scholarly journals Исследование кинетики гибели неравновесных носителей заряда в четверных соединениях меди Cu-=SUB=-2-delta-=/SUB=-NiSnS-=SUB=-4-=/SUB=- (0≤delta≤0.2)

2021 ◽  
Vol 55 (12) ◽  
pp. 1176
Author(s):  
М.В. Гапанович ◽  
Е.В. Рабенок ◽  
Б.И. Голованов ◽  
Д.М. Седловец ◽  
Г.Ф. Новиков
Keyword(s):  
Crystal Lattice ◽  
Solid Phase Synthesis ◽  
Solid Phase ◽  
Time Resolved ◽  
Phase Synthesis ◽  
Recombination Processes ◽  
Bimolecular Recombination ◽  
The Times ◽  
First Time ◽  
Kinetics Of

By solid-phase synthesis from elemental Cu, Ni, Sn, and S samples Cu2 - δNiSnS4 was prepared . The parameters of their crystal lattice have been refined. The lifetimes of photogenerated current carriers in Cu2 - δNiSnS4 were estimated for the first time by the contactless time-resolved microwave photoconductivity method. This times turned out to be τ ≈ 7 ns, which is comparable with the literature data for the times in kesterites CZTS. Herewith, in kinetics of loses of photogenerated cureent carriers is observed predominance of bimolecular recombination processes over capture processes.

scholarly journals Decorative coatings based on the processing of fine waste crushing concrete scrap

2018 ◽  
Vol 196 ◽  
pp. 04048
Author(s):  
Evgeniya Tkach ◽  
Kanapiya Nurbaturov ◽  
Askar Kulibayev
Keyword(s):  
Solid Phase Synthesis ◽  
Solid Phase ◽  
Chemical Interaction ◽  
Drop Out ◽  
Phase Synthesis ◽  
New Compounds ◽  
Kinetics Of ◽  
Degree Of Filling ◽  
Indications For Use ◽  
Rational Range

Experiments were carried out to determine the rational range of the proportion of fillers from sand and the dropout of crushing concrete scrap as a replacement part of the cement to obtain colloidal cement glue and to assess the effect of fillers of different specific surface area and the degree of filling on the kinetics of the set of strength of the hardened stone. It is established that the composition of the concrete scrap crushing drop-out contains about 30% of non-hydrated Portland cement, which deter-mines its use as an active micro-filler in the production of fine cement sys-tems. According to its chemical composition, the elimination of crushing of concrete scrap from heavy concrete is presented in the form of com-pounds of oxide groups, which, as a result of the interaction, provide the process of solid-phase synthesis of new compounds and are not able to en-ter into chemical interaction with pigments, the color of which is deter-mined by the type and content of iron oxides, and therefore has no contra-indications for use in decorative thin-milled cement systems.

scholarly journals Твердофазные реакции и фазовые превращения в наноразмерной пленочной структуре висмут/селен

2018 ◽  
Vol 52 (8) ◽  
pp. 823
Author(s):  
В.Я. Когай ◽  
Г.М. Михеев
Keyword(s):  
Heat Treatment ◽  
Phase Transformation ◽  
Phase Transformations ◽  
Solid Phase Synthesis ◽  
Solid Phase ◽  
Film Structure ◽  
Phase Synthesis ◽  
Crystallite Sizes ◽  
Solid Phase Reactions ◽  
First Time

AbstractExperimental results of a study concerned with solid-phase reactions and phase transformations in a Bi/Se nanoscale film structure under heat treatment in vacuum are presented. Nanocrystalline Bi2Se3, BiSe, and Bi_4Se_3 films are obtained for the first time by solid-phase synthesis at various ratios between the Bi and Se layer thicknesses. The phase-transformation temperatures at which Se, BiSe, and Bi4Se3 crystalline phases are formed are determined. The average crystallite sizes in the Bi_2Se_3, BiSe, and Bi_4Se_3 films are found to be 21, 23, and 33 nm, respectively.

