Современные методы поиска научно-технической информации в области химии и смежных дисциплинах
Atom- and Step-Economical Ruthenium-Catalyzed Synthesis of Esters from Aldehydes or Ketones and Carboxylic Acids
, , et al., Organic Letters 2018 Vol. 20 No. 24 P. 7856-7859
We developed a ruthenium-catalyzed reductive ester synthesis from aldehydes or ketones and carboxylic acids using carbon monoxide as a deoxygenative agent. Multiple factors influencing the outcome of the reaction were investigated. Best results were obtained for commercially available and inexpensive benzene ruthenium chloride; as low as 0.5 mol % of the catalyst is sufficient for ...
Added: June 25, 2019
A competetive way to low-viscosity PAO base stocks via heterocene-catalyzed oligomerization of dec-1-ene
, , et al., MOLECULAR CATALYSIS 2022 Vol. 529 Article 112542
Hydrogenated oligomers of higher α-olefins (primarily, dec-1-ene) represent base stocks for high-quality polyolefin oils (PAOs), transmission fluids, lubricants and greases. Competitive advantages of zirconocene catalysts in oligomerization of α-olefins have been already demonstrated and industrially implemented for higher oligomers. However, the problem of the selective synthesis of α-olefin oligomers that have degree of polymerization (DPn) ...
Added: September 12, 2022
М. : РХТУ им. Д.И. Менделеева, 2020
УДК 66.01-52 ББК 24. 35 У78 Рецензент: Российский химико-технологический университет имени Д. И. Менделеева Успехи в химии и химической технологии: сб. науч. тр. Том XXXIV, У78 № 5 (228). – М.: РХТУ им. Д. И. Менделеева, 2020. – 110 с. В сборник вошли статьи по актуальным вопросам в области теоретической и экспериментальной химии. Материалы сборника представлены для широкого обсуждения на XVI Международном конгрессе молодых ученых ...
Added: August 5, 2022
, , Journal of the Brazilian Chemical Society 2021 Vol. 32 No. 2 P. 287-298
u-Co-containing cellulose-based carbon composite materials (Cu-Co/Cel) were formed by a matrix isolation method. Using X-ray diffraction (XRD), transmission electron microscopy (TEM), infrared-Fourier spectroscopy (IR-Fourier spectroscopy), and non-isothermal research methods, the physicochemical properties of the composites were established. The catalysts are nanosized particles distributed in a carbon matrix, containing fragments of a system of conjugated bonds ...
Added: February 18, 2022
Strong Antibacterial Properties of Cotton Fabrics Coated with Ceria Nanoparticles under High-Power Ultrasound
, , et al., Nanomaterials 2021 Vol. 11 No. 10 Article 2704
Flexible materials, such as fabric, paper and plastic, with nanoscale particles that possess antimicrobial properties have a significant potential for the use in the healthcare sector and many other areas. The development of new antimicrobial coating formulations is an urgent topic, as such materials could reduce the risk of infection in hospitals and everyday life. To select the ...
Added: October 23, 2022
Highly sensitive, stable and selective hydrogen peroxide amperometric biosensors based on peroxidases from different sources wired by Os-polymer: A comparative study.
, , et al., Solid State Ionics 2018 Vol. 314 P. 178-186
A comparison was made between two plant peroxidases, cationic horseradish peroxidase (HRP) and anionic tobacco peroxidase (TOP), combined with a highly cationic osmium polymer [Os(4,4′-dimethyl-2,2′-bipyridine)2poly(N-vinylimidazole)10Cl]+ 2/+ ([Os(dmp)PVI]+/2 +) to develop highly sensitive, stable and selective hydrogen peroxide biosensors. The two different plant peroxidases were individually immobilized onto graphite rod (G) electrodes by a three steps ...
Added: May 12, 2020
, М. : ЛЕНАНД, 2020
Within the presented monograph for the first time statistical approaches, based on the self-consistent field theory, were presented for the theoretical description of the thermodynamic properties of the ion-molecular systems (electrolyte solutions, ionic liquids, dielectric polymers and metal-organic frameworks) in the bulk solution and at the interfaces with the account for their molecular structure. In ...
Added: November 18, 2019
, Российский химико- техногогический университет им. Менделеева, 2012
В книге представлена информация по важнейшим эксплуатационным свойствам стекол, технологии их производства, перерабготки в изделия, методам разбраковки и контроля качкства. Авторы книги являются ведущими специалистами важнейших направлений науки о стекле, промышленной технологии производства материалов и изделий из стекла. ...
