Materials Literature
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The structures and electronic properties of ZnO nanowires (NWs) of different diameters are investigated by employing the first-principles density functional theory. The results indicate that the oxygen vacancy ( V O ) exerts a more evident influence on the band gap of the ZnO NWs. However, the effect will be weakened…
UV-visible absorption spectroscopy is useful for probing the electronic and structural changes of protein active sites, and thus the on-line combination of X-ray diffraction and spectroscopic analysis is increasingly being applied. Herein, a novel absorption spectrometer was developed at SPring-8 BL26B2 with a nearly…
The possibility of using metal-plated carbon and basalt fabrics for shielding electromagnetic radiation in a wide frequency range was demonstrated. The electrophysical characteristics of carbon, metal-plated carbon, and metal-plated basalt fabrics were compared. The optimum conditions of metal plating of complex texti…
A new mineral, mendigite (IMA no. 2014-007), isostructural with bustamite, has been found in the In den Dellen pumice quarry near Mendig, Laacher Lake area, Eifel Mountains, Rhineland-Palatinate (Rheinland-Pfalz), Germany. Associated minerals are sanidine, nosean, rhodonite, tephroite, magnetite, and a pyrochlore-grou…
Three mono-fluorine substituted porphyrin compouds were synthesized under microwave irradiation. The effects of catalysts and oxidants on the yields of mono-fluorine substituted porphyrins also were investigated. The yields of 5,10,15,20-tetrakis(4-fluorophenyl)porphyrin, 5,10,15,20-tetrakis(3-fluorophenyl)porphyrin,…
We report here the synthesis and study of naphthalenediimide–siloxane polymers with high thermal stability. Two of the five polymers investigated could be developed into recyclable materials. We use solid-state 29Si NMR to evaluate the degree of cross-linking and polymerisation in our materials.
RESUMO Frente à crescente necessidade de recuperar o meio ambiente e seus recursos naturais, atualmente a reciclagem e reutilização dos materiais torna-se uma das soluções sustentáveis mais visadas. Neste cenário, o processamento de compósitos particulados de alumínio em matriz termoplástica de polietileno de baixa de…
Here we report a simple and effective method in tailoring the optoelectronic properties of semi-conducting metal oxide for suitable device application. Sol-gel synthesis was used to synthesize manganese doped TiO2 nanopowder and commercially available TiO2 nanopowder was used as reference material. Thick films of thes…
In this study a novel approach for improving the photo-stabilization of polymers by incorporation of nanoparticles of a new niobium compound is reported.
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In a machining operation, cutting fluids are widely used as coolants to reduce the effects of heat, and also as lubricants to reduce the interface friction between the tool chip and tool workpiece. This paper presents the performance of both inorganic commercial lubricants and environmental friendly organic palm oil b…
Abstract Nanoscale multilayers of ZnS/Ag/ZnS were deposited on Corning glass substrates at different substrate temperatures. The depositions were carried out in high vacuum using electron beam deposition technique at 20, 60, 100 and 150 °C, respectively. The optical and electrical performance of each single layer and…
A new dinuclear Fe(III) complex, [Fe(5-MeOL1)(OH) 0.86 (CH 3 O) 0.14 ] 2 •2(CH 3 OH), [H 2 -5-MeOL1 = N , N′ -bis(5-methoxy-2-hydroxybenzylidene)-2,2-dimethylpropane-1,3-diamine], 1 has been synthesized and characterized by single crystal structure analysis. The structure of 1 consists of two Fe(III) centers with one…
A technique and results of investigation of compacted tungsten carbide substrates by scanning microscopy are reported. Samples are prepared in the course of studies of the wettability of tungsten carbide substrates with the iron melt, which are performed in accordance with the sessile drop method using two different h…
Mechanism of the electrolytic gold-plating and some properties of coatings deposited from a sulfite gold-plating electrolyte were studied. It was shown that soft coatings with low internal stresses can be produced from sulfite electrolytes. The mechanism of the electrolytic gold-plating process was described in terms…
An atomically resolved study of an adsorbate photoreaction on the surface of an isolated TiO 2 nanocrystal is reported. The crystal is grown in situ on Au(111) in an ultrahigh-vacuum chamber. The experiments use scanning tunneling microscopy (STM) backed by temperature-programmed desorption (TPD) to determine the surf…
Spectral properties of zinc sulfide sols stabilized by high-molecular polyvinylpyrrolidone have been studied. It is shown that the absorption spectra of colloidal solutions in the UV spectral range are determined by the quantum-confinement effect, exhibiting a dependence of the absorption edge on the size of zinc sulf…
Objetivos. Desarrollar y validar un mtodo para la determinacin del grado de desacetilacin molar del acetato de quitosana y lactato de quitosana, y realizar el estudio de estabilidad de ambas sales.
Graphene nanostructures were synthesized by Hummer method. 1, 3, 5 and 7 wt% of graphene nanostructures were suspended in certain amount of acetone on a mechanical stirrer and stirred then added to epoxy resin. After 4 hours, solution and Graphene platelets (GPs) were prepared. Nanostructures were characterized by X-r…
Air pressure affects the electrical performance of polluted insulator. The dc pollution flashover process of 7-unit XP-160 insulator string under low air pressure was presented by laboratory tests in this paper. During the tests, the flashover voltage and the critical flashover current were measured. Also, based on th…