Recent advancement in induced-charge electrokinetic phenomena and their micro- and nano-fluidic applications

Huicheng Feng; Honglong Chang; Xin Zhong; Teck Neng Wong

doi:10.1016/j.cis.2020.102159

Recent advancement in induced-charge electrokinetic phenomena and their micro- and nano-fluidic applications

Adv Colloid Interface Sci. 2020 Jun:280:102159. doi: 10.1016/j.cis.2020.102159. Epub 2020 Apr 19.

Authors

Huicheng Feng¹, Honglong Chang², Xin Zhong³, Teck Neng Wong⁴

Affiliations

¹ Unmanned System Research Institute, Northwestern Polytechnical University, Xi'an 710072, China; MOE Key Laboratory of Micro and Nano Systems for Aerospace, Northwestern Polytechnical University, Xi'an 710072, China; Yangtze River Delta Research Institute of Northwestern Polytechnical University, Taicang 215400, China.
² MOE Key Laboratory of Micro and Nano Systems for Aerospace, Northwestern Polytechnical University, Xi'an 710072, China. Electronic address: changhl@nwpu.edu.cn.
³ State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China. Electronic address: zhongxin0521@xjtu.edu.cn.
⁴ School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.

PMID: 32344205
DOI: 10.1016/j.cis.2020.102159

Abstract

Induced-charge electrokinetics (ICEK) remains a hot topic due to its promising applications in micro- and nano-fluidics. Over the past decade, researchers have made a great advancement in both fundamental studies and application developments. They captured (I) a flow reversal in induced-charge electroosmosis (ICEO) and attributed it to the phase delay effect of ions, (II) a chaotic ICEO and attributed it to the concentration polarization in the bulk solution, (III) a non-quadratic correlation for ICEO of non-Newtonian fluids and attributed it to the power-law viscosity, (IV) an induced-charge electrophoretic (ICEP) rotation of Janus doublets, etc. Furthermore, various ICEK-based micro- and nano-fluidic devices have been developed, namely, micropumps, particle focusers, trappers, sorters, and nanopore ion diodes. The present article provides a comprehensive review on the recent advancement of ICEK. Firstly, the fundamental studies of ICEK are introduced; then the micro- and nano-fluidic applications based on ICEK are presented; lastly, promising future directions for both fundamental and applications are discussed. This review presents the basic framework of ICEK, and can facilitate the development of ICEK-based applications.

Keywords: Induced-charge electrokinetics; Microfluidics nanofluidics.

Publication types

Review