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Monitoring Protein Adsorption with Solid-state Nanopores
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Numerically testing phenomenological models for conductance of a solid-state nanopore.

Binquan Luan1

  • 1IBM T J Watson Research Center, 1101 Kitchawan Road, Yorktown Heights, NY 10598, USA.

Nanotechnology
|January 16, 2015
PubMed
Summary

The ionic conductance of solid-state nanopores is crucial for biomolecule analysis. This study reveals that common conductance models can be inaccurate, especially for charged nanopores in intermediate ion concentrations, providing criteria for correct application.

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Area of Science:

  • Nanotechnology and Nanoscience
  • Physical Chemistry
  • Biophysics

Background:

  • Solid-state nanopores are vital tools for analyzing biomolecules.
  • Ionic conductance models are widely used but lack theoretical rigor and validation.
  • Existing models assume conductance is a sum of bulk, surface, and access contributions.

Purpose of the Study:

  • To rigorously assess the accuracy of phenomenological ionic conductance models for solid-state nanopores.
  • To investigate the influence of ion concentration and surface charge on model accuracy.
  • To provide guidelines for the appropriate application of these models.

Main Methods:

  • Numerical modeling of ionic conductance in solid-state nanopores.
  • Simulation of charged nanopores in electrolytes with varying ion concentrations.
  • Comparison of numerical results with predictions from phenomenological models.

Main Results:

  • Phenomenological models can overestimate ionic conductance, particularly for charged nanopores in intermediate ion concentrations (e.g., 50 mM).
  • Both ion concentration and surface charge significantly impact the accuracy of phenomenological conductance calculations.
  • Discrepancies between model predictions and numerical simulations were quantified.

Conclusions:

  • The accuracy of phenomenological ionic conductance models is not universally guaranteed.
  • Careful consideration of ion concentration and surface charge is necessary when applying these models.
  • This work establishes criteria for the valid use of phenomenological results in nanopore research.