Electrostatic Manipulation of Particles

对粒子的电磁操纵进行了研究。(1)三维离散元法用于阐明粒子的动力学。为了减少计算时间，在Cundall模型的基础上建立了典型的软球模型，并建立了硬球模型。(2)对静电场中粒子的输运进行了数值和实验研究。该技术已应用于直线输运、曲线输运、管内输运以及利用静电与重力平衡进行粒度的静电分离。(3)由于单粒子的操纵在电子学和生物学领域具有重要意义，因此开发了一种单粒子静电操纵系统。不仅可以操纵绝缘粒子，而且可以操纵导电粒子。利用离子风，开发了不均匀和同轴电极系统，以释放附着的粒子，而不依赖于探针的位置。(4)这些技术将应用于电子照相机的研制、月球探测除尘系统的研制、月球尘埃的操纵、组织工程用凝胶珠的三维图案形成等方面。

An investigation was conducted on the electromagnetic manipulation of particles.(1) Three-dimensional Distinct Element Method has been developed to clarify dynamics of particles. Not only the typical soft sphere model based on the Cundall model but also a hard-sphere model was established to reduce calculation time.(2) Numerical and experimental investigations have been carried out on the transport of particles in an electrostatic traveling field. This technology has been applied for linear transport, curved transport, transport in tube, and electrostatic separation of particle size utilizing the balance of the electrostatic and gravitational force.(3) Because the manipulation of single particle is of great importance in the areas of electronics and biology, an electrostatic manipulation system of single particle has been developed. It was possible to manipulate not only insulative but also conductive particles. Uneven and coaxial electrode systems were developed to release the attached particle independently of the position of the probe by utilizing ionic wind.(4) These technologies will be applied for the development of electrophotography machine, dust cleaner system for the lunar exploration, manipulation of lunar dust, and three-dimensional pattern formation of gel-beads for tissue engineering.