Non-monotonic variation of flow strength in nanochannels grafted with end-charged polyelectrolyte layers

doi:10.1039/d1ra06601c

IMECH-IR > 非线性力学国家重点实验室

	Non-monotonic variation of flow strength in nanochannels grafted with end-charged polyelectrolyte layers
	Wu,Peng; Sun,Tao; Jiang XK(蒋玺恺)
通讯作者	Wu, Peng(wupeng@imut.edu.cn)
发表期刊	RSC ADVANCES
	2022-01-28
卷号	12 期号:7 页码:4061-4071
摘要	The electrokinetic transport of fluids, also called the electroosmotic flow (EOF), in micro/nanoscale devices occurs in promising applications such as electrokinetic energy conversion (EKEC) systems. Recently, EKEC systems grafted with end-charged polyelectrolyte (PE) layers (PELs) have been reported to exhibit higher efficiencies than those of intrinsic systems. Understanding the interplay between the end-charged PELs and electrical double layers (EDLs) on the EOF is crucial for designing highly efficient EKEC systems. The interplay between the end-charged PELs and EDLs on the strength of the EOF (V-0) is studied by explicitly modeling the EOF through nanochannels grafted with end-charged PELs using atomic simulations. The variation of V-0 is examined for nanochannels grafted with PELs at various separations (d = 3.5-0.4 nm) to cover various conformations of PEs, inlcuding mushroom, semi-dilute brushes, and concentrated brushes. We find that V-0 follows a non-monotonic variation as d decreases and this is correlated with the conformation of the PEs. Specifically, as d decreases, V-0 decreases first in the mushroom regime (d = 3.5-2.0 nm), and then V-0 increases in the concentrated brush regime (d = 0.75-0.4 nm). Navigated by the continuum Navier-Stokes-Brinkman model, the above observations are rationalized by the competition between the driving effect from the spatial shift of ions in EDLs and the drag effect from PELs. The insights obtained in this work are important to guide the design of highly efficient EKEC systems by grafting end-charged PELs onto channel surfaces.
DOI	10.1039/d1ra06601c
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000750384600001
关键词[WOS]	ELECTROKINETIC ENERGY-CONVERSION ; ELECTROOSMOTIC FLOW ; IONIC CURRENT ; CURRENT RECTIFICATION ; BIOMIMETIC NANOPORES ; TRANSPORT ; MODULATION ; SIMULATION ; ELECTROPHORESIS ; BRUSHES
WOS研究方向	Chemistry
WOS类目	Chemistry, Multidisciplinary
资助项目	Natural Science Foundation of Hubei Province of China[0216120087]
项目资助者	Natural Science Foundation of Hubei Province of China
论文分区	二类
力学所作者排名	3
RpAuthor	Wu, Peng
引用统计
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/88454
专题	非线性力学国家重点实验室
推荐引用方式 GB/T 7714	Wu,Peng,Sun,Tao,Jiang XK. Non-monotonic variation of flow strength in nanochannels grafted with end-charged polyelectrolyte layers[J]. RSC ADVANCES,2022,12,7,:4061-4071.
APA	Wu,Peng,Sun,Tao,&蒋玺恺.(2022).Non-monotonic variation of flow strength in nanochannels grafted with end-charged polyelectrolyte layers.RSC ADVANCES,12(7),4061-4071.
MLA	Wu,Peng,et al."Non-monotonic variation of flow strength in nanochannels grafted with end-charged polyelectrolyte layers".RSC ADVANCES 12.7(2022):4061-4071.

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