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Study of the Phase Transitions in the Binary System NPG-TRIS for Thermal Energy Storage Applications

Neopentylglycol (NPG) and tris(hydroxymethyl)aminomethane (TRIS) are promising phase change materials (PCMs) for thermal energy storage (TES) applications. These molecules undergo reversible solid-solid phase transitions that are characterized by high enthalpy changes. This work investigates the NPG...

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Autores principales: Santos-Moreno, Sergio, Doppiu, Stefania, Lopez, Gabriel A., Marinova, Nevena, Serrano, Ángel, Silveira, Elena, Palomo del Barrio, Elena
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7085018/
https://www.ncbi.nlm.nih.gov/pubmed/32151040
http://dx.doi.org/10.3390/ma13051162
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author Santos-Moreno, Sergio
Doppiu, Stefania
Lopez, Gabriel A.
Marinova, Nevena
Serrano, Ángel
Silveira, Elena
Palomo del Barrio, Elena
author_facet Santos-Moreno, Sergio
Doppiu, Stefania
Lopez, Gabriel A.
Marinova, Nevena
Serrano, Ángel
Silveira, Elena
Palomo del Barrio, Elena
author_sort Santos-Moreno, Sergio
collection PubMed
description Neopentylglycol (NPG) and tris(hydroxymethyl)aminomethane (TRIS) are promising phase change materials (PCMs) for thermal energy storage (TES) applications. These molecules undergo reversible solid-solid phase transitions that are characterized by high enthalpy changes. This work investigates the NPG-TRIS binary system as a way to extend the use of both compounds in TES, looking for mixtures that cover transition temperatures different from those of pure compounds. The phase diagram of NPG-TRIS system has been established by thermal analysis. It reveals the existence of two eutectoids and one peritectic invariants, whose main properties as PCMs (transition temperature, enthalpy of phase transition, specific heat and density) have been determined. Of all transitions, only the eutectoid at 392 K shows sufficiently high enthalpy of solid-solid phase transition (150–227 J/g) and transition temperature significantly different from that of the solid-state transitions of pure compounds (NPG: 313 K; TRIS: 407 K). Special attention has also been paid to the analysis of metastability issues that could limit the usability of NPG, TRIS and their mixtures as PCMs. It is proven that the addition of small amounts of expanded graphite microparticles contributes to reduce the subcooling phenomena that characterizes NPG and TRIS and solve the reversibility problems observed in NPG/TRIS mixtures.
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spelling pubmed-70850182020-03-23 Study of the Phase Transitions in the Binary System NPG-TRIS for Thermal Energy Storage Applications Santos-Moreno, Sergio Doppiu, Stefania Lopez, Gabriel A. Marinova, Nevena Serrano, Ángel Silveira, Elena Palomo del Barrio, Elena Materials (Basel) Article Neopentylglycol (NPG) and tris(hydroxymethyl)aminomethane (TRIS) are promising phase change materials (PCMs) for thermal energy storage (TES) applications. These molecules undergo reversible solid-solid phase transitions that are characterized by high enthalpy changes. This work investigates the NPG-TRIS binary system as a way to extend the use of both compounds in TES, looking for mixtures that cover transition temperatures different from those of pure compounds. The phase diagram of NPG-TRIS system has been established by thermal analysis. It reveals the existence of two eutectoids and one peritectic invariants, whose main properties as PCMs (transition temperature, enthalpy of phase transition, specific heat and density) have been determined. Of all transitions, only the eutectoid at 392 K shows sufficiently high enthalpy of solid-solid phase transition (150–227 J/g) and transition temperature significantly different from that of the solid-state transitions of pure compounds (NPG: 313 K; TRIS: 407 K). Special attention has also been paid to the analysis of metastability issues that could limit the usability of NPG, TRIS and their mixtures as PCMs. It is proven that the addition of small amounts of expanded graphite microparticles contributes to reduce the subcooling phenomena that characterizes NPG and TRIS and solve the reversibility problems observed in NPG/TRIS mixtures. MDPI 2020-03-05 /pmc/articles/PMC7085018/ /pubmed/32151040 http://dx.doi.org/10.3390/ma13051162 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Santos-Moreno, Sergio
Doppiu, Stefania
Lopez, Gabriel A.
Marinova, Nevena
Serrano, Ángel
Silveira, Elena
Palomo del Barrio, Elena
Study of the Phase Transitions in the Binary System NPG-TRIS for Thermal Energy Storage Applications
title Study of the Phase Transitions in the Binary System NPG-TRIS for Thermal Energy Storage Applications
title_full Study of the Phase Transitions in the Binary System NPG-TRIS for Thermal Energy Storage Applications
title_fullStr Study of the Phase Transitions in the Binary System NPG-TRIS for Thermal Energy Storage Applications
title_full_unstemmed Study of the Phase Transitions in the Binary System NPG-TRIS for Thermal Energy Storage Applications
title_short Study of the Phase Transitions in the Binary System NPG-TRIS for Thermal Energy Storage Applications
title_sort study of the phase transitions in the binary system npg-tris for thermal energy storage applications
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7085018/
https://www.ncbi.nlm.nih.gov/pubmed/32151040
http://dx.doi.org/10.3390/ma13051162
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