摘要
交流电热效应对实现微流体的驱动和微流体中粒子的操控具有便捷高效等优势。采用对称、非对称平面电极、对称双面电极及螺旋叉指电极,利用有限元方法对其电场、温度场、流场和粒子浓度场进行了强耦合仿真计算,并分析了所施加电压和电导率对局部流速及温度梯度的影响。进而,比较了不同几何类型叉指电极在相同激励下对微流体的驱动能力。结果表明,在只改变电压或电导率的情况下,电压与局部流速及温度梯度的平方成正比,电导率与局部流速及温度梯度呈线性关系;在相同激励下,四种叉指电极的局部流速和温度梯度大小依次为非对称电极、对称电极、双面电极和螺旋电极。实现了对多种典型几何形式微电极的交流电热效应仿真分析,可为优化利用该效应及相关的生物传感器设计提供参考。
AC electrothermal effect has advances of convenience and effeciency on microfluidic driving and particle manipulation.Through adopting symmetric,asymmetric,double-sided and helical electrodes,the fields of electricity,temperature,flow,and particle concentration around the interdigital electrodes are simulated by using finite element method.The impact on fluid velocity and temperature gradient by voltage and conductivity is investigated.Furthermore,the driving ability for microfluid with different geometry types of interdigital electrodes is compared under the same stimulation.The results show that when only voltage or conductivity is changed,the voltage is proportional to the square of local flow velocity or temperature gradient,and the conductivity is linear to local flow velocity or temperature gradient.For the maximum local flow velocity and temperature gradient,the order from large to small of four electrodes goes:asymmetric,symmetric,double-sided and helical electrode.The simulation and analysis for different typical microelectrodes provide references for AC electrothermal effect optimization and corresponding biosensor design.
作者
尤方朔
赵文辞
黄陈炜
汪涛
张鉴
戚昊琛
YOU Fangshuo;ZHAO Wenci;HUAG Chenwei;WANG Tao;ZHANG Jian;QI Haochen(School of Microelectronics,Hefei University of Technology,Hefei Anhui 230009,China;School of Electrical and Electronic Engineering,Wenzhou University,Wenzhou Zhejiang 325035,China)
出处
《传感技术学报》
CAS
CSCD
北大核心
2023年第10期1531-1538,共8页
Chinese Journal of Sensors and Actuators
基金
国家自然科学基金项目(620740047)。
关键词
微电极
微流体
交流电热效应
粒子富集
仿真分析
microelectrode
microfluidics
AC electrothermal effect
particle enrichment
simulation and analysis
