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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

超临界流体干燥法制备纳米级TiO2的研究

张敬畅; 曹维良; 于定新; 石锦华; 窦正仓   

  1. 北京化工大学应用化学系; 北京 100029
  • 收稿日期:1998-04-06 修回日期:1998-06-12 出版日期:1999-02-20 网络出版日期:1999-02-20

Preparation of TiO2 Ultrafine Powder in Terms of SCFD Technique

ZHANG Jing-Chang; CAO Wei-Liang; YU Ding-Xin; SHI Jin-Hua; DOU Zheng-Chang   

  1. Department of APPlied Chemistry; Beijing Universitg of Chemical Technology Beijin 100029 China）
  • Received:1998-04-06 Revised:1998-06-12 Published:1999-02-20 Online:1999-02-20

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摘要： 本文以廉价无机盐为原料，采用溶胶-凝胶法（Sol－Gel）结合超临界流体干燥（SupercriticalFluidDrying简称SCFD）制备了纳米级TiO2，并采用XRD、DTA－TG、TEM技术研究了Sol－Gel过程中溶液的pH值、浓度、陈化时间及SCFD技术等条件对TiO2粒径大小的影响，实现了干燥晶化一步完成．用该方法制得的TiO2超细粉体，粒径大都在3～6um之间，呈球形微粒，粉体晶型为锐钛矿型，并具有纯度高、热稳定性好、失重小和粒度分布均匀等特性．

关键词: 超临界流体干燥, 二氧化钛, 气凝胶, 纳米材料

Abstract: Titanium dioxide ultrafine powders were prepard by sol-gel and supercritical fluid drying(SCFD) methods from cheap inorganic salts as raw materials. The ultrafine powders were characterized in terms of XRD, DTA-TG and TEM techniques. The dependence of particle size onsolution PH value, concentration, ageing time and SCFD condition was also investigated. It wasfound that the ultrafine powders so obtained eXhibit small crystallite sizes of 3-6urn, better thermal stability and less weight loss.

Key words: supercritical fluid drying, nanometer material, TiO2, gasgel

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