Electrical Charging of Nanoparticles by Ions and Free Electrons

建议标题：离子和自由电子对纳米粒子的带电建议编号：CTS-9912538主要研究人员：明尼苏达大学大卫研究所这个项目的目的是从实验和理论上研究离子和自由电子对纳米粒子的带电。纳米粒子的带电目前只有部分了解，该项目的结果将立即引起材料科学和健康科学的兴趣。在材料科学中，半导体制造的应用是可以预见的。在健康科学中，控制空气中的颗粒物可能会带来重大好处。将进行基础研究，以研究跃迁和自由分子电荷理论。这项研究将提供有关离子和自由电子充电可以达到的最大充电效率的信息。一种改进的不受欢迎的电荷分布，包括单电荷和双电荷粒子，这将是对电荷理论的一种比传统电荷分数测量更敏感的测试。这种新型充电器在许多领域都有潜在的应用，包括纳米颗粒的分类、材料科学和微电子。我们将得到玻耳兹曼碰撞方程的数值解。由于气体分子的颗粒大小和平均自由程在正常操作条件下具有相同的数量级，因此出现了实验和理论上的挑战。数值计算结果将与用新型充电器获得的实验结果进行验证。如果成功，这项工作将在材料合成、有机涂层、燃料电池催化和药物输送等领域具有潜在的应用前景。

AbstractProposal Title: Electrical Charging of Nanoparticles by Ions and Free ElectronsProposal Number: CTS-9912538Principal Investigator: David PuiInstitution: University of MinnesotaThe objective of this project is to experimentally and theoretically investigate the charging of nanoparticles by ions and free electrons. Electric charging of nanoparticles is presently only partially understood, and the results of this project would be of immediate interest in materials science and health science. In materials science applications to semiconductor manufacturing can be envisioned. In health science the control of airborne particulates could be of significant benefit. A fundamental study will be performed to investigate the transition and free-molecule charging theories. The study will provide information on the maximum charging efficiency that can be achieved by ion and free electron charging. An improved unpopular charge distributions involving singly and doubly charged particles, which will be a more sensitive test of charging theories than the traditional fraction-of-charge measurements. The new charger has potential applications in many fields including classification of nanoparticles, materials science, and microelectronics. Numerical solutions for the Boltzmann Collision Equation will be obtained. Experimental and theoretical challenges arise because the particle size and the mean free path of gas molecules are of the same order of magnitude under normal operating conditions. The numerical results will be validated with the experimental results obtained with the new charger. If successful, this work will have potential applications in areas such as materials synthesis, organic coatings, fuel-cell catalysis, and drug delivery.