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Preparation, characterization and permeation kinetics description of calcium alginate macro-capsules containing shape-stabilize phase change materials

Author

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  • Wang, Jian-Ping
  • Zhang, Xing-Xiang
  • Wang, Xue-Chen

Abstract

Macro-capsules containing shape-stabilize phase change materials (SSPCM) which have 50 wt% of n-octadecane (OD) and 50 wt% of high-density polyethylene (HDPE) were prepared by using a traditional coating pan with calcium alginate (CA) as the shell material. The surface morphologies and construction, wall permeability and the kinetic release parameters of OD in a solvent of petroleum ether along with the thermal properties of the materials were investigated using a scanning electron microscope (SEM), thermal cycles, the extraction release kinetics, and differential scanning calorimeters (DSC), respectively. The results show the wall thickness of the macro-capsules was about 30–50 μm under the experimental conditions. The surface of the SSPCM after the application of chromic acid is rough and littered with numerous, microscopic holes measuring about 3 μm in diameter. From this one may conclude that either the hydrophilicity of the SSPCM surface or the permeability of the prepared macro-capsules was altered during the process and thus differed from the unmodified samples. In addition to this, the weight loss percentage (WLP) of the macro-capsules was approximately 1.5 times in the unmodified capsules, and 3 times in the modified SSPCM. The addition of the plasticizer glycerin into the wall significantly decreased the impermeability of the macro-capsules. From the parameters of the Power exponent, there are two different release mechanisms, Fickian/quasi-Fickian diffusion and anomalous transport for modified and unmodified SSPCM.

Suggested Citation

  • Wang, Jian-Ping & Zhang, Xing-Xiang & Wang, Xue-Chen, 2011. "Preparation, characterization and permeation kinetics description of calcium alginate macro-capsules containing shape-stabilize phase change materials," Renewable Energy, Elsevier, vol. 36(11), pages 2984-2991.
    • Handle: RePEc:eee:renene:v:36:y:2011:i:11:p:2984-2991
    DOI: 10.1016/j.renene.2011.03.039
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    Cited by:

    1. Li, Wei & Zhang, Rong & Jiang, Nan & Tang, Xiao-fen & Shi, Hai-feng & Zhang, Xing-xiang & Zhang, Yuankai & Dong, Lin & Zhang, Ningxin, 2013. "Composite macrocapsule of phase change materials/expanded graphite for thermal energy storage," Energy, Elsevier, vol. 57(C), pages 607-614.
    2. Rao, Zhonghao & Wang, Shuangfeng & Peng, Feifei, 2012. "Self diffusion of the nano-encapsulated phase change materials: A molecular dynamics study," Applied Energy, Elsevier, vol. 100(C), pages 303-308.
    3. Zhang, Xialan & Lin, Qilang & Luo, Huijun & Luo, Shiyuan, 2020. "Three-dimensional graphitic hierarchical porous carbon/stearic acid composite as shape-stabilized phase change material for thermal energy storage," Applied Energy, Elsevier, vol. 260(C).

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