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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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Zuzanna S. Siwy
University of California, Irvine
Matthew Powell
University of California, Irvine
Eric Kalman
University of California, Irvine
Nano Letters
University of California, Irvine
University of Maine
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Siwy et al. (Thu,) studied this question.
synapsesocial.com/papers/6a1d367533e2df9c962f2132 — DOI: https://doi.org/10.1021/nl0524290