Added: October 2, 2022
, , et al., Chemical Reviews 2019 Vol. 119 No. 23 P. 11857-11911
Reductive amination plays a paramount role in pharmaceutical and medicinal chemistry owing to its synthetic merits and the ubiquitous presence of amines among biologically active compounds. It is one of the key approaches to C–N bond construction due to its operational easiness and a wide toolbox of protocols. Recent studies show that at least a ...
Added: August 5, 2020
Impregnation of Poly(methyl methacrylate) with Carbamazepine in Supercritical Carbon Dioxide: Molecular Dynamics Simulation
, , , Journal of Physical Chemistry B 2020 Vol. 124 No. 38 P. 8410-8417
Fully atomistic molecular dynamics simulations are employed to study impregnation of the poly(methyl methacrylate) (PMMA) matrix with carbamazepine (CBZ) in supercritical carbon dioxide. The simulation box consists of 108 macromolecules of the polymer sample with the polymerization degree of 100, 57 molecules of CBZ, and 242,522 CO2 molecules. The simulation is performed at 333 K and ...
Added: September 16, 2020
A tunable precious metal-free system for selective oxidative esterification of biobased 5-(hydroxymethyl)furfural
, , , Green Chemistry 2019 Vol. 21 P. 3464-3468
Oxidative esterification of biomass-derived 5-(hydroxymethyl) furfural (HMF) and furfural and their derivatives has been performed using a simple MnO2/NaCN system. The developed method allows the selective one-pot transformation of HMF to dimethyl furan-2,5-dicarboxylate (FDME) in 83% isolated yield without the formation of a free acid. Simplification of FDME production provides the missing link for manufacturing sustainable value-added materials from ...
Added: January 17, 2020
APPLICATION OF ZEOLITE Y-BASED NI–W SUPPORTED AND IN SITU PREPARED CATALYSTS IN THE PROCESS OF VACUUM GAS OIL HYDROCRACKING
, , , Petroleum Chemistry 2017 Vol. 57 No. 14 P. 1287-1294
The activity of supported and in situ synthesized sulfide Ni–W catalysts based on a low-siliconzeolite Y (SiO2/Al2O3 = 5.2) in the hydrocracking of vacuum gas oil is studied. It is shown that the temperature and time of reaction affect the fractional composition and the sulfur content in conversion products. Itis found that the phase of ...
Added: November 19, 2019
Hydrogenation of Unsaturated Hydrocarbons on Platinum and Palladium Catalysts Encapsulated in Mesoporous Bakelites
, , et al., Chemistry and Technology of Fuels and Oils 2017 Vol. 53 No. 3 P. 318-332
Syntheses are reported for catalysts derived from platinum and palladium nanoparticles supported on a mesoporous phenol formaldehyde polymer modified by an ionic liquid. These catalysts are used for the hydrogenation of unsaturated compounds, specifically, acyclic and cyclic isoprenoids: isoprene, 2,5 – dimethyl–2,4–hexadiene, limonene, α –terpinene, γ –terpinene, as well as phenylacetylene, transstilbene, and 1,4–diphenyl–1,3–butadiene. High ...
Added: November 19, 2019
Исследование токсичности каликс- и -аренов и их сульфатированных производных в двумерной и трехмерной культуре клеточной линии колоректальной аденокарциномы
, , et al., Биотехнология 2021 Т. 37 № 1 С. 87-94
A comparative study of the toxicity of two unsubstituted calixarenes consisting of 4 and 6 phenolic fragments, as well as their p-sulfated derivatives, was carried out on the HT-29 colorectal adenocarcinoma cells cultured in two-dimensional (2D) and three-dimensional (3D) formats. It was shown that both unsubstituted calixarenes decrease the viability of tumor cells; calixarene and ...
Added: June 30, 2021
Bari : Digilabs Pub., 2021
ASYS, the AIPEA School for Young Scientists. ASYS was successfully convened at the Andalusian Institute of Earth Sciences (CSIC-UGR, Granada, Spain) on July 15 and 16, 2017, under the supervision of Dr. Claro Ignacio Sainz Díaz, researcher of this centre, and in close connection to the 16th International Clay Conference in Granada (ICC 2017). Young and not so-young ...
Added: September 5, 2021
Fast Degradation of Tetracycline and Ciprofloxacin in Municipal Water under Hydrodynamic Cavitation/Plasma with CeO2 Nanocatalyst
, , et al., Processes 2022 Vol. 10 No. 10 Article 2063
Although water contamination with drug residues is a threat to public health, there are currently barely any effective methods of purifying water from pharmaceutical substances. In this study, continuous-flow sonoplasma treatment was used for the complete degradation of tetracycline and ciprofloxacin in polluted municipal water. The addition of CeO2 nanoparticles as catalysts significantly increased the degradation ...
