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Robust and Eco-Friendly Waterborne Phase-Change Composite Protective Coatings Containing Paraffin-Loaded SiO2/Fe3O4 Hybrid Wall Microcapsules and Their Application in Long-Term Effective Temperature Regulation of the Protected Substrate

  • 0State Key Laboratory of High Performance Civil Engineering Materials, Jiangsu Sobute New Materials Co. Ltd., Nanjing 211103, P. R. China.
Langmuir : the Acs Journal of Surfaces and Colloids +

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March 27, 2025

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March 27, 2025

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Summary

This summary is machine-generated.

Researchers developed novel SiO<sub>2</sub>/Fe<sub>3</sub>O<sub>4</sub> hybrid microcapsules for enhanced thermal energy storage. These microcapsules, containing a paraffin core, demonstrated improved thermal properties and stability, offering potential for advanced protective coatings.

Area Of Science

  • Materials Science
  • Nanotechnology
  • Chemical Engineering

Background

  • Development of advanced phase-change materials (PCMs) is crucial for efficient thermal energy storage.
  • Microencapsulation is a key technique to stabilize PCMs and improve their thermal properties.
  • Incorporation of magnetic nanoparticles can enhance thermal conductivity and provide additional functionalities.

Purpose Of The Study

  • To fabricate SiO<sub>2</sub>/Fe<sub>3</sub>O<sub>4</sub> hybrid wall microcapsules with a paraffin core using Pickering emulsion and sol-gel methods.
  • To investigate the effect of Fe<sub>3</sub>O<sub>4</sub> nanoparticle dosage on the microcapsules' morphology and thermal performance.
  • To evaluate the thermoregulatory performance of these microcapsules when incorporated into water-based acrylic resin paint for protective coatings.

Main Methods

  • Fabrication of SiO<sub>2</sub>/Fe<sub>3</sub>O<sub>4</sub> hybrid wall microcapsules via Pickering emulsion template self-assembly and sol-gel techniques.
  • Characterization of microcapsule morphology and surface properties.
  • Thermal analysis (DSC, TGA) to determine encapsulation efficiency, energy storage efficiency, and thermal conductivity.
  • Assessment of thermal cycling stability.
  • Preparation and testing of phase-change composite protective coatings (PCCPCs).

Main Results

  • Successfully synthesized spherical SiO<sub>2</sub>/Fe<sub>3</sub>O<sub>4</sub> hybrid microcapsules with rougher surfaces compared to pure SiO<sub>2</sub> microcapsules.
  • Microcapsules prepared with 0.01 mol/L Fe<sub>3</sub>O<sub>4</sub> Pickering emulsion (Pa@SiO<sub>2</sub>/Fe<sub>3</sub>O<sub>4</sub>-Ms) showed significant improvements: 16.71% higher encapsulation efficiency, 16.88% higher energy storage efficiency, and 28.4% increased thermal conductivity compared to Pa@SiO<sub>2</sub>-Ms.
  • The Pa@SiO<sub>2</sub>/Fe<sub>3</sub>O<sub>4</sub>-Ms (0.01) exhibited excellent thermal stability, with minimal changes in phase-change temperature and enthalpy after 300 thermal cycles.
  • PCCPCs incorporating 5 wt% Pa@SiO<sub>2</sub>/Fe<sub>3</sub>O<sub>4</sub>-Ms (0.01) demonstrated superior thermoregulation, increasing real-time temperature difference by 4.6 °C and reducing temperature ramp rate by 2.45 °C/min.
  • These PCCPCs also showed reduced temperature fluctuation amplitude (3.8 °C) and extended fluctuation frequency (395 s) under heating/cooling cycles compared to pure coatings.

Conclusions

  • The fabricated SiO<sub>2</sub>/Fe<sub>3</sub>O<sub>4</sub> hybrid microcapsules effectively encapsulate paraffin and enhance thermal energy storage properties.
  • The inclusion of Fe<sub>3</sub>O<sub>4</sub> nanoparticles significantly boosts thermal conductivity and overall thermal performance.
  • The developed phase-change composite protective coatings exhibit excellent thermoregulatory capabilities, offering potential for protecting concrete substrates from thermal stress.

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