Ionic Current Through Carbon Nanotubes

J.H. Park, and P. Krstic
Oak Ridge National Laboratory, Oak Ridge, TN, USA

Ionic current through an electrolyte filling a carbon nanotube (CNT) is characterized by unusually high current values, due to the strong slip of the fluid at the inner surface of the nanotube, as well as of a dominating role of electro-osmotic component. Using COMSOL, we explore the fundamental features of this phenomenon with respect to the CNT length and excess charge inside the tube. COMSOL Multiphysics, as well as the Chemical Engineering Module and MEMS Module are used in this research.

In this study we focus to the effects of length and bulk concentration at the ionic current along with the detailed understanding of physical phenomena (ion accumulation/depletion, interference between nanofluidics inside tube and microfluidics in reservoirs). The simulation results are compared with available experimental data .