Two new photoreactive biotin derivatives, N-(2-nitro-5-azidobenzoyl)-N′-(d-biotinyl)-1,4-diaminobutane (I) and N-(4-azidophenyl)-N′-(d-biotinyl)-1,4-diaminobutane (II), have been synthesized and used for a photoaffinity labelling of streptavidin at a molar ratio of 1:1 reagent to streptavidin ...

Biologically active photoaffinity labeled analogues of taxol (6, 8 and 9) have been synthesized utilizing (3R,4S)-3-hydroxy-4-phenyl-2-azetidinones, produced via the ester enolate-imine cyclocondensation reaction, and the diterpene baccatin III (2). Photoaffinity label 8 proved to be the most ac...

A water-soluble, cleavable, heterobifunctional photoaffinity label has been synthesized in one step from N-hydroxysuccinimidyl 4-azidobenzoate and cystine. The resultant compound, N,N′-bis(4-azidobenzoyl) cystine [(ABC)2], reacts with protein sulfhydryl groups through disulfide exchange to gene...

The process of high-temperature oxidation of EuS in the air was exploored in the temperature range of 500-1000 °C. The oxidation reaction enthalpy was determined (ΔH0exp=―1718.5 kJ/mol). The study of oxidation products allowed to establish the mechanism of EuS oxidation with oxygen. At 500-60...

The research field of persistent luminescence has experienced a strong growth in the past two decades, with a steady development of new materials and applications. Here we give an overview of the recent progress in a specific class of host materials, namely oxynitride and nitride persistent phos...

Nanocrystalline rare earth nitrides (EuN and YbN) were successfully prepared by the thermal decomposition of amides (Eu(NH2)2, Yb(NH2)2 and Yb(NH2)3). The formation processes of nanocrystalline nitrides were characterized by X-ray diffraction analysis (XRD) combined with temperature-programmed d...

Luminescent thin films were fabricated on silicon wafers using reactive magnetron sputtering of Ca, Si and Eu in Ar/N2 atmosphere. In order to activate the luminescence, the as-deposited nitride films were heated to 1100 °C by a rapid thermal processing treatment. X-ray diffraction measurements...

Specialized applications of spintronics devices have attracted much attention as an economical substitute for conventional magnetic recording technology. In this work, we performed ab-inito calculations for rare earth nitride EuN doped with 5% of (Ti, V, Cr and Co) using density functional theor...

AlGaN/GaN-superlattice based diode structures under study were grown by metal organic chemical vapour deposition, then implanted with two different Eu ion beam fluences, and further submitted to high temperature and high pressure thermal annealing treatments. The effects of Eu implantation and a...

Luminescence and absorption spectra of nanostructured carbon nitride (CNx)-films doped by EuCl3 were studied. It was found that the films with europium concentration equal to 4.5 at% and 10 at% placed on the glass substrate exhibit a luminescence spectrum specific to the EuCl3 compound but with ...

Europium-doped graphitic carbon nitride was synthesized by an easy method and characterized by X-ray diffraction (XRD), ultraviolet-visible diffuse reflection spectroscopy (UV-Vis DRS), Fourier transform infrared spectroscopy (FTIR), photoluminescence spectra (PL) and transmission electron micro...

Divalent europium(II)-doped mesoporous silicon oxy-nitride materials, as a novel type of nanoscopic photoluminescent material, are studied in which the optically active luminescent centers are isolated within the pores. Colorless and transparent blue emitting luminous Eu2+-doped mesoporous silic...

We have synthesized AlN nanoparticles (NPs) doped in-situ with Er (AlN:Er) using inert gas condensation technique. Using x-ray diffraction (XRD) peak broadening analysis with the Williamson–Hall (W–H) Uniform Deformation Model (UDM) the crystallite size of the NPs and the strain in NPs were fo...

In this paper, we discuss optical emission, energy transfer and electroluminescence from a superlattice structure containing small (∼2 nm diameter) amorphous silicon (Si) clusters coupled to erbium (Er) ions. The superlattice structure is fabricated by direct co-sputtering of thin (∼3–5 nm) E...

Gallium nitride (GaN) crystals doped with erbium were grown via the ammonothermal processes on hydride vapor phase epitaxy (HVPE) GaN seeds. The crystallization conducted in alkaline solutions of supercritical ammonia and potassium azide (KN3) at temperatures between 525 and 550 °C yielded grow...

A novel erbium chloride seeded growth process was developed for the growth and fabrication of erbium doped GaN nanocrystals. This erbium chloride seeded technique simplifies the delivery of erbium into a metal organic chemical vapor deposition system. Additionally, this selective growth of the G...

This paper presents a thorough experimental investigation of erbium-doped aluminium nitride thin films prepared by R.F. magnetron sputtering, coupling Scanning Transmission Electron Microscopy X-ray-mapping imagery, conventional Transmission Electron Microscopy and X-ray diffraction. The study i...

Grain boundaries are the elementary carriers of mechanical stress and chemical transport in polycrystalline materials. They are responsible for most macroscopic properties of them, particularly the mechanical performance. Most models take into account the ability of grain boundaries to slide eac...

This article is devoted to the study of zirconium carbide angle of wettability. An experiment to determine the angle of wettability was carried out in two different ways, being contact and contactless. In the conclusion of the experiment we examined the microstructure of the obtained contact are...

In this study, nano zirconium carbide (n-ZrC) was synthesized by preceramic polymers method, and it was used to adsorb emodin and physcion from solutions for the first time. The prepared material was characterized by various technologies. The adsorption experiment was carried out to investigate ...