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A Protocol for Real-time 3D Single Particle Tracking
10:16

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Published on: January 3, 2018

Rotational Fourier tracking of diffusing polygons.

Kenny Mayoral1, Terry P Kennair, Xiaoming Zhu

  • 1Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, California 90095, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|December 21, 2011
PubMed
Summary
This summary is machine-generated.

We measured the rotational Brownian motion of polygonal platelets near a wall. Depletion attractions reduced rotational diffusion, likely due to wall proximity, aiding in-plane analysis.

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Area of Science:

  • Physics
  • Materials Science
  • Physical Chemistry

Background:

  • Brownian motion describes random particle movement due to molecular collisions.
  • Depletion attractions are effective forces arising from excluded volume interactions.
  • Confining particles near a wall influences their dynamic behavior.

Purpose of the Study:

  • To measure the rotational Brownian motion of polygonal platelets near a wall.
  • To investigate the effect of depletion attractions on particle dynamics.
  • To develop a method for analyzing in-plane rotational trajectories.

Main Methods:

  • Optical microscopy was used to observe polygonal platelets in liquid.
  • Depletion attractions were employed to confine particles near a wall.
  • Fast Fourier Transforms (FFTs) of images were analyzed to determine rotational trajectories.
  • In-plane rotational diffusion coefficients were calculated.

Main Results:

  • Depletion attractions significantly reduced out-of-plane fluctuations, enabling in-plane imaging.
  • Rotational trajectories were determined independently of particle position using FFT analysis.
  • Measured in-plane rotational diffusion coefficients were smaller than bulk estimates.
  • The reduced diffusion is attributed to particle proximity to the wall.

Conclusions:

  • Confining polygonal platelets near a wall using depletion attractions facilitates accurate rotational motion analysis.
  • Wall proximity significantly impacts rotational diffusion, leading to lower coefficients than in bulk.
  • FFT-based analysis provides a robust method for tracking in-plane rotational dynamics.