The packaging capability and thermal conductivity of medium- and high-temperature shape-stabilized composite phase change materials (ss-CPCMs) should be further improved to achieve more excellent properties by encapsulating them into a more promising encapsulation material. Porous TiO₂ foam (PTF) with a unique three-dimensional interconnected adjustable porous structure was prepared by a particle-stabilized emulsion method, which was used as the package carrier material to overcome the leakage problem and low conductivity of phase change materials (PCMs). LiNO₃ and Na₂SO₄ were selected as the medium- and high-temperature PCMs, respectively, and two kinds of novelty ss-CPCMs were fabricated by impregnation under medium- and high-temperature environments. Scanning electron microscopy results showed that the PCMs were evenly distributed into the pores of PTF, and the excellent chemical compatibility between PCMs and PTF was confirmed by X-ray diffraction and Fourier transform infrared tests. Moreover, differential scanning calorimetry tests showed that the latent heat of LiNO₃–PTF and Na₂SO₄–PTF ss-CPCMs was 264.1 and 102.3 J g^–1, which indicated that ss-CPCMs had excellent heat storage performance and adapted the demand of the medium- and high-temperature application. The thermal conductivities of LiNO₃–PTF and Na₂SO₄–PTF ss-CPCMs were 2.80 and 1.69 W m^–1 K^–1, which increased by 100 and 50%, respectively. Thermogravimetric analysis showed the excellent thermal stability of ss-CPCMs within the different application temperature ranges. Hence, PTF was a promising carrier material for medium- and high-temperature thermal energy storage.

中文翻译：

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多孔二氧化钛泡沫：一种用于中高温储热的有希望的载体材料

通过将中型和高温形状稳定的复合相变材料（ss-CPCM）封装到更有前景的封装材料中，应进一步提高其包装性能和导热性，以实现更优异的性能。通过颗粒稳定乳液法制备了具有独特的三维互连可调多孔结构的多孔TiO ₂泡沫（PTF），该泡沫TiO ₂泡沫被用作包装载体材料以克服相变材料（PCM）的泄漏问题和低电导率。LiNO ₃和Na ₂ SO ₄分别选择了中高温PCM，并通过在高温和高温环境下浸渍制备了两种新颖的ss-CPCM。扫描电子显微镜结果表明，PCM均匀分布在PTF的孔中，通过X射线衍射和傅里叶变换红外测试证实了PCM与PTF之间的优异化学相容性。此外，差示扫描量热法测试表明，LiNO ₃ -PTF和Na ₂ SO ₄ -PTF ss-CPCMs的潜热分别为264.1和102.3 J g ^–1，这表明ss-CPCMs具有出色的储热性能并适应了需求中高温应用。LiNO的热导率₃ –PTF和Na ₂ SO ₄ –PTF ss-CPCM分别为2.80和1.69 W m ^–1 K ^–1，分别增加了100％和50％。热重分析表明，在不同的应用温度范围内，ss-CPCM具有出色的热稳定性。因此，PTF是用于中高温储热的有前途的载体材料。