• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Advanced Powder Technology: The internation Journal of the Society of Powder Technology, Japan >Generation of uniform tetrapod-shaped zincoxide nanoparticles by gas-phase reaction with using flow restrictor
【24h】

Generation of uniform tetrapod-shaped zincoxide nanoparticles by gas-phase reaction with using flow restrictor

机译：限流器气相反应生成均匀的四足形氧化锌纳米粒子

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Tetrapod-shaped ZnO particles are generated via gas-phase reaction of Zn vapor and oxygen in air, where they undergo homogeneous nucleation from supersaturated ZnO vapor and successive growth by surface reaction. It was found that a simple device for flow restrictor is effective in making ZnO particles of terapod-shape by leaving sufficient amounts of unreacted Zn vapor with the embryos of ZnO. In the absence of the flow restrictor, only spherical particles are formed because the oxidation reaction takes place immediately after mixing and unreacted Zn vapor does not remain for the subsequent crystal growth. The Zn vapor concentration distribution, oxygen concentration distribution, temperature, gas velocity and reaction rate in the reactor were analyzed by using a conventional computational fluid dynamic simulation package. The simulation revealed that the flow restrictor does not enhance mixing between Zn vapor and air but suppresses the mixing and reduces the residence time in the reactor so that sufficient amounts of unreacted Zn vapor remain downstream of the flow restrictor, allowing ZnO particles to grow in tetrapod-shape by abnormal crystal growth.
机译：四脚架形状的ZnO颗粒是通过空气中Zn蒸气和氧气的气相反应生成的，在那里它们从过饱和ZnO蒸气中经历均相成核，并通过表面反应连续生长。已经发现，通过将足够量的未反应的Zn蒸气留在ZnO的胚中，用于限流器的简单装置可有效地制备呈萜形的ZnO颗粒。在没有限流器的情况下，仅形成球形颗粒，因为氧化反应在混合后立即发生，并且未反应的Zn蒸气不会保留用于随后的晶体生长。使用常规的计算流体动力学模拟软件包对反应器中的锌蒸气浓度分布，氧浓度分布，温度，气体速度和反应速率进行了分析。模拟显示限流器不会增强Zn蒸气与空气之间的混合，但会抑制混合并减少在反应器中的停留时间，从而在限流器的下游留有足够量的未反应的Zn蒸气，从而使ZnO颗粒在四脚架中生长异常晶体生长引起的晶体形状。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号