The structural, morphological and magnetic properties of MFe2O4 (M = Co, Ni, Zn, Cu, Mn) type ferrites produced by thermal decomposition at 700 1000 °C were studied. analysis revealed that the are formed up to 350 °C. After heat treatment °C, single-phase ferrite nanoparticles attained, while after CoFe2O4 was accompanied Co3O4 MnFe2O4 α-Fe2O3. particle size spherical shape in nanoscale region confirmed transmission electron microscopy. specific surface area below 0.5 m2/g suggested a...

The formation, structure, and thermal magnetic properties of MFe2O4@SiO2 (M = Co, Mn, Zn, Ni, Cu) (60% MFe2O4/40% SiO2) nanocomposites produced by a modified sol-gel method, followed annealing at 300, 600, 900 1200 °C, were studied. analysis Fourier transform infrared spectroscopy showed the formation metal-glyoxylates below 210 °C their decomposition into corresponding ferrite around 300 °C. evolution crystalline phases variation crystallite sizes differs from to depends on temperature....

This paper presents the synthesis of metal doped Co ferrites, M0.2Co0.8Fe2O4 (M = Cu2+, Ni2+, and Zn2+) embedded in SiO2 matrix by an innovative sol-gel route. The structural morphological characterization provided information about crystalline phases, crystallite size, shape prepared ferrites. thermal study depicted decomposition stability obtained X-ray diffraction indicated nanocrystalline ferrites with spinel structure lack phase impurities, while Fourier transform infrared spectroscopy...

This paper presents the influence of Mn2+ substitution by Ni2+ on structural, morphological and magnetic properties Mn1-xNixFe2O4@SiO2 (x = 0, 0.25, 0.50, 0.75, 1.00) nanocomposites (NCs) obtained a modified sol-gel method. The Fourier transform infrared spectra confirm formation SiO2 matrix ferrite, while X-ray diffraction patterns show presence poorly crystalline ferrite at low annealing temperatures highly mixed cubic spinel accompanied secondary phases high temperatures. lattice...

The effect of SiO2 embedding on the obtaining single-phase ferrites, as well structure, morphology and magnetic properties (Zn0.6Mn0.4Fe2O4)δ(SiO2)100−δ (δ = 0–100%) nanoparticles (NPs) synthesized by sol-gel method was assessed. phase composition crystallite size were investigated X-ray diffraction (XRD), chemical transformations monitored Fourier transform infrared (FT-IR) spectroscopy, while NPs transmission electron microscopy (TEM). average 5.3–27.0 nm at 400 °C, 13.7–31.1 700 °C...

The structure, morphology and magnetic properties of (Ni0.6Mn0.4Fe2O4)α(SiO2)100-α (α = 0-100%) nanocomposites (NCs) produced by sol-gel synthesis were investigated using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), atomic force microscopy (AFM) vibrating sample magnetometry (VSM). At low calcination temperatures (300 °C), poorly crystallized Ni0.6Mn0.4Fe2O4, while at high temperatures, well-crystallized Ni0.6Mn0.4Fe2O4 was obtained along with α-Fe2O3, quartz,...

Sol-gel route followed by thermal treatment was used to produce NiFe2O4 doped with transition metal ions (Zn2+, Mn2+, Co2+). The structural, morphological, and magnetic properties of the were compared those virgin NiFe2O4. metal-glyoxylates' formation decomposition as well stability ferrites assessed analysis. functional groups identified Fourier-transform infrared spectroscopy confirmed nitrates, precursors, SiO2 matrix. X-ray diffraction indicated that sol-gel synthesis produced...

Background: Metal transfer along the food chain has raised concerns about impacts on human health due to dietary exposure low but chronic concentrations. Soil–forage–milk–consumer is a short through which metals are able reach an organism. Methods: Pb, Cu, Cd, and Zn were determined in water, soil, forage, milk samples collected from free-range cattle farms situated near Baia Mare, Romania. The soil-to-forage (TFsf) forage-to-milk (TFfm) factors for risk three population groups (females,...

In rural areas without centralized water supply systems, inhabitants often use groundwater of unknown quality as drinking water, understanding the possible negative consequences on their health. Karstic spring waters from Dobrogea region in Romania were assessed for potential to be used source, according and seasonal variation. The physico-chemical parameters compared with guideline values established by World Health Organization Directive 98/83/EC. nitrate Cr concentrations exceeded value...

Abstract. It is a common practice in developing countries and some regions of Europe that solid wastes generated households (e.g. plastic beverage packaging other wastes, textile fibreboards, furniture, tyres, coloured-paper waste) are burned wood- or coal-fired stoves during the winter months. In Europe, types volume municipal waste virtually unknown because these activities illegal not recorded, with exception few media reports court cases. Even though particulate emissions from burning...

This study aimed to investigate the ways in which thermal behavior, composition, and volatile compound contents of roasted coffee beans depend on variety roasting intensity. The analysis revealed various transformations namely, drying, water loss, decomposition polysaccharides, lipids, amino acids, proteins. results showed that compounds are released differently depending type degree roasting. most abundant present samples were 2-butanone, furan, 2-methylfuran, methyl formate,...

The paper presents the development, validation, and evaluation of measurement uncertainty a method for quantitative determination essential nonessential elements in medicinal plants their aqueous extracts by using inductively coupled plasma optical emission spectrometry. detailed validation analytical procedure calculation budget allowed recognition methods' critical points. obtained limit quantification, repeatability, were satisfactory. trueness was verified recovery estimation certified...