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Measurements of the ion-depletion zone evolution in a micro/nano-channel
Yu Q(余群); Li ZH(李占华); Silber-Li, Z (reprint author), Chinese Acad Sci, State Key Lab Nonlinear Mech, Inst Mech, Beijing 100190, Peoples R China
Source PublicationMicrofluidics and Nanofluidics
2011
Volume11Issue:5Pages:623-631
ISSN1613-4982
AbstractIon-depletion and ion-enrichment are the most important phenomena found in a hybrid micro/nano-channel. This depletion process significantly decreases the ion concentration at the anodic end of the nano-channels and lower concentration propagation in the microchannel. The present paper focuses on measurement and analyzes the extension of the depletion zone with time and propagation of concentration perturbation. The systemic experiments were conducted using the nano-porous membranes with different pore diameters (I center dot 15 nm, I center dot 50 nm), the applied electric voltages (20-100 V) and the buffer solution pH values (pH 5.4, 9.2). According to dimensionless analysis, the extension of the depletion boundary was initially found to be independent of time and to have a non-linear variation for larger times. Based on Nernst-Planck equation, a one-dimensional wave equation is obtained under certain hypothesis, which also shows the propagation of concentration perturbation in depletion zone with constant speed at the initial time.
KeywordIon-depletion And Enrichment Depletion Extension Propagation Velocity Hybrid Micro/nano-channels Sample Preconcentration Nanofluidic Channels Transport Enrichment Separation Devices Chip Flow
Subject AreaScience & Technology - Other Topics ; Instruments & Instrumentation ; Physics
DOI10.1007/s10404-011-0828-z
URL查看原文
Indexed BySCI ; EI
Language英语
WOS IDWOS:000296013400012
WOS KeywordSAMPLE PRECONCENTRATION ; NANOFLUIDIC CHANNELS ; TRANSPORT ; ENRICHMENT ; SEPARATION ; DEVICES ; CHIP ; FLOW
WOS Research AreaScience & Technology - Other Topics ; Instruments & Instrumentation ; Physics
WOS SubjectNanoscience & Nanotechnology ; Instruments & Instrumentation ; Physics, Fluids & Plasmas
Funding OrganizationThe authors wish to acknowledge, with thanks, the financial support of the National Basic Research Program of China (2007CB714501), Knowledge Innovation Program of CAS (KJCX2-YW-H18) and the National Natural Science Foundation of China (10872203). The authors thank Trevor H. Moulden for useful discussions.
DepartmentLNM微纳米流体力学
Classification一类
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Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/44898
Collection非线性力学国家重点实验室
Corresponding AuthorSilber-Li, Z (reprint author), Chinese Acad Sci, State Key Lab Nonlinear Mech, Inst Mech, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Yu Q,Li ZH,Silber-Li, Z . Measurements of the ion-depletion zone evolution in a micro/nano-channel[J]. Microfluidics and Nanofluidics,2011,11(5):623-631
APA 余群,李占华,&Silber-Li, Z .(2011).Measurements of the ion-depletion zone evolution in a micro/nano-channel.Microfluidics and Nanofluidics,11(5),623-631.
MLA 余群,et al."Measurements of the ion-depletion zone evolution in a micro/nano-channel".Microfluidics and Nanofluidics 11.5(2011):623-631.
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