A microscopic physical description of electrothermal-induced flow for control of ion current transport in microfluidics interfacing nanofluidics

doi:10.1002/elps.201900105

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	A microscopic physical description of electrothermal-induced flow for control of ion current transport in microfluidics interfacing nanofluidics
	Liu WY 1; Ren YK(任玉坤)2,3; Chen F 1; Song JN 1; Tao Y 2; Du K 1; Wu QS 1
通讯作者	Ren, Yukun(rykhit@hit.edu.cn) ; Chen, Feng(chenfeng@chd.edu.cn)
发表期刊	ELECTROPHORESIS
	2019-10-01
卷号	40 期号:20 页码:2683-2698
ISSN	0173-0835
摘要	The phenomenon of electrothermal (ET) convection has recently captured great attention for transporting fluidic samples in microchannels embedding simple electrode structures. In the classical model of ET-induced flow, a conductivity gradient of buffer medium is supposed to arise from temperature-dependent electrophoretic mobility of ionic species under uniform salt concentrations, so it may not work well in the presence of evident concentration perturbation within the background electrolyte. To solve this problem, we develop herein a microscopic physical description of ET streaming by fully coupling a set of Poisson-Nernst-Planck-Navier-Stokes equations and temperature-dependent fluid physicochemical properties. A comparative study on a standard electrokinetic micropump exploiting asymmetric electrode arrays indicates that, our microscopic model always predicts a lower ET pump flow rate than the classical macroscopic model even with trivial temperature elevation in the liquid. Considering a continuity of total current density in liquids of inhomogeneous polarizability, a moderate degree of fluctuation in ion concentrations on top of the electrode array is enough to exert a significant influence on the induction of free ionic charges, rendering the enhanced numerical treatment much closer to realistic experimental measurement. Then, by placing a pair of thin-film resistive heaters on the bottom of an anodic channel interfacing a cation-exchange medium, we further provide a vivid demonstration of the enhanced model's feasibility in accurately resolving the combined Coulomb force due to the coexistence of an extended space charge layer and smeared interfacial polarizations in an externally-imposed temperature gradient, while this is impossible with conventional linear approximation. This leads to a reliable method to achieve a flexible regulation on spatial-temporal evolution of ion-depletion layer by electroconvective mixing. These results provide useful insights into ET-based flexible control of micro/nanoscale solid entities in modern micro-total-analytical systems.
关键词	Electrothermal convection Ion transport control Micro nanofluidics Salt concentration perturbation Smeared interfacial polarization
DOI	10.1002/elps.201900105
收录类别	SCI
语种	英语
WOS记录号	WOS:000490455400008
关键词[WOS]	ELECTROKINETICS ; FLUIDS ; ELECTROLYTES ; PARTICLES ; DYNAMICS ; DRIVEN
WOS研究方向	Biochemistry & Molecular Biology ; Chemistry
WOS类目	Biochemical Research Methods ; Chemistry, Analytical
论文分区	二类
力学所作者排名	1
RpAuthor	Ren, Yukun ; Chen, Feng
引用统计	被引频次：25[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/80664
专题	非线性力学国家重点实验室
作者单位	1.Changan Univ, Sch Elect & Control Engn, Sch Highway, Xian, Shaanxi, Peoples R China; 2.Harbin Inst Technol, State Key Lab Robot & Syst, West Da Zhi St 92, Harbin, Heilongjiang, Peoples R China; 3.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech LNM, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Liu WY,Ren YK,Chen F,et al. A microscopic physical description of electrothermal-induced flow for control of ion current transport in microfluidics interfacing nanofluidics[J]. ELECTROPHORESIS,2019,40,20,:2683-2698.
APA	Liu WY.,任玉坤.,Chen F.,Song JN.,Tao Y.,...&Wu QS.(2019).A microscopic physical description of electrothermal-induced flow for control of ion current transport in microfluidics interfacing nanofluidics.ELECTROPHORESIS,40(20),2683-2698.
MLA	Liu WY,et al."A microscopic physical description of electrothermal-induced flow for control of ion current transport in microfluidics interfacing nanofluidics".ELECTROPHORESIS 40.20(2019):2683-2698.

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