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Studies of the Magnetite Nanoparticles by Means of Mössbauer Spectroscopy

100%
Kalska-Szostko B., Zubowska M., Satuła D.
Acta Physica Polonica A
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2006
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vol. 109
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issue 3
365-369
EN
The magnetite nanoparticles were prepared by modified Massart's method in water and in alcohol. The influence of the condition of preparation on the properties of magnetite nanoparticles were investigated by Mössbauer spectroscopy. The size of the particles were determined by transmission electron microscopy. It was shown that the particles size in the alcoholic reaction is smaller than in aqueous reaction. Moreover, the increase in the reaction time improves the stoichiometry of magnetite nanoparticles.
2
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Mössbauer Studies of Core-Shell Nanoparticles.

100%
Kalska-Szostko B., Cydzik M., Satuła D., Giersig M.
Acta Physica Polonica A
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2011
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vol. 119
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issue 1
15-17
EN
The ferrite magnetic nanoparticles with core-shell structures were obtained in two step preparation process. The Mössbauer spectra obtained for particles of pure maghemite or magnetite and two layered core-shell one the magnetite on maghemite and maghemite on magnetite are very different from each other. The presented results show that interparticle and intraparticle interaction plays important role in overall magnetic properties as well.
3
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Microstructure and Magnetic Properties of Iron Oxide Nanoparticles Prepared by Wet Chemical Method

88%
Satuła D., Kalska-Szostko B., Szymański K., Dobrzyński L., Kozubowski J.
Acta Physica Polonica A
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2008
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vol. 114
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issue 6
1615-1621
EN
The magnetic properties of iron oxide nanoparticles prepared by the chemical decomposition of the iron chlorides with the ratio Fe^{3+}/Fe^{2+}=2.25 were studied by means of transmission electron microscopy, X-ray diffraction and Mössbauer spectroscopy in- and without external magnetic field. The transmission electron microscopy studies show that the nanoparticles have spherical shape with diameter about 13 nm. The transmission electron microscopy and X-ray diffraction patterns are composed of lines that could be indexed within the cubic spinel structure. The room temperature Mössbauer spectrum shows the coexistence of the broad magnetically split part and superparamagnetic doublet. The in-field Mössbauer measurements carried out in the temperature range from room temperature down to 13 K show a gradual increase in the spin canting on the surface of the nanoparticles and decrease in the intensity of the superparamagnetic doublet. The sample was subjected to annealing process performed at elevated temperature in air atmosphere in order to change the microstructure of the nanoparticles and in consequence to change the magnetic properties of the sample. The annealing process leads to the decrease in the value of quadrupole splitting of the superparamagnetic doublets.
4
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Electrochemical Deposition of Nanowires in Porous Alumina

76%
Kalska-Szostko B., Brancewicz E., Mazalski P., Sveklo J., Olszewski W., Szymański K., Sidor A.
Acta Physica Polonica A
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2009
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vol. 115
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issue 2
542-544
EN
Electrochemical deposition is a very efficient method for producing many types of modern materials. The method is not expensive and does not have a limit for sample size. In our work the preparation of Ni, Co and Fe nanowires is presented. The obtained nanowires had different diameter and length which were tunable by template porous material and time of deposition, respectively. The quality of the prepared wires was dependent also on deposition mode. The smallest wires of the diameter around 40 nm were prepared in porous anodic alumina oxide obtained from oxalic acid. The largest ones, around 120 nm, were produced in phosphoric acid. The length could be as large as the thickness of the oxide and reached up to about 1 μm. The morphology of wires was studied by atomic force microscopy and scanning electron microscopy. The magnetic characterization was done with usage of magnetic force microscopy and the Mössbauer spectroscopy. The wires show magnetization along their growth direction.
5
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Electrical and Magnetic Properties of Selected Fe-Based High Entropy Alloys

64%
Perzyńska K., Go A., Szymański K., Biernacka M., Hawełek Ł., Kalska-Szostko B., Oleszak D., Rećko K., Waliszewski J., Zaleski P.
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vol. 126
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issue 4
999-1004
EN
The electrical and magnetic properties of Fe_{0.5}A_{0.5} alloys are presented, where the A corresponds to various compositions of the elements: A = (Al, Si, V, Cr, Co, Ga, Ni, Ge). The system is closely related to the known family of high entropy alloys. The samples were synthesized by arc melting and/or melt spinning technique and exhibit a regular type of crystal structure. Lattice parameters are systematically smaller than the estimates based on metallic radiuses of the elements. Temperature dependences of resistivities show maxima for some compositions. This behavior is consistent with results of electronic structure calculations, where a low density of states at the Fermi level were predicted. Also the measured magnetic moments are in good agreement with results of calculations. It is thus presented that some physical properties can be designed by appropriate choice of the chemical composition within the same simple structure.
6
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Preparation and Characterization of Magnetic Nanoparticles

52%
Khmara I., Kubovcikova M., Koneracka M., Kalska-Szostko B., Zavisova V., Antal I., Rajnak M., Dankova Z., Kavecansky V., Omastova M., Kopcansky P.
Acta Physica Polonica A
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2018
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vol. 133
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issue 3
704-706
EN
The magnetic nanoparticles with core diameter 10 nm were modified by poly-L-lysine to bind antibody for cancer cell detection. Prepared biocompatible magnetic fluid (MFPLL) was characterized by dynamic light scattering method to obtain the particle size distribution. The microstructure of the MNPs and MFPLL samples were studied by transmission electron microscopy, X-ray diffraction and Mössbauer spectroscopy. Magnetic properties of the samples were measured by SQUID magnetometer and superparamagnetic behaviour of the samples was confirmed.
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