Studies of the Magnetite Nanoparticles by Means of Mössbauer Spectroscopy

Kalska-Szostko, B.; Zubowska, M.; Satuła, D.

doi:10.12693/aphyspola.109.365

Cited by 24 publications

(8 citation statements)

References 10 publications

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“…Additionally, in this pattern, one can see yet another component (about 25%). It can be connected with disordered nanoparticles surface [13] and/or with magnetic interaction between nanoparticles [14]. The component related to surface atoms increases with increasing temperature.…”

Section: Resultsmentioning

confidence: 99%

Investigation of magnetite Fe₃O₄ nanoparticles for magnetic hyperthermia

2017

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Abstract. The paper presents the investigation of magnetic nanoparticles (MNPs) dedicated to hyperthermia application. The crystal structure and size distributions have been determined by means of transmission electron microscope (TEM) and X-ray diffraction (XRD). Magnetic properties of the nanoparticles were tested by Mössbauer spectroscopy together with calorimetric experiments. The Mössbauer spectroscopic study of MNPs revealed the existence of a superparamagnetic phase. The relative contribution of the relaxing component to the total spectrum at room temperature was about 10%. The heating effect of these MNPs under alternating magnetic fi eld was examined. The temperature increase has reached 5°C in 10 min. The preliminary temperature rise suggests that the investigated materials are applicable for hyperthermia.

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Section: Resultsmentioning

confidence: 99%

Investigation of magnetite Fe₃O₄ nanoparticles for magnetic hyperthermia

2017

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“…Although 295 K data were collected for all samples, they were not useful because some of the Fe oxides were too fine‐grained to be magnetically ordered at that temperature. Such superparamagnetism has been observed in both biogenic and synthetic magnetite at particle sizes below ~13 nm, often manifested as a doublet in room temperature Mössbauer spectra (Hassett et al ., ; Vali et al ., ; Weiss et al ., ; Ambashta et al ., ; Kalska‐Szostko et al ., ; Bandhu et al ., ; Li et al ., ; Marquez‐Linares et al ., ; Starowicz et al ., ; Zając et al ., ). The magnetic field of superparamagnetic nanoparticles varies in direction faster than the inverse lifetime of the 57 Fe nuclear excited state (on the order of 10 7 s −1 ).…”

Section: Methodsmentioning

confidence: 99%

Magnetite formation from ferrihydrite by hyperthermophilic archaea from Endeavour Segment, Juan de Fuca Ridge hydrothermal vent chimneys

et al. 2014

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Hyperthermophilic iron reducers are common in hydrothermal chimneys found along the Endeavour Segment in the northeastern Pacific Ocean based on culture-dependent estimates. However, information on the availability of Fe(III) (oxyhydr) oxides within these chimneys, the types of Fe(III) (oxyhydr) oxides utilized by the organisms, rates and environmental constraints of hyperthermophilic iron reduction, and mineral end products is needed to determine their biogeochemical significance and are addressed in this study. Thin-section petrography on the interior of a hydrothermal chimney from the Dante edifice at Endeavour showed a thin coat of Fe(III) (oxyhydr) oxide associated with amorphous silica on the exposed outer surfaces of pyrrhotite, sphalerite, and chalcopyrite in pore spaces, along with anhydrite precipitation in the pores that is indicative of seawater ingress. The iron sulfide minerals were likely oxidized to Fe(III) (oxyhydr) oxide with increasing pH and Eh due to cooling and seawater exposure, providing reactants for bioreduction. Culture-dependent estimates of hyperthermophilic iron reducer abundances in this sample were 1740 and 10 cells per gram (dry weight) of material from the outer surface and the marcasite-sphalerite-rich interior, respectively. Two hyperthermophilic iron reducers, Hyperthermus sp. Ro04 and Pyrodictium sp. Su06, were isolated from other active hydrothermal chimneys on the Endeavour Segment. Strain Ro04 is a neutrophilic (pH opt 7-8) heterotroph, while strain Su06 is a mildly acidophilic (pH opt 5), hydrogenotrophic autotroph, both with optimal growth temperatures of 90-92 °C. Mössbauer spectroscopy of the iron oxides before and after growth demonstrated that both organisms form nanophase (<12 nm) magnetite [Fe3 O4 ] from laboratory-synthesized ferrihydrite [Fe10 O14 (OH)2 ] with no detectable mineral intermediates. They produced up to 40 mm Fe(2+) in a growth-dependent manner, while all abiotic and biotic controls produced <3 mm Fe(2+) . Hyperthermophilic iron reducers may have a growth advantage over other hyperthermophiles in hydrothermal systems that are mildly acidic where mineral weathering at increased temperatures occurs.

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“…The scenario of the variable nanoparticles growth regime as a function of surfactant concentration can explain the suppression of superparamagnetic fluctuation for higher surfactant quantity. Magnetite nanoparticles are observed as being more stable with regard to superparamagnetic fluctuations than maghemite [47], which gives them advantage in eventual magnetic hyperthermia applications [48]. In the case of OLA, TOA, HA, DOA, and TEA such effect is not visible.…”

Section: Mössbauer Spectroscopymentioning

confidence: 99%

Importance of Surfactant Quantity and Quality on Growth Regime of Iron Oxide Nanoparticles

et al. 2020

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This study shows the influence of selected nonstandard surfactants on the growth and properties of magnetite nanoparticles. Particles were obtained using thermally decomposed iron (III) acetylacetonate in an organic environment. For synthesis, three different concentrations (4, 8, and 16 mmol) of tested surfactants were used. Five types of each long-chain carboxylic acid and amines were selected for stabilization of nanoparticles. Nanoparticles were characterized by X-ray diffraction, transmission electron microscopy, and infrared spectroscopy. Magnetic properties of the nanoparticles were tested by conventional room temperature Mössbauer spectroscopy with and without external magnetic field. TEM images clearly showed that application of tertiary amines causes the nanoparticles to form nanoflowers, in contrast to other compounds, which do not show such growth. Influence of surfactant amount on growth regime depends on the nature of the substances. Mössbauer spectroscopy confirms differences in magnetic core composition as a result of the surfactant amount present in synthetic procedure.

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Studies of the Magnetite Nanoparticles by Means of Mössbauer Spectroscopy

Cited by 24 publications

References 10 publications

Investigation of magnetite Fe₃O₄ nanoparticles for magnetic hyperthermia

Investigation of magnetite Fe₃O₄ nanoparticles for magnetic hyperthermia

Magnetite formation from ferrihydrite by hyperthermophilic archaea from Endeavour Segment, Juan de Fuca Ridge hydrothermal vent chimneys

Importance of Surfactant Quantity and Quality on Growth Regime of Iron Oxide Nanoparticles

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Studies of the Magnetite Nanoparticles by Means of Mössbauer Spectroscopy

Cited by 24 publications

References 10 publications

Investigation of magnetite Fe3O4 nanoparticles for magnetic hyperthermia

Investigation of magnetite Fe3O4 nanoparticles for magnetic hyperthermia

Magnetite formation from ferrihydrite by hyperthermophilic archaea from Endeavour Segment, Juan de Fuca Ridge hydrothermal vent chimneys

Importance of Surfactant Quantity and Quality on Growth Regime of Iron Oxide Nanoparticles

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Investigation of magnetite Fe₃O₄ nanoparticles for magnetic hyperthermia

Investigation of magnetite Fe₃O₄ nanoparticles for magnetic hyperthermia