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Study of Electrokinetic Pumping Using Charged Membranes
|關鍵字:||Nanoscale charged capillary;帶電奈米毛細圓管;Electrokinetic energy conversion;Pressure-current curve (P-Q curve);Pressure-current curve (P-I curve);Presssure head and Pumping efficiency;電動能量轉換;壓力-流量曲線(P-Qcurve);壓力-電流曲線(P-I curve);壓力位勢及泵浦效率||出版社:||機械工程學系所||引用:||參考文獻  R. J. Hunter, “Zeta potential in colloid science, Principles and Applications,” Academic press (1981) New York.  S. A. Mirbozorgi, H. Niazmand, M. Renksizbulut,“Eletro-osmotic flow in reservoir-connected flat microchannels with non-uniform zeta potential,” Journal of Fluids Engineering 128 1133 (2006)  Y. Kang, C. Yang, X. Huang, “Analysis of the electroosmotic flow in a microchannel packed with homogeneous microspheres under eletrokinetic wall effect,” International Journal of Engineering Science 42 (2004) 2011-2027.  R.-J. Yang, L.-M. Fu, C.-C. Hwang,“Electroosmotic Entry Flow in a Microchannel,” Journal of Colloid and Interface Science 244 (2001) 173-179  S. Yao and J. G. Santiago,“Porous glass electroosmotic: theory,” Journal Colloid of and Interface Science 268 (2003) 133-142.  D.Stein, M. Kruithof, C. Dekker,“Surface-Charged-Governed Ion Transport in Nanofludic Channels,” The American Physical Society (2004) 035901-3  P. H. Paul, D. W. Arnold, D. J. Rakestraw,“Electrokinetic generation of high pressures using porous microstrutures,” in: microTAS-98, Banff, Canada, 1998.  S. Zeng, C. Chen, J. C. Mikkelsen, J. G. Santiago, “Fabrication and characterization of electrokinetic micro pumps,”Sensor Actuators B Chem. 79 (2001) 107-114.  S. Zeng, C. H. Chen, J. G. Santiago, J.-R. Chen, R. N. Zare, J. A. Tripp, F. Svec, J. M. J. Frechet, “Electroosmotic flow pumps with polymer frits,”Sens . Actuators B Chem. 82 (2002) 209-212.  P. Wang, Z. Chen, H. Chang, “A new electro-osmotic pump based on silica monoliths,” Sensors and Actuators B 113 (2006) 500-509.  C.-H. Chen and J.G. Santiago, “A Planar Electroosmotic Micro- pump,”J. of MEMS. 11 (2002) 672-683.  J. Y. Min, E. F. Hasselbrink, S. J. Kim,“On the efficiency of electrokinetic pumping of liquids through nanoscale channels,” Sensors and Actuators B 98 (2004) 368-377.  F. H. Heyden, D. J. Bonthuis, D. Stein, C. Meyer, C. Dekker, “Eletrokinetic Energy Conversion Efficiency in Nanofludic Channels,”American Chemical Society 6 (2006) 2232-2237.  X. Xuan, D. Li, “Thermodynamic analysis of eletrokinetic energy Conversion,” Journal of Power Sources (2005) xxx-xxx.  R. F. Probstein, “Physicochemical Hydrodynamics,” second ed., Wiley, New York (1994).||摘要:||
In this study, electrokinetic energy conversion involving the pumping power generation is investigated using membrane as the material. Based on the structural characteristic of membrane, a physical model containing a nanoscale finite-length charged cylindrical capillary tube and reservoirs connected at its ends is established. A numerical model solving the fluid flow, ion transport, electrical potential distribution and electric current flow is established without the assumptions made in the one-dimensional analysis reported in the literature. Using these results, the pressure-flow rate (P-Q), pressure-current (P-I) curves and the pumping efficiency can be found.
The Potassium chloride (KCl) with bulk concentration in the range of 10-6 to 10-2M is used as the working fluid. The capillary tube radius and surface charge density are chosen in the ranges of 10 to 100nm and -110-3 to -510-3 C/m2, respectively. It is found that the pumping efficiency is inter-related by the fluid flow and ion distribution which depend on the externally applied voltage, pressure head generated, surface charge density and capillary tube size. For a given capillary tube radius and KCl bulk concentration, pumping efficiency is found to increases with the increase of surface charge density. For fixed surface charge density and capillary tube radius case, efficiency varies with the KCl bulk concentration with a maximum value occurs at bulk concentration of 10-4M. At high bulk concentrations, conversion efficiency increases with the decrease in bulk concentration. In the low bulk concentrations, conversion efficiency is found to slightly decrease with the decrease in bulk concentration. Under the conditions of fixed surface charge density and KCl bulk concentration, an optimum capillary radius that producing maximum efficiency can be found. The maximum pressure head generated, an indication of the pump performance, is found to depend on the surface charge density, capillary size and bulk concentration of working fluid.
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