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An organic-inorganic hybrid microcapsule of phase change materials for thermal energy storage in cementitious composites
https://orcid.org/0000-0002-4206-9036
https://orcid.org/0000-0003-2176-9305
Abstract Phase change materials (PCMs) provide passive storage of thermal energy in buildings to flatten heating and cooling load profiles and minimize peak energy demands. They are commonly microencapsulated in a protective shell to enhance thermal transfer due to their much larger surface-area-to-volume ratio. The protective shell also enables the direct addition of PCMs to cementitious materials for thermal energy storage. Existing studies in the literature show that the mechanical properties of cementitious materials can be drastically reduced by their incorporation with PCM microcapsules. To address this issue, this study introduced a novel hybrid shell for the PCM microcapsule, which is composed of cenospheres and ethyl cellulose (EC). This new hybrid shell harnesses the advantages of both the inorganic and organic shells: high strength, thermal conductivity, and lower permeability. The produced PCM microcapsule with this hybrid shell, referred to as ECPCM, was thoroughly characterized with scanning electron microscopy (SEM), differential scanning calorimetry (DSC), Fourier-transform infrared spectroscopy (FTIR), and thermogravimetric analysis (TGA). The effect of the microcapsules on cement hydration, thermal and mechanical properties of cementitious composites were also studied. The result showed that the EC coating successfully prevented leakage of the PCM from the microcapsule and enhanced its thermal stability. The incorporation of ECPCM into cementitious materials significantly increased their thermal energy storage capacity, as evidenced by the reduced temperature change rate and the maximum temperature of the material incorporated with the ECPCM. The salient feature of this hybrid shell in retaining the compressive strength of the cement mortar was also validated by the experimental study. Although the strength of the mortar was reduced by adding ECPCM, this reduction is much smaller than those reported in the literature using other PCM microcapsules. This indicates the great potential of this new microcapsule shell for use in structural materials, enabling thermal energy storage without significantly compromising their structural integrity.
Highlights A novel inorganic-organic hybrid PCM microcapsule is developed. The new microcapsule harnesses the benefits of both inorganic and organic microcapsules. Thermal stability of the PCM is enhanced by the proposed microcapsule. Cement mortar with large volumes of the PCM microcapsules preserves structural strength.
An organic-inorganic hybrid microcapsule of phase change materials for thermal energy storage in cementitious composites
https://orcid.org/0000-0002-4206-9036
https://orcid.org/0000-0003-2176-9305
Abstract Phase change materials (PCMs) provide passive storage of thermal energy in buildings to flatten heating and cooling load profiles and minimize peak energy demands. They are commonly microencapsulated in a protective shell to enhance thermal transfer due to their much larger surface-area-to-volume ratio. The protective shell also enables the direct addition of PCMs to cementitious materials for thermal energy storage. Existing studies in the literature show that the mechanical properties of cementitious materials can be drastically reduced by their incorporation with PCM microcapsules. To address this issue, this study introduced a novel hybrid shell for the PCM microcapsule, which is composed of cenospheres and ethyl cellulose (EC). This new hybrid shell harnesses the advantages of both the inorganic and organic shells: high strength, thermal conductivity, and lower permeability. The produced PCM microcapsule with this hybrid shell, referred to as ECPCM, was thoroughly characterized with scanning electron microscopy (SEM), differential scanning calorimetry (DSC), Fourier-transform infrared spectroscopy (FTIR), and thermogravimetric analysis (TGA). The effect of the microcapsules on cement hydration, thermal and mechanical properties of cementitious composites were also studied. The result showed that the EC coating successfully prevented leakage of the PCM from the microcapsule and enhanced its thermal stability. The incorporation of ECPCM into cementitious materials significantly increased their thermal energy storage capacity, as evidenced by the reduced temperature change rate and the maximum temperature of the material incorporated with the ECPCM. The salient feature of this hybrid shell in retaining the compressive strength of the cement mortar was also validated by the experimental study. Although the strength of the mortar was reduced by adding ECPCM, this reduction is much smaller than those reported in the literature using other PCM microcapsules. This indicates the great potential of this new microcapsule shell for use in structural materials, enabling thermal energy storage without significantly compromising their structural integrity.
Highlights A novel inorganic-organic hybrid PCM microcapsule is developed. The new microcapsule harnesses the benefits of both inorganic and organic microcapsules. Thermal stability of the PCM is enhanced by the proposed microcapsule. Cement mortar with large volumes of the PCM microcapsules preserves structural strength.
An organic-inorganic hybrid microcapsule of phase change materials for thermal energy storage in cementitious composites
https://orcid.org/0000-0002-4206-9036
https://orcid.org/0000-0003-2176-9305
Abstract Phase change materials (PCMs) provide passive storage of thermal energy in buildings to flatten heating and cooling load profiles and minimize peak energy demands. They are commonly microencapsulated in a protective shell to enhance thermal transfer due to their much larger surface-area-to-volume ratio. The protective shell also enables the direct addition of PCMs to cementitious materials for thermal energy storage. Existing studies in the literature show that the mechanical properties of cementitious materials can be drastically reduced by their incorporation with PCM microcapsules. To address this issue, this study introduced a novel hybrid shell for the PCM microcapsule, which is composed of cenospheres and ethyl cellulose (EC). This new hybrid shell harnesses the advantages of both the inorganic and organic shells: high strength, thermal conductivity, and lower permeability. The produced PCM microcapsule with this hybrid shell, referred to as ECPCM, was thoroughly characterized with scanning electron microscopy (SEM), differential scanning calorimetry (DSC), Fourier-transform infrared spectroscopy (FTIR), and thermogravimetric analysis (TGA). The effect of the microcapsules on cement hydration, thermal and mechanical properties of cementitious composites were also studied. The result showed that the EC coating successfully prevented leakage of the PCM from the microcapsule and enhanced its thermal stability. The incorporation of ECPCM into cementitious materials significantly increased their thermal energy storage capacity, as evidenced by the reduced temperature change rate and the maximum temperature of the material incorporated with the ECPCM. The salient feature of this hybrid shell in retaining the compressive strength of the cement mortar was also validated by the experimental study. Although the strength of the mortar was reduced by adding ECPCM, this reduction is much smaller than those reported in the literature using other PCM microcapsules. This indicates the great potential of this new microcapsule shell for use in structural materials, enabling thermal energy storage without significantly compromising their structural integrity.
Highlights A novel inorganic-organic hybrid PCM microcapsule is developed. The new microcapsule harnesses the benefits of both inorganic and organic microcapsules. Thermal stability of the PCM is enhanced by the proposed microcapsule. Cement mortar with large volumes of the PCM microcapsules preserves structural strength.
An organic-inorganic hybrid microcapsule of phase change materials for thermal energy storage in cementitious composites
Ismail, Abdulmalik (author) / Bahmani, Maysam (author) / Chen, Xi (author) / Wang, Jialai (author)
2024-01-30
Article (Journal)
Electronic Resource
English
Phase change energy storage inorganic microcapsule material and preparation method thereof
| European Patent Office | 2021