Influence of AC Electrothermal Flow on the Dielctrophoretic Behaviors of Micro-nano Particles

doi:10.3901/JME.2017.14.202

Abstract

Abstract: Taking the case of interdigital electrode array, finite element models of symmetric/asymmetric physical field and travelling wave field are established respectively to solve the distribution of electric field, flow field, temperature and dielectrophoretic forces. The influence of AC electrothermal flow and the convective mass transfer process on the dielctrophoretic behaviors of micro-nano particles are presented herein. It is shown that the convection and mass transfer are enhanced due to the vortex generated by symmetric/asymmetric interdigital electrode array. As a result, the particles far away from the electrodes are transported towards the strong dielectrophoretic regions, enlarging the effective regions of dielectrophoresis. There is no obvious vortex and convections in the travelling wave flow field, but the dissipation of dielectrophoretic force is much slower than symmetric/asymmetric array, making the particles being trapped efficiently. The particles suspended at certain height (60 times of electrode height) can be affected by dielectrophoretic forces, improving the manipulating and transporting abilities for micro-nano particles.

Key words: AC electrothermal, convection and mass transfer, dielectrophoresis, microfluidics

CLC Number:

TH39
O442

YAN Zizi, LI Shanshan, LI Minghao, ZHANG Minghang, LI Tiejun, DAI Shijie. Influence of AC Electrothermal Flow on the Dielctrophoretic Behaviors of Micro-nano Particles[J]. Journal of Mechanical Engineering, 2017, 53(14): 202-208.

References

[1] LIAN M,ISLAM N,WU J. AC electrothermal manipulation of conductive fluids and particles for lab-chip applications[J]. Iet Nanobiotechnology,2007,1(3):36-43.
[2] RAMOS A,MORGAN H,GREEN N G,et al. Ac electrokinetics:A review of forces in microelectrode structures[J]. Journal of Physics D:Applied Physics,1998,31(18):2338-2353.
[3] MARTINE-DUARTE R. Microfabrication technologies in dielectrophoresis applications-A review[J]. Electrophoresis,2012,33(21):3110-3132.
[4] CHAUREY V,ROJANI A,SU Y H,et al. Scaling down constriction-based (electrodeless) dielectrophoresis devices for trapping nanoscale bioparticles in physiological media of high-conductivity[J]. Electrophoresis,2013,34(7):1097-1104.
[5] CUI H,LI S,YUAN Q,et al. An AC electrokinetic impedance immunosensor for rapid detection of tuberculosis[J]. Analyst,2013,138(23):7188-7196.
[6] LI S,CUI H,YUAN Q,et al. AC electrokinetics-enhanced capacitive immunosensor for point-of-care serodiagnosis of infectious diseases[J]. Biosensors and Bioelectronics,2014,51:437-443.
[7] LI S,YUAN Q,MORSHED B I,et al. Dielectrophoretic responses of DNA and fluorophore in physiological solution by impedimetric characterization[J]. Biosensors and Bioelectronics,2013,41:649-655.
[8] LI S,REN Y,JIANG H. Convection and mass transfer enhanced rapid capacitive serum immunoassay[J]. RSC Advances,2014,4(18):9064-9071.
[9] 费飞,曲艳丽,李文荣,等. 基于介电泳的电极阵列电场仿真研究[J]. 计算机仿真,2008,25(2):314-318. FEI Fei,QU Yanli,LI Wenrong,et al. Simulation of electric field for dielectrophoretic electrode arrays[J]. Journal of Computer Simulation,2008,25(2):314-318.
[10] LIU W,REN Y,SHAO J,et al. A theoretical and numerical investigation of travelling wave induction microfluidic pumping in a temperature gradient[J]. Journal of Physics D:Applied Physics,2014,47(7):075501.
[11] LO Y,LIN Y,LEI U,et al. Measurement of the Clausius-Mossotti factor of generalized dielectrophoresis[J]. Applied Physics Letters,2014,104(8):083701.
[12] ZHAO Y,YI U C,CHO S K. Microparticle concentration and separation by traveling-wave dielectrophoresis (twDEP) for digital microfluidics[J]. Microelectromechanical Systems,Journal of,2007,16(6):1472-1481.
[13] SHIELDS IV C W,REYES C D,LÓPEZ G P. Microfluidic cell sorting:A review of the advances in the separation of cells from debulking to rare cell isolation[J]. Lab on a Chip,2015,15(5):1230-1249.
[14] SRIDHARAN S,ZHU J,HU G,et al. Joule heating effects on electroosmotic flow in insulator-based dielectrophoresis[J]. Electrophoresis,2011,32(17):2274-2281.
[15] ZHU J,SRIDHARAN S,HU G,et al. Joule heating effects on electrokinetic focusing and trapping of particles in constriction microchannels[J]. Journal of Micromechanics and Microengineering,2012,22(7):075011.
[16] LI S,REN Y,CUI H,et al. Alternating current electrokinetics enhanced in situ capacitive immunoassay[J]. Electrophoresis,2015,36(3):471-474.
[17] 李姗姗,任玉坤,刘晓竹,等. 交流电场增强的牛副结核快速血清免疫检测[J]. 中国科学技术科学,2014,44(2):219-228. LI Shanshan,REN Yukun,LIU Xiaozhu,et al. AC electric field enhanced rapid serum immunoassay for cow tuberculosis[J]. Scientia Sinica Techologica,2014,44(2):219-228.
[18] TAO Y,REN Y,YAN H,et al. Continuous separation of multiple size microparticles using alternating current dielectrophoresis in microfluidic device with acupuncture needle electrodes[J]. Chinese Journal of Mechanical Engineering,2016,29(2):325-331.