Analysis of ionic conductance of carbon nanotubes

Abstract

We use space-charge (SC) theory (also called the capillary pore model) to describe the ionic conductance, $G$, of charged carbon nanotubes (CNTs). Based on the reversible adsorption of hydroxyl ions to CNT pore walls, we use a Langmuir isotherm for surface ionization and make calculations as function of pore size, salt concentration $c$, and pH. Using realistic values for surface site density and pK, SC theory well describes published experimentally data on the conductance of CNTs. At extremely low salt concentration, when the electric potential becomes uniform across the pore, and surface ionization is low, we derive the scaling $G\sim \sqrt{c}$, while for realistic salt concentrations, SC theory does not lead to a simple power law for $G(c)$.

References in corpus (3)

• Scaling behavior for ionic transport and its fluctuations in individual carbon nanotubes
• Analysis of electrolyte transport through charged nanopores
• Ionic transport through sub-10 nm diameter hydrophobic high-aspect ratio nanopores: experiment, theory and simulation

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