Abstract
Lauric acid (LA) has been recommended as economic, eco-friendly, and commercially viable materials to be used as phase change materials (PCMs). Nevertheless, there is lack of optimized parameters to produce microencapsulated PCMs with good performance. In this study, different amounts of LA have been chosen as core materials while tetraethyl orthosilicate (TEOS) as the precursor solution to form silicon dioxide (SiO2) shell. The pH of precursor solution was kept at 2.5 for all composition of microencapsulated LA. The synthesized microencapsulated LA/SiO2 has been characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), X-Ray photoelectron spectroscopy (XPS), Scanning electron microscopy (SEM), and Transmission electron microscopy (TEM). The SEM and TEM confirm the microencapsulation of LA with SiO2. Thermogravimetric analysis (TGA) revealed better thermal stability of microencapsulated LA/SiO2 compared to pure LA. PCM with 50% LA i.e. LAPC-6 exhibited the highest encapsulation efficiency (96.50%) and encapsulation ratio (96.15%) through Differential scanning calorimetry (DSC) as well as good thermal reliability even after 30th cycle of heating and cooling process.
Highlights
Lauric acid (LA) has been recommended as economic, eco-friendly, and commercially viable materials to be used as phase change materials (PCMs)
Two weak peaks appeared at 1302 cm−1 and 726 cm−1 are attributed to the stretching vibration of O–C group and plane bending vibration of C–H bond[47]
Various kinds of analyses were conducted viz. Fourier transform infrared spectroscopy (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) to determine the properties of the microencapsulated LA/SiO2
Summary
Lauric acid (LA) has been recommended as economic, eco-friendly, and commercially viable materials to be used as phase change materials (PCMs). PCM with 50% LA i.e. LAPC-6 exhibited the highest encapsulation efficiency (96.50%) and encapsulation ratio (96.15%) through Differential scanning calorimetry (DSC) as well as good thermal reliability even after 30th cycle of heating and cooling process. It is a great concern of the scientific community about the rising trend of the world’s energy consumption. Organic PCMs i.e. paraffin and fatty acid have gained significant attention owing to their high storage capacity, excellent chemical stability and low cost[16,17]. Fatty acid PCMs cannot be used directly as construction building materials (CBMs) owing to their high super-cooling and low thermal conductivity issues. Sol–gel is a suitable method for the microencapsulation of PCMs owing to its simple operation under low-temperature c ondition[30,31]
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