Manipulation of gold coated microspheres using electrorotation  

作　　者：JIANG HongYuan REN YuKun HAN XiaoJun TAO Ye LI ShanShan 

机构地区：[1]School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, China [2]School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin 150001, China [3]State Key Lab of Fluid Power Transmission and Control ZheJiang University, Hangzhou 310027, China

出　　处：《Science China(Technological Sciences)》2011年第3期643-649,共7页中国科学（技术科学英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant No. 51075087);the State Key Lab of Fluid Power Transmission and Control of ZheJiang University (Grant No. GZKF-201004);the China Scholarship Council (Grant No. 2009612129);Program for New Century Excellent Talents in University (Grant No. NCET-09-0054)

摘　　要：The electrorotation of microspheres coated with conductive surface is a novel and important technology for label-free biosensors. Using the electroless plating approach, the polystyrene microspheres with 15 μm and 25 μm in diameters were coated with 50 nm gold layer in thickness. The electrorotation experiments on those gold coated polystyrene microspheres (GCPMs) were carried out. The results showed that they rotated in the opposite direction of the electric field in a low frequency range (100-100 kHz), and the maximum rotation speed was higher than that of uncoated microspheres. Based on the theory of traveling wave electroosmosis(TWEO) and induced charge electroosmosis (ICEO), the electrorotation of GCPMs was quantitively analyzed and confirmed by observing the fluid flow around GCPM. The equations describing the electroration speed of GCPMs were proposed, which are consistent with the experiment results.

关 键 词：ELECTROROTATION gold coated microspheres TWEO ICEO 

分 类 号：TQ153.18[化学工程—电化学工业] TP242[自动化与计算机技术—检测技术与自动化装置]