Department of Mechanical Engineering, National Chung Hsing University, Taichung, Taiwan.
Electrophoresis. 2010 Jan;31(3):535-45. doi: 10.1002/elps.200900409.
An analytical study on the effect of electrolyte types on the electrokinetic energy conversion is presented using nanoscale cylindrical capillary, which is either positively or negatively charged. The sign of surface charge determines the role and concentration magnitude of ions in the capillary and the energy conversion performance. Our study shows that the electrokinetic energy conversion performance (maximum efficiency, pressure rise and streaming potential) are approximately identical for 1:1 (KCl), 2:1 (CaCl2) and 3:1 (LaCl3) electrolytes when capillary is positively charged. For negatively charged capillary, energy conversion performance degrades significantly with the increase of counter-ion valence. For both positively and negatively charged capillaries, higher maximum efficiency can be resulted in low bulk concentration and surface charge density regimes. However, high maximum pressure rise generation for the pumping is found in the low bulk concentration and high surface charge density regimes. For the electric power generation, higher maximum streaming potential is found when both bulk concentration and surface charge density are low.
本文使用纳米级圆柱形毛细管（带正电荷或负电荷）对电解质类型对电动能量转换的影响进行了分析研究。表面电荷的符号决定了毛细管中离子的作用和浓度大小，以及能量转换性能。我们的研究表明，当毛细管带正电荷时，1:1（KCl）、2:1（CaCl2）和 3:1（LaCl3）电解质的电动能量转换性能（最大效率、升压和流动电势）大致相同。对于带负电荷的毛细管，随着抗衡离子价数的增加，能量转换性能显著下降。对于带正电荷和负电荷的毛细管，在低本体浓度和表面电荷密度区域可以产生更高的最大效率。然而，在低本体浓度和高表面电荷密度区域可以产生更高的最大升压以进行泵送。对于发电，当本体浓度和表面电荷密度都低时，会发现最大流动电势更高。
