期刊
PHYSICAL REVIEW LETTERS
卷 114, 期 11, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.114.114501
关键词
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资金
- Basic Science Research Program [2013R1A1A1008125]
- Center for Integrated Smart Sensor - Global Frontier Project [CISS-2011-0031870]
- Future Based Technology Development Program (Nano Fields) [2012-0001033]
- Ministry of Science, ICT & Future Planning and Korean Health Technology RND Project, Ministry of Health and Welfare of the Republic of Korea [HI13C1468, HI14C0559]
- Korea Health Promotion Institute [HI13C1468070015] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2013R1A1A1008125, 2011-0031870] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Direct evidence is provided for the transition from surface conduction (SC) to electro-osmotic flow (EOF) above a critical channel depth (d) of a nanofluidic device. The dependence of the overlimiting conductance (OLC) on d is consistent with theoretical predictions, scaling as d(-1) for SC and d(4/5) for EOF with a minimum around d = 8 mu m. The propagation of transient deionization shocks is also visualized, revealing complex patterns of EOF vortices and unstable convection with increasing d. This unified picture of surface-driven OLC can guide further advances in electrokinetic theory, as well as engineering applications of ion concentration polarization in microfluidics and porous media.
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