Magnetic properties of iron oxide nanoparticles with a DMSA-modified surface

• Published in: Hyperfine interactions Vol. 242; no. 1
• Main Authors: Winiarczyk, K., Gac, W., Góral-Kowalczyk, M., Surowiec, Z.
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 01.12.2021; Springer Nature B.V
• Subjects: 5-10 September 2021; Atomic; Brasov; Condensed Matter Physics; Cooling curves; Dipole interactions; Ferrofluids; Hadrons; Heavy Ions; Hysteresis; Iron oxides; Magnetic levitation; Magnetic properties; Magnetism; Magnetite; Magnetometers; Molecular; Mossbauer spectroscopy; Nanoparticles; Nuclear Physics; Optical and Plasma Physics; Organic compounds; Physical properties; Physics; Physics and Astronomy; Proceedings of the International Conference on the Applications of the Mössbauer Effect (ICAME 2021); Romania; Room temperature; Spectrum analysis; Sugar; Surfaces and Interfaces; Thin Films; Superparamagnetism; Co-precipitation method; Magnetic nanoparticles; Mössbauer spectroscopy
• ISSN: 0304-3843; 1572-9540
• DOI: 10.1007/s10751-021-01768-w

The magnetic properties of magnetite nanoparticles (Fe 3 O 4 NPs) strongly depend on their chemical and physical parameters, which can be regulated by a controlled synthesis process. To improve the quality of the obtained nanoparticles, their surface is often modified with organic compounds (from the group of surfactants, sugars, proteins, or organic acid). In this study, we synthesized magnetite nanoparticles with a surface modified with the organic compound DMSA. Then, the nanocrystallites were characterized in terms of structure and morphology. To investigate the role of DMSA and to understand the adsorption mechanism, FTIR measurements were carried out. Using Mössbauer spectroscopy, we investigated temperature-induced changes in the magnetic properties of prepared samples. The spectra were recorded in a wide temperature range (from 4 K to 390 K) for two types of samples: powders and ferrofluids with various concentrations. In the case of powder samples, the superparamagnetic doublet appeared at room temperature. For magnetic suspensions, the spectra were more complicated. They consisted of superposition of asymmetrically broadened sextets and doublets, which was caused by the occurrence of long-range dipole-dipole interactions. These interactions affected the magnetic properties of the material and increased the blocking temperature. Additionally, the magnetic hysteresis and zero field cooling-field cooling (ZFC/FC) curves were measured with the use of a vibrating sample magnetometer.