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- W2991072105 abstract "Metallic solid-liquid phase change materials (SLPCMs) are crucial for the thermal energy storage technology of various industrial systems. However, the encapsulation of metallic SLPCMs is still technically difficult. In this pursuit, the present research envisaged the development of a novel technology to successfully prepare the core(=Al-Si/Bi)/void/shell(=Al2O3) composite SLPCMs by using Al/Bi immiscible alloy powders as starting material and tetraethoxysilane as SiO2 source. The Al-Si alloy and Al2O3 shell were in-situ synthesized by the displacement reaction between SiO2 and molten Al. Interestingly, most of the Bi distributed in the shell of Al/Bi immiscible alloy powders could not only improve the activity of alloy powders and promote the formation of precursor shell, but also be recycled by evaporation to form the void layer during the calcination process of composite SLPCMs. The produced void layer provided a space buffer to alleviate the volume expansion of the core SLPCM, and thereby improving the thermal cycling stability of the prepared composite SLPCMs. The thermal cycling test results showed that after 300 thermal cycles, the melting latent heat reduction of the core(=Al-Si/Bi)/void/shell(=Al2O3) composite SLPCMs (24.3–31.7 J/g) was much less than that of the core(=Al-Si)/shell(=Al2O3) composite SLPCM (58.1 J/g). Moreover, the prepared Al-Si/Bi/Al2O3 exhibited an adjustable melting temperature (571.9 °C to 631.9 °C) and average particle diameter (39.3 μm to 112.6 μm), relatively high thermal conductivity [2.068 W(mK)−1 to 2.966 W(mK)−1], and excellent thermal energy storage capacity (209.5 J/g to 278.2 J/g). Thus, the prepared Al-Si/Bi/Al2O3 composite SLPCMs are potential thermal energy storage materials, which can be used to improve the energy efficiency of various industrial systems." @default.
- W2991072105 created "2019-12-05" @default.
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- W2991072105 date "2020-07-01" @default.
- W2991072105 modified "2023-09-26" @default.
- W2991072105 title "Novel core/void/shell composite phase change materials for high temperature thermal energy storage" @default.
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- W2991072105 doi "https://doi.org/10.1016/j.cej.2019.123539" @default.
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