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An Effective Capillary Valve Based on Micro-hole Array for Microfluidic Systems.

Yang Xie1,2, Hui You1,2, Zhiyuan Gao3

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Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry
|August 14, 2018
PubMed
Summary
This summary is machine-generated.

This study introduces an effective capillary microvalve for microfluidic systems. Utilizing a micro-hole array and Wenzel model, it achieves programmable fluid control with a 90° contact angle.

Keywords:
Microfluidic systemcapillary valvemicro-hole array

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Area of Science:

  • Microfluidics
  • Surface Science

Background:

  • Capillary force drives liquid flow in microchannels for portable devices.
  • Microfluidic systems require precise fluid control mechanisms.

Purpose of the Study:

  • To propose an effective capillary microvalve for microfluidic systems.
  • To achieve programmable control and easy fabrication of microvalves.
  • To investigate fluid flow dynamics using the Wenzel model.

Main Methods:

  • Fabrication of a microvalve using hot-embossing and hot-bonding.
  • Utilizing a micro-hole array and Wenzel model to influence fluid velocity.
  • Assessing valve function through liquid flow experiments.

Main Results:

  • The microvalve effectively slows fluid flow via an abrupt change in contact angle.
  • Optimal control was achieved at a contact angle of 90°.
  • Controlling time ranged from 177 to 213 seconds.

Conclusions:

  • The developed capillary microvalve demonstrates good performance and programmable control.
  • Surface roughness significantly impacts microvalve effectiveness.
  • This technology holds potential for portable medical testing devices.