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Abstract <p>This work reports the development of a thermoresponsive composite material based on poly(<i>N</i>-isopropylacrylamide) (PNIPAM) and FeRh alloy microflakes for biomedical applications. PNIPAM is a polymer exhibiting a sharp, reversible phase transition at its lower critical solution temperature (LCST) near physiological conditions, making it attractive for smart coatings and drug delivery. FeRh alloy undergoes a first-order antiferromagnetic–ferromagnetic (AFM-FM) transition with a pronounced magnetocaloric effect (MCE), enabling magnetic field–induced thermal control. The study was conducted within a project on the impact of particle size reduction on the AFM–FM transition and MCE. It was shown that FeRh flakes of ~200 μm in diameter and ~1 μm in thickness retain a transition temperature comparable to the bulk alloy, and a simple hand-filing method provides an effective route to obtain such structures. Microflakes were characterized by SEM, XRD, and Magnetic Properties Measurement System, while PNIPAM was grafted onto their surface via a “grafting-to” approach. Atomic force microscopy confirmed successful functionalization. The resulting FeRh–PNIPAM composites combine thermal and magnetic responsiveness, offering a promising platform for smart implants, controlled drug delivery, and adaptive biomedical coatings.</p>

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Structure and Magnetic Properties of FeRh Microflakes

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • D. A. Kanurin,
  • A. A. Amirov,
  • A. S. Komlev,
  • N. Yu. Tabachkova,
  • T. S. Ilina,
  • A. V. Turutin,
  • D. S. Gorbunov,
  • A. A. Gogin,
  • V. V. Govorina,
  • A. M. Tishin

摘要

Abstract

This work reports the development of a thermoresponsive composite material based on poly(N-isopropylacrylamide) (PNIPAM) and FeRh alloy microflakes for biomedical applications. PNIPAM is a polymer exhibiting a sharp, reversible phase transition at its lower critical solution temperature (LCST) near physiological conditions, making it attractive for smart coatings and drug delivery. FeRh alloy undergoes a first-order antiferromagnetic–ferromagnetic (AFM-FM) transition with a pronounced magnetocaloric effect (MCE), enabling magnetic field–induced thermal control. The study was conducted within a project on the impact of particle size reduction on the AFM–FM transition and MCE. It was shown that FeRh flakes of ~200 μm in diameter and ~1 μm in thickness retain a transition temperature comparable to the bulk alloy, and a simple hand-filing method provides an effective route to obtain such structures. Microflakes were characterized by SEM, XRD, and Magnetic Properties Measurement System, while PNIPAM was grafted onto their surface via a “grafting-to” approach. Atomic force microscopy confirmed successful functionalization. The resulting FeRh–PNIPAM composites combine thermal and magnetic responsiveness, offering a promising platform for smart implants, controlled drug delivery, and adaptive biomedical coatings.