Materials Literature
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Upconversion luminescence properties of nanocrystals doped with and codoped with and under excitation with a 980 nm laser diode have been studied. The green and red luminescence, which are attributed to the to to and to transitions of have been observed from nanocrystals doped with as well as those codoped with and Ph…
The surface of three different grades of commercial high-purity α-Al2O3 powders produced by hydrolysis of aluminum alkoxide, which differ each other in SSA are evaluated by temperature programmed desorption mass spectrometry (TPDMS) and diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy. For the DRIFT…
One dimensional (1-D) alumina nanostructures were electrochemically synthesized on the surface of a porous anodic aluminium oxide (p-AAO) membrane by carefully controlling the temperature, voltage and time for anodization of aluminium foil. These nanostructures were characterized by scanning electron microscopy, field…
As geothermal energy is being developed and taking more importance, certain problems have occurred regarding the corrosion and the usage of the materials that are influence the effectiveness and the quality of the service. The knowledge of the characteristics of the geothermal fluid partly leading to the breakdown of…
The preparation of new charge transfer salts based on the DT–TTF donor and monoanionic square planar transition metal bisdichalcogenide complexes M(L)2 (M = Au, Cu; L = pds, pdt, bdt, where pds = pyrazine-1,2-diselenolate, pdt = pyrazine-1,2-dithiolate, bdt = benzene-1,2-dithiolate) are reported and these salts are ch…
Highlights include the formation of the first uranyl-based metallamacrocycles, the assembly of chiral metallocycles containing as many as 47 metal centres by cyclization of metal- and ligand-terminated oligomers under kinetic control, the formation of mesoscopic molecular polygons and capsules that can enantioselectiv…
Intumescent coating is an important fire protection method for steel structures. Traditionally its fire properties have been evaluated by performing furnace tests using a standardized test procedure and following a standardized time-temperature curve. This procedure is restrictive in performance based fire safety engi…
Accompanied with the prevalence of motors controlled by the inverter, the problem of surge voltage arising from the inverter has become intensified. The high frequency components of the inverter switching pulse voltage lead to the overvoltages due to the impedance of the cable between the inverter and the motor, and t…
The influence of humidity on the dielectric constant and leakage current of self-assembled porous silica films which have two-dimensional hexagonal periodic porous structures was investigated quantitatively by proposing a new water adsorption model. The amount of adsorption was calculated by the modified Rayleigh mode…
A new monomeric diiron beta-Keggin derivative, [(CH3)2NH2]5[beta-SiFe2W10O36(OH)2(H2O)Cl].7H2O (1) with non-adjacent substituted sites has been obtained in good yield by reaction of Fe(III) cations with [gamma-SiW10O36]8- in aqueous solution. The use of hydrogen bonding counter-cations produced a disorder-free polyani…
Chitosan is a linear polysaccharide obtained from chitin deacetylation. Several applications of chitosan have been proposed in specialized literature: water treatment, cosmetic, food additives, development of biomaterials, and mainly drug delivery. In the present paper chitosan was hydrophobized by esterification reac…
Mechanical testing after neutron irradiation is a critical research tool for evaluating materials for fusion systems, such as silicon carbide fiber silicon carbide matrix (SiC/SiC) composites. However, single-axis tensile testing, which is required to build a fundamental database, requires large specimens. Therefore m…
The gamma-deprotonation of a samarium(III) bis(trimethylsilyl)amide complex derived from a dimetallated trans-dioxaporphyrinogen has been achieved through stabilisation of the counter cation within the macrocyclic cavity.
Certain commercial aluminum alloys can become electrochemically activated by heat-treatment as a result of enrichment of the trace element Pb at the surface. For a better understanding of the nature of activation, Pb enrichment resulting from annealing for 1-24 h at 300-600°C in air, followed by quenching in water, wa…
We performed ion irradiation experiments on diamond samples at room temperature, probed by in-situ Raman spectroscopy. Different ions are used with energies of 200 or 400 keV. The intensity of diamond Raman band (at 1332 cm−1) decreases exponentially as the ion fluence increases. Results from different ions demonstrat…
A novel DTPA-tris(amide) derivative ligand, DTPA-N,N''-bis[bis(n-butyl)]-N'-methyl-tris(amide)(H2L3) was synthesized. With Gd3+, it forms a positively charged [Gd(L3)]+ complex, whereas with Cu2+ and Zn2+ [ML3], [MHL3]+ and [M2L3]2+ species are formed. The protonation constants of H2L3 and the stability constants of t…
Biomedical polymers that are designed to degrade faster at slightly acidic pH values may potentially be developed for use in drug delivery, pharmaceutical formulation and regenerative medicine. Water-soluble polyacetals derived from two well known pendent functionalised tyrosine-based diphenol monomers were prepared.…
A study was carried out to examine copper immersion deposition on AZ91 magnesium alloy in a hydrofluoric acid-containing bath. The role of fluoride and the effect of bath temperature were investigated. The study was performed by measuring the ac impedance and open-circuit potentials in combination with X-ray photoelec…
Nanoscale grains of crystalline TixSn1-xO2 were directly grown over the whole range of [Ti]/([Ti] + [Sn]) ratio (x = 0.00-1.00) in aqueous solutions at near room temperature.
Abstract This article provides an overview of the identification systems for various grades of wrought stainless steels, namely, the American Iron and Steel Institute numbering system, the Unified Numbering System, and proprietary designations. It elaborates on five major families of stainless steels, as defined by th…