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Negative memory capacitance and ionic filtering effects in asymmetric nanopores.

Nasim Farajpour1, Y M Nuwan D Y Bandara1, Lauren Lastra1

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A new Warburg-like element explains anomalous nanopore electrical signals, including negative capacitance and low-pass filtering during DNA translocation. This model accounts for ion concentration polarization and energy barriers, improving understanding of molecular signal transduction.

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Area of Science:

  • Nanopore science
  • Physical chemistry
  • Molecular biophysics

Background:

  • The standard model for ion-filled nanopores uses a parallel resistor-capacitor circuit.
  • Anomalous electrical behaviors like negative capacitance and low-pass filtering in conical nanopores are not fully explained by this model.

Purpose of the Study:

  • To propose and validate a new electrical element for nanopore modeling.
  • To explain anomalous phenomena such as negative capacitance and low-pass filtering in conical nanopores.
  • To investigate the mechanism of molecular translocation signal transduction.

Main Methods:

  • Modeling conical nanopore electrical properties with a Warburg-like element.
  • Experimental testing using DNA translocation through nanopores.
  • Analysis of transient pore occlusion events with sufficient amplifier bandwidth.

Main Results:

  • The proposed Warburg-like element successfully explains negative capacitance and low-pass filtering (Warburg filtering).
  • Negative capacitance exhibits long equilibration times and memory effects at negative voltages.
  • Ionic phenomena, specifically concentration polarization and activation energy, are mechanistically linked to the Warburg element.

Conclusions:

  • The Warburg-like element is essential for accurately modeling conical nanopore behavior.
  • Molecular translocation signal transduction involves complex, nonlinear ion storage and dis-equilibrium, not just resistance changes.
  • This work provides deeper insights into the electrical signal generation during molecular transit through nanopores.