Kinetics of Intrinsic and Dopant-Enhanced Solid Phase Epitaxy in Buried Amorphous Si Layers

1996 ◽  
Vol 439 ◽  
Author(s):  
J. C. McCallum
Keyword(s):  
Ion Implantation ◽  
Dopant Concentration ◽  
Solid Phase ◽  
Solid Phase Epitaxy ◽  
Entire Concentration Range ◽  
Time Resolved ◽  
Amorphous Si ◽  
First Time ◽  
Kinetics Of ◽  
Suitable Environment

AbstractThe kinetics of intrinsic and dopant-enhanced solid phase epitaxy (SPE) have been measured in buried amorphous Si (a-Si) layers produced by ion implantation. Buried a-Si layers formed by self-ion implantation provide a suitable environment for studies of the intrinsic growth kinetics of amorphous Si, free from the rate-retarding effects of H. For the first time, dopant-enhanced SPE rates have been measured under these H-free conditions. Buried a-Si layers containing uniform As concentration profiles ranging from 1–16.1 × 1019 As.cm−3 were produced by multiple-energy ion implantation and time resolved reflectivity was used to measure SPE rates over the temperature range 480–660°C. In contrast to earlier studies, the dopant-enhanced SPE rate is found to depend linearly on the As concentration over the entire concentration range measured. The SPE rate can be expressed in the form, v/vi(T) = 1 + N/[No exp(-ΔE/kT)], where vi(T) is the intrinsic SPE rate, N is the dopant concentration and No = 1.2 × 1021 cm−3, ΔE = 0.21 eV.

A Different Approach to the EGFR Inhibitor Gefitinib Involving Solid-Phase Synthesis

Synlett ◽  
2018 ◽  
Vol 29 (10) ◽  
pp. 1346-1350 ◽  
Author(s):  
Luísa Carvalho ◽  
André Sequeira ◽  
Ana Lourenço ◽  
Luísa Ferreira ◽  
Paula Branco ◽  
...  
Keyword(s):  
Solid Phase Synthesis ◽  
Solid Phase ◽  
Solid Support ◽  
Egfr Inhibitor ◽  
Phase Synthesis ◽  
Synthetic Strategy ◽  
Colorimetric Assays ◽  
First Time ◽  
Synthesis Approach

An efficient solid-phase synthesis approach is here reported for the first time to prepare the EGFR inhibitor Gefitinib. The five-step synthetic strategy used FMP resin as the solid support, and FTIR and colorimetric assays were used to track the reaction’s progress. Gefitinib was obtained with an overall yield of 40%.

Effect of Mn Doping on Magnetic and Dielectric Properties of Bi2Sn2O7

2015 ◽  
Vol 233-234 ◽  
pp. 105-108 ◽  
Author(s):  
Lubov V. Udod ◽  
Sergey S. Aplesnin ◽  
Maxim N. Sitnikov ◽  
Evgenii V. Eremin ◽  
Maxim S. Molokeev
Keyword(s):  
Electrical Resistance ◽  
Solid Phase Synthesis ◽  
Solid Phase ◽  
Phase Synthesis ◽  
Martensitic Phase Transitions ◽  
Polymorphic Modifications ◽  
Temperature Dependences ◽  
Magnetic And Dielectric Properties ◽  
First Time ◽  
Magnetic Dielectric

The Bi2(Sn0.95Mn0.05)2O7 compound existing simultaneously in two polymorphic modifications, namely, orthorhombic and cubic has been synthesized for the first time by solid-phase synthesis. The magnetic, dielectric and electrical properties of the compound have been studied. Anomalies in the temperature dependences of the electrical resistance and magnetic propoties have been found. These features are explained as martensitic phase transitions.

Kinetics of the solid-phase synthesis of mullite in the presence of topaz

2005 ◽  
Vol 46 (1) ◽  
pp. 49-55
Author(s):  
T. V. Vakalova ◽  
A. V. Ivanchenkov ◽  
V. M. Pogrebenkov
Keyword(s):  
Solid Phase Synthesis ◽  
Solid Phase ◽  
Phase Synthesis ◽  
Kinetics Of

Kinetics of Intrinsic and Dopant-Enhanced Solid Phase Epitaxy in Buried Amorphous Si Layers

1996 ◽  
Vol 438 ◽  
Author(s):  
J. C. McCallum
Keyword(s):  
Ion Implantation ◽  
Dopant Concentration ◽  
Solid Phase ◽  
Solid Phase Epitaxy ◽  
Entire Concentration Range ◽  
Time Resolved ◽  
Amorphous Si ◽  
First Time ◽  
Kinetics Of ◽  
Suitable Environment

