Study of phase transformations, structural, corrosion properties and cytotoxicity of magnetite-based nanoparticles

Kozlovskiy, Artem L.; Ermekova, A.E.; Korolkov, Ilya V.; Chudoba, Dorota; Jażdżewska, Monika; Łudzik, Katarzyna; Nazarova, A.; Marciniak, Beata; Kontek, Renata; Shumskaya, Elena; Здоровец, М. В.

doi:10.1016/j.vacuum.2019.02.029

Cited by 35 publications

(24 citation statements)

References 53 publications

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“…[49,50] The phase transition from maghemite to hematite is usually observed at temperatures in the range of 300-650°C, depending on duration of heating, size, and crystal face of the particles and the method of sample preparation. [49,51,52] In the present study maghemite was not detected in the samples by Raman spectroscopy or XRD. It might argue for the firing temperature exceeded 650°C.…”

Section: Discussioncontrasting

confidence: 55%

Raman spectroscopy for firing condition characterization: Case study of Karelian medieval pottery

Chazhengina

Summanen

Светов

2019

J Raman Spectroscopy

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Raman spectroscopy together with the scanning electron microscopy and X‐ray diffraction were applied to study the firing parameters (temperature and atmosphere) of medieval pottery from Karelian hill forts in the North‐Western Ladoga region (Russia). Because the evidences of pottery manufacture including firing facilities were not discovered during the excavations of medieval Karelian fortresses, the application of Raman spectroscopy combined with the other techniques appeared to be an effective approach to reconstruct the technology of ceramic production in medieval Karelia. Scanning electron microscopy ‐energy‐dispersive X‐ray spectroscopy and X‐ray diffraction analysis showed that the Karelian pottery refers to noncalcareous and low‐temperature fired ceramics. Using the thermometer based on the thermal evolution of Raman spectral parameters of the charcoal identified in the ceramic paste of some specimens, the firing temperature for those was estimated to be close to 800 °C. These data are in accordance with the more frequent occurrence of anatase rather than rutile in the studied ceramic sherds that also corresponds to low firing temperature. The presence of hematite suggests firing in oxidizing atmosphere, in rare case the detected magnetite indicated the incomplete oxidizing atmosphere. The reconstruction of Karelian pottery firing procedure based on the obtained data supposes that the firing was carried out in bonfires. The present study contributes to the deciphering the firing conditions for noncalcareous and low‐temperature burnt ceramics, for which no significant modifications of starting minerals during heating are usually observed.

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Section: Discussioncontrasting

confidence: 55%

Raman spectroscopy for firing condition characterization: Case study of Karelian medieval pottery

Chazhengina

Summanen

Светов

2019

J Raman Spectroscopy

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“…As can be seen from the data presented for the initial nanostructures, broadening of diffraction peaks was observed, and two low-intensity peaks with Miller indices (200) and (220) are present, which indicates the presence of crystallites oriented in these directions in the structure. The asymmetric broadened shape of diffraction peaks for the initial nanotubes indicates the influence of both the size factor and the deformation factor on the change in structural properties [49,50]. For irradiated samples, a change in the intensities of diffraction maxima was observed with a complete dominance of the (111) diffraction maximum at an irradiation doses of 300 kGy and higher, while the intensity of diffraction maxima (200) and (220) for irradiated samples with a dose above 300 kGy is comparable with the background intensity radiation.…”

Section: Experimental Partmentioning

confidence: 99%

Investigation of the Structural Changes and Catalytic Properties of FeNi Nanostructures as a Result of Exposure to Gamma Radiation

et al. 2020

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The paper presents the results of changes in the structural characteristics, and the degree of texturing of FeNi nanostructures close in composition to permalloy compounds as a result of directed modification by gamma radiation with an energy of 1.35 MeV and doses from 100 to 500 kGy. The choices of energy and radiation doses were due to the need to modify the structural properties, which consisted of annealing the point defects that occurred during the synthesis along the entire length of the nanotubes. The initial FeNi nanostructures were polycrystalline nanotubes of anisotropic crystallite orientation, obtained by electrochemical deposition. The study found that exposure to gamma rays led to fewer defects in the structure, and reorientation of crystallites, and at doses above 300 kGy, the presence of one selected texture direction (111) in the structure. During tests of the corrosion resistance of synthesized and modified nanostructures in a PBS solution at various temperatures, it was found that exposure to gamma rays led to a significant decrease in the rate of degradation of nanotubes and an increase in the potential life of up to 20 days. It was established that at the first stage of testing, the degradation of nanostructures is accompanied by the formation of oxide inclusions, which subsequently lead to the formation of pitting corrosion and subsequent partial or complete destruction of the nanostructures. It is shown that gamma radiation is promising not only for targeted modification of nanostructures and increasing resistance to degradation, but also for increasing the rate of catalytic reactions of the PNA-PPD type.

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“…Despite the simplicity and efficiency of the application of the mechanical chemical method of synthesis to obtain perovskite-like structures, this method does not allow to obtain particles of nanoscale diameter with clearly controlled phase and stoichiometric compositions. One way to obtain such particles is to combine methods of chemical synthesis with subsequent thermal annealing of the nanoparticles obtained [38,39].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Properties of Ferrite-Based Nanoparticles

et al. 2019

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The work is dedicated to the study of the structural and optical characteristics, as well as the phase transformations, of ferrite nanoparticles of CeO2-Fe2O3. To characterize the results obtained, the methods of scanning and transmission microscopy, X-ray diffraction (XRD) spectroscopy, and Mössbauer spectroscopy were applied. It was found that the initial nanoparticles are polycrystalline structures based on cerium oxide with the presence of X-ray amorphous inclusions in the structure, which are characteristic of iron oxide. The study determined the dynamics of phase and structural transformations, as well as the appearance of a magnetic texture depending on the annealing temperature. According to the Mossbauer spectroscopy data, it has been established that a rise in the annealing temperature gives rise to an ordering of the magnetic properties and a decrease in the concentration of cationic and vacancy defects in the structure. During the life test of synthesized nanoparticles as cathode materials for lithium-ion batteries, the dependences of the cathode lifetime on the phase composition of nanoparticles were established. It is established that the appearance of a magnetic component in the structure result in a growth in the resource lifetime and the number of operating cycles. The results show the prospects of using these nanoparticles as the basis for lithium-ion batteries, and the simplicity of synthesis and the ability to control phase transformations opens up the possibility of scalable production of these nanoparticles for cathode materials.

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Study of phase transformations, structural, corrosion properties and cytotoxicity of magnetite-based nanoparticles

Cited by 35 publications

References 53 publications

Raman spectroscopy for firing condition characterization: Case study of Karelian medieval pottery

Raman spectroscopy for firing condition characterization: Case study of Karelian medieval pottery

Investigation of the Structural Changes and Catalytic Properties of FeNi Nanostructures as a Result of Exposure to Gamma Radiation

Synthesis and Properties of Ferrite-Based Nanoparticles

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