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Preparation and investigation of distinct and shape stable paraffin/SiO_2 composite PCM nanospheres

机译：独特且形状稳定的石蜡/ SiO_2复合PCM纳米球的制备与研究

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摘要

The synthesis of a shape stable paraffin/SiO2 composite PCM, for use in latent heat storage, comprised of distinct nanospheres, using a novel and simple chemically aided infiltration method was investigated and the produced samples were characterized. SiO2 spheres were synthesized, with the sol-gel method, and then used to encapsulate paraffin wax using several different preparation ratios of paraffin to SiO2. The samples' constitution and morphology were characterized by FT-IR spectroscopy and scanning electron microscopy (SEM) respectively. Thermogravimetric analysis (TGA) was used for the paraffin mass percentage determination. The results were indicative of paraffin encapsulation inside the porous network of the SiO2 spheres. DSC was used to investigate the thermophysical properties of the composite samples and for their evaluation as PCMs. The sample with the highest encapsulation ratio (B4 at 78.15%) had a paraffin mass percentage of 80% and a latent heat of similar to 156 J/g. The encapsulation's influence on paraffin's thermal properties was investigated and an optimum preparation ratio was determined. The composite nanoparticles retained a large amount of the paraffin's latent heat while showing no signs of aggregation-a novelty for paraffin/SiO2 nanoPCM- and presenting enhancements that make them promising materials for heat storage applications (LHTES).
机译：研究了一种新颖的，简单的化学辅助渗透法合成的形状稳定的石蜡/ SiO2复合PCM，用于潜热存储，由不同的纳米球组成，并对其进行了化学表征。用溶胶-凝胶法合成了SiO2球，然后使用几种不同的石蜡与SiO2的制备比例将其包封在石蜡中。分别通过FT-IR光谱和扫描电镜（SEM）表征样品的组成和形态。热重分析（TGA）用于石蜡质量百分比测定。结果表明石蜡包封在SiO2球的多孔网络内部。 DSC用于研究复合样品的热物理性质，并作为PCM进行评估。包封率最高的样品（B4为78.15％）的石蜡质量百分比为80％，潜热约为156 J / g。研究了包封对石蜡热性能的影响，并确定了最佳的制备比例。复合纳米颗粒保留了大量石蜡的潜热，同时没有聚集的迹象（石蜡/ SiO2纳米PCM的新颖性），并且具有增强的特性，使其成为有前途的储热材料（LHTES）。

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