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Related Experiment Video

Updated: Jun 9, 2026

TiO2-coated Hollow Glass Microspheres with Superhydrophobic and High IR-reflective Properties Synthesized by a Soft-chemistry Method
07:37

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

Published on: April 26, 2017

Highly Efficient NIR-Reflective CrAl2O4‑Based Polymer Microcapsules for Advanced Thermal Management Coatings.

Jittipat Omsinsombon1, Amorn Chaiyasat1,2, Chumphol Busabok3

  • 1Department of Chemistry, Faculty of Science and Technology, Rajamangala University of Technology Thanyaburi, Pathum Thani 12110, Thailand.

ACS Omega
|June 8, 2026
PubMed
Summary

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Langmuir : the ACS journal of surfaces and colloids·2020

Novel chromium aluminum oxide (CrAl2O4) particles were encapsulated into polymer microcapsules. These microcapsules effectively reflect near-infrared (NIR) light, significantly reducing surface temperatures for energy-efficient coatings.

Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Near-infrared (NIR)-reflective materials are crucial for mitigating solar heat gain in various applications.
  • Developing efficient NIR-reflective pigments that are compatible with polymer matrices is an ongoing challenge.

Purpose of the Study:

  • To investigate chromium aluminum oxide (CrAl2O4) spinel particles as a novel NIR-reflective pigment.
  • To develop polymer microcapsules containing CrAl2O4 particles for enhanced NIR reflectance and coating performance.
  • To evaluate the impact of monomer composition and pigment loading on microcapsule properties and coating effectiveness.

Main Methods:

  • Synthesis and characterization of CrAl2O4 particles.
  • Surface modification of CrAl2O4 particles with 3-methacryloxypropyl trimethoxysilane (MPS).

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Last Updated: Jun 9, 2026

TiO2-coated Hollow Glass Microspheres with Superhydrophobic and High IR-reflective Properties Synthesized by a Soft-chemistry Method
07:37

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Published on: April 26, 2017

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  • Encapsulation of MPS-CrAl2O4 particles into polymer microcapsules via UV-initiated microsuspension polymerization.
  • Analysis of microcapsule morphology, thermal behavior, NIR reflectance, and coating performance.

    • Main Results:

    • CrAl2O4 particles exhibited high NIR reflectance.
    • MPS modification improved particle dispersion in the polymer matrix.
    • Microcapsules with a MMA:BA:EGDMA ratio of 50:40:10 showed good stability and spherical morphology.
    • NIR reflectance reached 87% with 40 wt% MPS-CrAl2O4 loading.
    • Coatings demonstrated a significant reduction in interior temperature (up to 16 °C).

    Conclusions:

    • Polymer-encapsulated CrAl2O4 particles retain excellent NIR-reflective properties.
    • The developed microcapsules offer a viable solution for creating energy-efficient coatings with reduced solar heat gain.
    • The encapsulation strategy enhances pigment compatibility and performance in coating applications.