AbstractThe kinetics of intrinsic and dopant-enhanced solid phase epitaxy (SPE) have been measured in buried amorphous Si (a-Si) layers produced by ion implantation. Buried a-Si layers formed by self-ion implantation provide a suitable environment for studies of the intrinsic growth kinetics of amorphous Si, free from the rate-retarding effects of H. For the first time, dopant-enhanced SPE rates have been measured under these H-free conditions. Buried a- Si layers containing uniform As concentration profiles ranging from 1–16.1 × 1019 As.cm-3 were produced by multiple-energy ion implantation and time resolved reflectivi[ty was used to measure SPE rates over the temperature range 480–660°C. In contrast to earlier studies, the dopant-enhanced SPE rate is found to depend linearly on the As concentration over the entire concentration range measured. The SPE rate can be expressed in the form, v/vi(T) = 1 + N/[No exp(−Λ E/kT)], where vi(T) is the intrinsic SPE rate, N is the dopant concentration and No = 1.2 × 1021 cm-3, ΔE = 0.21 eV.

PREPARATION AND CHARACTERIZATION OF ELECTRIC ZAO NANOPARTICLES

NANO ◽  
2010 ◽  
Vol 05 (04) ◽  
pp. 215-220 ◽  
Author(s):  
HAO-WEI SHI ◽  
HONG-ZHEN XIE ◽  
JIN-KU LIU ◽  
YAN WANG
Keyword(s):  
Seed Germination ◽  
Root Growth ◽  
Solid Phase Synthesis ◽  
Solid Phase ◽  
Synthesis Method ◽  
Strong Inhibition ◽  
Phase Synthesis ◽  
White Good ◽  
First Time

The white good dispersion zinc aluminium oxide (ZAO) nanoparticles were efficiently prepared by solid phase synthesis method. The morphologies, structures, photoelectricity of the ZAO nanoparticles and the thermochemistry behavior of the precursor were analyzed by TEM, XRD, UV-vis and TG, etc. The phytotoxicity properties of the ZAO nanoparticles were researched for the first time. The results show that the ZAO nanoparticles have a strong inhibition of seed germination and root growth. The biological toxicity of ZAO nanoparticle reduces along with the enlargement of nanoparticle size.

scholarly journals Practical synthesis of N-(di-n-butylamino)methylene-protected 2-aminopurine riboside phosphoramidite for RNA solid-phase synthesis

2019 ◽  
Vol 150 (11) ◽  
pp. 1941-1946
Author(s):  
Eva Neuner ◽  
Ronald Micura
Keyword(s):  
Solid Phase Synthesis ◽  
Solid Phase ◽  
Building Blocks ◽  
Fluorescence Signal ◽  
Phase Synthesis ◽  
Structure Sensitive ◽  
Practical Synthesis ◽  
External Stimuli ◽  
Kinetics Of ◽  
Methylene Group

Abstract 2-Aminopurine (Ap) is a fluorescent nucleobase analog that is frequently used as structure-sensitive reporter to study the chemical and biophysical properties of nucleic acids. In particular, thermodynamics and kinetics of RNA folding and RNA–ligand binding, as well as RNA catalytic activity are addressable by pursuing the Ap fluorescence signal in response to external stimuli. Site-specific incorporation of Ap into RNA is usually achieved by RNA solid-phase synthesis and requires appropriately functionalized Ap riboside building blocks. Here, we introduce a robust synthetic path toward a 2-aminopurine riboside phosphoramidite whose N2 functionality is masked with the N-(di-n-butylamino)methylene group. This protection is considered advantageous over previously described N-(dimethylamino)methylene or acyl protection patterns needed for the fine-tuned deprotection conditions to achieve large synthetic RNAs. Graphic abstract

KINETICS OF THE CATALYTIC DEHYDROAROMATIZATION OF METHANE

2020 ◽  
Author(s):  
B.Sh. Shukurov ◽  
S.R. Nuraliev
Keyword(s):  
Methane Conversion ◽  
Solid Phase Synthesis ◽  
Solid Phase ◽  
Phase Synthesis ◽  
Methane Dehydroaromatization ◽  
Subsequent Calcination ◽  
Kinetics Of

In this work, the effect of various factors on methane conversion, the selectivity and yield of the products of the methane dehydroaromatization reaction were studied. The methane dehydroaromatization catalyst 5% Mo/Bentonite was prepared by solid-phase synthesis by mixing bentonite with MoO3 and subsequent calcination and activation

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