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We developed a 3D particle tracking system using optical tweezers to visualize fluid flow near glass nanopores. This method reveals polarity-dependent flow fields, enhancing our understanding of nanofluidics.

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Area of Science:

  • Nanofluidics
  • Biophysics
  • Optical Physics

Background:

  • Understanding fluid dynamics at the nanoscale is crucial for applications like drug delivery and filtration.
  • Previous methods for studying nanopore flow were limited in their ability to capture 3D dynamics.

Purpose of the Study:

  • To develop and validate a non-stereoscopic, video-based particle tracking system for 3D fluid flow analysis around glass nanopores.
  • To investigate voltage-driven flow fields in 3D volumes adjacent to conical nanopores.

Main Methods:

  • Utilized optical tweezers and a quadrant interpolation algorithm for video-based particle tracking.
  • Extended particle tracking capabilities to capture displacements outside the optical tweezers' trapping plane.
  • Employed a micromanipulator to automate the 3D mapping of fluid flow around angled nanopores.

Main Results:

  • Successfully mapped voltage-driven fluid flow in 3D volumes surrounding glass nanopores.
  • Observed distinct polarity-dependent flow fields, indicating directional fluid movement.
  • Demonstrated the system's ability to study flow from nanopores oriented at various angles.

Conclusions:

  • The developed system provides a novel approach for 3D nanofluidic characterization.
  • Observed flow patterns align with theoretical models of voltage-driven flow in conical nanopores.
  • The findings contribute to a deeper understanding of electrokinetic phenomena in confined geometries.