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Microfluidic Chips Controlled with Elastomeric Microvalve Arrays
18:11

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Published on: October 1, 2007

An electrowetting microvalve: numerical simulation.

Kamran Mohseni1, Ali Dolatabadi

  • 1Department of Aerospace Engineering Sciences, University of Colorado, Boulder, CO 80309-0429, USA. Kamran.Mohseni@colorado.edu

Annals of the New York Academy of Sciences
|November 25, 2006
PubMed
Summary

This study simulates a zero-leakage microvalve using a liquid droplet as an electrically controlled gate. Microvalve performance is sensitive to T junction geometry, suggesting improved microfluidic device sensitivity.

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Area of Science:

  • Microfluidics
  • Surface Science
  • Electrical Engineering

Background:

  • Microvalves are crucial for controlling fluid flow in microfluidic devices.
  • Achieving zero leakage in microvalves remains a significant challenge.
  • Electrically tunable liquid droplets offer a potential solution for microvalve actuation.

Purpose of the Study:

  • To investigate the numerical simulation of a zero-leakage microvalve.
  • To explore the use of a liquid droplet as an electrically controlled gate.
  • To analyze the impact of T junction geometry on microvalve performance.

Main Methods:

  • Numerical simulation of fluid flow and droplet behavior.
  • Modeling electrowetting effects via modified boundary conditions.
  • Investigating droplet actuation by altering surface tension with an electric field.

Main Results:

  • The liquid droplet effectively regulates flow in a T junction.
  • Microvalve pressure breakdown is significantly influenced by T junction corner geometry.
  • The electrowetting effect is successfully incorporated into the simulation.

Conclusions:

  • The proposed microvalve design demonstrates potential for zero leakage.
  • Optimizing T junction geometry is key to enhancing microvalve performance.
  • This droplet-actuated microvalve can improve sensitivity in microfluidic systems.