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Related Concept Videos

Capillary Electrophoresis: Applications01:30

Capillary Electrophoresis: Applications

Capillary electrophoretic separations offer various modes, each with unique applications. These modes include capillary zone electrophoresis, capillary gel electrophoresis, capillary array electrophoresis, capillary isoelectric focusing, capillary isotachophoresis, micellar electrokinetic chromatography, and capillary electrochromatography.
Capillary zone electrophoresis (CZE) separates ionic components based on their electrophoretic mobility. It has been used to separate proteins, amino acids,...
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Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.

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Related Experiment Video

Updated: Jun 7, 2026

Separating Beads and Cells in Multi-channel Microfluidic Devices Using Dielectrophoresis and Laminar Flow
09:45

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Published on: February 4, 2011

Sheathless elasto-inertial particle focusing and continuous separation in a straight rectangular microchannel.

Seungyoung Yang1, Jae Young Kim, Seong Jae Lee

  • 1Department of Chemical Engineering, Ajou University, Suwon 443-749, Republic of Korea.

Lab on a Chip
|October 27, 2010
PubMed
Summary

This study introduces Elasto-Inertial Particle Focusing, a sheathless method using viscoelastic flow in microchannels for precise particle alignment. This technique enables particle separation and has potential for advanced lab-on-a-chip devices.

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Published on: March 6, 2016

Area of Science:

  • Microfluidics
  • Biophysics
  • Polymer Science

Background:

  • Cost-effective lab-on-a-chip devices require efficient particle focusing.
  • Existing methods often need external forces or complex apparatus.

Purpose of the Study:

  • To demonstrate a novel sheathless particle focusing technique in a straight microchannel.
  • To investigate the mechanism of Elasto-Inertial Particle Focusing.

Main Methods:

  • Utilized a straight microchannel with pressure-driven flow.
  • Introduced poly(ethylene oxide) (PEO) as an elasticity enhancer.
  • Analyzed particle behavior under varying elasticity and inertia conditions.

Main Results:

  • Achieved sheathless particle focusing along the channel centerline using viscoelastic flow.
  • Observed 3D particle focusing resulting from the interplay of elasticity and inertia.
  • Demonstrated particle separation based on size (5.9 and 2.4 µm) in viscoelastic flow.

Conclusions:

  • Elasto-Inertial Particle Focusing is a viable method for sheathless particle manipulation.
  • The technique relies on the synergistic effects of elasticity and inertia.
  • This method can advance miniaturized flow cytometry and cell/particle manipulation devices.