Exploring plasma mechanism of synthesis of the ultra-long single wall carbon nanotubes in arc discharge plasma

探索电弧放电等离子体合成超长单壁碳纳米管的等离子体机理

• 批准号: 0853777
• 负责人: Michael Keidar
• 金额: $ 10万
• 依托单位: George Washington University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-09-15 至 2012-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0853777&HistoricalAwards=false
• 关键词: Exploring; plasma; mechanism; synthesis; ultra

0853777KeidarThe goal of this research is to study the plasma mechanism for synthesizing ultra-long single-wall carbon nanotubes (SWNT) in an arc discharge. Their combination of stiffness and toughness makes SWNTs the strongest known fibers. Ultra-long SWNTs (lengths more than 10,000 times larger than their diameters) are expected to enable micro-electric motors and can act as useful nanoscale cables for conducting electricity or heat. Mass production and use will depend on understanding the science behind their synthesis.A possible manufacturing route has been inspired by the recent finding that length might be controlled by a magnetic field in arc-discharge synthesis. The present research studies plasma parameters and the resulting nanotube length distribution, aiming both to understand the effect of the magnetic field and to find the best conditions for synthesis of ultra-long nanotubes. The main distinguishing factor of this study is that the problem of the SWNT synthesis will be approached from the basic analysis of synthesis and rather than by trial and error. A state-of-the-art Langmuir probe technique will significantly expand the limited data on plasma parameters during atmospheric arc discharge. The arc discharge and the plasma interactions with carbon nanotubes will be modeled using previously developed fluid codes. This interdisciplinary project has both fundamental and technological significance. The fundamental significance is that understanding of the arc discharge and SWNT formation mechanism will be greatly expanded. The technological significance lies in exploring the possibility of controlling SWNT synthesis, enhancing SWNT yield, and ultimately paving the way for mass production and industrial utilization. Beyond the fundamental and technological significance, this work will serve as an excellent vehicle for undergraduate and graduate education in the field of nanotechnology and plasma science. To involve women and under-represented minorities, the PIs will work closely with student organizations at George Washington like the Society of Women Engineers. In addition, undergraduate students will be engaged in the research.

0853777Keidar这项研究的目的是研究在弧排放中合成超长单壁碳纳米管（SWNT）的血浆机制。它们的刚度和韧性的结合使SWNT成为最强的已知纤维。 超长的SWNT（长度超过直径的10,000倍）预计可以实现微电动机，并且可以充当有用的纳米级电缆，用于传导电或热量。 批量生产和使用将取决于理解其合成背后的科学。可能的制造路线的灵感来自最近的发现，即长度可能受电弧分离合成中的磁场控制。本研究研究等离子体参数和所得的纳米管长度分布，旨在了解磁场的效果，并找到合成超长纳米管的最佳条件。这项研究的主要区别因素是，SWNT合成的问题将从合成的基本分析和反复试验中解决。 最先进的Langmuir探针技术将显着扩大大气弧排出过程中血浆参数的有限数据。弧排放和与碳纳米管的血浆相互作用将使用先前开发的流体代码进行建模。这个跨学科项目具有基本和技术意义。基本意义在于，将大大扩展对弧排放和SWNT形成机制的理解。技术意义在于探索控制SWNT合成，提高SWNT产量的可能性，并最终为大众生产和工业利用铺平了道路。除了基本和技术意义之外，这项工作还将成为纳米技术和等离子体科学领域的本科和研究生教育的绝佳工具。为了使妇女和代表性不足的少数民族参与，PIS将与乔治·华盛顿的学生组织紧密合作，例如女性工程师协会。此外，本科生将参与研究。