Synthesis of CdS/L-cys nanoparticles colloid solutions with predetermined optical properties

The purpose of this paper is to summarize experimental data of CdS/L-cystein nanoparticles (NPs) colloid solutions optical properties as function of 3-component mixture (Cd2+–S2 –L-cys) content. The NPs synthesis was carried out at pH 11 in the wide composition range based on literature data. The influence of the solutions composition on the colloids stability and the CdS/l-cys NPs size was monitored by absorption and fluorescence spectra observation at room temperature and studied by TEM. A polynomial model was used for the responses produced from Scheffe’s simplex lattice design with fourth degree terms. The paper also compares the results of two statistical-experimental methods, namely 2D Scheffe’s simplex-lattice design and 3D-plot by STATISTICA v6 program. Both models were found to be adequate for prediction the optical properties of the solutions but with various approximation level

Synthesis of CdS/L-cys nanoparticles colloid solutions with predetermined optical properties

The purpose of this paper is to summarize experimental data of CdS/L-cystein nanoparticles (NPs) colloid solutions optical properties as function of 3-component mixture (Cd2+–S2 –L-cys) content. The NPs synthesis was carried out at pH 11 in the wide composition range based on literature data. The influence of the solutions composition on the colloids stability and the CdS/l-cys NPs size was monitored by absorption and fluorescence spectra observation at room temperature and studied by TEM. A polynomial model was used for the responses produced from Scheffe’s simplex lattice design with fourth degree terms. The paper also compares the results of two statistical-experimental methods, namely 2D Scheffe’s simplex-lattice design and 3D-plot by STATISTICA v6 program. Both models were found to be adequate for prediction the optical properties of the solutions but with various approximation levels

New Computer System for Recognizing Micro- and Nano-Sized Objects in Semiconductors and Colloidal Solutions

In this paper it is describe a new approach developed for recognizing micro- and nano-sized objects and a method for quantitative analysis of these objects. For this purpose was developed the automated systems that can simplify and accelerate the process of nanoparticle tracks analysis under the microscope whereby engineers and scientists are able to recognize the structures of defects in semiconductor wafers, along with nanoparticles and other microscopic objects. This capability is important to both select appropriate crystals and also to apply the data to improve the production process

Incorporation of Nanoparticles into Inorganic Salt Crystals (review)

This article provides an overview of the literature data on the incorporation of nanoparticles into crystals of inorganic salts, particularly alkali metal halides, potassium dihydrogen phosphate and others. The description of methods of obtaining composite crystals salt:nanoparticles, their properties and practical application are overviewed. It is shown that the process of incorporation of nanoparticles into the matrix depends on many factors, so systematic study of the effect of various parameters on its course and efficiency remains actual problem.Keywords: nanoparticles, quantum dots, inorganic matrixes.</p

New Computer System for Recognizing Micro- and Nano-Sized Objects in Semiconductors and Colloidal Solutions

In this paper it is describe a new approach developed for recognizing micro- and nano-sized objects and a method for quantitative analysis of these objects. For this purpose was developed the automated systems that can simplify and accelerate the process of nanoparticle tracks analysis under the microscope whereby engineers and scientists are able to recognize the structures of defects in semiconductor wafers, along with nanoparticles and other microscopic objects. This capability is important to both select appropriate crystals and also to apply the data to improve the production process

Magnetite and maghemite nanocrystals: variation of synthesis and stabilization conditions

The effect of synthesis, growth, and stabilization conditions (temperature, heat treatment duration, concentration and ratios of ions) on characteristics of magnetite and maghemite particles have been studied. The influence of the synthesis conditions on the magnetite nanoparticle surface character has been investigated. The magnetic properties of colloid solutions have been characterized.Вивчено вплив умов синтезу, росту і стабілізації на характеристики частинок магнетиту та магеміту: температури, тривалості термічної обробки, концентрації та співвідношення іонів. Досліджено впливу умов синтезу на характер поверхні наночастинок магнетиту. Охарактеризовано магнітні властивості колоїдних розчинів.Изучено влияние условий синтеза, роста и стабилизации на характеристики частиц магнетита и магемита: температуры, времени термообработки, концентрации и соотношения ионов. Исследовано влияние условий синтеза на характер поверхности наночастиц магнетита. Охарактеризованы магнитные свойства коллоидных растворов

Effect of pH of Synthesis on CdS/L-cys Colloidal Solutions Optical Properties

The purpose of this paper is to summarize experimental data of CdS/L-cystein nanoparticles (NPs) colloid solutions optical properties as function of 3-component mixture (Cd2+ – S2- – L-cys) content and pH. The NPs synthesis was carried out at pH=7, 9 and 11 in the wide composition range based on literature data. The influence of the solutions composition on the colloids stability and the CdS/L-cys NPs size was monitored by absorption and fluorescence spectra observation at room temperature and studied by TEM. A polynomial model was used for the responses produced from Scheffe’s simplex lattice design with fourth degree terms. Keywords: nanoparticles, CdS/L-cystein, absorption spectra, photo luminescence, quantum yield, mathematic experiments planning, simplex-lattice analyses.</span

Synergetic Radical-Scavenging effect in the complex of copper(II) with the thiosemicarbazone of Salicylaldehyde

The radical scavenging activities of salicylaldehyde thiosemicarbazone and its copper(II) and cadmium(II) complexes were evaluated by in vitro experiments in the reaction with 2,2'-diphenyl-1-picrylhydrazyl. Salicylic aldehyde thiosemicarbazone complex with Cu(II) shows significantly higher radical-scavenging activity than Cu2+ ions, salicylaldehyde thiosemicarbazone, and Cd(II) complex. Electrochemical, EPR and kinetic studies revealed that the high rate of reaction and efficiency is due to the mechanism of electron transfer, which is enhanced by the synergetic effect of the ligand structure and the ability of the copper ion to exhibit variable valencies.</p