A5053160308- Magnetic and transport properties of perovskites and related materials
- Rare-earth and actinide compounds
- Magnetic Properties of Alloys
- Advanced Condensed Matter Physics
- Magnetic Properties and Synthesis of Ferrites
- Nanoparticle-Based Drug Delivery
- Characterization and Applications of Magnetic Nanoparticles
- Heusler alloys: electronic and magnetic properties
- Iron oxide chemistry and applications
- Physics of Superconductivity and Magnetism
- Multiferroics and related materials
- Electronic and Structural Properties of Oxides
- Thermal Expansion and Ionic Conductivity
- Advanced Thermoelectric Materials and Devices
- MXene and MAX Phase Materials
- Metallurgical and Alloy Processes
- Advancements in Solid Oxide Fuel Cells
- Gold and Silver Nanoparticles Synthesis and Applications
- Magnetic properties of thin films
- Advanced biosensing and bioanalysis techniques
- Glass properties and applications
- Fuel Cells and Related Materials
- Shape Memory Alloy Transformations
- Gas Sensing Nanomaterials and Sensors
- Electrocatalysts for Energy Conversion
Babeș-Bolyai University
2013-2024
Manganese and zinc ferrite magnetic nanoparticles (MNPs) were successfully synthesizedusing the polyol method in ethylene glycol found to have high saturation magnetizationvalues (90–95 emu/g at 4 K) when formed by ~30-nm crystallites assembled an ~80-nm multicorestructure. Hyperthermia data revealed a sigmoidal dependence of specific absorption rate (SAR)on alternating field (AMF) amplitude, with remarkable SAR values waterof ~1200 W/gFe+Mn ~800 W/gFe+Zn for Mn Zn ferrites, respectively....
Iron oxide magnetic nanoparticles (IOMNPs) have been successfully synthesized by means of solvothermal reduction method employing polyethylene glycol (PEG200) as a solvent. The as-synthesized IOMNPs are poly-dispersed, highly crystalline, and exhibit cubic shape. size is strongly dependent on the reaction time ration between amount precursor PEG200 used in synthesis method. At low precursor/PEG200 ratio, coexist with polyhedral IOMNPs. structure morphology were thoroughly investigated using...
Efficient use of magnetic hyperthermia in clinical cancer treatment requires biocompatible nanoparticles (MNPs), with improved heating capabilities. Small (~34 nm) and large (~270 Fe₃O₄-MNPs were synthesized by means a polyol method polyethylene-glycol (PEG) ethylene-glycol (EG), respectively. They systematically investigated X-ray diffraction, transmission electron microscopy vibration sample magnetometry. Hyperthermia measurements showed that Specific Absorption Rate (SAR) dependence on...
We report the synthesis of magnetite nanoparticles (IOMNPs) using polyol method performed at elevated temperature (300 °C) and high pressure. The ferromagnetic polyhedral IOMNPs exhibited saturation magnetizations room (83 emu/g) a maximum specific absorption rate (SAR) 2400 W/gFe in water. uniform dispersion solid matrix led to monotonous increase SAR (3600 W/gFe) as concentration decreased. Cytotoxicity studies on two cell lines (cancer normal) Alamar Blues Neutral Red assays revealed...
Spinel ferrite nanoparticles represent a class of magnetic (MNPs) with enormous potential in hyperthermia. In this study, we investigated the and heating properties spinel soft NiFe2O4, MnFe2O4, hard CoFe2O4 MNPs comparable sizes (12–14 nm) synthesized by polyol method. Similar to ferrite, which predominantly is ferromagnetic at room temperature, display non-negligible coercivity (9–11 kA/m) arising from strong interparticle interactions. The capabilities were evaluated aqueous media...
Magnetic measurements and band structure calculations were performed on RT(2) RT(5) compounds, where R is a heavy rare-earth T = Fe, Co, Ni, Al, as well pseudobinary compounds GdCo(2 - x)A(x) (A Cu, Si), YFe(2 x)V(x) YCo(4 x)Ni(x)B. The calculated moments per formula unit described the experimentally determined magnetizations. By considering 4f-5d-3d exchange interactions, we evaluate contributions of local 4f-5d short range 5d-3d interactions to 5d Y 4d polarizations. induced polarizations...
Surface enhanced Raman spectroscopy (SERS) represents a promising technique in providing specific molecular information that could have major impact biomedical applications, such as early cancer detection. SERS requires the presence of suitable plasmonic substrate can generate and reproducible diagnostic relevant spectra. In this paper, we propose new approach for synthesis substrate, by using concentrated silver nanoparticles purified Tangential Flow Filtration method. The capacity our...
Increasing the biocompatibility, cellular uptake, and magnetic heating performance of ferromagnetic iron-oxide nanoparticles (F-MNPs) is clearly required to efficiently induce apoptosis cancer cells by hyperthermia (MH). Thus, F-MNPs were coated with silica layers different thicknesses via a reverse microemulsion method, their morphological, structural, properties evaluated multiple techniques. The presence SiO
We report the successful synthesis and a complete magnetic characterization of CoFe2O4@SiO2@Au magnetoplasmonic nanoparticles. The CoFe2O4 nanoparticles were prepared using hydrothermal method. A subsequent SiO2 shell followed by plasmonic Au deposited on core creating with core-shell architecture. spin-glass-type magnetism was shown at surface nanograins. Depending external field, two types spin-glass identified analyzed in correlation exchange field acting octahedral tetrahedral iron...
Cobalt ferrite magnetic nanoparticles (CFO) of around 9 nm were synthesized with the solvothermal method. The CFO particles covered a barium titanate (BTO) shell at 1:1 CFO:BTO ratio, via sol-gel synthesis, to form CFO@BTO nanocomposites. X-Ray Diffraction (XRD) studies reveal presence only expected and BTO phases. Scanning Transmission Electron Microscopy (SEM, TEM) images show thorough covering shell. Energy-Dispersive X-ray spectroscopy (EDX) mapping was used analyze elemental composition...
Co1−xMnxFe2O4 nanoparticles (0 ≤ x 1) have been prepared via the hydrothermal method. The samples were studied using X-ray diffraction measurements (XRD), transmission electron microscopy (TEM), Raman spectroscopy, and magnetic measurements. All found to be single phases a cubic Fd-3m structure. average crystalline sizes are between 7.8 15 nm. EDS analysis confirmed presence of cobalt, manganese, iron, oxygen in all samples. It was by spectroscopy that Fe3+ would placed on octahedral sites...
Co1−xZnxFe2O4 nanoparticles (0 ≤ x 1) have been synthesized via a green sol–gel combustion method. The prepared samples were studied using X-ray diffraction measurements (XRD), transmission electron microscopy (TEM), Raman, and magnetic measurements. All found to be single phases cubic Fd-3m structure. EDS analysis confirmed the presence of cobalt, zinc, iron, oxygen in all samples. Raman spectra clearly show that Zn ions are preferentially located T sites for low concentrations. Due their...