Science topic

Oxides - Science topic

Binary compounds of oxygen containing the anion O(2-). The anion combines with metals to form alkaline oxides and non-metals to form acidic oxides.
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Publications related to Oxides (10,000)
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The possibility of electrochemical determination of molnupiravir has been theoretically evaluated for the first time. The molnupiravir electrochemical oxidation over the poly((1,2,4-triazole)-co-(squaraine dye)) composite with cobalt (III) oxyhydroxide has been theoretically evaluated. The correspondent mathematical model analysis has shown that th...
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Self-discharge has attracted extensive attention as one of the main reasons limiting the wider application of supercapacitors. Current strategies for suppressing self-discharge are mainly focused on modifying the properties of each component. However, the effectiveness is limited by the lack of consideration for device configuration to maximize the...
Article
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Charge carrier modulation of graphene using the ferroelectricity of a nearby dielectric can be useful for controlling the electronic properties of graphene. However, when graphene is located on ferroelectric oxides, their electrical coupling frequently shows abnormal behaviors, such as anti-hysteresis, in field-effect transistor operation. From the...
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Bismuth-based materials (e.g., metallic, oxides and subcarbonate) are emerged as promising electrocatalysts for converting CO 2 to formate. However, Bi o -based electrocatalysts possess high overpotentials, while bismuth oxides and subcarbonate encounter stability issues. This work is designated to exemplify that the operando synthesis can be an ef...
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The drastic distortion of potentiodynamic polarization curves measured at high potential scan rates prevents the extraction of accurate kinetic parameters. In this work, we start by measuring potentiodynamic polarization curves of AA7075 at scan rates ranging from 0.167 mV·s ⁻¹ to 100 mV·s ⁻¹ , in an acidic 0.62 M NaH 2 PO 4 solution and a near-neu...
Article
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The state with effective total moment J eff = 1/2 stabilized by the spin-orbit coupling is known to suppress Jahn-Teller distortions and may induce a strong exchange anisotropy. This in turn may lead to the formation of an elusive spin-liquid state in real materials. While recent studies have demonstrated that such a situation can be realized in 3...
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Partially oxidizing methane into syngas via a two step chemical looping scheme is a promising option for methane transformation. However, providing the optimum lattice oxygen to selectively produce syngas represents the major challenge for the development of oxygen carrier materials in chemical looping processes. In this work, a NiO-modified LaFeO3...
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The call for a special issue in Oxidative Medicine and Cellular Longevity is open. Welcome to contribute research as well as a review article. The potential themes are listed in a special issue.
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A facile strategy for preparing Ov clusters enriched TiO2 (Ovc-TiO2) is developed via pre-hydroxylation-assisted vacuum calcination. The occurrence of Ov clusters is verified by the fluorine-occupied strategy. With the Pt deposition, Ovc-TiO2/Pt exhibits superior photocatalytic performance for CO oxidation at low Pt loading amounts, significantly b...
Article
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To enhance the peroxidase-like performance and its application in detection of toxic o-aminophenol (o-AP), a kind of bimetal Cu–Zn oxide-based mesoporous nanosphere (Cu2/3Zn1/3O PNPs) was constructed under microwave-radiation conditions. Its mesoporous microstructure and peroxidase-like catalytic activity were investigated in detail. The results sh...
Article
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Lead toxicity is a serious obstacle on the way of industrialization of the conventional lead-based perovskite solar cells (PSCs). Therefore, tin-based perovskites with low toxicity have been considered as a suitable alternative. They also have ideal bandgap and high carrier mobilities. However, the facile oxidation of Sn²⁺ to Sn⁴⁺ in tin-based pero...
Article
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Solution plasma is a promising method for the production of nanostructured materials. The explanation of physical and electrochemical processes during the growth of nanostructures under the action of solution plasma is very important for understanding the mechanism of oxide nanostructures formation. When forming nanoparticles of noble metals, some...
Conference Paper
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Several papers available in the technical literature highlight the microstructural characteristics of pearlite as important parameters that influence the mechanical behavior of steels, especially eutectoids. Numerous authors show that slight variations in interlayer spacing and average size of pearlite colonies promote significant changes in the me...
