Electrical Charging of Nanoparticles by Ions and Free Electrons

摘要提案题目：离子和自由电子对纳米粒子的电荷作用提案号：cts -9912538项目负责人：David puiu机构：明尼苏达大学本项目的目的是通过实验和理论研究离子和自由电子对纳米粒子的电荷作用。纳米粒子的电荷目前只被部分理解，而这个项目的结果将对材料科学和健康科学产生直接的兴趣。在材料科学应用到半导体制造可以预见。在健康科学中，控制空气中的微粒可能有重大的好处。一项基础研究将用于研究跃迁和自由分子充电理论。该研究将提供有关离子和自由电子充电所能达到的最大充电效率的信息。改进了单带电和双带电粒子的非流行电荷分布，这将是一种比传统的电荷分数测量更灵敏的电荷理论测试。这种新型充电器在纳米粒子分类、材料科学和微电子等许多领域都有潜在的应用前景。将得到玻尔兹曼碰撞方程的数值解。由于在正常操作条件下，粒子大小和气体分子的平均自由程是相同的数量级，因此实验和理论都面临挑战。数值结果将与新充电器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.