添加环氧丙烷法常压干燥制备ZrO<sub>2</sub>气凝胶

引用本文: 郭兴忠, 颜立清, 杨辉, 李建, 李超宇, 蔡晓波. 添加环氧丙烷法常压干燥制备ZrO₂气凝胶[J]. 物理化学学报, 2011, 27(10): 2478-2484. doi: 10.3866/PKU.WHXB20110925 shu

Citation: GUO Xing-Zhong, YAN Li-Qing, YANG Hui, LI Jian, LI Chao-Yu, CAI Xiao-Bo. Synthesis of Zirconia Aerogels by Ambient Pressure Drying with Propylene Oxide Addition[J]. Acta Physico-Chimica Sinica, 2011, 27(10): 2478-2484. doi: 10.3866/PKU.WHXB20110925 shu

添加环氧丙烷法常压干燥制备ZrO₂气凝胶

基金项目:
浙江省重点创新团队项目(2009R50010)资助 (2009R50010)

摘要: 以无机锆盐硝酸氧锆(ZrO(NO₃)₂·5H₂O)为前驱体, 1,2-环氧丙烷(PO)为凝胶促进剂, 甲酰胺(FA)为干燥控制化学添加剂(DCCA), 采用溶胶-凝胶法并通过常压干燥制备了轻质二氧化锆(ZrO₂)气凝胶, 利用差热分析(DTA)、扫描电镜(SEM)、N₂吸附/脱附等测试技术对所制得的ZrO₂气凝胶进行了表征. 结果表明: 添加环氧丙烷常压干燥制得的ZrO₂气凝胶具有纳米尺寸的多孔网络结构, 表观密度可低至202.08 kg·m^-3, 比表面积可高达645.0 m²·g^-1, 与超临界干燥效果相当. 环氧丙烷因其环氧原子的强亲核性和不可逆的开环反应, 可促进凝胶化, 并通过环氧丙烷的量控制反应过程和凝胶状态.

关键词:

English

Synthesis of Zirconia Aerogels by Ambient Pressure Drying with Propylene Oxide Addition

1.
Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, P. R. China
Received Date: 25 May 2011
Available Online: 27 September 2011
Fund Project:
浙江省重点创新团队项目(2009R50010)资助

Abstract: ZrO₂ aerogels were successfully synthesized by the sol-gel process and ambient pressure drying using ZrO(NO₃)₂·5H₂O as a precursor, 1,2-propylene oxide (PO) as a gelation agent, and formamide (FA) as a drying control chemical additive (DCCA). The prepared zirconia aerogel samples were characterized using differential thermal analysis (DTA), scanning electron microscopy (SEM), and nitrogen adsorption/desorption analysis. The results showed that the zirconia aerogels prepared by the propylene oxide addition method had a nanoscale porous network structure, as well as supercritical dried ones, with a low bulk density (202.08 kg·m^-3) and a high surface area (645.0 m²·g^-1). Propylene oxide can induce gelation through its nucleophilic property and its irreversible ring-opening reaction, and thus the sol-gel process and the state of gel can be controlled.

Key words:

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

添加环氧丙烷法常压干燥制备ZrO₂气凝胶

English

Synthesis of Zirconia Aerogels by Ambient Pressure Drying with Propylene Oxide Addition

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

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Synthesis of Zirconia Aerogels by Ambient Pressure Drying with Propylene Oxide Addition

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

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CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

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