Magnetism of Kesterite CuZnSnS Semiconductor Nanopowders Prepared by Mechanochemically Assisted Synthesis Method.

High energy ball milling is used to make first the quaternary sulfide CuZnSnS raw nanopowders from two different precursor systems. The mechanochemical reactions in this step afford cubic pre-kesterite with defunct semiconducting properties and showing no solid-state Cu and Sn MAS NMR spectra. In the second step, each of the milled raw materials is annealed at 500 and 550 °C under argon to result in tetragonal kesterite nanopowders with the anticipated UV-Vis-determined energy band gap and qualitatively correct NMR characteristics.

Magnetic polymer microcapsules loaded with Nile Red fluorescent dye.

Fabrication of multifunctional smart vehicles for drug delivery is a fascinating challenge of multidisciplinary research at the crossroads of materials science, physics and biology. We demonstrate a prototypical microcapsule system that is capable of encapsulating hydrophobic molecules and at the same time reveals magnetic properties. The microcapsules are prepared using a templated synthesis approach where the molecules to be encapsulated (Nile Red) are present in the organic droplets that are suspended in the polymerization solution which also contains magnetic nanoparticles.

Magnetic-nanoparticle-decorated polypyrrole microvessels: toward encapsulation of mRNA cap analogues.

Many phosphorylated nucleoside derivatives have therapeutic potential, but their application is limited by problems with membrane permeability and with intracellular delivery. Here, we prepared polypyrrole microvessel structures modified with superparamagnetic nanoparticles for use as potential carriers of nucleotides. The microvessels were prepared via the photochemical polymerization of the monomer onto the surface of aqueous ferrofluidic droplets.

Dinuclear mesogens with antiferromagnetic properties.

Herein, two new groups of isomeric bimetallic nickel(II) and copper(II) complexes containing pyrazine or pyrimidine rings are synthesized and examined. The complexes exhibit liquid-crystalline columnar phases in a broad temperature range. For the copper(II) complexes, super-exchange coupling between two Cu(II) ions is observed.

Ferromagnetic spins interaction in poly(m-p-aniline).

Alternating poly(m-p-aniline) can be oxidized to radical cations with spins S = 1/2. For high spin density, ferromagnetic spin interaction is observed, and some of the generated radical cations are found to be in a ground triplet state.

High-spin radical cations of alternating poly(m-p-anilines).

Three alternating poly(m-p-anilines) have been synthesized via palladium-catalyzed amination reactions. Polymers were oxidized to radical cations by the use of chemical and electrochemical methods. The presence of radical cations was manifested by the appearance of two new bands in UV-vis spectra and a strong EPR signal.

[Factors influencing prophylaxis of caries and teeth treatment in children with mild mental retardation].

The analysis indicated factors affecting caries prophylaxis and teeth treatment in children with mild mental retardation. The factors were sought in the personality of the child, its family environment and the work of the dentist. A significant effect on the cooperation of the dentist with the patient was exerted by such factors as the level of anxiety before dental procedure, motivation to treatment, intensity of teaching of oral hygiene, life period when teaching was started, frequency of teethbrushing, regular contacts with the dentist, and the mode of child reception by the dentist.