Preparation, Characterization, and Modification of Sodium Acetate Trihydrate-Urea Binary Eutectic Mixtures As Phase Change Material

Abstract

A sodium acetate trihydrate (SAT)-urea binary eutectic mixture was developed as a phase change material (PCM). Using the differential scanning calorimetry (DSC) experiment and synthetic visual method, the solid–liquid phase diagram of SAT-urea was obtained, through which the eutectic composition of SAT-urea binary mixture was determined. The results show that the binary eutectic point composition formed by 60 wt % SAT and 40 wt % urea melted at the temperature of 31.4 °C with a latent heat of 205.3 J/g. XRD, FTIR, 1H NMR, and DFT calculation results show that the interactions of SAT and urea were intermolecular hydrogen bonds, and no clear chemical interactions were observed. The modification of SAT-urea eutectic PCM was studied by the uniform experimental method. The results show that for the SAT-urea eutectic with 3 wt % disodium phosphate dodecahydrate (DSP) and 2.18 wt % carboxymethyl cellulose (CMC), the supercooling degree is decreased to 2.9 °C, which is consistent with the calculation results. After 50 thermal cycles, SAT-urea eutectic PCM exhibits good thermal stability and reliability.

Solubility of Amino Acids in the Eutectic Solvent Constituted by Sodium Acetate Trihydrate and Urea and in Its Mixture with Water

“…The existence of eutectic behavior in this system would overcome this issue, expanding the liquid range of the mixture while fully keeping the properties of its constituents. The solid–liquid equilibrium of this system has been previously studied [ 24 , 28 , 29 ]. However, some discrepancies were found regarding the eutectic composition.…”

Advancements in organic and inorganic shell materials for the preparation of microencapsulated phase change materials for thermal energy storage applications

“…Supercooling, phase segregation, and other problems can affect the ability of inorganic PCMs like salts and salt hydrates to store energy. 79,80 Although inorganic materials are promising and suitable for their use as PCMs for thermal energy storage, they currently face challenges in becoming successful commercial products because of their several drawbacks. One of the most challenging properties of inorganic salts is the change in volume during phase transition, and one weakness of this eld is the lack of knowledge of the relationship between density and temperature.…”

Comparative Analysis of Additives for Increasing Thermal Conductivity of Phase Change Materials: A Review

“…However, OPCMs have a certain fire risk due to their flammability. At the same time, their relatively low energy storage density, relatively high price, and relatively low TC also affect the performance of OPCMs in air-conditioning systems. , Adding additives or other materials to form a CPCM can increase its TC and reduce costs to a certain extent. This part of the content will be described in section 3 of this article.…”