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This study demonstrates a new thermally controllable material using microfluidic flows to create a polymer thermal switch. This bio-inspired approach filters near-infrared light and controls heat flow for advanced cooling applications.

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Area of Science:

  • Materials Science
  • Fluid Dynamics
  • Thermal Engineering

Background:

  • Developing advanced materials with tunable thermal properties is crucial for various technological applications.
  • Controlling heat transport at the microscale presents significant challenges in material design.
  • Bio-inspired engineering offers novel strategies for manipulating material behavior.

Purpose of the Study:

  • To engineer a composite polymer with a lower transition temperature, modulated by microfluidic flows.
  • To investigate the use of microfluidics for manipulating fluid-material interfaces and heat transport.
  • To develop a thermally controllable material capable of filtering near-infrared (NIR) irradiation and acting as a thermal switch.

Main Methods:

  • Utilizing multi microchannel fluidic flows to modulate volumetric flow rates.
  • Manipulating the fluid-material interface for controlled heat transport within a microfluidic platform.
  • Employing bio-inspired engineering, drawing parallels with nature's vasculature for irradiance absorption control.

Main Results:

  • Demonstrated the ability to control the structural assembly of a polymer into a thermal switch using microfluidic flows.
  • Showcased switchable control of conductance states (high/low) for targeted heat management.
  • Established that planar extensional flow in microfluidics directs the thermodynamic state of the composite for efficient cooling.

Conclusions:

  • Microfluidic flow modulation offers a precise method for tuning composite polymer thermal properties.
  • This bio-inspired approach enables the creation of advanced thermally controllable materials and filters.
  • The developed thermal switch has potential applications in selective solar irradiation filtering and efficient thermal management systems.