Article
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Variational Quantum Eigensolver (VQE) methods aim to maximize the resources of existing noisy devices. However, they encounter difficulties in simulating molecules of industrially-relevant sizes, such as constructing the efficient ansatz. Adaptive variational algorithms (ADAPT-VQE) can solve this problem but with a significant increase in the numbe...
Article
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Generally, MoS2 is easily oxidized when exposed to oxygen, and the antioxidation mechanism of MoS2 is still a challenge. Thus, more efforts were made to greatly improve its antioxidation performance. It was reported that the Ti atom doped with MoS2 was treated as the effective method to enhance its antioxidation performance; however, the detailed a...
Article
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(3 R ,4 S ,5 R ,6 R )-3,4,5-tris(benzyloxy)-6-methyltetrahydro-2 H -pyran-2-one ( 1 ) is a key intermediate for the preparation of promising SGLT2 inhibitors currently undergoing clinical tests for diabetes therapy. However, fewer reports have demonstrated the preparation of compound 1 at an industrial scale. In this article, an efficient preparati...
Article
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The dispersity of CuO determines the intrinsic activity of CuO-based catalyst in the reaction of HCl oxidation to Cl2. In this paper, CuO-based catalyst co-promoted by MnOx-CoOx with a mass ratio of 1:5 was synthesized and delivered a high STY of 4.94 gCl2 gcat⁻¹ h⁻¹. The characterizations show that the slight doping of Mn into CoOx was beneficial...
Article
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Simulation of chemical processes in a low-pressure rapid-thermal-processing (RTP) reactor during an in situ steam-generation (ISSG) process has been carried out. Using a Well Stirred reactor model (WSR), the composition of the gas medium (species concentration) was determined depending on the input parameters of the process: temperature, pressure,...
Article
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In this study, (Ti1−xWx)3SiC2 (x = 0–0.3) MAX phase ceramics were prepared via a solid-phase reaction synthesis method. The phase and performance effects of W-doping Ti3SiC2 were investigated. The microstructure and homogeneity of samples were characterized by XRD and SEM–EDS. Structural analysis show that when the amount of W is less than 5 mol%,...
Method
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By the both side of Trench MOSFET Trench Gate, and by the botttom of multi-step trench gate,the multi-Trench structure with P Plus ion implantation are setted,thus could shield the trench gate oxide better; also could be a good super junction device for a friendly fabrication;
Article
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In this study, the RF and stability aspects of SiGe source-based epitaxial layer tunnel field-effect transistor (SiGe source ETLTFET) are explored by extracting the capacitances, cutoff frequency (fT), maximum oscillation frequency (fMAX), and stability factor (K) from the non-quasi-static (NQS) radio frequency model. The results reveal that SiGe s...
Article
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Fiber optic surface plasmon resonance sensors based on bi-layers of Ag–TiO2 and Ag–Cu2O are proposed and analyzed experimentally. Influence of oxide layer thickness on the sensitivity of sensors has been discussed. Sensor based on Ag–Cu2O bi-layers has been found to be more sensitive than that of Ag–TiO2 bi-layers. Also, 40 nm Ag-5 nm Cu2O bi-layer...
Article
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Threshold value () and fatigue crack growth behavior at different temperatures and stress ratios were investigated in weld metal (WM) and heat-affected zone (HAZ) of an ex-service CrMoV steel joint. Compared with the at 25℃, the at 500℃ and 540℃ were still high, because significant oxide-induced crack closure (OICC) occurred in WM and HAZ during hi...
Article
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Buchwald‐Hartwig coupling of a triisopropylsilyl (TIPS)‐ethynylated dibromo‐N,N'‐dihydrotetraazapentacene with 1,4‐bis(TIPS‐ethynyl)‐2,3‐diaminonaphthalene furnishes a dihydrohexaazaoctacene. Its oxidation with MnO2 results in a 7,7'‐bi(hexaazaoctacenyl). In addition to eight TIPS‐ethynyl groups, the bioctacene motif protects the azaoctacene subuni...
