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A Microfluidic-based Hydrodynamic Trap for Single Particles
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Single-molecule confinement with uniform electrodynamic nanofluidics.

Siddharth Ghosh1, Narain Karedla, Ingo Gregor

  • 1III. Institute of Physics - Biophysics and Complex Systems, University of Göttingen, Göttingen, Germany. sg915@cam.ac.uk.

Lab on a Chip
|August 8, 2020
PubMed
Summary
This summary is machine-generated.

Researchers developed a nanofluidic method to precisely track single molecules in liquid. This technique, using an all-silica environment, enables new possibilities for molecular studies and diagnostics.

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Area of Science:

  • Nanotechnology
  • Physical Chemistry
  • Biophysics

Background:

  • Handling single molecules in liquid is crucial for molecular studies and diagnostics.
  • Existing methods struggle to replicate nature's dynamic control over single molecules.
  • Surface interactions can alter a molecule's intrinsic properties, necessitating controlled environments.

Purpose of the Study:

  • To present a method for dynamic nanofluidic detection of single molecules in liquid.
  • To demonstrate precise control and observation of single-molecule dynamics.
  • To investigate confinement-induced molecular interactions and molecular shot noise.

Main Methods:

  • Utilizing an all-silica nanofluidic environment for electrokinetic handling of single molecules.
  • Employing two-focus fluorescence correlation spectroscopy (2fFCS) for 1D confined detection.
  • Fabricating high-throughput nanochannels for efficient molecular manipulation.

Main Results:

  • Successfully resolved molecular shot noise in single-molecule detection.
  • Recorded the motion of DNA fragments, carbon nanodots, and organic fluorophores in water.
  • Observed confinement-induced modifications in molecular interactions due to inter-molecular forces.

Conclusions:

  • The developed nanofluidic detection method allows for the resolution of single-molecule dynamics in a uniform dielectric environment.
  • Understanding molecular shot noise in confined systems provides fundamental insights.
  • This technique opens avenues for single-molecule experiments requiring precise dynamic manipulation.