Quantitative determination of content of magnetite and maghemite in their mixtures by X-ray diffraction methods

Mikhaylova, A. B.; Сиротинкин, В. П.; Федотов, М. А.; Korneyev, V. P.; Shamray, B. F.; Kovalenko, L. V.

doi:10.1134/s2075113316010160

Cited by 10 publications

(9 citation statements)

References 14 publications

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“…This is related to the occupancy of the drug in the interlayer space of MLDH. Due to reflections for the magnetite and maghemite phase in the XRD patterns that are very close to each other, it cannot be ruled out that the synthesized samples are composed of a mixture of maghemite and magnetite phases 44 , 45 . However, because the magnetite synthesis was carried out under non-oxidizing conditions, the probability of the presence of the maghemite phase is low.…”

Section: Resultsmentioning

confidence: 99%

Release of a liver anticancer drug, sorafenib from its PVA/LDH- and PEG/LDH-coated iron oxide nanoparticles for drug delivery applications

Ebadi

Saifullah

Buskara

et al. 2020

Sci Rep

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The use of nanocarriers composed of polyethylene glycol- and polyvinyl alcohol-coated vesicles encapsulating active molecules in place of conventional chemotherapy drugs can reduce many of the chemotherapy-associated challenges because of the increased drug concentration at the diseased area in the body. The present study investigated the structure and magnetic properties of iron oxide nanoparticles in the presence of polyvinyl alcohol and polyethylene glycol as the basic surface coating agents. We used superparamagnetic iron oxide nanoparticles (FNPs) as the core and studied their effectiveness when two polymers, namely polyvinyl alcohol (PVA) and polyethylene glycol (PEG), were used as the coating agents together with magnesium–aluminum-layered double hydroxide (MLDH) as the nanocarrier. In addition, the anticancer drug sorafenib (SO), was loaded on MLDH and coated onto the surface of the nanoparticles, to best exploit this nano-drug delivery system for biomedical applications. Samples were prepared by the co-precipitation method, and the resulting formation of the nanoparticles was confirmed by X-ray, FTIR, TEM, SEM, DLS, HPLC, UV–Vis, TGA and VSM. The X-ray diffraction results indicated that all the as-synthesized samples contained highly crystalline and pure Fe3O4. Transmission electron microscopy analysis showed that the shape of FPEGSO-MLDH nanoparticles was generally spherical, with a mean diameter of 17 nm, compared to 19 nm for FPVASO-MLDH. Fourier transform infrared spectroscopy confirmed the presence of nanocarriers with polymer-coating on the surface of iron oxide nanoparticles and the existence of loaded active drug consisting of sorafenib. Thermogravimetric analyses demonstrated the thermal stability of the nanoparticles, which displayed enhanced anticancer effect after coating. Vibrating sample magnetometer (VSM) curves of both produced samples showed superparamagnetic behavior with the high saturation magnetization of 57 emu/g for FPEGSO-MLDH and 49 emu/g for FPVASO-MLDH. The scanning electron microscopy (SEM) images showed a narrow size distribution of both final samples. The SO drug loading and the release behavior from FPEGSO-MLDH and FPVASO-MLDH were assessed by ultraviolet–visible spectroscopy. This evaluation showed around 85% drug release within 72 h, while 74% of sorafenib was released in phosphate buffer solution at pH 4.8. The release profiles of sorafenib from the two designed samples were found to be sustained according to pseudo-second-order kinetics. The cytotoxicity studies confirmed the anti-cancer activity of the coated nanoparticles loaded with SO against liver cancer cells, HepG2. Conversely, the drug delivery system was less toxic than the pure drug towards fibroblast-type 3T3 cells.

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Section: Resultsmentioning

confidence: 99%

Release of a liver anticancer drug, sorafenib from its PVA/LDH- and PEG/LDH-coated iron oxide nanoparticles for drug delivery applications

Ebadi

Saifullah

Buskara

et al. 2020

Sci Rep

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“…One complication which can arise when identifying magnetite through XRD is due to the similarity of its diffractogram to that of maghemite. Both iron oxides have almost identical lattice parameters and spinel structure (Figure ), and consequently, their respective reflections heavily overlap. ,− Minor differences in the diffractogram of maghemite exist in the form of additional reflections at 0.373 Å (210) and 0.340 Å (213). These reflections can possibly be used to distinguish magnetite from maghemite, but in reality, their intensities are too weak (∼5%) for the positive identification of the maghemite phase.…”

