Plasma-chemical synthesis of YBa2Cu3O7–y / CuO granular composites

2021 ◽  
pp. 32-37
Author(s):  
Igor Karpov ◽  
◽  
Anatoly Ushakov ◽  
Leonid Fedorov ◽  
Lylya Irtyugo ◽  
...  
Keyword(s):  
Chemical Synthesis ◽  
Solid Phase Synthesis ◽  
Solid Phase ◽  
Chemical Reactor ◽  
Reaction Chamber ◽  
Plasma Chemical ◽  
Plasma Chemical Reactor ◽  
Phase Synthesis ◽  
Pinning Centers ◽  
Granular Composites

The possibility of synthesizing HTSC ceramics in the reaction chamber of a plasma-chemical reactor is shown. The method allows one to significantly reduce the process of solid-phase synthesis and obtain modified HTSC ceramics with a given content of non-superconducting additives that act as pinning centers.

scholarly journals Postsynthetic On-Column 2′ Functionalization of RNA by Convenient Versatile Method

2020 ◽  
Vol 21 (14) ◽  
pp. 5127
Author(s):  
Olga A. Krasheninina ◽  
Veniamin S. Fishman ◽  
Alexander A. Lomzov ◽  
Alexey V. Ustinov ◽  
Alya G. Venyaminova
Keyword(s):  
Chemical Synthesis ◽  
Physicochemical Properties ◽  
Functional Groups ◽  
Convenient Method ◽  
Solid Phase Synthesis ◽  
Solid Phase ◽  
Protecting Groups ◽  
Hydroxyl Group ◽  
Phase Synthesis ◽  
Wide Range

We report a universal straightforward strategy for the chemical synthesis of modified oligoribonucleotides containing functional groups of different structures at the 2′ position of ribose. The on-column synthetic concept is based on the incorporation of two types of commercial nucleotide phosphoramidites containing orthogonal 2′-O-protecting groups, namely 2′-O-thiomorpholine-carbothioate (TC, as “permanent”) and 2′-O-tert-butyl(dimethyl)silyl (tBDMS, as “temporary”), to RNA during solid-phase synthesis. Subsequently, the support-bound RNA undergoes selective deprotection and follows postsynthetic 2′ functionalization of the naked hydroxyl group. This convenient method to tailor RNA, utilizing the advantages of solid phase approaches, gives an opportunity to introduce site-specifically a wide range of linkers and functional groups. By this strategy, a series of RNAs containing diverse 2′ functionalities were synthesized and studied with respect to their physicochemical properties.

Research of Formation Plasma-Chemical Process Particles of Oxides Metals with Specified Morphology

2015 ◽  
Vol 1085 ◽  
pp. 34-37
Author(s):  
Elena V. Obkhodskaya ◽  
Victor I. Sachkov ◽  
Alexander S. Buynovskiy ◽  
Elena M. Knyazeva
Keyword(s):  
Chemical Synthesis ◽  
Chemical Process ◽  
Chemical Reactor ◽  
Solid Particles ◽  
Droplet Volume ◽  
Kinetic Characteristics ◽  
Plasma Chemical ◽  
Plasma Chemical Reactor ◽  
Plasma Chemical Synthesis ◽  
Salt Diffusion

The results of studies to determine the parameters affecting the morphology of the particle formation in certain conditions plasma chemical synthesis are present. On the example of oxides of cerium and yttrium were determined kinetic characteristics of plasmachemical process for their preparation, calculated characteristic times of the main stages occurring in the plasma-chemical reactor (t1, t2, t3, t4). Have been proposed parameter K0, characterizing the modes of hollow and solid particles formation and determining the process of salt diffusion in the droplet volume and solvent evaporate from the surface.

SOLID-PHASE SYNTHESIS: FROM REVOLUTION TO EVOLUTION

COSMOS ◽  
2008 ◽  
Vol 04 (01) ◽  
pp. 17-37 ◽  
Author(s):  
BRENDAN A. BURKETT
Keyword(s):  
Chemical Synthesis ◽  
Solid Phase Synthesis ◽  
Solid Phase ◽  
Chemical Research ◽  
Phase Synthesis ◽  
The World ◽  
The Face ◽  
Over Time

Solid-phase synthesis is a technique of synthesizing compounds that was first reported by R. Bruce Merrifield in 1963. This revolutionary way of performing chemical synthesis has changed the face of synthesis — yet few people outside the halls of chemical research will ever hear about it. So, what is this technique and why is it useful? How has the technique of solid-phase synthesis changed the world? How has the solid-phase synthesis changed over time? This article aims to give a background of the area of solid-phase synthesis and answer these questions.

Chemical Synthesis of Six‐Atom Thioether Bridged Diaminodiacid for Solid‐Phase Synthesis of Peptide Disulfide Bond Mimics

2020 ◽  
Vol 5 (4) ◽  
pp. 1359-1363 ◽  
Author(s):  
Junyou Chen ◽  
Shuaishuai Sun ◽  
Rui Zhao ◽  
Chen‐Peng Xi ◽  
Wenjie Qiu ◽  
...  
Keyword(s):  
Chemical Synthesis ◽  
Disulfide Bond ◽  
Solid Phase Synthesis ◽  
Solid Phase ◽  
Phase Synthesis

Preparation of nanostructured dysprosium titanate and study of its properties

2020 ◽  
Vol 4 ◽  
pp. 5-9
Author(s):  
N.V. Dedov ◽  
◽  
I.Yu. Rusakov ◽  
Yu.N. Tumanov ◽  
◽  
...  
Keyword(s):  
Solid Phase ◽  
Hollow Spheres ◽  
Chemical Reactor ◽  
Close Packing ◽  
Planetary Mill ◽  
Spherical Particles ◽  
Plasma Chemical ◽  
Plasma Chemical Reactor ◽  
Dysprosium Titanate ◽  
Average Size

Dysprosium titanate with an equimolar ratio of the oxides included in it was obtained by the plasma-chemical method from previously prepared mixed solutions of salt nitrates. The separation of the solid phase from the gas-vapor stream leaving the plasma-chemical reactor was carried out in vortex dust collectors. In all batches of the product, particles of the same morphological set were obtained, with a predominance of hollow spheres with an average size of 200 nm with crystallites of 10-60 nm in size included in them. Uniaxial pressing and subsequent grinding in a planetary mill, as well as electro-pulse dispersion, do not allow obtaining powders of the required dispersion and purity. To ensure close packing during pressing and sintering of powders, the destruction of gas-filled hollow spherical particles is required. For the destruction of spheres, methods have been developed for obtaining particles of the desired morphology directly in a plasma-chemical reactor, for example, a method for “explosive” dispersion of a powder in the process of plasma-chemical synthesis with the introduction of ammonium nitrate into the initial solution. The results of studies of the morphology, granulometric and phase composition of the obtained dysprosium titanate are presented.

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