{"id":3061,"date":"2022-12-10T09:08:43","date_gmt":"2022-12-10T08:08:43","guid":{"rendered":"https:\/\/www.um.sav.sk\/en\/?p=3061"},"modified":"2023-01-10T09:18:34","modified_gmt":"2023-01-10T08:18:34","slug":"1-nanotechnology-of-nanoparticle-colloids-based-on-high-entropy-alloys-using-ionic-liquids","status":"publish","type":"post","link":"https:\/\/www.um.sav.sk\/en\/selected-results\/1-nanotechnology-of-nanoparticle-colloids-based-on-high-entropy-alloys-using-ionic-liquids\/","title":{"rendered":"Nanotechnology of nanoparticle colloids based on high-entropy alloys using ionic liquids"},"content":{"rendered":"

A. Dvure\u010denskij, A. Cig\u00e1\u0148, , M. \u0160kr\u00e1tek, M. Majerov\u00e1, J. Ma\u0148ka<\/p>\n

In colloids of metal nanoparticles based on high-entropy alloys (HEA-High Entropy Alloys) in imidazolium-based ionic liquids, the properties of three objects meet: ionic liquids, HEA alloys and nanoparticles.<\/span><\/span> Each of them separately exhibits unique properties that have attracted considerable attention in recent decades due to their significant impact on emerging applications with high potential, e.g.<\/span><\/span> for new “green” technologies in the field of production of new materials, equipment, in the field of environmental protection, energy savings, etc.<\/span><\/span> Ionic liquids have unique physico-chemical properties such as high ionic conductivity, non-flammability, high thermal and chemical stability.<\/span><\/span> HEAs are alloys that contain at least five elements in equal concentration.<\/span><\/span> HEAs are used for extreme temperature, functional thermoelectric, superconducting, magnetic or magnetocaloric materials.<\/span><\/span> They exhibit slow diffusion under stress leading to the so-called<\/span><\/span> “self-healing”.<\/span><\/span> The structural and magnetic properties of colloidal CoCrCuFeNi HEA nanoparticles in ionic liquid [BMIM.BF4] obtained by magnetron sputtering were studied.<\/span><\/span> Colloids contain ultra-small monocrystalline nanoparticles (2\u20133) nm in size.<\/span><\/span> These nanocolloids (NK) exhibit complex magnetic properties that are a function of temperature, applied magnetic field, and mass content of nanoparticles in the colloids, in Fig.<\/span><\/span> The obtained results indicate significant magnetic interactions between the ionic liquid and the HEA nanoparticles and the structure.<\/span><\/span> They are among the first to show a significant change in magnetic properties with temperature, e.g.<\/span><\/span> of [BMIM.BF4] itself and on the competing nature of the diamagnetic and paramagnetic components.<\/span><\/span><\/span><\/p>\n

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Mass magnetization Ma [BMIM.BF4] HEA NK-L and NK-H as a function of the applied magnetic field H at a temperature of 2 K. Arrows indicate the direction of increase or<\/span><\/span> reduction of the applied magnetic field of the main magnetization loops of both nanocolloids with low and high concentration of nanoparticles, starting from zero field.<\/span><\/span> <\/span><\/p>\n

Related projects:<\/span><\/span><\/strong> VEGA 2\/0141\/21 and APVV-16-0263.<\/span><\/span> The result was achieved in cooperation with the SAV Electrotechnical Institute, the Center for Energy Research, the Hungarian Academy of Sciences and the SAV Institute of Polymers.<\/span><\/span> <\/span><\/p>\n

Publication in CC magazine:<\/span><\/span><\/span><\/strong><\/p>\n