Section: Identification and Quantification Techniquesmentioning

confidence: 99%

“…[323][324][325][326] Minor differences in the diffractogram of maghemite exist in the form of additional reflections at 0.373 Å (210) and 0.340 Å(213). These reflections can possibly be used to distinguish magnetite from maghemite but in reality their intensities are too weak (~5%) for the positive identification of the maghemite phase.…”

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confidence: 99%

Magnetite and Green Rust: Synthesis, Properties, and Environmental Applications of Mixed-Valent Iron Minerals

et al. 2018

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Mixed-valent iron [Fe(II)-Fe(III)] minerals such as magnetite and green rust have received a significant amount of attention over recent decades, especially in the environmental sciences. These mineral phases are intrinsic and essential parts of biogeochemical cycling of metals and organic carbon and play an important role regarding the mobility, toxicity, and redox transformation of organic and inorganic pollutants. The formation pathways, mineral properties, and applications of magnetite and green rust are currently active areas of research in geochemistry, environmental mineralogy, geomicrobiology, material sciences, environmental engineering, and environmental remediation. These aspects ultimately dictate the reactivity of magnetite and green rust in the environment, which has important consequences for the application of these mineral phases, for example in remediation strategies. In this review we discuss the properties, occurrence, formation by biotic as well as abiotic pathways, characterization techniques, and environmental applications of magnetite and green rust in the environment. The aim is to present a detailed overview of the key aspects related to these mineral phases which can be used as an important resource for researchers working in a diverse range of fields dealing with mixed-valent iron minerals.

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“…For the first series ( Figure 2 a), the patterns show diffraction lines corresponding to magnetite, Fe 3 O 4 , as the major phase and maghemite (about 20%) (JCPDS no. 01-076-1849) [ 42 , 43 , 44 ]. The average crystallite size calculated using the (311) plane was 22 nm (M1) 29 m, (M1-S1) and 23 nm (M1-S2).…”

Section: Resultsmentioning

confidence: 99%

“…The lattice constants were refined using Whole Powder Pattern Fitting (WPPF). The average crystallite size was calculated from the (311) diffraction line using Scherrer’s equation: D = kλ/(β·cosθ) where k = 0.90, λ is the wavelength of X-ray, β is full width at the half maximum (FWHM) of the peak is the diffraction angle [ 42 , 43 , 44 ].…”

Section: Methodsmentioning

confidence: 99%

Magnetic Core-Shell Iron Oxides-Based Nanophotocatalysts and Nanoadsorbents for Multifunctional Thin Films

et al. 2022

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In recent years, iron oxides-based nanostructured composite materials are of particular interest for the preparation of multifunctional thin films and membranes to be used in sustainable magnetic field adsorption and photocatalysis processes, intelligent coatings, and packing or bio-medical applications. In this paper, superparamagnetic iron oxide (core)-silica (shell) nanoparticles suitable for thin films and membrane functionalization were obtained by co-precipitation and ultrasonic-assisted sol-gel methods. The comparative/combined effect of the magnetic core co-precipitation temperature (80 and 95 °C) and ZnO-doping of the silica shell on the photocatalytic and nano-sorption properties of the resulted composite nanoparticles were investigated by ultraviolet-visible (UV-VIS) spectroscopy monitoring the discoloration of methylene blue (MB) solution under ultraviolet (UV) irradiation and darkness, respectively. The morphology, structure, textural, and magnetic parameters of the investigated powders were evidenced by scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman spectroscopy, Brunauer–Emmett–Teller (BET) measurements, and saturation magnetization (vibrating sample magnetometry, VSM). The intraparticle diffusion model controlled the MB adsorption. The pseudo- and second-order kinetics described the MB photodegradation. When using SiO2-shell functionalized nanoparticles, the adsorption and photodegradation constant rates are three–four times higher than for using starting core iron oxide nanoparticles. The obtained magnetic nanoparticles (MNPs) were tested for films deposition.

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Quantitative determination of content of magnetite and maghemite in their mixtures by X-ray diffraction methods

Cited by 10 publications

References 14 publications

Release of a liver anticancer drug, sorafenib from its PVA/LDH- and PEG/LDH-coated iron oxide nanoparticles for drug delivery applications

Release of a liver anticancer drug, sorafenib from its PVA/LDH- and PEG/LDH-coated iron oxide nanoparticles for drug delivery applications

Magnetite and Green Rust: Synthesis, Properties, and Environmental Applications of Mixed-Valent Iron Minerals

Magnetic Core-Shell Iron Oxides-Based Nanophotocatalysts and Nanoadsorbents for Multifunctional Thin Films

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