We wished to improve the thermophysical properties and thermal stability of meso-erythritol (ET) for storage of thermal energy. Hence, capsules containing ET with polysiloxane (pSiO) shells were fabricated using ultraviolet-assisted in situ polymerization, and the effects of encapsulation and additives doping on the thermophysical properties of ET were studied. Differential scanning calorimetry showed that the heat-release performance of the composite (pSiO-C-A@ET) upon addition of 3.0 wt. % carboxymethylcellulose (CMC) and 9.0 wt. % nano-α-Al2O3 increased significantly from 64.1% to 89.0%, and the supercooling degree decreased dramatically from 89.5 °C to 17.0 °C, compared with that of pure ET. Spectroscopy (Fourier transform-infrared, x-ray diffraction) implied no change in the crystal structure of ET after encapsulation by pSiO shells. Addition of a nucleation agent (nano-α-Al2O3) and thickening agent (CMC) had no effect on the crystal structure of pSiO-C-A@ET. The thermal conductivity of pSiO@ET and pSiO-C-A@ET capsules increased by 6.2% and 20.0% compared with that of pure ET (0.65 W/m·K) at 25 °C, respectively. The thermal conductivity was enhanced noticeably by doping with nano-α-Al2O3. Results from accelerated thermal cycling suggested that pSiO@ET and pSiO-C-A@ET capsules exhibited good thermal stability and thermal durability. These data suggest that composite phase-change materials could be employed for applications involving storage of thermal energy.

中文翻译：

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包封和添加剂掺杂对赤藓糖醇热能储存热物理性质的影响

我们希望提高内消旋赤藓糖醇 (ET) 的热物理性质和热稳定性，用于储存热能。因此，使用紫外线辅助原位聚合制备含有 ET 和聚硅氧烷 (pSiO) 壳的胶囊，并研究了封装和添加剂掺杂对 ET 热物理性能的影响。差示扫描量热法表明复合材料（pSiO-CA@ET）在添加 3.0 wt. % 羧甲基纤维素 (CMC) 和 9.0 wt. 与纯ET相比，%nano-α-Al2O3从64.1%显着增加到89.0%，过冷度从89.5℃显着降低到17.0℃。光谱学（傅里叶变换红外，X 射线衍射）表明在被 pSiO 壳封装后 ET 的晶体结构没有变化。添加成核剂（纳米-α-Al2O3）和增稠剂（CMC）对 pSiO-CA@ET 的晶体结构没有影响。与纯ET（0.65 W/m·K）相比，pSiO@ET和pSiO-CA@ET胶囊在25°C时的热导率分别提高了6.2%和20.0%。通过掺杂纳米-α-Al2O3 显着提高了热导率。加速热循环的结果表明 pSiO@ET 和 pSiO-CA@ET 胶囊表现出良好的热稳定性和热耐久性。这些数据表明复合相变材料可用于涉及热能储存的应用。0% 与 25 °C 下纯 ET (0.65 W/m·K) 相比。通过掺杂纳米-α-Al2O3 显着提高了热导率。加速热循环的结果表明 pSiO@ET 和 pSiO-CA@ET 胶囊表现出良好的热稳定性和热耐久性。这些数据表明复合相变材料可用于涉及热能储存的应用。0% 与 25 °C 下纯 ET (0.65 W/m·K) 相比。通过掺杂纳米-α-Al2O3 显着提高了热导率。加速热循环的结果表明 pSiO@ET 和 pSiO-CA@ET 胶囊表现出良好的热稳定性和热耐久性。这些数据表明复合相变材料可用于涉及热能储存的应用。