The Kissinger model is used to assess the phase change kinetics of the prepared nano-PCM composites. According to the XRD and FTIR results, MWCNTs physically amalgamated with base eutectic salt without affecting their chemical structure. In this article, the thermophysical properties of binary eutectic PCM salt (LiNO3 + NaCl) are investigated experimentally using the dispersion of multi-walled carbon nanotubes (MWCNTs) with varying weight fractions (i.e., 0.25 %, 0.5 %, and 1 %). This optimum neural network effectively predicts nanocapsules' thermophysical properties with higher accuracy (i.e., R² = 0.99). The optimum neural architecture is obtained at a 3-36-1 structure. The experimental differential scanning calorimetry outcomes are taken to train the neural networks. The artificial neural network models were developed to predict the thermophysical properties of nano-encapsulated PCM samples at different heating rates. The activation energy (AE) of the pure PCM and NEPCM samples were calculated by the Kissinger, Ozawa, and Starink models. The phase change characteristics and thermal stability of the NEPCM samples were determined using simultaneous differential scanning calorimetry and thermogravimetric analyzer equipment. A scanning electron microscope and a particle distribution analyzer were used to examine nanocapsules' surface morphology and size distribution. The chemical structure of NEPCM salts was investigated using X-ray diffraction and Fourier transformation infrared analysis. This research work utilized the emulsification sol–gel method to synthesize two different types of nano-encapsulated phase change material (NEPCM) salts (i.e., SiO2 shell-based PCM and TiO2 shell-based PCM). Their nano-sized capsules allow for a more efficient design of thermal energy storage systems. It exhibits a remarkable photocatalytic activity.Molten salts were chosen as a thermal storage medium because they were best suited for medium-temperature thermal energy storage applications.Ti self-doped yolk–shell structure titanium oxide is obtained at low temperature. EuS−ZnO was found to be stable and reusable without appreciable loss of catalytic activity up to four consecutive cycles. The results revealed that the photocatalytic activity of EuS−ZnO was much higher than that of ZnO under natural sunlight. The catalytic activity of EuS−ZnO core shell nanorod arrays were evaluated by the photodegradation of Methylene Blue (MB) dye under visible irradiation. TEM study confirmed that the surface of ZnO was drastically improved by the modification with EuS nanoparticle. UV-Vis DRS spectra showed that the optical absorption of ZnO was significantly enhanced to the visible more » region by modification with EuS surfaces. Cross sectional FESEM images show vertical rod array structure, and the size of the nanorods ranges from 80 to 120 nm. The XRD pattern confirmed formation of the hexagonal wurtzite structure of ZnO and cubic nature of the EuS. In this article, we report the preparation of vertically aligned core shell ZnO-EuS nanorod photocatalyst arrays by a simple chemical solution process followed by sulfudation process. We demonstrated the development of coupled semiconductor in the form of hybrid heterostructures for significant advancement in catalytic functional materials.
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