Collection and Classification of Ultra-fine and Nano-scale Powders

摘要CTS-0118204 T。R.布莱克和K。马萨诸塞州阿默斯特的Jakus大学颗粒制造的主要需求之一是将细颗粒分离成窄的尺寸分布。 这在纳米级颗粒的制造中特别重要，其中分离变得非常困难和低效。 常规的气粒分离技术在颗粒很小时将不起作用，因为颗粒惯性与阻力的比值很小。 该项目提出的想法是增加该比率，并因此通过将分离室中的压力降低至接近真空来显著提高细颗粒分离的效率。 随着压力降低，颗粒上的阻力相对于颗粒惯性减小，导致颗粒轨迹与空气流线的较大偏差。 这将允许在冲击分离器中更有效地分离颗粒。 该项目是通过实验和计算建模的过程来证明这一想法的有效性。 所提出的想法是创新的，如果成功的话，将对细颗粒制造业产生相当大的好处。 该项目包含一个强有力的教育和研究一体化组成部分，具有广泛的外联和社区服务。 主要研究者在这方面也有相当多的知识和经验。

AbstractCTS-0118204T. R. Blake and K. JakusUniversity of Massachusetts AmherstOne of the major needs in particle manufacturing is the separation of fine particles into a narrow size distribution. This is particularly important in manufacturing of nanoscale particles where separation becomes very difficult and inefficient. Regular gas-particle separation techniques will not work when the particles are very small because of the small ratio of particle inertia to drag. The idea proposed in this project is to increase this ratio and, therefore, significantly increase the efficiency of the fine particle separation by decreasing the pressure in the separation chamber to near vacuum. As pressure decreases, the drag on the particle decreases relative to the particle inertia resulting in larger deviation of particle trajectory with the air streamline. This will allow more efficient separation of the particles in an impact separator. The proposed project is to demonstrate the effectiveness of the idea by experiments and computational modeling of the process. The proposed idea is innovative with considerable benefits to fine particle manufacturing industry, if successful. The project contains a strong education and research integration component with extensive outreach and community service. The Principal Investigators have considerable knowledge and experience in this area, as well.