Effect of core-shell ratio on the thermal energy storage capacity of SiO2 encapsulated lauric acid
Effect of core-shell ratio on the thermal energy storage capacity of SiO2 encapsulated lauric acid
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DOI：
10.1016/j.est.2021.103029
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发表时间：
2021-08-06
影响因子：
9.4
通讯作者：
Singh, Jitendra Kumar
中科院分区：
文献类型：
--
作者：
Ishak, Shafiq;Mandal, Soumen;Singh, Jitendra Kumar
以环境友好的脂肪酸月桂酸（LA）为相变材料，正硅酸乙酯（TEOS）为SiO2前驱体，采用溶胶-凝胶法制备SiO2。在本研究中，采用不同的核壳比与二氧化硅的微胶囊化LA。采用傅里叶变换红外光谱（FT-IR）、X射线衍射（XRD）、X射线光电子能谱（XPS）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、差示扫描量热法（DSC）和热重分析（TGA）等技术研究了不同核壳比对复合材料的化学、结构和热性能的影响。FT-IR、XRD、XPS、SEM和TEM结果证实了以SiO2为壳层的微胶囊化LA的正确性，DSC和TGA结果表明微胶囊化LA具有良好的热稳定性。核壳比对二氧化硅微胶囊化LA起着至关重要的作用，从而影响到胶囊化PCM的整体性能和结构。具有最高核壳比的PCM，即，LATEOS 6具有最高的封装率（92.39%），封装效率（93.48%）以及优异的热可靠性，即使在30次加热和冷却循环后。这些结果表明，微胶囊LA将是一个很有前途的材料，热能储存以及建筑材料（CBMs），以解决大体积混凝土问题。
Lauric acid (LA), an eco-friendly fatty acid, is used as phase change materials (PCMs) and tetraethyl orthosilicate (TEOS) as the precursor solution of SiO2 for sol-gel process. In the present study, various core-shell ratios are taken for the microencapsulation of LA with SiO2. The effect of different core-shell ratios on the chemical, structural, and thermal properties are studied by different techniques such as Fourier transform-infrared spectroscope (FT-IR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA). FT-IR, XRD, XPS, SEM, and TEM results confirmed the proper microencapsulation of LA with SiO2 shell while DSC and TGA revealed about excellent thermal stability of the microencapsulated LA. Core-shell ratios played a vital role on the microencapsulation of LA with SiO2 which affected the overall performance and structure of the encapsulated PCMs. PCMs with the highest core-shell ratio i.e., LATEOS6, exhibited the highest encapsulation ratio (92.39%), encapsulation efficiency (93.48%) as well as excellent thermal reliability even after 30 cycles of heating and cooling. These results suggested that microencapsulated LA would be a promising material for thermal energy storage as well as construction building materials (CBMs) to solve mass concrete problems.