Negative incremental resistance induced by calcium in asymmetric nanopores

Nano Letters
Z SiwyRobert S Eisenberg

Abstract

Single polymer nanopores with permanent surface charges act as rectifiers of ionic current. The pores are tapered cones with narrow openings of several nanometers and wide openings of approximately 1 mum. The pores are cation-selective, and in symmetric solutions of potassium chloride they rectify the flow of potassium ions from the small opening toward the wide opening. Millimolar concentrations of calcium reverse the rectification, and a negative incremental resistance is observed. These observations can be interpreted by a model containing flashing ratchets.

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Citations

Jan 1, 2008·European Journal of Applied Mathematics·A SingerR S Eisenberg
Jul 19, 2011·Analytical Chemistry·Boaz ViloznyNader Pourmand
Oct 1, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·Erastus GatebePunit Kohli
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May 8, 2019·Journal of the American Chemical Society·Zhongpeng ZhuLei Jiang
Nov 5, 2021·ACS Applied Materials & Interfaces·Jose J Perez-GrauSalvador Mafe

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