Oxides - Science topic

Electrooxidation (EO) of glucose (Glu) on a stainless steel (SS) electrode surface was investigated under two conditions: in the absence and presence of Pseudomonas bacteria. In its absence, CV analysis revealed a redox system within potential (E) range from-0.5 to 0 V. However, when bacteria suspension was introduced into the electrolytic solution...

Developing non-noble and high-performance metal hydrogen evolution reaction (HER) electrocatalysts is significant for hydrogen production. Doping heteroatoms on the surface of graphene is another amazing measure to improve the catalytic behavior of catalysts. In this work, halogen-doped reduced graphene oxide with nickel nanoparticles (Ni-XRGO) was...

The incorporation of difluoroboron into the side arms of polyhedral oligomeric silsesquioxanes (POSSs) opens up new possibilities for the construction of metal-free photocatalysts with tailored properties. Herein, we report the design and synthesis of novel difluoroboron complexes of POSSs (POSS-tert-BF2, POSS-sal-BF2 and POSS-npht-BF2) derived fro...

In this paper, a β‐Ga2O3 enhancement‐mode metal‐oxide‐semiconductor heterojunction field‐effect transistor (MOS‐HJFET) is demonstrated using a counter‐doped β‐Ga2O3 channel, achieved by the diffusion of p‐type nickel oxide (p‐NiO). The junction between the diffused p‐NiO layer and the β‐Ga2O3 channel forms a depletion region, effectively blocking t...

A modular synthesis of bis(phosphine) monoxide (BPMO) ligands has been realized using the Michaelis–Arbuzov reaction of dialkylphosphinite esters. The modular synthetic method allows the chemoselective synthesis of BPMO ligands in which the substituents on the two phosphorus centers are different. This methodology also provides a route to N‐heteroc...

The Hauser−Kraus annulation of sulfonylphthalidewith Morita−Baylis−Hillman (MBH) adducts of nitroalkenesprovides access to phenanthrenes and naphthoquinone fuseddihydrobenzoxepines. The H−K annulation results in naphthoqui-nones bearing a key alcohol group in protected form, which leadsto naphthoquinone fused tetracyclic oxepines upon reaction with...

An effi cient, one-pot, and metal-free catalytic synthesis of β-keto sulfones was developed through the oxidative sulfonylation of enol acetates with readily available sodium sulfi nates. The protocol involves tetrabutyl-ammonium iodide (TBAI) as a catalyst and tert-butyl hydroperoxide (TBHP) as an oxidant at 60°C. The developed protocol off ers su...

Surface defects in Al-rich AlGaN Schottky barrier diodes (SBDs) contribute to high reverse leakage currents, which limit breakdown voltage—a critical parameter for power applications. In this study, atomic layer etching (ALE) was applied to the Schottky contact area to remove surface defects and native oxide. SBDs without ALE treatment exhibited a...

The oxidation behavior, optical properties, and oxidation mechanism of Mg0.27Al2.58O3.73N0.27 (MgAlON) transparent ceramics in the air at high temperatures were systematically investigated in this work. Above 1000°C, the rapid optical loss of MgAlON transparent ceramics can be attributed to the scattering and refraction of light caused by the gener...

Herein, we present a cross‐coupling reaction of arylthianthrenium salts at a late stage with diverse (hetero)aryl (pseudo)halides under reductive conditions, in which a palladium(0) catalyst differentiates between two aryl electrophiles based on the different rates of oxidative addition of arylthianthrenium salts and aryl halides for selective umpo...

A computational study of the regioselective aerobic oxidative cleavage of 1‐arylbutadienes is carried out employing density functional theory and high‐level coupled‐cluster methods, such as coupled‐cluster singles and doubles with perturbative triples [CCSD(T)]. The results demonstrate that the reaction proceeds either via the intramolecular reduct...

Transition metal oxides hold great promise across a wide range of applications due to favorable properties such as high abundance, low toxicity, and excellent stability. Nanoengineering approaches are essential for...

A facile and efficient protocol to synthesize C2‐phosphorylated 2,3‐2H‐chromones is discovered via Brønsted acid‐promoted tandem addition/cyclization of enaminones with H‐phosphine oxides. The reaction exhibits a broad scope, good functional group tolerance, and good yields, and features ability of a gram‐scaled synthesis. Results of mechanistic st...

An electrocatalytic cascade selenylation/oxidation of 2-alkenylanilines enabling the assembly of various 2-aryl-3-selanylindoles in one-pot under chemical-oxidant-free and transition-metal-free conditions was disclosed. A series of functional 3-selanylindoles were smoothly furnished in acceptable yields. This electrocatalytic strategy was flexibly...

Oxide inclusions in steel can significantly alter its working properties. One of the methods for analyzing the composition of oxide inclusions in metal is Fractional Gas Analysis (FGA). As a result of applying FGA, the curves of dependence of the rate of CO release from a metal sample and of temperature on time are obtained. This paper proposes a n...

