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Trapezoidal channels are widely used in irrigation systems due to their cost-effectiveness and efficiency in conveying water. Trapezoidal channels feature a flat bottom and sloping sides, making them stable and easier to construct compared to other shapes. The bottom width and side slope ratio are determined based on the required flow capacity and site conditions. The side slope is kept gentle for unlined channels to prevent soil erosion.Hydraulic parameters in channel design include the flow...
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Microvalve with Trapezoid-Shaped Cross-Section for Deep Microchannels.

Maho Kaminaga1, Tadashi Ishida2, Toru Omata2

  • 1Department of Mechanical Engineering, National Institute of Technology, Toyota College, 2-1 Eiseicho, Toyota 471-0067, Japan.

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Summary

Researchers developed a novel microvalve for deep microchannels, essential for handling large particles like cells. This innovation advances microfluidic systems in biology and particle manipulation.

Keywords:
inclined lithographymicrofluidic devicepneumatic microvalve

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Area of Science:

  • Microfluidics
  • Biotechnology
  • Mechanical Engineering

Background:

  • Microfluidic systems are crucial for handling biological samples like cells and microcapsules.
  • Existing microfluidic devices struggle with deep microchannels needed for large particle manipulation.
  • A lack of suitable microvalves hinders the integration of microfluidic devices for large particles.

Purpose of the Study:

  • To propose and fabricate a novel microvalve capable of closing deep microchannels.
  • To enable microfluidic handling of large particles, including three-dimensional (3D) cultured cells and microcapsules.
  • To enhance the integration of microfluidic devices for advanced biological applications.

Main Methods:

  • Developed a microvalve with a trapezoid-shaped cross-section for deep microchannels.
  • Utilized a double-inclined lithography process for fabricating the trapezoid-shaped cross-section.
  • Fabricated the microvalve by bonding three polydimethylsiloxane (PDMS) layers: liquid channel, membrane, and pneumatic channel.

Main Results:

  • Successfully demonstrated a microvalve capable of closing a 350 μm deep microchannel.
  • Confirmed that pneumatic pressure applied to the pneumatic channel inflates a membrane balloon, effectively closing the microchannel.
  • The microvalve is suitable for handling hundreds of micrometer-scale particles.

Conclusions:

  • The proposed trapezoid-shaped microvalve effectively seals deep microchannels, overcoming a key limitation in microfluidic device design.
  • This microvalve technology facilitates the manipulation and integration of microfluidic systems for handling large biological particles.
  • The developed microvalve represents a significant advancement for microfluidic applications in cell biology and particle sorting.