S. V. Rempel

Structure of cadmium sulfide nanoparticle micelle in aqueous solutions

The structure of cadmium sulfide (CdS) micelle in stable aqueous solution of ethylenediaminetetraacetic acid was determined by dynamic light scattering, small-angle X-ray scattering and neutron scattering. The micelle aggregate is a single CdS nanoparticle with an average size of about 3 nm, the nanoparticle organic shell and the solvation shell are about 1 nm and 5 nm thick, respectively. These parameters were confirmed by the scanning semi-contact atomic force microscopy and powder X-ray diffraction studies of dry micelle cores isolated by high-speed centrifugation. The CdS micelle was correctly described by a simple double-shell model and was found to possess the structure corresponding to CdS quantum dots.

X-ray Diffraction Study of the Nanostructure Resulting from Decomposition of (ZrC)1 –x(NbC)x Solid Solutions

Solid-state decomposition of nearly equimolar ZrC–NbC solid solutions was studied by x-ray diffraction. The results demonstrate that annealing broadens the diffraction peaks from the solid solutions. Analysis of the peak width as a function of the diffraction angle indicates that the broadening is due to the decomposition of the solid solution into two coherent isostructural (B1) phases close in lattice parameter (0.4573 and 0.4561 nm) and the formation of nanometer-sized (≃70 nm) grains. The nanostructure remains stable during long-term (100 to 700 h) annealing between 670 and 1270 K.

Fluorescent CdS nanoparticles for cell imaging

Fluorescent cadmium sulfide nanoparticles stabilized by an organic shell based on ethylenediaminetetraacetic acid have been prepared by chemical condensation in an aqueous solution. The nanoparticle concentration in aqueous solutions has been optimized and it has been shown that such hybrid nanoparticles can be used to image cell cultures and explore the cell structure. Not only the nanoparticle concentration but also the incubation time of the nanoparticle solution with the cell culture are essential for observing structural details.

Microstructure and microhardness of vanadium oxides in the range VO0.57-VO1.29

AbstractX-ray diffraction and optical microscopy data are presented which demonstrate that substoichiometric vanadium oxide (VO0.57-VO0.97) consists of a cubic phase with the B1 structure (sp. gr. Fm

Influence of the size and charge of nonstoichiometric silver sulfide nanoparticles on their interaction with blood cells

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Synthesis and optical properties of glass with cadmium sulfide nanoparticles

m) and an ordered monoclinic phase of composition V14O6 (sp. gr. C2/m). The content of the latter phase decreases with increasing oxygen content. The superstoichiometric vanadium oxide VO1.29 is shown to contain trace amounts of V52O64. Vickers microhardness data for nonstoichiometric vanadium oxides in the range VO0.57-VO1.29 show that, with increasing oxygen content, their HV has a tendency to decrease, from 18 to 12 GPa. Their microhardness is shown for the first time to have a maximum near the stoichiometric composition VO1.00.

The design of hybrid materials based on magnetic Fe3O4 nanoparticles and luminescent CdS nanoparticles for cell visualization

Precipitation of crystalline ZrC in the surface region of dilute ZrC–NbC solid solutions (<1.0 mol % ZrC) was revealed by electron microscopy, x-ray microanalysis, laser mass spectrometry, and x-ray diffraction. The ZrC precipitation was shown to be a consequence of the diffusional decomposition of the dilute Zr1 – xNbxC solid solutions. The boundaries of the solid-miscibility gap in the ZrCy–NbCy system were calculated. The segregation energy of zirconium carbide was estimated at –33.3 kJ/mol.

Formation of CdS nanoparticles in the matrix of silicate glass and its optical properties

Silver sulfide (Ag2S) nanoparticles synthesized using different precursors have been characterized by dynamic light scattering measurements and high-resolution transmission electron microscopy. In addition to Ag2S nanoparticles, we have detected Ag2S/Ag heterostructures. Using optical microscopy, we have examined interaction of the nanoparticles with red cells of peripheral blood. The results of the interaction have been shown to depend on the particle size and charge. A red cell solution containing large, negatively charged particles coagulated, whereas small, positively charged Ag2S nanoparticles were concentrated around red cells.