Modeling Nanodusty Plasmas

CBET-0756315 Girshick纳米尘埃等离子体是含有纳米颗粒的气体等离子体。目前还没有一个完整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化。如果能够开发这样的模型，它将加深对所涉及的耦合现象的基本理解，并作为一种设计工具。作为一种工具，该模型可以指导等离子体过程的发展，这些过程合成用于各种纳米技术应用的纳米颗粒，或者试图避免污染物纳米颗粒的形成和/或沉积。为了开发这个模型，将进行模拟来预测操作参数对等离子体-纳米颗粒系统行为的影响。模型结果将与法国奥尔良大学同时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洞察。该模型将专注于低压Ar-Silane等离子体。模拟将描述该系统中凝聚的性质，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性质的影响，如电子和离子密度分布，以及电子温度。通过模拟不同的外加电压、电极间隙、总压、气体温度和温度梯度以及气体和硅烷流量，研究操作参数的影响。教育和推广将在几个层面上整合到拟议的研究中。受资助的研究生将从与Orléans团队的国际互动以及与明尼苏达州纳米科学和工程研究人员的多学科团队的本地互动中受益匪浅。首席调查员还将参加明尼苏达州韦扎塔公立学校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.