Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Magnetic Analysis of MgFe Hydrotalcites as Powder and Dispersed in Thin Films within a Keratin Matrix

Version 1 : Received: 6 June 2023 / Approved: 6 June 2023 / Online: 6 June 2023 (12:15:21 CEST)

A peer-reviewed article of this Preprint also exists.

Dinelli, F.; Modestino, M.; Galluzzi, A.; Posati, T.; Seri, M.; Zamboni, R.; Sotgiu, G.; Polichetti, M. Magnetic Analysis of MgFe Hydrotalcites as Powder and Dispersed in Thin Films within a Keratin Matrix. Nanomaterials 2023, 13, 2029. Dinelli, F.; Modestino, M.; Galluzzi, A.; Posati, T.; Seri, M.; Zamboni, R.; Sotgiu, G.; Polichetti, M. Magnetic Analysis of MgFe Hydrotalcites as Powder and Dispersed in Thin Films within a Keratin Matrix. Nanomaterials 2023, 13, 2029.

Abstract

Hydrotalcites (HTlc) represents a class of nanostructured layered materials that may be employed in a variety of applications, from green to bio technologies. In this paper, we report an investigation on HTlc made of Mg and Fe, recently employed to improve the growth in vitro of osteoblasts within a keratin sponge. We have carried out an analysis of powder materials and of HTlc dispersed in keratin and spin-coated on a Si/SiO2 substrate at different temperatures. A DC magnetic study of the powders has been carried out with a Quantum Design Physical Property Measurement System, equipped with a Vibrating Sample Magnetometer. The data gathered prove that these HTlc are fully paramagnetic, and keratin shows a very small magnetic response. Optical and Atomic Force Microscopy analyses of the thin films provide a detailed picture of clusters randomly dispersed in the films with various dimensions. The magnetic properties of these films have been characterized using the Nano Magneto Optical Kerr Effect (NanoMOKE) down to 7.5K. The data collected show that the local magnetic properties can be mapped with a micrometric resolution distinguishing HTlc regions from keratin ones. This approach opens new perspectives in the characterization of these composite materials.

Keywords

Hydrotalcites; Magnetic properties; NanoMOKE; PPMS-VSM; Thin Films; Keratin

Subject

Physical Sciences, Condensed Matter Physics

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