Electrical Charging of Nanoparticles by Ions and Free Electrons

摘要提案标题：纳米粒子的离子和自由电荷 电子提案编号：CTS-9912538主要研究者：大卫皮机构：明尼苏达大学本项目的目标是实验和理论研究的离子和自由电子的纳米粒子的充电。 纳米粒子的充电目前仅被部分理解，该项目的结果将在材料科学和健康科学中立即引起兴趣。 在材料科学中，可以设想半导体制造的应用。 在健康科学中，控制空气中的颗粒物可能会带来重大益处。 一个基本的研究将进行调查的过渡和自由分子充电理论。 该研究将提供有关通过离子和自由电子充电可以实现的最大充电效率的信息。 改进了不受欢迎的单、双电荷粒子的电荷分布，这将是一个比传统的电荷分数测量更灵敏的带电理论测试。 这种新型充电器在纳米颗粒分类、材料科学和微电子学等领域具有潜在的应用价值。 将得到玻尔兹曼碰撞方程的数值解。 实验和理论上的挑战，因为颗粒大小和气体分子的平均自由程是相同的数量级，在正常的操作条件下。 数值计算结果将与新的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。

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.