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

abstractcts - 0118204 t。马萨诸塞州阿默斯顿大学的R. Blake和K. jakus指出，颗粒制造的主要需求是将细颗粒分离成一个狭窄的尺寸分布。这在纳米级颗粒的制造中尤为重要，因为纳米级颗粒的分离变得非常困难和低效。当颗粒非常小时，常规的气-颗粒分离技术将不起作用，因为颗粒惯性与阻力的比例很小。在这个项目中提出的想法是增加这个比率，从而通过降低分离室的压力到接近真空来显着提高细颗粒分离的效率。随着压力的减小，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偏差较大。这将允许在撞击分离器中更有效地分离颗粒。提出的项目是通过实验和过程的计算建模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，将对细颗粒制造业产生相当大的好处。该项目包含强大的教育和研究整合部分，广泛的外展和社区服务。首席研究员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.