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<p>Phase-change materials (PCMs) are proving to be a centre of attraction for the scientific community due to their ability to store thermal energy, thereby resolving the energy crisis issue. The present work is an attempt to investigate the shape stability and the thermal properties of octadecane/polypyrrole and octadecane/silica composite PCMs; consisting of different weight percentages of polypyrrole and silica, respectively. A direct melt-mixing route has been used to synthesise composite PCMs. X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, field emission scanning electron spectroscopy (FE-SEM), differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) have been used to investigate various properties of the prepared composites. In addition, a leakage test has been carried out for more than 500 thermal cycles at <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="12043_2025_2945_Article_IEq1.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="28" /> </InlineMediaObject> <EquationSource Format="TEX">\(45\,^{\circ }\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mn>45</mn> <mmultiscripts> <mspace width="0.166667em" /> <mrow /> <mo>∘</mo> </mmultiscripts> </mrow> </math></EquationSource> </InlineEquation>C, for 30 min per cycle in a hot air oven to investigate the shape stability of composite PCMs. The XRD pattern and FTIR spectra confirm the successful synthesis of composite PCMs without any chemical reaction between individual components. Octadecane/polypyrrole composite containing 20 wt% polypyrrole (OCT/PPY-2) shows less leakage than octadecane/silica composite PCM having 20 wt% silica OCT/SC-2 and confirms its better shape stability. OCT/PPY-2 shows higher latent heat of fusion than OCT/SC-2 composite with almost the same thermal stability. In conclusion, the OCT/PPY-2 composite performs better than the OCT/SC-2 composite and is a more suitable candidate for thermal energy storage in low-temperature thermal energy storage systems.</p>

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Comparative thermal study of octadecane-based shape-stable materials for thermal energy storage

  • 期刊论文

  • 发表日期：

    2025年6月19日

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  • PANKAJ SINGH RAWAT,
  • DEEPIKA P JOSHI,
  • NEETU BORA

摘要

Phase-change materials (PCMs) are proving to be a centre of attraction for the scientific community due to their ability to store thermal energy, thereby resolving the energy crisis issue. The present work is an attempt to investigate the shape stability and the thermal properties of octadecane/polypyrrole and octadecane/silica composite PCMs; consisting of different weight percentages of polypyrrole and silica, respectively. A direct melt-mixing route has been used to synthesise composite PCMs. X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, field emission scanning electron spectroscopy (FE-SEM), differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) have been used to investigate various properties of the prepared composites. In addition, a leakage test has been carried out for more than 500 thermal cycles at \(45\,^{\circ }\) 45 ∘ C, for 30 min per cycle in a hot air oven to investigate the shape stability of composite PCMs. The XRD pattern and FTIR spectra confirm the successful synthesis of composite PCMs without any chemical reaction between individual components. Octadecane/polypyrrole composite containing 20 wt% polypyrrole (OCT/PPY-2) shows less leakage than octadecane/silica composite PCM having 20 wt% silica OCT/SC-2 and confirms its better shape stability. OCT/PPY-2 shows higher latent heat of fusion than OCT/SC-2 composite with almost the same thermal stability. In conclusion, the OCT/PPY-2 composite performs better than the OCT/SC-2 composite and is a more suitable candidate for thermal energy storage in low-temperature thermal energy storage systems.