The anti‐Markovnikov hydrofunctionalization of terminal, unactivated olefins is an evergreen synthetic challenge in organic chemistry. Several direct and indirect anti‐Markovnikov methods have been developed, ranging from the classical hydroboration/oxidation protocol to state‐of‐the‐art photoredox catalytic, transition‐metal‐complex‐catalyzed, and...

Solid-state lithium-ion batteries are increasingly recognized as a pivotal advancement for the next generation of energy storage technology, owing to their superior safety, high energy density, and extended cycle life....

Control of movement in artificial molecular machines relies on the formation of out‐of‐equilibrium states that can subsequently interconvert to their ground states. However, a detailed description of molecular machines that are out of equilibrium is a challenge because they are often too short‐lived to be characterized. Herein, the synthesis of two...

Sulfenic acids are involved in major chemical processes occurring in the atmosphere, in food chemistry and in biological systems. In these diverse environments, oxidation reactions caused by reactive oxygen species,...

Zn-doped In 2 O 3 (IZO) has been extensively studied as a transparent conducting oxide (TCO) due to its favorable optical and electrical characteristics. In this work, to uncover the origin of degenerate...

Trimetallic systems have garnered considerable attention in (electro)catalysis due to the synergistic effects resulting from the combination of three different metals. However, achieving precise control over the positioning of various metals and understanding the relationship between structure and performance remains challenging. This study introdu...

Achieving high electrical conductivity with graphene oxide based conductors remains a challenging task. Here, film fabrication by blade-coating was chosen as a fast and scalable method. The influence of different fabrication parameters like application speed, blade slit height, and shear stress on the electrical conductivity were evaluated. A shear...

Reactions of lanthanoid species with carbodiimides (RN ═ C ═ NR′) show considerable variety. Thus, treatment of the divalent 2,6‐di‐tert‐butyl‐4‐ethylphenolatosamarium complex, [Sm(OArEt)2(thf)3]·PhMe with N,N'‐diisopropylcarbodiimide (iPrNCNiPr) resulted in the formation of the oxalamidinatosamarium(III) complex [(OArEt)₂Sm(μ‐C₂N₄iPr₄)Sm(OArEt)₂]·...

This study introduces an efficacious palladium-catalyzed method for the regioselective and stereoselective cross-coupling of gem-difluorinated cyclopropanes with an array of gem-diborylalkanes under mild reaction conditions. The innovative methodology facilitates the synthesis of 2-fluoroallylic gem-diboronic esters with exceptional Z-stereo- and c...

Reduction as well as oxidation of the cyclo-As8 complex [{Cp′′Ta}2(μ,η2:2:2:2:1:1-As8)] (A, Cp′′ = 1,3-tBu2C5H3) are demonstrated to afford controlled dimerisation to unprecedented As16 species. The dication [{Cp′′Ta}4(μ4,η2:2:2:2:2:2:2:2:1:1:1:1-As16)]²⁺ slowly disproportionates in solution, yielding the largest polyarsenide species in a molecular...

A técnica de inspeção pulso-eco usada pelo método ultrassônico é aplicada para diversos fins, como detecção e análise de falhas e medição de tensões, residuais e aplicadas, em materiais metálicos, e como a superfície destes materiais se apresentam, geralmente, comprometidas por rugosidade e camadas de tintas e de óxidos, por exemplo, então, para a...

Sotirov, A. (2025). Composition, oxidation, exploration of Kyustendil ancient peat basin, Lambert Academic Publishing, ISBN: 978-620-8-43944-6, book language: English, page numbers 65. https://lap-publishing.com/#

Magnetite nanoparticles are an important nanomaterial with promising biomedical applications that depend crucially on their stoichiometry. Their tendency to oxidize and turn into isostructural maghemite means that discriminating between both...

The high oxygen content in additive manufacturing powders (up to 100 ppm) significantly increases oxide inclusions and reduces toughness. This study explored various deoxidizers to control oxides in laser powder bed fusion-processed (L-PBFed) maraging steels. A strong deoxidizer (0.11 wt.% Al) forms 65 nm Al2O3 due to its high oxide formation tempe...

This work investigates the electronic and structural properties of Janus transition metal dichalcogenide quantum dots. We explore various configurations with molybdenum (Mo) and tungsten (W), including oxidized, non-oxidized, and pristine phases. Using computational simulations, we analyze their charge-density asymmetry, thermodynamic stability, an...

The development of ultrahigh-temperature Nb-based refractory alloys is driven by the quest to further boost the energy efficiency of gas turbines. In terms of material requirements for ultrahigh-temperature applications, high strength at high temperatures, reasonable ductility at room temperature, and decent oxidation resistance are most critical....

