Results 21 to 30 of about 635,495 (333)

N-Dopant-Mediated Growth of Metal Oxide Nanoparticles on Carbon Nanotubes

Nanomaterials, 2021
Metal oxide nanoparticles supported on heteroatom-doped graphitic surfaces have been pursued for several decades for a wide spectrum of applications. Despite extensive research on functional metal oxide nanoparticle/doped carbon nanomaterial hybrids, the
Jin Ah Lee, Won Jun Lee, Joonwon Lim, Sang Ouk Kim   +3 more
doaj   +1 more source

5-Aryl-2-(3,5-dialkyl-4-hydroxyphenyl)-4,4-dimethyl-4H-imidazole 3-Oxides and Their Redox Species: How Antioxidant Activity of 1-Hydroxy-2,5-dihydro-1H-imidazoles Correlates with the Stability of Hybrid Phenoxyl–Nitroxides

Molecules, 2020
Cyclic nitrones of the imidazole series, containing a sterically hindered phenol group, are promising objects for studying antioxidant activity; on the other hand, they can form persistent hybrid phenoxyl–nitroxyl radicals (HPNs) upon oxidation.
Svetlana A. Amitina, Elena V. Zaytseva, Natalya A. Dmitrieva, Alyona V. Lomanovich, Natalya V. Kandalintseva, Yury A. Ten, Ilya A. Artamonov, Alexander F. Markov, Dmitrii G. Mazhukin   +8 more
doaj   +1 more source

Recent Applications of Quinolinium Salts in the Synthesis of Annulated Heterocycles

SynOpen, 2022
Quinoline derivatives are frequently found in natural products and biologically active compounds; however, construction of quinoline fused polyheterocycles is a challenging goal in synthetic organic chemistry.
Suven Das
doaj   +1 more source

[3+3]-Annulation of Cyclic Nitronates with Vinyl Diazoacetates: Diastereoselective Synthesis of Partially Saturated [1,2]Oxazino[2,3-b][1,2]oxazines and Their Base-Promoted Ring Contraction to Pyrrolo[1,2-b][1,2]oxazine Derivatives

Molecules, 2023
A rhodium(II)-catalyzed reaction of cyclic nitronates (5,6-dihydro-4H-1,2-oxazine N-oxides) with vinyl diazoacetates proceeds as a [3+3]-annulation producing bicyclic unsaturated nitroso acetals (4a,5,6,7-tetrahydro-2H-[1,2]oxazino[2,3-b][1,2]oxazines ...
Yulia A. Antonova, Yulia V. Nelyubina, Sema L. Ioffe, Andrey A. Tabolin   +3 more
doaj   +1 more source

Rhodium-Based Catalysts: An Impact of the Support Nature on the Catalytic Cyclohexane Ring Opening

Nanomaterials, 2023
Because of the growing demand for high-quality fuels, the light cycle oil fraction improvement including cetane number improvement is important. The main way to reach this improvement is the ring opening of cyclic hydrocarbons, and a highly effective ...
Kristina E. Kartavova, Mikhail Yu. Mashkin, Mikhail Yu. Kostin, Elena D. Finashina, Konstantin B. Kalmykov, Gennady I. Kapustin, Petr V. Pribytkov, Olga P. Tkachenko, Igor V. Mishin, Leonid M. Kustov, Alexander L. Kustov   +10 more
doaj   +1 more source

Study Reactions of acetylenic amine N-Oxidewith reactive Halides [PDF]

مجلة جامعة الانبار للعلوم الصرفة, 2012
new acetylenic amine derived from cyclic secondary amines such as piperidine were synthesized , these amine were oxidized with m-chloroper benzoic acid to the corresponding N-Oxides.
Omar H. Shehab
doaj   +1 more source

Mechanisms of High Temperature Degradation of Thermal Barrier Coatings. [PDF]

, 2009
Thermal barrier coatings (TBCs) are crucial for increasing the turbine inlet temperature (and hence efficiency) of gas turbine engines. The thesis describes PhD research aimed at improving understanding of the thermal cycling failure mechanisms of ...
Wu, Rudder T.C., Wu, Rudder T.C.
core   +1 more source

On the catalytic behavior of copper toward oxygen reduction reaction in alkaline solution [PDF]

شیمی کاربردی روز, 2013
The kinetic and mechanistic aspects of the oxygen reduction reaction as well as the electrocatalytic effect of copper surface in alkaline solution were studied by cyclic voltammetry and rotating disk electrode technique. In the potential range of -0.4 to
Ali Arab, Fereydoon Gobal
doaj   +1 more source

CO₂ Sorbents Based on Spherical Carbon and Photoactive Metal Oxides: Insight into Adsorption Capacity, Selectivity and Regenerability

Molecules, 2022
This work aimed to obtain hybrid composites based on photoactive metal oxide and carbon having adsorption properties. The materials, composed of titanium dioxide or zinc oxide and spherical carbon, were obtained from resorcinol-formaldehyde resin ...
Iwona Pełech, Ewelina Kusiak-Nejman, Piotr Staciwa, Daniel Sibera, Joanna Kapica-Kozar, Agnieszka Wanag, Filip Latzke, Karolina Pawłowska, Adrianna Michalska, Urszula Narkiewicz, Antoni W. Morawski   +10 more
doaj   +1 more source

Characterization of Fe implanted yttria-stabilized zirconia by cyclic voltammetry [PDF]

, 1992
The technique of cyclic voltammetry has been applied to study reduction and oxidation phenomena which are observed at low oxygen partial pressures during steady state current-overpotential measurements of the Au, O2(g)/Fe implanted yttria-stabilized ...
Burggraaf, A.J., Hassel, B.A. van
core   +2 more sources