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.

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

Obtaining and Trademark of Copper Molybdenum Oxide from the CuMoO4 Sample Using Carbon as a Reducing Agent

2015 ◽  
Vol 1105 ◽  
pp. 154-158
Author(s):  
Akbota B. Alkenova ◽  
Aristotel Z. Isagulov ◽  
K. Zhumashev ◽  
Alain Hazotte
Keyword(s):  
Activation Energy ◽  
Solid Phase Synthesis ◽  
Solid Phase ◽  
Chemical Interaction ◽  
Temperature Synthesis ◽  
Phase Synthesis ◽  
Interaction Processes ◽  
Dta Curve ◽  
Energy Quantity ◽  
Energy Activation

This article discusses the calculation of the apparent activation energy (CuMoO4 + C) on the DTA curve, to study and optimize the time-temperature synthesis mode, in particular the activation energy. Activation energy allows us to investigate the elementary act of chemical interaction. Thus, we propose to use this method to calculate Eact interaction processes (CuMoO4 + C) in the solid phase synthesis occurring during the reinforcement. The research results are checked by thermodynamic calculations. The results obtained allow us to trace the energy quantity expended to start the reaction.

scholarly journals Preparation and supporting on solid phase of chiral auxiliary (S)-4-(4hydroxybenzyl)oxazolidin-2-one from L-tyrosinol assisted by Microwaves

2019 ◽  
Vol 53 (3) ◽  
Author(s):  
Adriana Cruz ◽  
Ignacio A. Rivero
Keyword(s):  
Mass Spectrometry ◽  
Infrared Spectroscopy ◽  
Solid Phase Synthesis ◽  
Solid Phase ◽  
Chiral Auxiliary ◽  
Microwave Activation ◽  
Chiral Auxiliaries ◽  
1H And 13C Nmr ◽  
Phase Synthesis ◽  
New Compounds

An oxazolidinone chiral auxiliary, (S)-(4-Hydroxybenzyl)1,3-oxazolidin-2-one 4 was prepared in 23-80 % yield from L-tyrosinol using different methodologies. In solution, compound 4 was protected with a benzyl group on the phenolic hydroxyl 5a, which allowed the optimization of the solid phase synthesis of 5b-5d. Chiral auxiliaries 5a and 5b reacted in solution with an α,β-unsaturated system to give (S)-4-(4-(benzyloxy)benzyl)-1,3-oxazolidin-2-one 6a. By contrast, in solid phase the same reaction afforded 6b. Both reactions were carried out under microwave activation. New compounds were characterized by 1H and 13C NMR, infrared spectroscopy and mass spectrometry.

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

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.

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