物理化学学报 >> 1997, Vol. 13 >> Issue (07): 580-585.doi: 10.3866/PKU.WHXB19970702

研究论文 上一篇    下一篇

制备参数影响ZrO2气凝胶结构特性的机理

王远洋,吴东,樊彦贞,孙予罕,陈诵英   

  1. 中国科学院山西煤炭化学研究所煤转化国家重点实验室,太原 030001
  • 收稿日期:1996-11-05 修回日期:1997-01-06 发布日期:1997-07-15
  • 通讯作者: 孙予罕

Mechanistic Study on the Effects of Preparation Parameters on the Structure Property of ZrO2 Aerogels

Wang Yuan-Yang,Wu Dong,Fan Yan-Zhen,Sun Yu-Han,Chen Song-Ying   

  1. State Key Laboratory of Coal Conversion,Institute of Coal Chemistry,Academia Sinica,Taiyuan 030001
  • Received:1996-11-05 Revised:1997-01-06 Published:1997-07-15
  • Contact: Sun Yu-Han

摘要:

探讨了胶凝顺序、老化介质和氨水浓度影响样品结构的内在机理.结果表明,ZrO2样品形貌的不同是由于或胶凝顺序不同而引起的水解和缩聚的进程不同,或老化介质不同而引起的老化机理不同所致.氨水浓度的影响一方面与粒子活动体积有关,一方面与氨水中的水抑制缩聚有关,且经过老化后使其影响更加明显.

关键词: ZrO2气凝胶, 制备参数, 成胶机理, 胶体-超临界干燥法

Abstract:

The mechanism for the effects of titration order, ageing medium and ammonia concentration on the properties of ZrO2 aerogels has been well discussed in the present paper. Different morphologies of ZrO2 aerogels obtained are due to different process of hydrolysis and condensation in different titration order, or to the ageing mechanism in different ageing medium; the effect of ammonia concentration on ZrO2 texture has been related to the free volume of particles and the inhibition to condensation reaction, and ageing process enhances this effect remarkbly.

Key words: ZrO2 aerogels, Preparation parameters, Gelation mechanism, Sol-gel route involving supercritical drying