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Thermal Measurement Techniques in Analytical Microfluidic Devices

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Published on: June 3, 2015

Path-Dependent Thermal Metadevice beyond Janus Functionalities.

Yishu Su¹, Ying Li^2,3,4, Tianzhi Yang⁵

¹Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin, 150001, China.

Advanced Materials (Deerfield Beach, Fla.)

|December 11, 2020

Summary

This summary is machine-generated.

Researchers developed a novel thermal metadevice that goes beyond Janus characteristics. This path-dependent device exhibits three distinct thermal functions—cloaking, concentrating, and transparency—depending on heat flow direction.

Keywords:

Janus thermal metadevices rotational transformation successive 3D transformations trifunction thermal metamaterials

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Area of Science:

Metamaterials and Nanophotonics
Thermal Engineering
2D Materials

Background:

Janus metamaterials, metasurfaces, and monolayers are key in nanophotonics and 2D materials, introducing asymmetry for unique properties.
Achieving diffusive Janus devices is challenging due to the lack of polarization, spin, or electric field control in scalar diffusion systems like heat conduction.
Existing diffusive devices typically exhibit limited thermal functions, making multifunctional designs difficult.

Purpose of the Study:

To propose a novel path-dependent thermal metadevice capable of exhibiting multiple distinct thermal behaviors.
To demonstrate a thermal device that surpasses traditional Janus characteristics by offering directional control over thermal functions.
To explore a new paradigm for multifunctional metamaterial devices in thermal management and diffusion processes.

Main Methods:

Utilizing a rotation transformation mechanism of thermal conductivity to engineer anisotropic in-plane conduction.
Designing a path-dependent thermal metadevice that allows specific thermal behaviors to be assigned to different directions of heat flow.
Conducting a proof-of-concept experiment to validate the proposed trifunction thermal metamaterial device.

Main Results:

Successfully demonstrated a path-dependent thermal metadevice with three distinct thermal functions: cloaking, concentrating, and transparency.
The device exhibits these functions based on the direction of heat flow, showcasing unprecedented control.
Experimental validation confirmed the anisotropic in-plane conduction and the device's trifunction capabilities.

Conclusions:

The proposed path-dependent strategy enables the creation of multifunctional thermal metamaterial devices.
This approach offers a new dimension for designing devices with tunable thermal behaviors beyond conventional Janus characteristics.
The findings have implications for advanced thermal management and broader applications in diffusion processes.