The authors study the composition of highly concentrated hydrogen peroxide as an oxidizer for liquid rocket fuels. Different areas of using chromatograph mass spectrometry in the aerospace industry are considered. A comparative analysis is performed for ways of detecting and measuring impurities in highly concentrated hydrogen peroxide by means of...

Spin-polarized catalysts have garnered significant interest in electrocatalysis, namely in the electrocatalytic oxidation of water, which has very sluggish kinetics due to its high overpotential. After the groundbreaking invention that...

Glucose oxidation is a fundamental reaction in biosensing and energy conversion, and anodized copper electrodes have emerged as promising catalysts for its enhancement. This paper systematically investigates the link between...

The minimum degree Wiener index of a graph \( G \) is the sum of distances between all unordered pairs of vertices with minimum degree in \( G \). In this paper, we computed minimum degree Wiener index of wheel graphs, molecular graphs of graphene, oxide network etc. A class of bipartite irregular graphs named symmetric difference bipartite graph,...

Fucoxanthin from marine alga has beneficial used to alleviate hyperlipidemia due to high antioxidant capacity. The challenge to use this material due to unstable in harsh condition. Some previous studies showed extraction method was a crucial point to extract fucoxanthin. After extraction, fucoxanthin need to be encapsulated because it was not stab...

A novel method for the synthesis of quinoxalines from o‐phenylenediamines and sulfoxonium ylides, mediated by DBU (1,8‐Diazabicyclo[5.4.0]undec‐7‐ene), is presented. This method does not require metal catalysts or oxidants, making it economical and environmentally friendly, while exhibiting excellent functional group tolerance. Mechanistic studies...

A novel strategy has been devised for the synthesis of spiro[indene-1,4'-quinazolin]-2'(3'H)-one frameworks through a Ru(II)-catalyzed tandem ortho-C-H bond activation and spiroannulation of 4-arylquinazolin-2-ones with alkynes. This is the first example...

An efficient reaction at the counter electrode is of key importance for the success of net oxidative and net reductive electrochemical transformations. For electrooxidative processes, cathodic proton reduction to H2 serves as the benchmark counter reaction. In contrast, net reductive electrochemical transformations have less attractive oxidative co...

Unimolecular H-shift and endoperoxide ring formation reactions were studied for several different acyl peroxy radicals (APRs) using quantum-mechanical methods. Also, for structures with slow unimolecular reactions, accretion reactions with isoprene were investigated. The goal of the study was to determine which APRs could work as atmospheric oxidan...

Correction for ‘Ordered mesoporous zirconium oxophosphate supported tungsten oxide solid acid catalysts: the improved Brønsted acidity for benzylation of anisole’ by Zhichao Miao et al., RSC Adv., 2014, 4, 22509–22519, https://doi.org/10.1039/C4RA02809K.

Sodium-ion batteries (SIBs) have gained increasing attention due to their low production cost, abundant raw materials, and relatively high energy density. In addition, SIBs exhibit a range of desirable characteristics, including high specific capacity, good high-temperature performance, safety, and environmental friendliness. Therefore, research in...

Dehydroabietic acid (DHA) is a naturally occurring diterpene with relevant biological activities. 7-Oxodehydroabietic acid as a highly oxidized state derivative from Dehydroabietic acid (DHA) showing good activities. However, the reported compounds did not include triazole derivatives. To discover novel potent anti-inflammatory diterpenoids, a seri...

A series of novel dye-based organocatalysts was designed, synthesised and tested in the cycloaddition of CO2 to styrene oxide yielding styrene carbonate under mild reaction conditions (45 °C, 10 bar CO2)....

Boron is one of the important elements for organisms, especially for plants and animals. The importance of boron for humanity is increasing, and its uses are parallelly expanding. In this study, the quorum-sensing inhibition effects of five different boron compounds were investigated. The quorum-sensing inhibition assay was performed on CV026 and C...

Industrial sand is one of the most used raw materials in the world. With its high quartz content, industrial sand has a wide range of applications depending on its chemical composition. In the case of quartz sand, 99.1-99.4% is SiO 2 [1], whereas other types of sand such as feldspar and nepheline syenite have a quartz content of 68.4-76.8% [1] and...

The full text is available at the link: https://authors.elsevier.com/a/1kwIJ3IWkcIDK2

The paper presents the results of studies of photoluminescence (PL) of Li B 3 O 5 : Ag glass at a temperature of 12.6 K under the influence of synchrotron radiation λexc = 45 nm. It was found that the obtained PL spectra consist of three bands λmon = 278, 336, and 379 nm. Studies of the excitation spectra by scanning with the registration of lumine...

In this Letter, we report on a p-Cr2O3/n-Ga2O3 vertical heterojunction diode (HJD) with a kilovolt-level breakdown voltage (BV). The chromium oxide (Cr2O3) film was deposited via magnetron sputtering, with a controlled thickness of approximately 20 nm and a hole concentration of 1 × 10¹⁶ cm⁻³. High-resolution transmission electron microscopy of the...