Anomalous acoustic phonons as the physical mechanism behind the adiabatic barocaloric effect on graphene

A graphene sheet is able to either heat up or cool down due to a mechanical strain: this is the adiabatic barocaloric effect. In order to understand the physical mechanism behind this effect, we have explored the adiabatic temperature change of the graphene and, for this purpose, we considered two c...

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Autores principales: Ma, Ning, Reis, Mario S.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2019
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6338743/
https://www.ncbi.nlm.nih.gov/pubmed/30659225
http://dx.doi.org/10.1038/s41598-018-36525-7
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author Ma, Ning
Reis, Mario S.
author_facet Ma, Ning
Reis, Mario S.
author_sort Ma, Ning
collection PubMed
description A graphene sheet is able to either heat up or cool down due to a mechanical strain: this is the adiabatic barocaloric effect. In order to understand the physical mechanism behind this effect, we have explored the adiabatic temperature change of the graphene and, for this purpose, we considered two contributions to the total entropy: a lattice entropy (depending on the transversal, longitudinal and anomalous out-of-plane acoustic phonons) and a strain entropy. We found that the adiabatic barocaloric effect only depends on the strain energy and the anomalous acoustic phonons, without terms due to the transversal and longitudinal acoustic phonons.
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spelling pubmed-63387432019-01-22 Anomalous acoustic phonons as the physical mechanism behind the adiabatic barocaloric effect on graphene Ma, Ning Reis, Mario S. Sci Rep Article A graphene sheet is able to either heat up or cool down due to a mechanical strain: this is the adiabatic barocaloric effect. In order to understand the physical mechanism behind this effect, we have explored the adiabatic temperature change of the graphene and, for this purpose, we considered two contributions to the total entropy: a lattice entropy (depending on the transversal, longitudinal and anomalous out-of-plane acoustic phonons) and a strain entropy. We found that the adiabatic barocaloric effect only depends on the strain energy and the anomalous acoustic phonons, without terms due to the transversal and longitudinal acoustic phonons. Nature Publishing Group UK 2019-01-18 /pmc/articles/PMC6338743/ /pubmed/30659225 http://dx.doi.org/10.1038/s41598-018-36525-7 Text en © The Author(s) 2019 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Ma, Ning
Reis, Mario S.
Anomalous acoustic phonons as the physical mechanism behind the adiabatic barocaloric effect on graphene
title Anomalous acoustic phonons as the physical mechanism behind the adiabatic barocaloric effect on graphene
title_full Anomalous acoustic phonons as the physical mechanism behind the adiabatic barocaloric effect on graphene
title_fullStr Anomalous acoustic phonons as the physical mechanism behind the adiabatic barocaloric effect on graphene
title_full_unstemmed Anomalous acoustic phonons as the physical mechanism behind the adiabatic barocaloric effect on graphene
title_short Anomalous acoustic phonons as the physical mechanism behind the adiabatic barocaloric effect on graphene
title_sort anomalous acoustic phonons as the physical mechanism behind the adiabatic barocaloric effect on graphene
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6338743/
https://www.ncbi.nlm.nih.gov/pubmed/30659225
http://dx.doi.org/10.1038/s41598-018-36525-7
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