The magnetopyroelectric effect: heat-mediated magnetoelectricity in magnetic nanoparticle-ferroelectric polymer composites

Llacer-Wintle, Joaquin; Hertle, Lukas; Veciana, Andrea Picazo; Arx, Denis von; Wu, Jihuai; Bruna, Pere; Vukomanović, Marija; Puigmartí‐Luis, Josep; Nelson, Bradley J.; Chen, Xiang‐Zhong

doi:10.1039/d2mh01361d

Mater. Horiz.

2023

DOI: 10.1039/d2mh01361d

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The magnetopyroelectric effect: heat-mediated magnetoelectricity in magnetic nanoparticle-ferroelectric polymer composites

Joaquin Llacer-Wintle

Lukas Hertle

Andrea Picazo Veciana

et al.

Abstract: Magnetoelectricity enables a solid-state material to generate electricity under magnetic fields. Most magnetoelectric composites are developed through a strain-mediated route by coupling piezoelectric and magnetostrictive phases. However, the limited availability...

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Cited by 4 publications

References 55 publications

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Single‐Step Synthesis of Sub‐10 nm Magnetic Nanoparticles with High Saturation Magnetization and Broad pH Stability

Pustovalov,

Landers,

Hertle

et al. 2024

Adv Eng Mater

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Iron oxide nanoparticles hold great potential for future biomedical applications but, to date, usually suffer from reduced magnetic properties compared to their bulk counterparts. The replacement of Fe(III) ions with Zn(II) ions can enhance their magnetic properties while keeping their biocompatibility characteristics. Yet, common synthesis methods for these highly magnetic particles require using environmentally harmful solvents, multiple steps, and postfunctionalization, all while being affected by poor scalability and high polydispersity. To address these challenges, in this study, a single‐step coprecipitation‐based method is developed to fabricate gelatin‐coated, zinc‐substituted, sub‐10 nm‐sized iron oxide nanoparticles exhibiting high saturation magnetization. This single‐step synthesis benefits from simplicity and robustness, capable of yielding large amounts of highly magnetic nanoparticles without the utilization of environmentally harmful or highly toxic reagents. Furthermore, in situ gelatin coating during the synthesis ensures particle stability in aqueous solutions over a wide range of pH and enhances cell compatibility. Systematic investigations show a direct correlation between the particles’ magnetization and the concentrations of Zn(II) and NaOH, where particles with a zinc‐to‐iron ratio of Zn:Fe = 0.18:2.82 reach a maximum saturation magnetization of 91.2 emu g−1. Thus, these particles are promising candidates for biomedical applications.

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Single‐Step Synthesis of Sub‐10 nm Magnetic Nanoparticles with High Saturation Magnetization and Broad pH Stability

Pustovalov,

Landers,

Hertle

et al. 2024

Adv Eng Mater

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A Simple In Situ Marker Guiding Shape‐Controlled Synthesis of Iron Oxide Nanoparticles

Llacer‐Wintle,

Hertle,

Ziegler

et al. 2024

Adv Funct Materials

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Thermal decomposition of iron oleate is a simple and widespread method for synthesizing monodispersed iron oxide nanoparticles (IONPs) with well‐defined morphology. However, the complexity of the underlying mechanism makes this method rather sensitive to variations in experimental conditions, and the lack of simple techniques to monitor the reaction progress in situ usually results in poor reproducibility and time‐consuming optimizations. Here, a simple, robust, and versatile in situ marker to monitor particle formation based on a sudden change in the temperature during reflux is reported. A linear relationship between the onset of particle formation and the concentration of surfactants is unveiled, corroborating a ‘chemically activated’ burst nucleation mechanism. Using this linear relationship as a guide, highly uniform spherical, cubic, and star‐shaped particles between 12 and 30 nm can be obtained. This temperature marker and the derived linear relationship not only deepen the understanding of the reaction process, but also provide a powerful tool for the straightforward optimization of IONPs.

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PVDF–novel double perovskite (Nd2MnFeO6) organic–inorganic nano-composite membrane: for flexible energy storage devices

Dorle,

Acharya,

Shirbhate

2023

Polym. Bull.

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The magnetopyroelectric effect: heat-mediated magnetoelectricity in magnetic nanoparticle-ferroelectric polymer composites

Abstract: Magnetoelectricity enables a solid-state material to generate electricity under magnetic fields. Most magnetoelectric composites are developed through a strain-mediated route by coupling piezoelectric and magnetostrictive phases. However, the limited availability...

Cited by 4 publications

References 55 publications

Single‐Step Synthesis of Sub‐10 nm Magnetic Nanoparticles with High Saturation Magnetization and Broad pH Stability

Single‐Step Synthesis of Sub‐10 nm Magnetic Nanoparticles with High Saturation Magnetization and Broad pH Stability

A Simple In Situ Marker Guiding Shape‐Controlled Synthesis of Iron Oxide Nanoparticles

PVDF–novel double perovskite (Nd2MnFeO6) organic–inorganic nano-composite membrane: for flexible energy storage devices

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