• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Nanotechnology >Formation of nanoparticles in flames; measurement by particle mass spectrometry and numerical simulation
【24h】

Formation of nanoparticles in flames; measurement by particle mass spectrometry and numerical simulation

机译：在火焰中形成纳米颗粒;粒子质谱法测量和数值模拟

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

The size distributions of nanoparticles in flames are measured using a novel particle mass spectrometer (PMS), which is developed for the size range between 0.3 and 50 nm and for number concentrations between 10~9 and 10~(13). Using this instrument the particles are sampled without prior dilution from the flame into a molecular beam. The charged nanoparticles are then deflected by an electric field, to determine the mass according to the 4ime-of~flight principle. The PMS is installed in a low pressure combustion chamber operated at 30 mbar. Measurements are made on primary soot particles and iron oxide particles in a laminar, premixed acetylene/oxygen flame. The soot particles increase in size as a function of the height above the burner and the C/O ratio from 2 up to 10 nm. Iron oxide particles of 3-5 nm are detected as a function of burner height. The soot particles form more rapidly than the iron oxide particles. A model calculation for the formation of silica and iron oxide in hydrogen/oxygen flames is developed, based on previously published reaction mechanisms. On adding a mono-disperse particle coagulation scheme, the time history of the particle number concentration and the particle size is calculated. In agreement with experimental data, the calculations show that iron oxide particles are formed more slowly than silica particles.
机译：使用新型粒子质谱仪（PMS）测量火焰中纳米粒子的尺寸分布，该仪器针对0.3至50 nm的尺寸范围和10〜9至10〜（13）的浓度范围开发。使用该仪器可以对颗粒进行采样，而无需事先将其从火焰中稀释成分子束。然后将带电的纳米粒子通过电场偏转，以根据飞行时间的4ime原理确定质量。 PMS安装在30 mbar的低压燃烧室中。在层状预混合乙炔/氧气火焰中对一次烟灰颗粒和氧化铁颗粒进行测量。烟尘颗粒的尺寸随燃烧器上方高度和C / O比从2到10 nm的增加而增加。检测到3-5 nm的氧化铁颗粒是燃烧器高度的函数。烟灰颗粒比氧化铁颗粒形成得更快。基于先前公布的反应机理，开发了用于在氢/氧火焰中形成二氧化硅和氧化铁的模型计算。添加单分散颗粒混凝方案后，可计算出颗粒数浓度和粒径的时间历程。与实验数据一致，计算表明氧化铁颗粒的形成比二氧化硅颗粒的形成更慢。

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