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Design and evaluation of microfluidic devices for two-dimensional spatial separations.

Ekaterina Davydova1, Sam Wouters2, Sander Deridder2

  • 1Analytical Chemistry Group, Van't Hoff Institute for Molecular Sciences, University of Amsterdam, P.O. Box 94157, 1090 GD Amsterdam, The Netherlands.

Journal of Chromatography. A
|January 27, 2016
PubMed
Summary

This study optimized chip designs for two-dimensional spatial liquid chromatography using computational fluid dynamics. Key improvements involved managing flow distribution and reducing peak remixing for enhanced separation performance.

Keywords:
Computational fluid dynamicsMicrofluidic devicesSpatial separation systemsTwo-dimensional liquid chromatography

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Area of Science:

  • Analytical Chemistry
  • Separation Science
  • Microfluidics

Background:

  • Comprehensive two-dimensional spatial liquid chromatography (2D-LC) offers enhanced separation power.
  • Optimizing chip design is crucial for efficient 2D-LC performance and overcoming inherent limitations.

Purpose of the Study:

  • To investigate and optimize chip designs for 2D-LC.
  • To identify and address performance bottlenecks in spatial 2D-LC systems.

Main Methods:

  • Computational fluid dynamics (CFD) simulations were used to evaluate chip designs.
  • Experiments were conducted on microfluidic chips with controlled structural imperfections.
  • Flow resistance and constrictions were implemented to mitigate flow divergence issues.

Main Results:

  • A bifurcating distributor with a 140° angle promoted homogeneous velocity fields.
  • CFD accurately predicted performance under channel obstruction, with split peaks observed at 75% blockage.
  • Flow resistance (1.0×10^11 m^-2) reduced sample divergence by 10x; constrictions reduced it by 5x.

Conclusions:

  • Sample divergence into the flow distributor and channel discretization are key limitations in spatial 2D-LC.
  • Flow resistance and optimized chip geometries can significantly improve sample handling and reduce peak remixing.
  • Further investigation into chip designs is needed to fully resolve channel discretization issues.