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Micro elastofluidic liquid diode for programmable unidirectional flow control.

Haotian Cha1, Fariba Malekpour Galogahi1, Quang Thang Trinh1

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Summary
This summary is machine-generated.

This study introduces a novel microfluidic platform with a chevron-ratchet design for controllable liquid transport. The platform allows for tunable, reversible liquid diode behavior in wearable biosensors without pumps.

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Area of Science:

  • Microfluidics
  • Surface Science
  • Wearable Technology

Background:

  • Controllable liquid transport is crucial for wearable biosensing platforms.
  • Unidirectional flow offers passive liquid movement but lacks real-time tunability in most designs.
  • Existing methods for unidirectional flow have limited adaptability and reconfigurability.

Purpose of the Study:

  • To develop a tuneable open-channel microfluidic platform with reversible liquid diode behavior.
  • To enable dynamic modulation of flow directionality and velocity.
  • To demonstrate a passive, pumpless approach for wearable diagnostics and adaptive liquid routing.

Main Methods:

  • Developed a microfluidic platform with chevron-ratchet geometry.
  • Utilized plasma-induced wettability modulation and mechanical stretching for flow control.
  • Established a theoretical force model and conducted numerical simulations based on energy-minimization principles.

Main Results:

  • Demonstrated three distinct flow regimes: pinned, unidirectional, and bidirectional.
  • Achieved programmable switching of flow states and geometry-sensitive pinning thresholds via mechanical strain.
  • Validated sustained unidirectional transport using a hydrogel sweat-acquisition interface.

Conclusions:

  • The developed platform offers a simple, tuneable, and reversible liquid diode behavior.
  • Surface wettability tuning and mechanical stretching are effective for dynamic flow modulation.
  • The open-channel microfluidic platform shows significant translational potential for wearable diagnostics and flexible microfluidic circuitry.