|About this Abstract
|2022 TMS Annual Meeting & Exhibition
|REWAS 2022: Energy Technologies and CO2 Management
|Solidification of Salt Hydrate Eutectics Using Multiple Nucleation Agents
|Sophia Ahmed, Robert Mach, Haley Jones, Fabiola Alamo, Patrick Shamberger
|On-Site Speaker (Planned)
Salt hydrates are a class of phase change materials (PCMs) capable of storing thermal energy at a high volumetric energy density for a low cost (<$10 /kWhth), making them of great interest for improving the energy efficiency of buildings. However, salt hydrates are susceptible to undercooling – the occurrence of a metastable liquid below the melting point due to a lack of nucleation sites for the crystalline solid. Here, we present a study of phase-specific epitaxial nucleation agents which mitigate undercooling in zinc nitrate hexahydrate and lithium nitrate trihydrate systems, including nitrate eutectics based on these compounds. While eutectics tend to depress melting temperatures into favorable ranges, we demonstrate that the nucleation of multiple phases in systems susceptible to undercooling can increase the potential for phase segregation to occur. We demonstrate for the first time the utility of multiple nucleation agents in these systems to co-crystallize multiple crystalline phases.
|Energy Conversion and Storage, Phase Transformations, Solidification