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Related Experiment Video

Updated: Nov 7, 2025

TiO2-coated Hollow Glass Microspheres with Superhydrophobic and High IR-reflective Properties Synthesized by a Soft-chemistry Method

TiO2-coated Hollow Glass Microspheres with Superhydrophobic and High IR-reflective Properties Synthesized by a Soft-chemistry Method

Published on: April 26, 2017

Passive Smart Thermal Control Coatings Incorporating CaF₂/VO₂ Core-Shell Microsphere Structures.

Xueyu Wu¹, Le Yuan², Xiaolong Weng¹

¹National Engineering Research Center of Electromagnetic Radiation Control Materials, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China.

|April 29, 2021

Summary

Researchers developed a new smart thermal control coating using calcium fluoride/vanadium dioxide (CaF2@VO2) microspheres. This coating exhibits a reversible increase in emissivity with temperature, offering a power-free solution for thermal management.

Keywords:

VO2 coating core−shell structure positive emissivity behavior smart thermal control

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Last Updated: Nov 7, 2025

TiO2-coated Hollow Glass Microspheres with Superhydrophobic and High IR-reflective Properties Synthesized by a Soft-chemistry Method

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Surface Functionalization of Metal-Organic Frameworks for Improved Moisture Resistance

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Published on: September 5, 2018

Area of Science:

Materials Science
Nanotechnology
Thermal Engineering

Background:

Existing smart radiation devices have limitations like bulkiness and power demands.
Need for advanced materials for efficient thermal management.

Purpose of the Study:

To develop a smart thermal control coating overcoming limitations of current devices.
To utilize the temperature-dependent properties of VO2 for tunable emissivity.

Main Methods:

Fabrication of CaF2/VO2 core-shell microspheres using a solvent/hydrothermal-calcination method.
Incorporation of microspheres into a polymer matrix for easy application.
Investigation of optical and thermal properties through experimental analysis and simulations.

Main Results:

Achieved a significant, reversible increase in emissivity from 0.47 at 30°C to 0.83 at 90°C.
Demonstrated the tunable optical scattering and absorption properties of CaF2@VO2 microspheres.
Validated the underlying mechanisms through theoretical analysis and numerical simulations.

Conclusions:

The CaF2@VO2 core-shell microsphere coating offers a promising, power-free solution for smart thermal control.
This technology can advance the development of novel coating materials for dynamic thermal management applications.
The study provides a foundation for further research into advanced radiative cooling and heating materials.