Robust and Eco-Friendly Waterborne Phase-Change Composite Protective Coatings Containing Paraffin-Loaded SiO<sub>2</sub>/Fe<sub>3</sub>O<sub>4</sub> Hybrid Wall Microcapsules and Their Application in Long-Term Effective Temperature Regulation of the

SiO<sub>2</sub>/Fe<sub>3</sub>O<sub>4</sub> hybrid wall microcapsules containing a paraffin core were successfully fabricated by Pickering emulsion template self-assembly and sol-gel technologies. The walls of these microcapsules were embedded with different dosages of Fe<sub>3</sub>O<sub>4</sub> nanoparticles due to the effect of Fe<sub>3</sub>O<sub>4</sub> Pickering emulsion of different concentrations. The resultant microcapsules exhibited a regular spherical morphology and a rough outer surface compared with that of the SiO<sub>2</sub> wall. Thermal analysis indicated that the encapsulation efficiency (<i>E</i><sub>en</sub>), thermal energy-storage efficiency (<i>E</i><sub>es</sub>), and thermal conductivity of paraffin@SiO<sub>2</sub>/Fe<sub>3</sub>O<sub>4</sub> hybrid wall 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 (0.01)] increased by 16.71%, 16.88%, and 28.4% compared with those of paraffin@SiO<sub>2</sub> microcapsules (Pa@SiO<sub>2</sub>-Ms), respectively. The phase-change temperatures and enthalpy of Pa@SiO<sub>2</sub>/Fe<sub>3</sub>O<sub>4</sub>-Ms (0.01) with an 80-100 μm particle size range changed little after 300 thermal cycles. At the same time, these microcapsules were introduced into water-based acrylic resin paint to prepare phase-change composite protective coatings (PCCPCs) and exhibited excellent thermoregulatory performance. The real-time temperature difference and temperature ramp rate of PCCPCs incorporating 5 wt % (80-100 μm) Pa@SiO<sub>2</sub>/Fe<sub>3</sub>O<sub>4</sub>-Ms (0.01) increased by 4.6 °C and decreased by 2.45 °C/min compared to that of the pure coating, respectively. Meanwhile, the fluctuation amplitude and fluctuation frequency of the average temperature on the back side of 5 wt % (80-100 μm) Pa@SiO<sub>2</sub>/Fe<sub>3</sub>O<sub>4</sub>-Ms (0.01)-PCCPCs decreased by 3.8 °C and extended by 395 s compared to that of the pure coating under one heating and cooling cycle, respectively. This study will provide great potential applications for addressing the risk of shrinkage deformation and cracking of the protected concrete substrates under high-frequency and large temperature difference conditions.

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Publication Details

Journal
Langmuir
Published
2025-03-27
DOI
https://doi.org/10.1021/acs.langmuir.5c00236
Primary Topic
Phase Change Materials Research
Type
article
Field-Weighted Citation Impact
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article

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

Qianping Ran, Baolei Liu, Dongfang Wang, Yabin Ma et al.
Langmuir
Phase Change Materials Research
article

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

Qianping Ran, Baolei Liu, Dongfang Wang, Yabin Ma, Dewen Sun, Yingjie Ma
article en

Abstract

SiO<sub>2</sub>/Fe<sub>3</sub>O<sub>4</sub> hybrid wall microcapsules containing a paraffin core were successfully fabricated by Pickering emulsion template self-assembly and sol-gel technologies. The walls of these microcapsules were embedded with different dosages of Fe<sub>3</sub>O<sub>4</sub> nanoparticles due to the effect of Fe<sub>3</sub>O<sub>4</sub> Pickering emulsion of different concentrations. The resultant microcapsules exhibited a regular spherical morphology and a rough outer surface compared with that of the SiO<sub>2</sub> wall. Thermal analysis indicated that the encapsulation efficiency (<i>E</i><sub>en</sub>), thermal energy-storage efficiency (<i>E</i><sub>es</sub>), and thermal conductivity of paraffin@SiO<sub>2</sub>/Fe<sub>3</sub>O<sub>4</sub> hybrid wall 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 (0.01)] increased by 16.71%, 16.88%, and 28.4% compared with those of paraffin@SiO<sub>2</sub> microcapsules (Pa@SiO<sub>2</sub>-Ms), respectively. The phase-change temperatures and enthalpy of Pa@SiO<sub>2</sub>/Fe<sub>3</sub>O<sub>4</sub>-Ms (0.01) with an 80-100 μm particle size range changed little after 300 thermal cycles. At the same time, these microcapsules were introduced into water-based acrylic resin paint to prepare phase-change composite protective coatings (PCCPCs) and exhibited excellent thermoregulatory performance. The real-time temperature difference and temperature ramp rate of PCCPCs incorporating 5 wt % (80-100 μm) Pa@SiO<sub>2</sub>/Fe<sub>3</sub>O<sub>4</sub>-Ms (0.01) increased by 4.6 °C and decreased by 2.45 °C/min compared to that of the pure coating, respectively. Meanwhile, the fluctuation amplitude and fluctuation frequency of the average temperature on the back side of 5 wt % (80-100 μm) Pa@SiO<sub>2</sub>/Fe<sub>3</sub>O<sub>4</sub>-Ms (0.01)-PCCPCs decreased by 3.8 °C and extended by 395 s compared to that of the pure coating under one heating and cooling cycle, respectively. This study will provide great potential applications for addressing the risk of shrinkage deformation and cracking of the protected concrete substrates under high-frequency and large temperature difference conditions.

LangmuirVol. 41(13)
China National Building Materials Group (China) (CN), Institute of New Materials (CN), State Key Laboratory of High Performance Civil Engineering Materials
National Key Research and Development Program of China
Clean water and sanitation
Openalex Percentile: Top 95%
Phase Change Materials Research
DOISourceOpenAlex
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