Janus particles stabilized asymmetric porous composites for thermal rectification

Area of Science:

• Materials Science
• Nanotechnology
• Additive Manufacturing

Background:

• Thermal rectification, the directional transfer of heat in asymmetric materials, is crucial for thermal management.
• Designing complex asymmetric structures for thermal rectification presents significant fabrication challenges.

Purpose of the Study:

• To propose a novel additive manufacturing method for fabricating asymmetric porous composites with tunable thermal rectification.
• To investigate the thermal rectification properties of these novel materials.

Main Methods:

• Utilizing layer-by-layer cast emulsions stabilized with Janus particles (JPs) to create asymmetric porous composites (JAPCs).
• Employing experimental and simulation approaches to analyze the thermal rectification performance of JAPCs.
• Investigating the effect of layer contrast on thermal rectification ratios.

Main Results:

• Achieved stable emulsions allowing independent layer manipulation and significant structural asymmetry.
• Demonstrated tunable thermal rectification ratios in JAPCs, reaching a maximum of 38%.
• Successfully fabricated multilayer alternating porous composites, overcoming limitations of gradient asymmetric approaches.

Conclusions:

• The emulsion casting additive manufacturing method offers a practical route for fabricating complex asymmetric porous structures.
• JAPCs show potential for regulating thermal energy in fluctuating ambient conditions.
• This method is scalable for large-scale production and applicable in advanced additive manufacturing.