Added: October 23, 2022
, , et al., Journal of Alloys and Compounds 2021 Vol. 859 Article 157782
MgPd2 is an intermetallic compound with a reversible hydrogen uptake near ambient conditions. Hydrogenation occurs near room temperature at pressures below 0.1 MPa to form a hydrogen-rich MgPd2H0.88 phase. In this work, hydrogen sorption isotherms were measured at 283 K ≤ T ≤ 328 K as well as at a cryogenic temperature of 77 K and pressure values up ...
Added: November 5, 2020
Push-pull molecules bearing a hydrazonocyclopentadiene acceptor moiety: from the synthesis to organic photovoltaic applications
, , et al., Mendeleev Communications 2019 Vol. 29 No. 3 P. 304-306
First representatives of a novel class of compounds containing an electron-accepting hydrazonocyclopentadiene moiety, π-conjugated phenylene spacer, and electron-donating triphenylamine moiety have been synthesized. Investigation of their optical, electrochemical and photovoltaic properties revealed a high potential of the hydrazonocyclopentadiene acceptor moiety in the design of donor-acceptor compounds for organic photovoltaics. ...
Added: October 14, 2020
Долгопрудный : МФТИ, 2021
Труды 63-й Всероссийской научной конференции МФТИ. Включены результаты оригинальных исследований студентов, аспирантов, преподавателей и научных сотрудников МФТИ и дружественных учебных и научных организаций. Статьи представляют интерес для специалистов, работающих в области радиотехники и компьютерных технологий ...
Added: October 29, 2021
, , et al., Solid Fuel Chemistry 2019 Vol. 53 No. 3 P. 159-165
The effect of mild pyrolysis methods (hydrothermal carbonization and torrefaction) on the physi-cochemical properties of biocoal was studied. It was established that biocoal obtained by hydrothermal car-bonization has a large specific surface area and exerts an exothermic effect upon decomposition; as comparedwith the samples obtained by torrefaction, it has a more dispersed structure and lower ...
Added: November 19, 2019
Biomass-Derived Ionic Liquids Based on a 5‑HMF Platform Chemical: Synthesis, Characterization, Biological Activity, and Tunable Interactions at the Molecular Level
, , et al., ACS Sustainable Chemistry & Engineering 2021 Vol. 9 No. 9 P. 3552-3570
A new family of protic ammonium ionic liquids (ILs) with various inorganic anions was synthesized from bio-derived 5-HMF. Starting with cellulose biomass, a complete preservation of the C6 unit was achieved throughout the synthetic sequence (no carbon loss). Evaluation of green metrics showed a significant advantage of the developed bio-derived pathway to access ILs from ...
Added: September 23, 2021
Chemical Transformations of Biomass-Derived C6-Furanic Platform Chemicals for Sustainable Energy Research, Materials Science, and Synthetic Building Blocks
, , et al., ACS Sustainable Chemistry & Engineering 2018 Vol. 6 No. 7 P. 8064-8092
Recent advances in the area of biomass-derived C6-furanic platform chemicals for sustainable biomass processing are analyzed focusing on chemical reactions important for development of practical applications and materials science. Among the chemical processes currently being studied, tuning the amount of oxygen-containing functional groups remains the most active research direction. Production of efficient fuels requires the removal of oxygen ...
Added: January 17, 2020
Clay swelling in dry supercritical carbon dioxide: Effects of interlayer cations on the structure, dynamics, and energetics of CO2 intercalation probed by XRD, NMR and GCMD simulations.
, , et al., Journal of Physical Chemistry C 2018 Vol. 122 No. 8 P. 4391-4402
In situ XRD and NMR experiments combined with molecular dynamics simulations using the grand canonical ensemble (GCMD) show that cation size, charge and solvation energy play critical roles in determining the interlayer expansion of smectite clay minerals when exposed to dry supercritical CO2 under conditions relevant to the earthâ€™s upper crust, petroleum reservoirs, and geological ...
Added: May 31, 2018
Rheological Properties and Sedimentation Stability of Polyanionic Cellulose-Microbarite Compositions in Aqueous Medium
, Polymer Science - Series B 2021 Vol. 63 No. 6 P. 894-904
Aqueous dispersions of mixtures of low-viscosity polyanionic cellulose with microbarite are studiedby viscometry, rotational rheometry, dynamic light scattering, and laser microelectrophoresis. Owing tothe interaction of the polymer with microbarite particles, the hydrodynamic size of the particles and theirelectrophoretic mobility increase, which indicates the formation of polymer-colloidal complexes. In themode of semidilute polymer solutions, the introduction ...
Added: October 22, 2022