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標題: 帶電薄膜與電動效應應用於能量轉換之研究
Study of Electrokinetic Energy Conversion Using Charged Membranes
作者: 廖振程
Liao, Cheng-Chen
關鍵字: Electrokinetic energy conversion;電動能量轉換;streaming potential;流動電位
出版社: 機械工程學系所
引用: 【1】F.A. Morrison, J.F. Osterle, J. Chem. Phys. 43 (1965) 2111-2114 【2】X. Xuan, D. Li, Thermodynamic analysis of electrokinetic energy conversion, Journal of Power Sources 156 (2006) 677-684 【3】J.Y. Min, E.F. Hasselbrink, S.J. Kim, On the efficiency of electrokinetic pumping of liquids through nanoscale channels, Sensor and Actuators B 98 (2004) 368-377 【4】H.J. Frank, van der Heyden, D. Stein, C. Dekker, Streaming currents in a single nanofluidic channel , Physical Review Letters PRL 95 (2005) 116104-116108 【5】H. Daiguji, P. Yang, A. Majumdar, Ion transport in nanofludic channels , Nano Letters 4 No.1 (2004) 137-142 【6】T. Postler, Z. Slouka, M. Svoboda, M. Pribyl, D. Snita, Parametrical studies of electroosmotic transport characteristics in submicrometer channels , Journal of Colloid and Interface Science 320 (2008) 321-332 【7】N. Scales, R.N. Tait, Modellng electroosmotic and pressure-driven flows in porous microfluidic devices: Zeta potential and porosity changes near the channel walls ,The Journal of Chemical Physics 125, (2006) 094714 【8】A. Mansouri, C. Scheuerman, S. Bhattaacharjee, D.Y. Kwok, L. W. Kostiuk , Transient streaming potential in a finite length mocrochannel, Journal of Colloid and Interface Science 292 (2005)567-580 【9】Y. Kang, C. Yang, X. Huang, Analysis of the electroosmotic flow in a microchannel packed with homogeneous microspheres under electrokinetic wall effect , International Journal of Engineering Science 42 (2004) 2011-2027 【10】H. Daiguji, P. Yang, A.J. Szeri , A. Majumdar , Electrochemo- mechanical energy conversion in nanofluidic channels , Nano Letters 4, (2004) 2315-2321 【11】H.J. Frank, van der Heyden, D.J. Bonthuis, D. Stein, C. Meyer , C. Dekker , Electrokinetic energy conversion efficiency in nanofluidic channels , Nano Letters 6 (2006) 2232-2237 【12】M.C. Lu, S.S. Satyanarayana, R. Karnik, A. Majumdar, C.C. Wang, A mechanical-electrokinetic battery using a nano-porous membrane 【13】Hunter, R J. Zeta Potential in Colloid Science; Academic Press: London, 1981 【14】J. Israelachvili, Intermolecular and Surface Force, second ed., Academic Press, London, 1992. 【15】J.F. Osterle, Electrokinetic energy converson J. Appl. Mech.31 (1964) 161-4 【16】D. Li, Electrokinetics in Microfludics, Elsevier Academic Press, Burlington,MA,2004. 【17】Y.G. Gu and D.Q. Li, J. Colloid Interface Sci.226,328 (2000). 【18】Brett, C.M.A.; Brett, A. M. O. Electrochemistry, principles,methods, and applications;Oxford University Press: Oxford,1993 【19】H. Daiguji, Y. Oka , T. Adachi , K. Shirono , Theoretical study on the efficiency of nanofluidic batteries , Electrochemistry Communications 8 (2006) 1796-1800 【20】J.Y. Min, E.F. Hasselbrink, S.J. Kim, on the efficiency of electrokinetic pumping of liquids through nanoscale channels, Sensor and Actuators B 98 (2004) 368-377
於數值模擬中使用濃度從10-5到10-2M 的KCl溶液作為工作流體,毛細管孔道半徑為10nm〜100nm,壁面電荷密度為 〜 C/m2的條件下,可得知電動效率與外加壓力下的流體流動、離子分布產生的流動電位及壁面帶電密度和毛細管孔道半徑有關。對於一固定孔徑半徑而言,電動效率會隨著壁面電荷密度增加而增加。而在固定壁面電荷密度與孔道半徑條件下,電動效率約在10-4M時,會有最大值的產生。一般而言在高濃度下,效率會隨著濃度減少而增加,但當濃度低過於某一濃度時,效率反而會有下降的趨勢。在固定壁面電荷密度及濃度條件下,將會有一個最佳的孔道半徑可以獲得最大電動效率。最大流動電位可視為一個電動效率的指標,普遍認為與壁面電荷密度、孔道半徑及工作流體的濃度有關。

In this study, electrokinetic energy conversion involving the electric 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 electric current-potential (I-V), electric current-flow rate (I-Q) curves and the electric power generation efficiency can be found.
The Potassium chloride (KCl) with bulk concentration in the range of 10-5 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 to C/m2, respectively. It is found that the electric power generation efficiency is inter-related by the fluid flow and ion distribution which depend on the externally applied pressure difference, resulted streaming potential, surface charge density and capillary tube size. For a given capillary tube radius and KCl bulk concentration, electric power generation 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 efficiency occurs when bulk concentration is10-4M. At high bulk concentrations, efficiency increases with the decrease in bulk concentration while efficiency is found to decrease with the decrease in bulk concentration in when bulk concentration is low. Under the conditions of fixed surface charge density and KCl bulk concentration, an optimum capillary radius that producing maximum conversion efficiency can be found. The maximum streaming potential, an indication of the electric power generation performance, is found to depend on the surface charge density, capillary size and bulk concentration of working fluid.
其他識別: U0005-2008200815184000
Appears in Collections:機械工程學系所

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