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Determination of Zeta Potential via Nanoparticle Translocation Velocities through a Tunable Nanopore: Using DNA-modified Particles as an Example
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Electrokinetic particle translocation through a nanopore.

Ye Ai1, Shizhi Qian

  • 1Department of Mechanical and Aerospace Engineering, Old Dominion University, Norfolk, VA 23529, USA.

Physical Chemistry Chemical Physics : PCCP
|January 14, 2011
PubMed
Summary

This study models nanoparticle translocation through nanopores, revealing how electric fields and particle properties influence ionic current. Findings aid in developing advanced nanopore sensing technologies for bio-analysis.

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Area of Science:

  • Physics
  • Chemistry
  • Biotechnology

Background:

  • Nanopore sensing detects nanoparticles by monitoring ionic current changes during translocation.
  • Understanding electrokinetic particle behavior in nanopores is crucial for optimizing sensing applications.

Purpose of the Study:

  • To develop a transient continuum model for electrokinetic nanoparticle translocation through a nanopore.
  • To investigate the effects of electric fields, electrical double layer (EDL) thickness, and particle orientation on translocation dynamics and ionic current.

Main Methods:

  • Solving Nernst-Planck, Poisson, and Navier-Stokes equations using an arbitrary Lagrangian-Eulerian (ALE) method.
  • Simulating nanoparticle translocation under varying electric field strengths and EDL conditions.

Main Results:

  • Low electric fields cause current blockade; high fields enable electrophoresis.
  • Thick electrical double layers can lead to current enhancement or particle trapping.
  • Particle orientation significantly impacts translocation and current; high fields align particles.

Conclusions:

  • The developed model accurately predicts nanoparticle translocation phenomena observed experimentally.
  • Electric field strength, EDL, and initial particle orientation are key factors governing nanopore sensing.
  • This research provides insights for designing and improving nanopore-based analytical devices.