Modeling Nanodusty Plasmas

纳米尘埃等离子体是含有纳米粒子的气体等离子体。目前还没有一个全面的纳米尘埃等离子体模型可以预测纳米粒子-等离子体系统在空间和时间上的演变。如果可以开发这样的模型，它将加深对所涉及的耦合现象的基本理解，并作为设计工具。作为一种工具，该模型可以指导为各种纳米技术应用合成纳米粒子的等离子体工艺的发展，或者寻求避免污染物纳米粒子的形成和/或沉积。为了建立这个模型，将进行模拟来预测操作参数对等离子体-纳米粒子系统行为的影响。模型的结果将与将同时在法国奥尔海姆斯大学进行的实验进行比较。预计这项工作将导致对纳米尘埃等离子体中发生的现象的基本见解。该模型将专注于低压氩硅等离子体。模拟将描述该系统中凝固的本质，不同粒子充电模型对系统的影响，以及纳米粒子演化对等离子体特性（如电子和离子密度分布以及电子温度）的影响。工作参数的影响将通过模拟来研究，假设施加电压、电极间隙、总压、气体温度和温度梯度、氩气和硅烷流量的不同值。教育和外联工作将在几个层次上纳入拟议的研究。受资助的研究生将大大受益于与orlsamans小组的国际互动，以及与明尼苏达纳米粒子科学和工程研究人员的多学科团队的本地互动。首席研究员还将参加明尼苏达州威扎塔公立学校的青年科学家圆桌会议。

CBET-0756315GirshickNanodusty plasmas are gas plasmas that contain nanoparticles. No comprehensive model of a nanodusty plasma presently exists that can predict the evolution of the nanoparticle-plasma system in both space and time. If such a model can be developed, it will both deepen fundamental understanding of the coupled phenomena involved and serve as a design tool. As a tool, the model could guide development of plasma processes that synthesize nanoparticles for a variety of nanotechnology applications or that seek to avoid formation and/or deposition of contaminant nanoparticles.To develop this model, simulations will be conducted to predict the effects of operating parameters on the behavior of the plasma-nanoparticle system. Model results will be compared to experiments that will be conducted concurrently at the University of Orléans, France. It is expected that this work will lead to fundamental insights into phenomena occurring in nanodusty plasmas.The model will focus on low-pressure argon-silane plasmas. Simulations will provide a description of the nature of coagulation in this system, of the effects on the system of different particle charging models, and of the effects of the nanoparticle evolution on plasma properties such as electron and ion density profiles, and electron temperature. The effects of operating parameters will be studied by conducting simulations that assume various values of applied voltage, electrode gap, total pressure, gas temperature and temperature gradient, and argon and silane flow rates.Education and outreach will be integrated into the proposed research at several levels. Funded graduate students will greatly benefit from the international interactions with the Orléans group as well as local interactions with Minnesota's multidisciplinary team of nanoparticle science and engineering researchers. The principal investigator will also participate in the Young Scientist Roundtable of the Wayzata, MN, public schools.