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Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals
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Oriented suspension mechanics with application to improving flow linear dichroism spectroscopy.

G Cupples1, D J Smith1, M R Hicks2

  • 1School of Mathematics, University of Birmingham, Birmingham B15 2TT, UK.

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|January 2, 2020
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Summary

This study models flow linear dichroism for pathogen detection, finding channel depth significantly enhances sensitivity. Oscillating flow also shows promise for analyzing small sample volumes.

Keywords:
Brownian suspensionsFokker–Planck equationflow-induced alignmentlinear dichroism spectroscopy

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Area of Science:

  • Biophysics
  • Fluid Dynamics
  • Synthetic Biotechnology

Background:

  • Flow linear dichroism (FLD) is a biophysical technique using shear-induced particle alignment.
  • Optimizing FLD sensitivity is crucial for applications like waterborne pathogen detection.

Purpose of the Study:

  • Develop a model for pressure-driven channel flow and particle orientation dynamics.
  • Optimize FLD signal for a hand-held synthetic biotechnology prototype.

Main Methods:

  • Coupled Fokker-Planck and narrow channel flow equations.
  • Modeled steady and oscillating flow of microscopic fiber suspensions.
  • Estimated linear dichroism signal considering biaxial orientation.

Main Results:

  • Increased channel depth significantly improves FLD signal compared to width.
  • Maximized alignment achieved with 2 mm channel depth and 5×10⁴ Pa m⁻¹ pressure gradient.
  • Oscillating flow provides comparable alignment to steady flow at optimal frequencies.

Conclusions:

  • Channel geometry, particularly depth, is key to enhancing FLD sensitivity.
  • Oscillating flow offers practical advantages for small sample analysis.
  • The model supports the development of sensitive, portable pathogen detection devices.