Electrokinetic transport of nanoparticles in functional group modified nanopores  

作　　者：Teng Zhou Xiaohan He Juncheng Zhao Liuyong Shi Liping Wen 

机构地区：[1]Mechanical and Electrical Engineering College,Hainan University,Haikou 570228,China [2]CAS Key Laboratory of Bio-inspired Materials and Interfacial Science,Technical Institute of Physics and Chemistry,Chinese Academy of Sciences,Beijing 100190,China

出　　处：《Chinese Chemical Letters》2023年第6期512-516,共5页中国化学快报（英文版）

基　　金：funded by National Natural Science Foundation of China(Nos.52075138 and 61964006);Hainan Provincial Natural Science Foundation(No.2019RC032);Hainan Province Science and Technology Special Fund(No.ZDYF2022SHFZ033)。

摘　　要：Nanopore detection is a hot issue in current research.One of the challenges is how to slow down the transport velocity of nanoparticles in nanopores.In this paper,we propose a functional group modified nanopore.That means a polyelectrolyte brush layer is grafted on the surface of the nanopore to change the surface charge properties.The existing studies generally set the charge density of the brush layer to a fixed value.On the contrary,in this paper,we consider an essential property of the brush layer:the volume charge density is adjustable with pH.Thus,the charge property of the brush layer will change with the local H+concentration.Based on this,we established a mathematical model to study the transport of nanoparticles in polyelectrolyte brush layer modified nanopores.We found that pH can effectively adjust the charge density and even the polarity of the brush layer.A larger pH can reduce the transport velocity of nanoparticles and improve the blockade degree of ion current.The grafting density does not change the polarity of the brush charge.The larger the grafting density,the greater the charge density of the brush layer,and the blockade degree of ion current is also more obvious.The polyelectrolyte brush layer modified nanopores in this paper can effectively reduce the nanoparticle transport velocity and retain the essential ion current characteristics,such as ion current blockade and enhancement.

关 键 词：NANOPORE Polyelectrolyte brush layer Protonation and deprotonation reactions VELOCITY Ion current 

分 类 号：TB383.1[一般工业技术—材料科学与工程]