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2025
Journal Article
Title
Customizable Induction Heating Profiles: from Tailored Colloidally Stable Nanoparticles Toward MultiāStage Heatable Supraparticles
Abstract
Magnetic nanoparticles (NPs) are efficient heat mediators in induction heating. Originally explored for hyperthermia, their applications have broadened to industrial processes where temperature control is crucial. By adjusting the NP composition or morphology, magnetic characteristics such as Curie temperatures can be tailored, allowing control over maximum heating thresholds. These NPs are, however, usually designed for maximum heating rates at specific magnetic fields. In this work, the synthesis is presented for colloidally stable Co and ZnCo ferrite NPs with customizable maximum heating temperatures, and their combination within micronāscaled supraparticles (SPs). Maximum induction heating temperatures of ZnCo ferrite NPs are tuned between 150 and 220 Ā°C, while customization of Co ferrite species yields temperatures between 200 and 350 Ā°C. These distinct magnetic properties are exploited in the selective multiāstage heating of SPs consisting of both species. Here, ZnCo ferrite components heat up to a first temperature plateau at low alternating magnetic fields (AMF), while Co ferrite NPs reach higher temperatures at increased AMF. The precise control of induction heating thresholds through the adaptability of NPs offers a high degree of customizability which makes induction heating particularly attractive for applications requiring sequential or spatial heating, such as catalysis or debonding on demand.
Author(s)
Luthardt, Leoni
Friedrich-Alexander-UniversitƤt Erlangen-NĆ¼rnberg (FAU), Department of Chemistry and Pharmacy, Inorganic Chemistry
Raczka, Theodor
Friedrich-Alexander-UniversitƤt Erlangen-NĆ¼rnberg (FAU), Department of Chemistry and Pharmacy, Inorganic Chemistry
Hurle, Katrin
Friedrich-Alexander-UniversitƤt Erlangen-NĆ¼rnberg (FAU), GeoZentrum Nordbayern, Mineralogy
MĆ¼ssig, Stephan
Friedrich-Alexander-UniversitƤt Erlangen-NĆ¼rnberg (FAU), Department of Chemistry and Pharmacy, Inorganic Chemistry
Friedrich-Alexander-UniversitƤt Erlangen-NĆ¼rnberg (FAU), Department of Chemistry and Pharmacy, Inorganic Chemistry