Properties of gravity-free arc discharge and its application to production of high-quality carbon annotates

无重力电弧放电特性及其在高质量碳注释生产中的应用

基本信息

批准号：
15540471
负责人：
MIENO Tetsu
金额：
$ 2.3万
依托单位：
Shizuoka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15540471/
关键词：
arc discharge gravity-free carbon nanotube process control atomic and molecular process heat convection super-sonic wave carbon cluster ガスアーク放電原子分子素過程

项目摘要

1)Experiment by a 12-m-high vertical-swing-tower Under the gravity-free condition, the emission intensity from the arc is enhanced, the volume of the arc is increased and the arc spot on the electrodes is stabilized.2)Fluid simulation Time evolution of the temperature contour and expansion velocity vectors of the gas was calculated under the experimental condition. Under the gravity-free condition, the hot gas region expands slowly and monotonically. As the temperature gradient is low, the reaction time is increased. Under the normal gravity condition, the steady-state heat convection (with speed of about 1 m/s) is immediately established within 1 s. These calculation results are in good agreement with the experimental results.3)Production of nanotubes under the gravity-free condition Under the gravity-free condition, (a)production rate of the soot increases, (b)content of single-walled carbon nanotubes in the soot is about twice, and the thickness of the nanotube-bundles increases, (c)the length is estimated to be 10-100 micro meter, (d)the nanotubes become fatter.4)Purification By the oxygen plasma the nanotube sample is purified. By using the spark-gap method, conductive carbon particles are removed.5)Physical properties The nanotube pellet is produced, and its hardness is strong.6)Presentation in an exhibition The results were presented in the exhibition (Innovation Japan 2005, Sep. 2005) held in Tokyo.

1）在无重力条件下，通过12毫米的垂直旋转式较高的脚，增强了来自电弧的发射强度，弧的体积增加，电极上的ARC斑点稳定下来。2）在实验条件下计算了气体轮廓和膨胀速度向量的流体模拟时间演变。在无重力条件下，热气体区域的膨胀缓慢而单调。由于温度梯度很低，反应时间会增加。在正常的重力条件下，稳态热对流（速度约为1 m/s）立即在1 s内建立。这些计算结果与实验结果非常吻合。3）在无重力条件下无重力条件下的纳米管的产生，（a）烟灰的产量增加，（b）单壁碳纳米管的含量在烟灰中大约两次，纳米管束的厚度增加，（c）估计长度为10-100微米，（d）纳米管变粘。4）氧气等离子体纯化纳米管样品。被纯化。 5）物理特性产生了纳米管颗粒，其硬度很强。6）在展览中表现出来。结果在展览中呈现（Innovation Japan 2005，9月。 2005）在东京举行。