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Numerical study on the Ionic current characteristic in nanopores
|關鍵字:||nanopore;奈米孔道;I-V curve;ionic current;I-V curve;sidewalls effect;電流-離子電流;電流-電壓曲線;邊壁影響||出版社:||機械工程學系所||引用:|| Tegenfeldt JO, Prinz C, Cao H, Huang RL, Austin RH, Chou SY, Cox EC,St- um JC (2004) Micro-and nanofluidics for DNA analysis. Analytical and Bioanalyt ical Chemistry 378: 1678-1692.  Mohamadi MR, Mahmoudian L, Kaji N, Tokeshi M, Chuman H, Baba Y (2006) Nanotechnology for genomics & proteomics. Nano Today 1: 38-45.  Schmuhl R, Keizer K, vanadenaBerg A, tenaElshof J, Blank D (2004) Controlling the transport of cations through permselective mesoporous alumina layers byman- ipulation of electric field and ionic strength. Journal of colloid and interface science 273: 331-338.  Wang Y, Pant K, Chen Z, Wang G, Diffey W, Ashley P, Sundaram S (2009) Nue- rical analysis of electrokinetic transport in micro-nanofluidic interconnect precon- centrator in hydrodynamic flow. Microfluidics and Nanofluidics 7:683-696.  Wei C, Bard A, Feldberg S (1997) Current rectification at quartz nanopipet electr- odes. Anal Chem 69: 4627-4633.  Siwy Z (2006) Ion-current rectification in nanopores and nanotubes with broken symmetry. Advanced Functional Materials 16: 735-746.  Siwy Z, Fuli ski A (2004) A nanodevice for rectification and pumping ions. American Journal of Physics 72: 567.  Liu Q, Wang Y, Guo W, Ji H, Xue J, Ouyang Q (2007) Asymmetric properties of ion transport in a charged conical nanopore. Physical Review E 75: 51201.  Kosińska I, Goychuk I, Kostur M, Schmid G, Hanggi P (2008) Rectification in synthetic conical nanopores: A one-dimensionalPoisson-Nernst-Planck model.Physical Review E 77: 31131.  Cervera J, Schiedt B, Ramirez P (2005) A Poisson/Nernst-Planck model for ionic transport through synthetic conical nanopores. EPL (Europhysics Letters) 71: 35-41. White H, Bund A (2008) Ion current rectification at nanopores in glassmembranes. Langmuir 24: 2212-2218. Qian S, Joo S, Ai Y, Cheney M, Hou W (2009) Effect of linear surface charged non-uniformities on the electrokinetic ionic current rectification in conical nanopores. Journal of colloid and interface science 329: 376-383.  Vlassiouk I, Smirnov S, Siwy Z (2008) Nanofluidic Ionic Diodes. Comparison of Analytical and Numerical Solutions. ACS Nano 2: 1589-1602.  Ramirez P, Gomez V, Cervera J, Schiedt B, Mafe S (2007) Ion transport and sele- ctivity in nanopores with spatially inhomogeneous fixed charge distributions. The Journal of chemical physics 126: 194703.  Vlassiouk I, Smirnov S, Siwy Z (2008) Ionic Selectivity of Single Nanochannels. Nano Letters 8: 1978-1985. Daiguji H (2010) Ion transport in nanofluidic channels. Chemical Society Reviews 39: 901-911. Karnik R, Fan R, Yue M, Li D, Yang P, Majumdar A (2005) Electrostatic control of ions and molecules in nanofluidic transistors. Nano Lett5: 943-948.  Schoch R, Han J, Renaud P (2008) Transport phenomena in nanofluidics. Review of Modern Physics 80: 839-883. Kim S, Wang Y, Lee J, Jang H, Han J (2007) Concentration polarization and nonlinear electrokinetic flow near a nanofluidic channel. Physical review letters 99: 44501. Rubinstein I, Zaltzman B (2000) Electro-osmotically induced convectionat a permselective membrane. Physical Review E 62: 2238-2251. Chein R, and Chung B (2009) Electrokinetic transport inmicro-nanofluidic systems with sudden-expansion contraction cross sections. 2009 ASME Micro/nano heat transfer internation conferenceShanghai, China. Xie Y, Wang X, Xue J, Jin K, Chen L, Wang Y (2008) Electric energy generation in single track-etched nanopores. Applied Physics Letters 93: 163116. Stein D, Kruithof M, Dekker C (2004) Surface-charge-governed iontransport in nanofluidic channels. Physical review letters 93: 35901. Schoch R, Renaud P (2005) Ion transport through nanoslits dominated by theeffective surface charge. Applied Physics Letters 86: 253111.||摘要:||
In this study, the ionic transport characteristics through a cylindrical nanochannel with charged entrance and exit and linearly varied surafce charge density along the nanochannel wall is numerically investigated. The ends of the nanochannel was connected with the microchanels which were regarded as the reservoirs. The Nernst-Planck equation that governed the ionic distribution was solved along with the Poission equation and Navier-Stokes equations.
Based on the nuemrical resulted of current-voltage curves obtained, it was found that the charge entrance can enhance the concentraion polarization in the anodic side of the nanochannel as compared with the uncharged entrance case. As comapred with conventional conducting membrane, no limiting current regime can be obserevd when the chraged entrance is included. Instead the current varies quradratically with the applied voltage.
Current rectification can be observed for nanochannel with and without charged entrance and exit when channel wall has linearly varied surface charge density. The numerical results indicated that the current rectification factor is higher for the nanochannel with charged entrance than that without charged entrance. The current rectification factor also found to increase with decrease of bulk concentration and increases of the surface charge density magnitude, slope, and charged entrance size.
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