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. © 2013 Springer Science+Business Media New York

Thermal expansion of a lead sulfide nanofilm

The thermal expansion of a lead sulfide nanofilm produced by chemical bath deposition was determined by X-ray diffraction (XRD). The thickness of the synthesized film was about 100 nm, and the average size of the coherent scattering regions as determined from XRD was about 40 nm. The lattice constant of the PbS nanofilm was measured as a function of the annealing temperature from 293 to 473 K and as a function of the annealing time at a constant temperature of 423 K. The thermal expansion coefficient derived was found almost twice as large as that for coarse-grained PbS. © 2013 Elsevier B.V. All rights reserved. All rights reserved

Кинетика химического осаждения сульфида цинка ZnS

The paper is devoted to kinetic methods of chemical bath deposition of zinc sulfide ZnS from aqueous alkaline solutions containing ehylenediamine complex zinc salt Zn(En)n 2+ and diamide of thiocarbonic acid N2H4CS. It is established that the rate of formation of ZnS is weakly dependent on pH, depends on the concentration of the precipitant ((N2H4CS) and decreases with increasing concentration of ligand (ethylenediamine). The calculation of the theoretical curves on the experimentally obtained kinetic equation shows a satisfactory description of experimental data that allows to recommend it to calculate the rate of formation of ZnS in aqueous alkaline solutions of N2H4CS.Работа посвящена исследованию кинетическими методами химического осаждения сульфида цинка ZnS из водных щелочных растворов, содержащих этилендиаминовую комплексную соль цинка Zn(En)n 2+ и диамид тиоугольной кислоты N2H4CS. Установлено, что скорость образования ZnS слабо зависит от величины рН, зависит от концентрации осадителя (N2H4CS) и уменьшается с увеличением концентрации лиганда (этилендиамина). Расчет теоретических кривых по полученному экспериментально кинетическому уравнению показывает удовлетворительное описание полученных экспериментальных данных, что позволяет рекомендовать его для расчета скорости образования ZnS в водных щелочных растворах N2H4CS.This work was done under financial support from RFBR (Project 16-03-00566).Работа выполнена при финансовой поддержке РФФИ (Проект № 16-03-00566)

Synthesis of Roxbyite Cu58S32 Thin Solid Films

This work was supported by the Government of the Russian Federation (program 211, project # 02.A03.21.0006) and by the state assignment for the Institute of Solid State Chemistry UB RAS

Positron annihilation sites in nano lead sulfide powders

The coincident Doppler broadening of the positron-electron annihilation radiation has been applied for the identification of vacancies in nano lead sulfide (nano-PbS) powders. The results of the positron annihilation studies on nano-PbS with different particle size are presented. Nano-PbS specimens have been synthesized by the chemical bath deposition in aqueous medium. Independently of the size of nanoparticles (from 12 to 16 nm) the positron lifetime (PLT) for all specimens has been found to be the same and equal to 391±1 ps. Independently of the size of nanoparticles the chemical surrounding of positron annihilation sites identified by coincident Doppler broadening measurements was the same, namely lead (Pb).Canberra;Orte

Practical recommendations for university graduates’ readiness formation to occupational mobility

© 2016 Yakhina et al.The research urgency is caused by the development of economic integration and demand for professionals able to adapt to constantly changing working conditions. The purpose of the paper is to develop practical recommendations on formation of University graduates’ readiness to occupational mobility. A leading approach to the study is the structural-functional approach allowing revealing of the nature and structure of occupational mobility, to identify the pedagogical conditions of formation of University graduates’ readiness to professional mobility. The study involved 300 teachers, 450 students who took part in characterizing levels of readiness for occupational mobility and definition of its criteria. Main results of the research consist of the identification of core components of occupational mobility (axiological, epistemological, praxeological) and pedagogical conditions of formation of University graduates’ readiness to occupational mobility (formation of occupational value orientations of students; the modular structure of educational process; organization of project-based learning), identifying of levels of readiness for occupational mobility (high, average, low) and the criteria (motivational, cognitive, activity-related). The significance of the results obtained is that the identified components of occupational mobility allow us to consider it as an integrative quality of the personality of the specialist, which characterizes the readiness for rapid and successful acquisition of new activities. Identified pedagogical conditions of formation of University graduates’ readiness for occupational mobility provide their focus on the active acquisition of the latest occupational achievements and expansion of the scope of activities, qualification enhancement and development of competitiveness. Levels of readiness for occupational mobility help to develop the ability to quickly mastering of new skills and changes in them arising under the influence of scientific, social and technical changes. Criteria of readiness for occupational mobility reflect the unity of fundamental knowledge, occupational competences and personal qualities

Chemical Bath Deposition of Cu2S Thin Films From Thiosulphate Solutions

Present work was executed with the financial support of the program 211 of the Government of the Russian Federation № 02.A03.21.0006

Кинетика химического осаждения сульфида цинка ZnS

The paper is devoted to kinetic methods of chemical bath deposition of zinc sulfide ZnS from aqueous alkaline solutions containing ehylenediamine complex zinc salt Zn(En)n2+ and diamide of thiocarbonic acid N2H4CS. It is established that the rate of formation of ZnS is weakly dependent on pH, depends on the concentration of the precipitant ((N2H4CS) and decreases with increasing concentration of ligand (ethylenediamine). The calculation of the theoretical curves on the experimentally obtained kinetic equation shows a satisfactory description of experimental data that allows to recommend it to calculate the rate of formation of ZnS in aqueous alkaline solutions of N2H4CS.Работа посвящена исследованию кинетическими методами химического осаждения сульфида цинка ZnS из водных щелочных растворов, содержащих этилендиаминовую комплексную соль цинка Zn(En)n2+ и диамид тиоугольной кислоты N2H4CS. Установлено, что скорость образования ZnS слабо зависит от величины рН, зависит от концентрации осадителя (N2H4CS) и уменьшается с увеличением концентрации лиганда (этилендиамина). Расчет теоретических кривых по полученному экспериментально кинетическому уравнению показывает удовлетворительное описание полученных экспериментальных данных, что позволяет рекомендовать его для расчета скорости образования ZnS в водных щелочных растворах N2H4CS

NANOCRYSTALLINE CuS(II) SYNTHESIZED BY CHEMICAL BATH DEPOSITION

Nanocrystalline CuS was precipitated by using Na2S and thiocarbonic acid diamide N2H4CS and characterized by XRD analysis.Работа выполнена при финансовой поддержке Российского фонда фундаментальных исследований (Проект № 16-03-00566)