Mechanical and magnetocaloric adjustable properties of Fe₃O₄/PET deformed nanoparticle film

Abstract

The flexibility of nanoparticle films is a topic of rapidly growing interest in both scientific and engineering research, due to their numerous potential applications in a broad range of wearable electronics and biomedical devices. This article presents elucidation of the properties of nanoparticle films. Here, a flexible film is fabricated based on Polyethylene Terephthalate (PET) and magnetic iron oxide at the nanoscale using layer-by-layer technology. The 2D thin flexible film material can be bent at different angles from 0° to 360°. With an increase in elastic deformation angles, the magnetocaloric effect of the film gradually increases in the alternating magnetic field. Test results from the vibrating sample magnetometer and low frequency impedance analyzer demonstrate that the film has a good magnetic response and anisotropy. The magnetocaloric effect and magnetic induction effect are controlled by deformation, providing a new idea for the application of elastic films. It combines the flexibility of the nanoparticle PET substrate, and in the future, it may be used for skin adhesion for administration and magnetic stimulation control.