrO2凝胶粒子表面形成了一层SiO2包裹层,这层SiO2包裹层显著抑制了ZrO2的扩散、成核和生长过程,高温稳定性得以显著提高.
参考文献
| [1] | Hrubesh LW. .Aerogel applications[J].Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites,1998(1):335-342. |
| [2] | A. Soleimani Dorcheh;M. H. Abbasi .Silica aerogel; synthesis, properties and characterization[J].Journal of Materials Processing Technology,2008(1-3):10-26. |
| [3] | Matthias Koebel;Arnaud Rigacci;Patrick Achard .Aerogel-based thermal superinsulation: an overview[J].Journal of Sol-Gel Science and Technology,2012(3):315-339. |
| [4] | Bedilo A F;Klabunde K J .Synthesis of high surface area zieconia aerogels using high temperature supercritical drying[J].Nanostructured Materials,1997,8(2):119-135. |
| [5] | Carsten Stocker;Alfons Baiker .Zirconia aerogels:effect of acid-to-alkoxide ratio,alcoholic solvent and supercritical drying on structural properties[J].JOURNAL OF NON-CRYSTALLINE SOLIDS,1998,223:165-178. |
| [6] | Miller JB.;Ko EI. .ACIDIC PROPERTIES OF SILICA-CONTAINING MIXED OXIDE AEROGELS - PREPARATION AND CHARACTERIZATION OF ZIRCONIA-SILICA AND COMPARISON TO TITANIA-SILICA[J].Journal of Catalysis,1996(1):58-68. |
| [7] | Zhi-Gang Wu;Yong-Xiang Zhao;Dian-Sheng Liu .The synthesis and characterization of mesoporous silica–zirconia aerogels[J].Microporous and Mesoporous Materials,2004(1/3):127-132. |
| [8] | Sirarat Kongwudthiti;Piyasan Praserthdam;Waraporn Tanakulrungsank .The influence of Si-O-Zr bonds on the crystal-growth inhibition of zirconia prepared by the glycothermal method[J].Journal of Materials Processing Technology,2003(1/3):186-189. |
| [9] | Beena Tyagi;Kalpesh B. Sidhpuria;Basha Shaik;Raksh Vir Jasra .Effect of Zr/Si molar ratio and sulfation on structural and catalytic properties of ZrO_2-SiO_2 mixed oxides[J].Journal of porous materials,2010(6):699-709. |
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