Analysis of ionic conductance of carbon nanotubes
Name
PhysRevE.94.050601.pdf
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377.78 KB
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Adobe PDF
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Author(s)
Biesheuvel, P. M.
Bazant, Martin Z
Date Issued
November 2016
Journal
Physical Review E
Publisher
American Physical Society
Citation
Biesheuvel, P. M. and Bazant, M. Z. "Analysis of ionic conductance of carbon nanotubes." Physical Review E 94, no. 050601(R) (2016 November): 1-4 ©2016 American Physical Society
Version
Final published version
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 a function of pore size, salt concentration c, and pH. Using realistic values for surface site density and pK, SC theory well describes published experimental 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∝sqrt[c], while for realistic salt concentrations, SC theory does not lead to a simple power law for G(c).
MIT Department
Massachusetts Institute of Technology. Department of Chemical Engineering
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DOI of Published Version
https://doi.org/10.1103/PhysRevE.94.050601
