Determination of Electrocaloric and Elastocaloric Properties of Flexible Polymer-Ferroelectric Composites with Various Connectivity
Abstract
Modern technology using electronic circuits, batteries and miniaturized devices requires on-board cooling devices and solid-state refrigeration configurations instead of conventional cooling technologies to cool down these high-performance devices. Electrocaloric effect, which is the main subject of this project, is a coupling between electrical and thermal properties and it is an electric field induced entropy change in insulating materials. Refrigeration based on the ECE approach is more environmentally friendly, low cost, and suitable for mass production and miniaturization. Main aim of the current project proposal is to to improve the ECE properties using a combination of innovative approaches, namely incorporate relaxor ferroelectric ceramic particles - fibers with micro or nano features into a polymer matrix in 0-3 or 1-3 phase connectivity. The polymer matrix would be in thick film form with a ferroelectric or paraelectric character. Thereby, we aim to access the higher differenceT-differenceE values of the inorganic relaxors in a wide temperature regime while utilize the flexibility-conformability and higher dielectric breakdown strengths of the polymers. As a basic science study, beside the differenceT-differenceE investigation using the composite from, the contribution of elastocaloric effect, called as secondary effect that arises due to a change in the dimensions through the piezoelectric effect will also be evaluated on the EC performance of the composites. The effect of phase connectivity (0-3 and 1-3) of the composites on the electrocaloric coefficients will be analytically studied using rule of mixtures. Using composite form will provide mechanical flexibility for the ceramic phase, formability and this form will be useful for potential EC device design without supporting substrates. These configurations will also provide light weight and compact device configuration for potential EC devices.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Feb 29, 2024
- Source ID
- FA95502310296
Entities
People
- Ebru Mensur Alkoy
Organizations
- Air Force Office of Scientific Research
- Gebze Institute of Technology
- United States Air Force