Preprint
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The investigations of the reactive magnetron depositing of the stoichiometric coatings metal-metalloid were done. The dependences between sputtering parameters of a target and processes of plasmochemical formation on the surface of sample metal-metalloid and formations of coatings of the appropriate structure were investigated. Experimental data on...
Preprint
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Supplemental Material for Defect levels of 3d(n) transition-metal series in wide-gap oxide and fluoride insulators -- a first-principles study, which is accepted for publication in Physical Review B
Article
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In this work, we develop an electrochemical sensor using a polypyrrole nanotubes-modified graphite screen-printed electrode (PPy NTs/GSPE) for sensing hydroxylamine. The PPy NTs/GSPE-supported sensor has an appreciable electrocatalytic performance and great stability for hydroxylamine oxidation. Compared to a bare graphite screen-printed electrode,...
Article
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The formation, properties, decomposition and reactions of ethoxy groups on ZrO2, CuO, and CuO/ZrO2 were followed by IR spectroscopy. The reaction of ethanol with terminal Zr-OH groups leads to the formation of monodendate ethoxy groups (type I), whereas the reaction of ethanol with tribridged Zr-OH grups results in the formation of bidendate ethoxy...
Article
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A melatonina (N-acetil-5-metoxitriptamina) é um hormônio que atua no crescimento, desenvolvimento e resposta ao estresse de plantas, impulsiona enzimas antioxidantes, antioxidantes não enzimáticos e enzimas relacionadas ao reparo de proteínas oxidadas. Seu estudo ainda apresenta muitas lacunas para serem exploradas e respondidas. O fornecimento exó...
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The meaning, the appropriate usage and the misusage of the terms oxidative stress, oxidative eustress, and oxidative distress have been evaluated. It has been realized that the terms oxidative stress and oxidative damage are often used inappropriately as synonyms. The usage of the term eustress (intended as good stress) is unsuitable to indicate si...
Article
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The specification of power amplifiers (PA) is closely related to humidity variation, and few reports on the humidity properties of PA are available in the literature. Therefore, an experimental study of PA specifications was conducted under different humidity conditions to elucidate the relationship between the degradation of PA specifications and...
Article
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An efficient metal-free, (NH4)2S2O8 mediated oxidative dearomatization of indoles for the construction of C2-quaternary indolinones was disclosed. A series of C2-quaternary indolinones derivatives with good functional group tolerance were obtained in moderate to excellent yields. This methodology provides an alternative approach for the direct gene...
Conference Paper
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RESUMO: Os solos encontrados na maioria das margens dos reservatórios de barragens do Brasil são lateríticos, caracterizados por possuírem elevados índices de vazios, presença predominante de óxidos e hidróxidos de ferro e alumínio, agregações de partículas e curvas características bimodais. Em amostras remoldadas deste solo, pode ocorrer uma grand...
Article
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The majority of ferrochrome (FeCr) is produced through the carbothermic reduction of chromite ore. In recent years, FeCr producers have been pressured to curve carbon emissions, necessitating the exploration of alternative smelting methods. The use of hydrogen as a chromite reductant only yields water as a by-product, preventing the formation of ca...
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Citation: Velázquez, L.; Quiñones, J.; Inostroza, K.; Sepúlveda, G.; Díaz, R.; Scheuermann, E.; Domínguez, R.; Lorenzo, J.M.; Velásquez, C.; Sepúlveda, N. Maqui (Aristotelia chilensis (Mol.) Stuntz): A Natural
Article
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The redox equilibrium is important in preserving the correct functionality of vital cellular functions [...]
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The Ti-based metal-organic framework (Ti-MOF) MIL-125 nanocrystals with structural defects were synthesized by coordination modulation method. Compared to the pristine microporous MIL-125, the defective MIL-125 nanocrystals obtained hierarchically micro-meso-macroporous structure. Furthermore, the missing-linker defects provide rich coordinatively...
Article
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The oxidation of 4H-l,4-benzothiazines by 30% hydrogen peroxide in glacial acetic acid leads to the formation of 4H-l,4-benzothiazine S,S-dioxides. The ER. and 'H NMR spectral studies are also included.