Materials Literature
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and have been reported as promising materials for hydrogen separation membranes. However, their stability needs to be improved under hydrocarbon gas conditions. We report the effect of Zr doping in on chemical stability. is the main species to cause the stability problem, and the decomposition occurs by the following…
The single-phase InSb compounds have been prepared by novel melt spinning (MS) technique combined with spark plasma sintering (SPS) method, and the effects of melt spinning process on their microstructure and thermoelectric transport properties have been investigated. The results show that the free surface of ribbon o…
A copper based shape memory alloy was obtained by classical melting method. Chemical analyze beside copper, zinc and aluminum reveal small amounts of other chemical elements like iron, lead or nickel that can improve the damping capacity of shape memory alloy. Starting from chemical composition the material was analyz…
A solvent extraction route is proposed to synthesize CaF(2) hollow spheres, which are formed by reversed micelles in a solvent extraction system templating the self-assembly of CaF(2) nanoparticles.
Nanocomposite particles of Al2O3-doped ZnO prepared by mechanical treatment were used for fabricating ZnO ceramics. TEM observations revealed that Al2O3 nanoparticles uniformly existed on a ZnO particle. The sintering body fabricated using the composite powder prepared by this mechanical treatment process had more uni…
The structural transition of ZnO nanowires at high pressures from wurtzite to rocksalt structure has been studied by first‐principles density functional calculations using the SIESTA code. The size effect was studied by calculating a series of nanowires with different diameters, and the doping effect was studied by io…
Amide FcCONHC(CH2OH)3 (1; Fc = ferrocenyl), prepared from fluorocarbonylferrocene and tris(hydroxymethyl)methylamine, reacts with (Bu4N)3[H3V10O28] in N,N-dimethylacetamide to afford a salt containing a bis(triolato) capped hexavanadate anion bearing two ferrocenyl groups at its periphery, (Bu4N)2[{FcC(O)NHC(CH2O)3}2V…
The thermal treatment of copper films 3–168 nm thick over the temperature range 373–600 K for 1–120 min was shown to result in the formation of copper(I) oxide. Depending on the initial film thickness and temperature, the kinetic curves of the degree of transformation were satisfactorily described by a linear, inverse…
High-purity BCN hollow spheres were produced by pyrolyzing a simple polymeric precursor at 1000 °C. The chemical bonding states of the BCN spheres were investigated using X-ray photoelectron spectroscopy. SEM and high-resolution transmission electron microscopy studies revealed that the BCN hollow spheres have good sp…
A novel high aspect ratio material which can simultaneously display multiple functions such as proton and electron conductivity and electrocatalytic activity has been developed by incorporating both platinum nanoparticles and phosphoric acid doped polybenzimidazole along the inner and outer surfaces of a hollow carbon…
Reaction of the C(3)-symmetric triazine bridged tris(benzene-o-dithiol) ligand H(6)-1 with Ti(4+) leads to the unexpected formation of the dinuclear complex (Me(3)PhN)(4)[Ti(2)(1)(2)] while other C(3)-symmetric ligands are reported to form either mono- or tetranuclear complexes.
Slipped cofacial porphyrin dimer 1(2) with di-p-anisylamino groups on the meso-positions shows characteristic photo- and electroproperties making it suitable as a photosynthetic special pair model: more intense and red-shifted absorptivities in the visible region, and electronic communication between the two porphyrin…
The scaling law for relaxation times, τ(V,T) = ℑ(TVγ), recently proposed by Casalini and Roland, is utilized in the framework of KAHR (Kovacs Aklonis Hutchinson and Ramos) phenomenological theory. With this approach it is shown that the Pressure, Volume, Temperature (PVT) data obtained on Poly(carbonate)(PC) can be re…
摘要 分别采用REBO势和AIREBO势对单层和多层石墨烯的弛豫性能进行了分子动力学模拟，模拟了石墨烯在弛豫过程中的动态平衡演化过程.模拟结果表明，理想的自由状态下，单层石墨烯薄膜并非完美的平面结构，表面不完全平整，在薄膜边缘处出现明显的波纹状褶皱，而在薄膜内部褶皱并不明显，多层石墨烯边缘处的起伏幅度要比单层石墨烯的稍小. 关键词: 石墨烯 / 弛豫性能 / 不平整性 / 分子动力学方法 Abstract The relaxation properties of single layer and multilayer graphene sheets were investigated using molecular dynamic…
We present a new synthetic approach, via hydrothermal process with the use of polystyrene (PS) colloids, to fabricate vertically aligned, single crystalline ZnO nanotube arrays. Electron microscopy images revealed that single crystalline nanotubes with inner diameters of ∼15–20 nm and wall thicknesses of ∼10–15 nm wer…
Background: Biological shielding of nuclear reactors has always been a great concern and decreasing the complexity and expense of these installations is of great interest. In this study, we used datolite and galena (DaGa) minerals for production of a high performance heavy concrete. Materials and Methods: Datolite and…
Hydroxyapatite (HA: Ca10(PO4)6(OH)2) ceramic coating on magnesium (Mg) alloy (AZ31; Mg–3Al–1Zn) was achieved simultaneously by using a double layered capsule hydrothermal hot-pressing (DC-HHP) method at the low temperature as low as 150°C with no special surface treatment on the surface of the Mg alloy. A mixture of c…
Cellular orientation control is important for tissue regeneration. Design of oriented structures for cells with suitable features can be used in tissue engineering. One of the methods of cellular orientation with the aim of regenerating which damaged tissues is utilizing oriented biocompatible substrates. Different me…
The reaction of octylphosphonic acid with the surface of alumina nanoparticles has been investigated in order to prepare a close packing of grafted-alkyl chains. This goal was attained through a fitting selection of the experimental conditions in terms of pH, reactant amount, reaction time and temperature. DRX, TEM an…
Unsubstituted hexa-peri-hexabenzocoronene (HBC)-a small and well defined model system for graphite/graphene-was exfoliated and dissolved in water and the resulting individualized nano graphene sheets were characterized spectroscopically for the first time.