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The influence of the surface modification on the magnetism of 4–14 nm sized core and core/shell gallium ferrites obtained by different preparation methods (Massart's and thermal decomposition from acetylacetonates) was studied. The physical properties of GaxFe3-xO4 were investigated in a wide range of Ga admixtures 0 ≤ x ≤ 1.5. Ga ions location at 8a or/and 16d positions of a spinel structure depends on the synthesis method and has a pronounced effect on the superparamagnetic properties of nanoparticles. Magnetization and Mössbauer experiments show the dominant superparamagnetic contribution for the nanoparticles with x > 0.8 with the blocking temperature TB significantly below 200 K. Surface-modified nanoferrites disclosed spontaneous magnetization that does not exceed 60 emu/g. [ABSTRACT FROM AUTHOR]

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. [ABSTRACT FROM AUTHOR]

This paper describes preparation and characterization of magnetic core–shell nanoparticles with modulated magnetic core diameter and various thickness of the non-magnetic shell. Ag, Au and Cu are used as spacing layer metals. Nanoparticles were fabricated by the synthetic method based on modified seeds. During the preparation, the thicknesses of the core and shell were changed to control the influence of nanoparticles’ magnetic properties in respect to the composition and thickness of the spacer material. Obtained nanoparticles were examined by X-ray diffraction, transmission electron microscopy, infrared spectroscopy and differential scanning calorimetry. Magnetic properties of the nanoparticles were tested by Mössbauer spectroscopy. [ABSTRACT FROM AUTHOR]

Highlights: [•] Core–shell nanoparticles with various shell layers were fabricated. [•] The influence on magnetic properties from layer composition was observed. [•] The influence on quality of layer from their composition was tested. [ABSTRACT FROM AUTHOR]

Highlights: [•] Stability tests of core–shell nanoparticles were performed. [•] Various durability in studied solutions was observed. [•] The influence on magnetic properties from wetting solution was observed. [Copyright &y& Elsevier]

Highlights: [•] Organophosphorous compound modification of magnetic nanoparticles has been obtained. [•] Successful connection with trypsin via organophosphorous compounds has been tested. [•] Influence on modification from particles coating layer have been tested. [ABSTRACT FROM AUTHOR]

Highlights: [•] Organophosphorous compound modification of nanowires has been obtained. [•] Successful connection with trypsin via organophosphorous compounds has been tested. [•] Influence on modification from wires surface layer has been tested. [ABSTRACT FROM AUTHOR]

[Display omitted] • The influence of synthetic procedure on nanoparticles growth was tested. • The influence of dopant concentration on nanoparticles growth was established. • The correlation between particles growth condition and magnetic properties was achieved. The studies presented in this paper show the results of synthesis and physicochemical characterization of modified ferrite nanoparticles, which can be described by the general formula M x Fe 3-x O 4 (where x = 0.15 or 0.45) doped with Al3+, Cr3+, Cu2+ and Zn2+ ions. The nanoparticles were obtained through procedures using either water or organic environment. The aim of this study was to determine the influence of synthetic routine and doping on the quality of the obtained structure, morphology and magnetic properties of nanoparticles. Additionally, doping concentration of selected elements is a crucial influence on the crystallinity and magnetic properties of the obtained nanoparticles. Doped nanoparticles were synthesized by two chemical methods: co-precipitation of iron chlorides in a basic solution and thermal decomposition of iron(III) acetylacetonate in an organic high-boiling solvent. Obtained nanoparticles were characterized by transmission electron microscopy, energy dispersive X-ray, X-ray diffraction, porosimetry, infrared spectroscopy and Mössbauer spectroscopy. [ABSTRACT FROM AUTHOR]