Author:
Jiang Hong-Yuan ,Ren Yu-Kun ,Tao Ye ,
Abstract
Electrorotation is an effective technique to characterize the electrical properties of dispersed particles. For the low Reynolds number microsystem, the mechanism of the electrorotation of microparticles induced by torque was analyzed based on the Maxwell-Wagner polarization. Characteristic frequency corresponding to the peak value of the electrorotation speed was deduced and the effect of the relaxation time on the particles' electrorotation direction was analyzed by the simulation of the electrorotation speed induced by the torque. The mechanism of the electrorotation of the microparticles induced by electroosmotic slip was qualitative analyzed based on the double layer and the idea about the gold surface being favorable to the electrorotation was proposed. Experiments on the electrorotation of the polystyrene with the carboxy surface and gold modified surface were performed, respectively. The results show that, the direction of the electrorotation of polystyrene spheres with carboxy surface is opposite to the electric field and, the corresponding frequency is higher with the torque playing the leading role. On the other hand, direction of the rotation of polystyrene spheres with the gold surface is homodromous with the electric field and the corresponding frequency is lower with the electroosmotic slip playing the leading rose.
Publisher
Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences
Subject
General Physics and Astronomy
Reference30 articles.
1. Morgan H, Green N G 2002 AC Electrokinetics: colloids and nanoparticles (Baldock: Research Studies Press Ltd.) p67
2. Stone H, Stroock A, Ajdari A 2004 Annu. Rev. Fluid Mech. 36 381
3. Ren Y K, Yan H, Jiang H Y, Gu J Z, Ramos A 2009 Chin. Phys. B 18 4349
4. Hardt S, Schnfeld F 2007 Microfluidic Technologies for Miniaturized Analysis Systems (New York: Springer-Verlag.)
5. Ramos A, Morgan H, Green N G, Castellanos A 1998 J. Phys. D: Appl. Phys. 31 2338
Cited by
1 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献