Size effects of nano-rutile TiO2 on latent heat recovered of binary eutectic hydrate salt phase change material

• Published in: Thermochimica acta Vol. 684; p. 178492
• Main Authors: Liu, Yushi, Yu, Kunyang, Yang, Yingzi, Jia, Minjie, Sun, Fuzheng
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.02.2020
• Subjects: Hydrate salt; Latent heat recovered; Phase change material; Rutile TiO2 nanoparticles; Size effects; Size effects; Phase change material; Rutile TiO2 nanoparticles; Latent heat recovered; Hydrate salt
• ISSN: 0040-6031; 1872-762X
• DOI: 10.1016/j.tca.2019.178492

•Size effects are highlighted based on rutile nano-TiO2/hydrate salt PCM.•Latent heat recovered is optimum when integrating 25 nm nano-TiO2 into EHS.•Explanation on nano-TiO2 promoting EHS nucleation is aided by SEM.•Size-dependent surface adsorption capacity of nano-TiO2 is revealed by FTIR spectra. In the current work, we reported the size effects of rutile TiO2 nanoparticles on the latent heat recovered of eutectic hydrate salt (EHS) phase change material (PCM). The nanoparticles modified EHS composites were prepared with different volume loadings (0.1 %, 0.3 % and 0.5 %) of TiO2 nanoparticles with two different sizes of 25 and 100 nm. The rheological behaviour analysis was carried out to demonstrate the dispersion stability of TiO2 nanoparticles in EHS. The factorial experiment method has been developed to evaluate the size effects of TiO2 nanoparticles. Meanwhile, the characterization technique, DSC was used to investigate the thermal properties. The results showed that the nanoparticles modified EHS composites incorporated with TiO2 nanoparticles in diameter of 25 nm achieved an optimal latent heat recovered, of which the mechanism analyses were validated by SEM and FT-IR. This study will provide insights into the further improvement of thermal properties of nanoparticles modified PCM composites by means of tailoring the size of nanoparticles.