| Ion diffusion coefficient measurements in nanochannels at various concentrations |
| Wang JR(王俊荣) ; Zhang L; Xue JM; Hu GQ(胡国庆); Xue, JM (reprint author), Peking Univ, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R China.
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| 发表期刊 | BIOMICROFLUIDICS
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| 2014-03
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| 卷号 | 8期号:2页码:24118 |
| ISSN | 1932-1058
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| 摘要 | Diffusion is one of the most fundamental properties of ionic transport in solutions. Here, we present experimental studies and theoretical analysis on the ion diffusion in nanochannels. Based on Fick's second law, we develop a current monitoring method to measure ion diffusion coefficient of high solution concentrations in nanochannels. This method is further extended to the cases at medium and low concentrations. Through monitoring ionic current during diffusion, we obtain diffusion coefficients of potassium chloride solution at different concentrations in nanochannels. These diffusion coefficients within the confined space are close to theirs bulk values. It is also found that the apparent ion diffusion equilibrium in the present experiments is very slow at low concentration, which we attribute to the slow equilibrium of the nanochannel surface charge. Finally, we get a primary acknowledge of the equilibrium rate between the nanochannel surface charge and electrolyte solution. The results in this work have improved the understanding of nanoscale diffusion and nanochannel surface charge and may be useful in nanofluidic applications such as ion-selective transport, energy conversion, and nanopore biosensors. (C) 2014 AIP Publishing LLC. |
| 学科领域 | Biochemistry & Molecular Biology
; Biophysics
; Science & Technology - Other Topics
; Physics
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| URL | 查看原文
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| 收录类别 | SCI
; EI
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| 语种 | 英语
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| WOS记录号 | WOS:000336082100024
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| 项目资助者 | This work was partially supported by MOST (2011CB707604) and NSFC (11272321, 11102214). We also thank the Nanofabrication Facility at Suzhou Institute of Nano-tech and Nano-bionics (SINANO) of Chinese Academy of Science (CAS) for technical support in device fabrication.
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| 课题组名称 | LNM微纳米流体力学
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| 论文分区 | 一类
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| 引用统计 |
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| 文献类型 | 期刊论文
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| 条目标识符 | http://dspace.imech.ac.cn/handle/311007/48858
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| 专题 | 非线性力学国家重点实验室
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| 通讯作者 | Xue, JM (reprint author), Peking Univ, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R China. |
推荐引用方式
GB/T 7714 |
Wang JR,Zhang L,Xue JM,et al. Ion diffusion coefficient measurements in nanochannels at various concentrations[J]. BIOMICROFLUIDICS,2014,8,2,:24118.
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| APA |
王俊荣,Zhang L,Xue JM,胡国庆,&Xue, JM .(2014).Ion diffusion coefficient measurements in nanochannels at various concentrations.BIOMICROFLUIDICS,8(2),24118.
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| MLA |
王俊荣,et al."Ion diffusion coefficient measurements in nanochannels at various concentrations".BIOMICROFLUIDICS 8.2(2014):24118.
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