Materials Literature
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The growth of PEO ceramic coatings on AA 2024-T3 aluminium alloy in an aqueous Na 2 SiO 3 (10.5g/l), KOH (2.8g/l) solution at 310 and 400V for 500 and 710s, was investigated. The morphology, roughness and thickness of the coatings were determined by SEM, digital microscopy, XRD diffraction analysis and thickness measu…
Variable-composition evolutionary structure searches are used to explore stable stoichiometries for the Zn-O system below 300 GPa. Our results confirm the previous structural phase transition sequence of pressurised ZnO. ZnO is thermodynamically stable up to 300 GPa and zinc peroxide (ZnO 2 , space group Pa ) is metas…
Abstract A series of ladder‐type pyrene‐fused perylene diimides were designed and synthesized. To prepare the appropriate precursors, bromo‐perylene diimides and Bpin‐pyrene materials need to be coupled via Suzuki reaction. Whereas the Pd(PPh 3 ) 4 ‐catalyzed Suzuki reaction by heating was in low efficiency for the pr…
Silicon-based light-emitting diodes (LEDs) fabricated by the Si-ion implantation and chemical-vapor deposition methods are studied. Room-temperature dislocation-related electroluminescence (EL) is observed in LEDs based on n -Si. In LEDs based on p -Si, the EL is quenched at temperatures higher than 220 K. The EL-exci…
Oxide nanomaterials have been attracting growing interest for both fundamental research and industrial applications ranging from gas sensors, light-emitting devices, to photocatalysts, and solar cells. The optical and electronic properties of oxide nanomaterials are strongly dependent on their surface morphologies as…
In the present work copper(II) oxide nanoparticles have been synthesized using sol–gel technique. The characterization of the nanoparticles was done by X-ray Diffraction (XRD), Scanning Electron Microscope (SEM), Transmission Electron Microscope (TEM), Dynamic Light Scattering particle size analyzer (DLS) and Brunauer…
Hydrothermal microwave treatment of mixed solutions of potassium permanganate and hexamethylenetetramine within the pH range 0.5–6.9, resulted in various polymorphs of nanocrystalline manganese dioxide: α-MnO 2 (cryptomelane), γ-MnO 2 (nsutite), β-MnO 2 (pyrolusite), and δ-MnO 2 (birnessite). The pH values of the medi…
Plasma sources of model substances are required for solving problems associated with the development of a plasma separation method for spent nuclear fuel (SNF). Lead is chosen as the substance simulating the kinetics and dynamics of the heavy SNF component. We report on the results of analysis of the discharge in lead…
This study provides new insights into the relation between thermally induced structural reorganization and the macroscopic mechanical properties of radiation-damaged titanite. The natural sample contains ca. 30% amorphous fraction. Low-temperature annealing affects only slightly the sample stiffness and leads to a sof…
This paper presents a probabilistic model for insulator flashover based on numerical electric field calculation and random walk theory. The advancement to the state-of-the-art lies in the ability of the model to consider realistic events like arc jumping between the sheds by evaluating the electric field on the insula…
In doped ZnO (IZO), In-Al co-doped ZnO (IAZO) and In-F co-doped ZnO (IFZO) were deposited on glass substrates at 350 °C by spray pyrolysis technique. The structural, optical and electrical properties of as-deposited thin films were investigated and compared. A polycrystalline and (002) oriented wurtzite crystal struct…
We use experiments, modeling and numerics to study the imbibition dynamics from a point source into a homogeneous dry aqueous foam. A distinctive feature of foams compared to solid porous material is that imbibition occurs in the liquid microchannels of the foam called Plateau borders, which have a volume varying in s…
We have used a synthetic diamond with a layer of nitrogen-vacancy (NV) centres to image the magnetic field distributions of magnetic particles on the surface of the diamond. Magnetic field distributions of 4 µm and 2 µm ferromagnetic and 500 nm diameter superparamagnetic particles were obtained by measuring the positi…
The heat capacity at constant pressure CP of 1D-chains of methane molecules adsorbed in the grooves on the outer surface of the bundles of closed single-walled nanotubes was measured in the temperature range from 2 to 60 K for the first time. The behavior of the temperature dependence of CP below 12 K indicates the pr…
In the present work, SiC ceramics was fabricated with AlN using B4C and C as sintering aids by a solid-state pressureless-sintered method. The effects of AlN contents on the densification, mechanical properties, phase compositions, and microstructure evolutions of as-obtained SiC ceramics were thoroughly investigated.…
The article deals with the prediction of diffusion process of steel components, respectively diffusion of carbon during carburizing. The calculation was made on the basis of the solution diffusion in semi-infinite space. For the calculation there was used the II. Fick's law. For the reason that the transfer medium is…
Abstract Copper nanoparticles prepared by the polyol reduction method have been supported on graphene and the resulting Cu/G catalyst used for the oxidative C−O cross‐coupling of o‐substituted phenols and N,N‐dialkylformamide to the corresponding carbamates. The presence of B or N dopant elements on graphene plays a n…
Abstract This project aims to mechanically characterize through compression resistance and shore hardness tests, the mixture of hevea brasiliensis natural rubber with butadiene synthetic rubber (BR), styrene-butadiene rubber (SBR) and ethylene-propylene-diene monomer rubber (EPDM). For each of the studied mixtures wer…
Wide applications of nanofilms in electronics necessitate an in-depth understanding of nanoscale thermal transport, which significantly deviates from Fourier's law. Great efforts have focused on the effective thermal conductivity under temperature difference, while it is still ambiguous whether the diffusion equation…
Standard oral cancer therapy generally includes a combination of surgery with chemotherapy and/or radiotherapy. This treatment paradigm has not changed in some time. In this paper, we propose a chemopreventive nanodiamond platform for the delivery of celecoxib (Celebrex) to oral cancer lesions. This innovative platfor…