Electrokinetic Pumping And Energy Conversion At Nanoscales
arXiv:1411.5545 · doi:10.1002/elps.201400317
Abstract
The integration of the coupling effects of intrinsic wettability and surface charge in a nanochannel can cause non-intuitive behavior in the electrokinetic energy conversion processes. We demonstrate that in a nanofluidic device the energy conversion efficiencies may get amplified with an increase in surface charge density, not perpetually, but only over a narrow regime of low surface charges, and may get significantly attenuated to reach a plateau beyond a threshold surface charging condition. This results from the complex interplay between fluid structuration and ionic transport within a charged interfacial layer. We explain the corresponding findings from our molecular dynamics simulations with the aid of a simple modified continuum based theory. We attribute our findings to the four-way integration of surface charge, interfacial slip, ionic transport, and the water molecule structuration. The consequent complex non-linear nature of the energy transfer characteristics may bear far-ranging scientific and technological implications towards design, synthesis and operation of nano-batteries which can supply power at scales of the range molecular dimensions.
arXiv comment18 pages, 5 figures
References in corpus (7)
- Study of time-dependent CP violation in B0 -> J/Psi pi0 decays
- Ions at the air-water interface: An end to one hundred year old mystery?
- Hydrodynamics within the Electric Double Layer on slipping surfaces
- Liquid friction on charged surfaces: from hydrodynamic slippage to electrokinetics
- Direct mass measurements beyond the proton drip-line
- Interaction between scalar field and ideal fluid with inhomogeneous equation of state
- Effect of Electro-Osmotic Flow on Energy Conversion on Superhydrophobic Surfaces