Giant barocaloric effects in natural graphite/polydimethylsiloxane rubber composites.

Autor: Imamura, William, Usuda, Erik Oda, Lopes, Éder Sócrates Najar, Carvalho, Alexandre Magnus Gomes
Předmět:
Zdroj: Journal of Materials Science; Jan2022, Vol. 57 Issue 1, p311-323, 13p, 1 Diagram, 4 Charts, 5 Graphs
Abstrakt: 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. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
Externí odkaz:
Nepřihlášeným uživatelům se plný text nezobrazuje