Giant barocaloric effects in natural graphite/polydimethylsiloxane rubber composites

Solid-state cooling based on caloric effects is considered a viable alternative to replace the conventional vapor-compression refrigeration systems. Regarding barocaloric materials, recent results show that elastomers are promising candidates for cooling applications around room temperature. However...

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Bibliographic Details
Published in:Journal of materials science 2022, Vol.57 (1), p.311-323
Main Authors: Imamura, William, Usuda, Erik Oda, Lopes, Éder Sócrates Najar, Carvalho, Alexandre Magnus Gomes
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Chemical Routes to Materials
Chemistry and Materials Science
Classical Mechanics
Composite materials
Crystallography and Scattering Methods
Elastomers
Electric properties
Graphite
Heat transfer
Insulation
Materials Science
Polydimethylsiloxane
Polymer Sciences
Refrigeration equipment
Room temperature
Rubber
Solid Mechanics
Solid state
Thermal conductivity
Thermal diffusivity
Thermal properties
Vapor compression refrigeration
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Summary:Solid-state cooling based on caloric effects is considered a viable alternative to replace the conventional vapor-compression refrigeration systems. Regarding barocaloric materials, recent results show that elastomers are promising candidates for cooling applications around room temperature. However, elastomers are insulating materials, which is a disadvantage that may compromise practical applications, since high heat transfer properties are typically desirable for more efficiency. Herein, barocaloric effects are investigated in natural graphite/polydimethylsiloxane rubber composites (NG/PDMS), in different concentrations of natural graphite. Adding natural graphite to PDMS, the adiabatic temperature change and the isothermal entropy change of the NG/PDMS composites reduce when compared to PDMS, but the composites still remain in giant barocaloric class and achieve an increase up to ~ 500% in thermal diffusivity and thermal conductivity. The results are promising for solid-state cooling based on barocaloric effect because the NG/PDMS composites combine different desired properties and are identified as better or similar among different barocaloric materials reported in the literature. Graphical abstract
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-021-06649-9