Artículo
The role of the interactions at the tungsten disulphide surface in the stability and enhanced thermal properties of nanofluids with application in solar thermal energy
Autor/es | Martínez Merino, Paloma
Sánchez Coronilla, Antonio Alcántara, Rodrigo Martín Fernández, Elisa Isabel Carrillo Berdugo, Iván Gómez Villarejo, Roberto Navas, Javier |
Departamento | Universidad de Sevilla. Departamento de Química Física Universidad de Sevilla. Departamento de Ingeniería Química |
Fecha de publicación | 2020 |
Fecha de depósito | 2020-06-16 |
Publicado en |
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Resumen | Transition metal dichalcogenides (TMCs) exhibit unique properties that make them of interest for catalysis, sensing or energy storage applications. However, few studies have been performed into nanofluids based on TMCs for ... Transition metal dichalcogenides (TMCs) exhibit unique properties that make them of interest for catalysis, sensing or energy storage applications. However, few studies have been performed into nanofluids based on TMCs for heat transfer applications. In this study, nanofluids based on 2D-WS2 are prepared by liquid phase exfoliation to analyze their potential usage in concentrating solar power plants. Periodic-Density Functional Theory (DFT) calculations were performed to rationalize the success of the exfoliation process. The hydrogen bond interaction between the hydroxyl group from PEG, which acts as a surfactant, and the S atoms of the WS2 surface stabilizes the nanosheets in the fluid. Electron localization function (ELF) analysis is indicative of the stability of the S–H interaction from WS2 with the molecules of surfactant due to the tendency to interact through weak intermolecular forces of van der Waals solids. Moreover, improvements in thermal properties were also found. Isobaric specific heat increased by up to 10% and thermal conductivity improved by up to 37.3%. The high stability of the nanofluids and the thermal improvements were associated with the high surface area of WS2 nanosheets. These results suggest that these nanofluids could be a promising heat transfer fluid in concentrating solar power plants. |
Identificador del proyecto | RTI2018-096393-B-I00
UNCA15-CE-2945 SOL-201800107510-TRA |
Cita | Martínez Merino, P., Sánchez Coronilla, A., Alcántara, R., Martín Fernández, E.I., Carrillo Berdugo, I., Gómez Villarejo, R. y Navas, J. (2020). The role of the interactions at the tungsten disulphide surface in the stability and enhanced thermal properties of nanofluids with application in solar thermal energy. Nanomaterials, 10 (5), 970. |
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