Materials Literature
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Abstract Synthesis of a novel β , β′ ‐tetraalkylporphyrin dimer linked by vinylene was discribed, in which the dimer was readily prepared from a porphyrin‐derived Wittig reagent and a mono‐formylated porphyrin via Wittig reaction. No π‐conjugation between the two porphyrin rings was obserbed, and the dimer was in tran…
The local structure of the ferroelectric-relaxor PbSc 1/2 Nb 1/2 O 3 in the temperature range from 550 to 220 K has been investigated using 45 Sc nuclear magnetic resonance. It has been found that, in the paraelectric phase at temperatures below 550 K, the crystal consists of regions of an ordered elpasolite structure…
Mechanochemical treatment of aqueous solutions of Safranin T in the presence of oxides as catalysts was studied.
Nanoscale Chemical Analysis in Various Interfaces with Energy Dispersive X-Ray Spectroscopy and Transmission Electron Microscopy
Films of Er 2 O 3 grown on Si(111) substrates by rf-magnetron sputtering were characterized by synchrotron radiation X-ray diffraction and photoluminescence spectroscopy in spectral and time domains. We measured the photoluminescence and the intensity ratio of the peaks in the photoluminesence as a function of tempera…
The 100-nm NiO-Ag composite films with Ag content of 0 to 24.4 at.% are deposited on glass substrates. It is found that an ultra high electric resistivity (rho) value is obtained and cannot be detected by four point probe measurement when the Ag content is less than 3.4 at.%. The rho value is reduced significantly to…
This review surveys the recent developments in the plasma deposition of polycrystalline diamond (PCD) films from highly diluted (1%CH 4 in H 2 ) gas mixture and superhydrophobic fluorocarbon films from C 2 F 4 gas. Specifically, the pulsed plasmas are also used and examined at different duty cycles and pulse periods.…
A new type of Li-ion supercapacitor was fabracatied with activated carbon as cathode and graphite pre-intercalated Li ion as anode. The electrochemical characterization was also conducted with cyclic voltammetry and AC impedance methods. By this unique cell design , the capacitance of Li-ion supercapacitor keep the sa…
Pure magnesium hydroxide (Mg(OH)2) nanoparticles were synthesized successfully from dolomite-talc ore via chemical precipitation. Carbonate minerals in dolomite-talc ore were dissolved with hydrochloric acid, and Fe2+ was oxidized to Fe3+, then Fe3+ and Al3+ were removed by adding ammonia to adjust pH to reach 6. Magn…
The effect of atomic disordering induced by melt quenching or severe plastic deformation via high-pressure torsion on the physical properties (thermal expansion coefficient, electrical resistivity, thermoelectric power, magnetization) of a stoichiometric Ni 50 Mn 25 Ga 25 alloy and nonstoichiometric Ni 50 Mn 28.5 Ga 2…
In order to improve the effect of natural bamboo fibers degumming, the factors affecting the natural bamboo fibers separation effect in general alkali boiling conditions after the process of steam explosion were researched. The results showed that the degumming rate increased with the rise of steam explosion pressure…
We report on the geometric limits associated with tunability of interdigitated capacitors, specifically regarding the impact of a parasitic non-tunable component that necessarily accompanies a ferroelectric surface capacitor, and can dominate the voltage-dependent response as capacitor dimensions are reduced to achiev…
By molecular dynamics simulations employing an embedded atom model potential, we investigate the fcc-to-bcc phase transition in single crystal Al, caused by uniform compression. Results show that the fcc structure is unstable when the pressure is over 250 GPa, in reasonable agreement with the calculated value through…
This study investigated the corrosion resistance of plated and unplated steels useful as ornamentals in saline environment. Nickel plating of carbon steel was done in watts solution for 25minutes with a current density of 3 Adm<SUP>-3</SUP> at 60<SUP>o</SUP>C. The nickel plated carbon steel was later gold plated for 2…
Aluminum oxide (Al2O3) matrix have been reinforced by the multi-walled carbon nanotubes (MWCNTs) to overcome the inherent brittleness of Al2O3 matrix. In order to increase mechanical properties of MWCNTs-Al2O3 composites, MWCNTs need to be well dispersed and individually incorporated in Al2O3 matrix. In this work, alu…
Efficient two-steps method for the synthesis of octa(aminopropylsilsesquioxane)(OAPS) was described in this paper. The chloride salt of OAPS was prepared by the hydrolytic condensation of γ-aminopropyltriethoxysilane in methanol, with hydrochloric as a catalyst. The influence of several processing on the synthesis has…
In this paper the mechanical properties of a series of hydrogen functionalized graphyne are investigated through acting tensile loads on the monolayer networks. Molecular dynamics simulations are performed to calculate the fracture strains and corresponding maximum forces for pristine graphyne along both armchair and…
Extreme ultraviolet (EUV) radiation mediated carbon contamination and oxidation of the Ru mirror surface, and the corresponding impact on reflectivity were studied. In particular, time-dependent systematic decrease in EUV reflectivity with a 13.5 nm wavelength of light in high vacuum atmosphere was recorded and correl…
This work reports some thermoluminescent properties of chemical vapour deposition diamond film grown by 5 kW microwave assisted plasma chemical vapour deposition. The 2 diamond sample with the thickness of 32 m was exposed to gamma radiation in the dose range 0.6-55 Gy. The thermoluminescent glow curve of diamond samp…
The PROSPEcT project represents the UK?s contribution to an OECD WPMN (Organisation for Economic Co-operation and Development, Working Party on Manufactured Nanomaterials) sponsorship programme. The National Physical Laboratory (NPL) core activity relates to the physicochemical testing of manufactured CeO2 and ZnO nan…