Electrokinetic energy conversion efficiency of viscoelastic fluids in a polyelectrolyte-grafted nanochannel
Electrokinetic energy conversion efficiency of viscoelastic fluids in a polyelectrolyte-grafted nanochannel
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聚电解质接枝纳米通道中粘弹性流体的动电能量转换效率
DOI：
10.1016/j.colsurfb.2017.05.039
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发表时间：
2017-08-01
影响因子：
5.8
通讯作者：
Yang, Liangui
中科院分区：
文献类型：
--
作者：
Jian, Yongjun;Li, Fengqin;Yang, Liangui
为了进行广泛的调查的纳米流体装置的能量收集能力，我们提供了分析解决方案的流动电位和电动能量转换（EKEC）效率，通过考虑软纳米通道，刚性纳米通道，其表面被覆盖的带电纳米层，和粘弹性流变学的综合后果。采用麦克斯韦本构模型考虑流体的粘弹性，当驱动压力流的强迫频率与典型粘弹性流体的弛豫时间尺度的倒数相匹配时。我们比较了流动电位和EKEC效率与刚性纳米通道的流动电位和EKEC效率，刚性纳米通道的zeta电位等于软纳米通道的固-固界面处的静电电位。结果表明，当驱动压力梯度的强迫频率接近共振频率时，刚性纳米通道的最大流动电位和EKEC效率的不同峰值均大于柔性纳米通道.然而，在远离这些共振频率的大多数区域中可以发现软纳米通道的更增强的流动电位和EKEC效率。此外，还详细讨论了几个无量纲参数对EKEC效率的影响。最后，在给定的参数范围内，在本分析中得到的一些谐振频率处的最大效率约为25%。(C)2017 Elsevier B. V.版权所有。
In order to conduct extensive investigation of energy harvesting capabilities of nanofluidic devices, we provide analytical solutions for streaming potential and electrokinetic energy conversion (EKEC) efficiency through taking the combined consequences of soft nanochannel, a rigid nanochannel whose surface is covered by charged polyelectrolyte layer, and viscoelastic rheology into account. The viscoelasticity of the fluid is considered by employing the Maxwell constitutive model when the forcing frequency of an oscillatory driving pressure flow matches with the inverse of the relaxation time scale of a typical viscoelastic fluid. We compare the streaming potential and EKEC efficiency with those of a rigid nanochannel, having zeta potential equal to the electrostatic potential at the solid-polyelectrolyte interface of the soft nanochannels. Within the present selected parameter ranges, it is shown that the different peaks of maximal streaming potential and EKEC efficiency for the rigid nanochannel are larger than those for the soft nanochannel when forcing frequencies of the driving pressure gradient are close to resonating frequencies. However, more enhanced streaming potential and EKEC efficiency for a soft nanochannel can be found in most of the regions away from these resonant frequencies. Moreover, the influence of several dimensionless parameters on EKEC efficiency is discussed in detail. Finally, within the given parametric regions, the maximum efficiency at some resonant frequency obtained in present analysis is about 25%. (C) 2017 Elsevier B.V. All rights reserved.