Giant room-temperature barocaloric effects in PDMS rubber at low pressures

Author(s)

Carvalho, A. M. G. ^[1] ; Imamura, W. ^{[2, 1]} ; Usuda, E. O. ^[1] ; Bom, N. M. ^[1]

Affiliation

^[1] CNPEM, LNLS, BR-13083970 Campinas, SP - Brazil

^[2] Univ Estadual Campinas, Fac Engn Mecan, BR-13083860 Campinas, SP - Brazil

• Document type: Journal article
• Source: EUROPEAN POLYMER JOURNAL; v. 99, p. 212-221, FEB 2018.
• Web of Science Citations: 7

Abstract

The barocaloric effect is still an incipient scientific topic, but it has been attracting an increasing attention in the last years due to the promising perspectives for its application in alternative cooling devices. Here, we present giant values of barocaloric entropy change and temperature change induced by low pressures in PDMS elastomer around room temperature. Adiabatic temperature changes of 12.0 K and 28.5 K were directly measured for pressure changes of 173 MPa and 390 MPa, respectively, associated with large normalized temperature changes (similar to 70 K GPa(-1)). From adiabatic temperature change data, we obtained entropy change values larger than 140 J kg(-1) K-1. We found barocaloric effect values that exceed those previously reported for any promising barocaloric materials from direct measurements of temperature change around room temperature. Our results stimulate the study of the barocaloric effect in elastomeric polymers and broaden the pathway to use this effect in solid-state cooling technologies. (AU)

• FAPESP's process: 12/03480-0 - Magnetocaloric effect and barocaloric effect: new experimental techniques, materials and theoretical models
• Grantee: Alexandre Magnus Gomes Carvalho
• Support Opportunities: Research Grants - Young Investigators Grants