Device for Direct Barocaloric Measurement

• Published in: International journal of thermophysics 2025, Vol.46 (3), Article 38
• Main Authors: Moia, Marcelo Augusto Yanes, Colman, Flavio Clareth, Giudai, Gustavo Hannoun, Imamura, William, Usuda, Erik Oda, Fornazaro, Gabriel, Aguiar, Laís Weber, dos Santos Conceição, Wagner André, Coutinho, Monica Ronobo, Favaro, Silvia Luciana, Alves, Cleber Santiago, Carvalho, Alexandre Magnus Gomes, Trevizoli, Paulo Vinicius, Junior, Jader Riso Barbosa, de Cássia Colman Simões, Rita, Radovanovic, Eduardo, Bocca, Jean Rodrigo
• Format: Article
• Language: English
• Subjects: Classical Mechanics; Coconut oil; Condensed Matter Physics; High temperature; Industrial Chemistry/Chemical Engineering; Initial conditions; Phase transitions; Physical Chemistry; Physics; Physics and Astronomy; Pressure chambers
• ISSN: 0195-928X; 1572-9567
• DOI: 10.1007/s10765-025-03511-x

Direct measurements of adiabatic temperature change ( Δ T S ) to characterize the barocaloric effect (σ b -CE) were a challenge and a point of interest for many research groups. In this work, we propose a device to measure Δ T S in a system with a simplified design and a new method to seal the pressure chamber. This new concept was tested for several materials in solid or liquid states. The methodology involves acquiring a temperature curve as a function of time under desired initial conditions. The results showed that the equipment can measure solid-state materials in powder, flakes, or solid bodies, in the absence or presence of a phase transition. When using coconut oil at high temperatures, for example, the apparatus remained sealed until the end of the experimental run. Promising values of σ b -CE, ranging from large to colossal, were captured for polymers, composites, first-order-transition materials, coconut oil, paraffin. This concept can inspire new research groups to develop equipment to study the barocaloric effect.