微通道中电渗流及微混合的离子浓度效应

杨大勇; 王阳

doi:10.3879/j.issn.1000-0887.2015.09.009

微通道中电渗流及微混合的离子浓度效应

doi: 10.3879/j.issn.1000-0887.2015.09.009

杨大勇,
王阳

南昌大学信息工程学院, 南昌 330031

基金项目: 国家自然科学基金（11302095）

详细信息

作者简介:
杨大勇（1978—），男，安徽人，副教授，博士（通讯作者. E-mail: dayongyang@ncu.edu.cn）;王阳（1988—），男，江西人，硕士生（E-mail: w573235417@qq.com）.

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出版历程
- 收稿日期: 2015-05-15
- 修回日期: 2015-07-12
- 刊出日期: 2015-09-15

Effects of Ion Concentration on Electroosmotic Flow and Micromixing in Microchannels

Information Engineering School of Nanchang University, Nanchang 330031, P.R.China

Funds: The National Natural Science Foundation of China(11302095)

摘要

摘要: 电渗流广泛应用于微流控芯片中的流体输运与混合.该文提出了一种离子浓度梯度对电渗流及微混合产生影响的变量模型，采用有限元分析方法对微通道中电渗流及微混合的离子浓度效应进行了数值模拟，分别讨论了zeta电势、介电常数等对微通道内流场和浓度场的影响规律，定量分析了微混合效率.结果表明，当zeta电势和介电常数随浓度变化时，微通道中流场分布不均匀，离子分布不对称.当溶液浓度趋近1 mol/L时，溶液基本无法进入微通道.微混合效率随溶液间浓度差的增大而减小，而且浓度差越大越能在较短距离内到达充分混合.
- 电渗流 /
- 离子浓度 /
- 介电常数 /
- zeta电势
Abstract: Electroosmotic flow is widely used to transport and mix fluids in microfluidic chips. A variable model for the ion concentration gradient effects on the electroosmotic flow and micromixing in microchannels was presented. The effects were investigated numerically with the finite element method. The impacts of the zeta potential and the dielectric constant on the flow field and concentration field were also analyzed. The micromixing efficiency in the microchannel was evaluated quantitatively. The results show that the flow field is inhomogeneous, and the distribution of the ion concentration will be asymmetric in the microchannel while the zeta potential and the dielectric constant vary with the ion concentration. When the concentration of the electrolyte solution is approximate to 1 mol/L, the solution essentially couldn't be driven into the microchannel. The micromixing efficiency decreases with the ion concentration difference between the electrolyte solutions, and the larger the difference is, the shorter the distance is needed to reach perfect mixing.
- electroosmotic flow /
- ion concentration /
- dielectric constant /
- zeta potential

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参考文献(19)

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微通道中电渗流及微混合的离子浓度效应

doi: 10.3879/j.issn.1000-0887.2015.09.009

作者简介:
杨大勇（1978—），男，安徽人，副教授，博士（通讯作者. E-mail: dayongyang@ncu.edu.cn）;王阳（1988—），男，江西人，硕士生（E-mail: w573235417@qq.com）.

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Effects of Ion Concentration on Electroosmotic Flow and Micromixing in Microchannels

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微通道中电渗流及微混合的离子浓度效应

doi: 10.3879/j.issn.1000-0887.2015.09.009

作者简介: 杨大勇（1978—），男，安徽人，副教授，博士（通讯作者. E-mail: dayongyang@ncu.edu.cn）;王阳（1988—），男，江西人，硕士生（E-mail: w573235417@qq.com）.

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出版历程

Effects of Ion Concentration on Electroosmotic Flow and Micromixing in Microchannels

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出版历程

目录

作者简介:
杨大勇（1978—），男，安徽人，副教授，博士（通讯作者. E-mail: dayongyang@ncu.edu.cn）;王阳（1988—），男，江西人，硕士生（E-mail: w573235417@qq.com）.