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Updated: May 14, 2026

Optimization of Flow Cytometric Sorting Parameters for High-Throughput Isolation and Purification of Small Extracellular Vesicles
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Optimization of Flow Cytometric Sorting Parameters for High-Throughput Isolation and Purification of Small Extracellular Vesicles

Published on: January 20, 2023

Passive droplet sorting using viscoelastic flow focusing.

Andrew C Hatch1, Apurva Patel, N Reginald Beer

  • 1Biomedical Engineering, University of California-Irvine, CA 92697, USA. ahatch@uci.edu

Lab on a Chip
|February 6, 2013
PubMed
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This study demonstrates passive hydrodynamic droplet sorting in microfluidic channels by tuning fluid properties. This method achieves high-frequency, size-independent droplet separation without active control mechanisms.

Area of Science:

  • Fluid dynamics
  • Microfluidics
  • Rheology

Background:

  • Microfluidic droplet manipulation is crucial for various applications.
  • Passive sorting methods offer advantages in simplicity and cost-effectiveness.
  • Understanding droplet behavior in viscoelastic fluids is key for advanced sorting.

Purpose of the Study:

  • To investigate passive hydrodynamic droplet sorting in microfluidic channels.
  • To explore the influence of intrinsic viscoelastic fluid properties on droplet migration.
  • To achieve size-independent droplet sorting and high enrichment factors.

Main Methods:

  • Utilizing microfluidic channels to study droplet behavior.
  • Tuning droplet and continuous phase properties (viscosity, viscoelasticity).

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Generation of Size-controlled Poly (ethylene Glycol) Diacrylate Droplets via Semi-3-Dimensional Flow Focusing Microfluidic Devices
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Generation of Size-controlled Poly (ethylene Glycol) Diacrylate Droplets via Semi-3-Dimensional Flow Focusing Microfluidic Devices

Published on: July 3, 2018

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Last Updated: May 14, 2026

Optimization of Flow Cytometric Sorting Parameters for High-Throughput Isolation and Purification of Small Extracellular Vesicles
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Published on: January 20, 2023

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Generation of Size-controlled Poly (ethylene Glycol) Diacrylate Droplets via Semi-3-Dimensional Flow Focusing Microfluidic Devices

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  • Analyzing lateral droplet migration in response to shear gradients.

    • Main Results:

    • Droplets migrate towards high shear gradients (walls) for viscosity ratios (κ) of 0.5-10 in weakly viscoelastic fluids.
    • Droplets migrate towards low shear gradients (centerline) for other κ-values or Newtonian fluids.
    • Strongly viscoelastic fluids with low interfacial tension induce edge migration even for κ < 0.5.
    • Achieved >200 Hz sorting frequencies and >100 fold enrichment factors.
    • Demonstrated sorting of 1 cPs and 5 cPs aqueous droplets with specific κ-values.

    Conclusions:

    • Passive hydrodynamic sorting based on viscoelastic properties is feasible and efficient.
    • The method allows for size-independent droplet separation.
    • High sorting frequencies and enrichment factors can be achieved without active control.