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

doi:10.1039/d1ra06601c

CORC > 力学研究所 > 中国科学院力学研究所 > 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 2,3; Sun, Tao 2; Jiang, Xikai 1
刊名	RSC ADVANCES
	2022-01-28
卷号	12 期号:7 页码:4061-4071
DOI	10.1039/d1ra06601c
通讯作者	Wu, Peng(wupeng@imut.edu.cn)
英文摘要	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.
资助项目	Natural Science Foundation of Hubei Province of China[0216120087]
WOS关键词	ELECTROKINETIC ENERGY-CONVERSION ; ELECTROOSMOTIC FLOW ; IONIC CURRENT ; CURRENT RECTIFICATION ; BIOMIMETIC NANOPORES ; TRANSPORT ; MODULATION ; SIMULATION ; ELECTROPHORESIS ; BRUSHES
WOS研究方向	Chemistry
语种	英语
WOS记录号	WOS:000750384600001
资助机构	Natural Science Foundation of Hubei Province of China
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/88453]
专题	力学研究所_非线性力学国家重点实验室
通讯作者	Wu, Peng
作者单位	1.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China 2.Huazhong Univ Sci & Technol, ChinaEU Inst Clean & Renewable Energy, Wuhan 430074, Hubei, Peoples R China 3.Inner Mongolia Univ Technol, Coll Energy & Power Engn, Hohhot 010051, Inner Mongolia, Peoples R China
推荐引用方式 GB/T 7714	Wu, Peng,Sun, Tao,Jiang, Xikai. 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,&Jiang, Xikai.(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.