导体微纳米粒子具有优异的电学性能，其精确操纵对实现众多微流控系统的核心功能至关重要,介电泳则是对其精确操纵的一种有效手段。然而，导体粒子的介电泳行为特征不能用传统Maxwell-Wagner界面极化理论评价，成为其应用过程中的瓶颈。为此，本项目拟针对介电泳操纵导体微纳米粒子的基础科学问题展开研究。首先，探究交流电场作用下导体粒子与溶液界面区双电层的极化规律，求解PNP方程，综合考虑诱导电荷电渗及壁面摩擦等参数影响，明确交流电场与导体微纳米粒子的相互作用关系，揭示导体粒子特殊介电泳行为特征的产生机理；其次，开展多种导体微纳米粒子的介电泳相关实验及诱导电荷电渗等实验研究，验证理论研究的合理性，进而对理论研究结果进行修正和完善；最后，利用导体微纳米粒子的特殊介电泳行为特征，实现微流控研究中的一些重要功能。本项目旨在揭示介电泳操纵导体微纳米粒子的内部机理，为其在微流控中的广泛应用奠定理论基础。

Conductive micro-and nano-particles are excellent conductors, and their precise manipulation is crucial for achieving the core function of the microfluidics. Dielectrophores is an effective means for the accurate control of the micro-and nano-particles. However, the dielectrophoretic behaviour of the conductive particles can not be explained by the traditional theory of the Maxwell-Wagner interface polarisation, which is a bottleneck problem for the application of dielectrophoresis. Therefore, this project will focus on the basic mechanism of the manipulation of the conductive particles by dielectrophoresis. Firstly, mechanism for the polarisation of the double layer at the interface of the conductive particles and electrolytes will be analyzed, and then the PNP equation will be solved. Moreover, the interaction between the AC electric fields and the conductive particles will be demonstrated by considering both the induced-charge electroosmosis and wall friction.The mechanism of the novel dielectrophoretic behaviour will be carried out; Secondly, dielectrophoresis and induced-charge electrosomosis experiments for many kinds of conductive particles will be carrided out in order to verify the accuracy of the theory, and then correct and complete the theoretical work; Finally, some important functions will be achieved by utilizing the novel dielectrophoresis. This project will show the internal mechanism for the manipulation of the conductive micro-and nano-particles by dielectrophoresis, which lays the foundation for the extensive applications of conductive micro-and nano-particles.