Materials Literature
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YVO4:Eu nanocrystals synthesized by direct precipitation reaction. The morphologic transformation of the nanocrystals as the results of thermal treatments were analyzed using optical spectroscopy. A red shift of the fluorescence lines with the increase of the crystallite size was observed. The kinetics of the 5 D0 lev…
Grain refinement studies on aluminium and magnesium alloys have attracted considerable attention in the last five decades. Inoculation of the melt with intermetallic compounds (Al 3 Sc, Al 3 Zr etc.), and borides and carbides of Al and Ti leads to heterogeneous nucleation of aluminium grains. This results in several a…
The characterization and investigation of the refractory properties of the Nsu clay deposit in Imo State Nigeria, has been studied in this present work. The physical and mechanical characterization of the sample was carried out following American Society for Testing and Materials (ASTM) stipulated standards. The chara…
ABSTRACT The crack‐healing behaviour of machining cracks in Si 3 N 4 /20 wt% SiC composite was investigated. The machining cracks were introduced by a heavy machining process, during the creation of a semicircular groove. The machined specimens were healed at various temperatures and times in air. The optimized crack‐…
Two types of photosensitive polyimides (PSPIs) were developed as novel cover layer materials for FPC applications in this work. One of them, PSPI-1 was highly soluble in common organic solvents such as NMP in spite of its stiff backbone structure. The PSPI-1 film formed by simple solution-casting exhibited a low CTE o…
Epidote-(Sr), CaSrAl2Fe3+(Si2O7)(SiO4)(OH), the Sr-analog of epidote, was found in the Nagakawara and Hohnomori deposits at the Ananai mine, Kochi Prefecture, Japan. It occurs in the form of prismatic crystals up to 1 cm in length in the tinzenite veins or the fine crystal aggregates in piemontite breccia. Epidote-(Sr…
The synthesis and the characterization of a series of DTPA-bis(amide) conjugates of tranexamic acid (L1), its esters (L2-L6), and their Gd(III) complexes of the type [Gd(L)(H2O)].nH2O (L = L1-L6) are described. Except for the case of , all Gd-complexes exhibit greatly enhanced R1 relaxivity. Highest R1 reaches up to 1…
Advanced coating of interior of tanks for rising environmental safety - novel applications of polyurethanesThe aim of this study was to develop urethane elastomers of predefined properties to be used as elastic coating in the cargo tanks of tankers. A method for coating the liquid polyurethane system onto steel and st…
Thermoelectric properties of metal (V, Co, Zr, Sr, W)-doped β-rhombohedral boron (β-Boron) were examined in the temperature range from 353 K to 1073 K. Doping with V (V1.5B105), which preferentially occupy the A1 sites, results in a great increase of electrical conductivity σ and a negative Seebeck coefficient S, whil…
Solid-state reactive sintering a stoichiometric mixture of commercial γ-Al2O3, Y2O3, Nd2O3 and Cr2O3 powders was conducted at 1800°C with tetraethoxysilane (TEOS) as sintering aid and CaO as charge compensator. The cubic garnet structure of YAG (Y3Al5O12) as well as orthorhombic structure of YAP (YAlO3) formed in the…
Anodization and subsequent cathodic polarization of a thin-film sample of Zr were studied with in situ neutron reflectometry and electrochemical impedance spectroscopy (EIS). The results show the originally thick sputter-deposited film generally behaved similar to a bulk electrode in neutral solution. The anodic oxide…
We investigate the adsorption dynamics of colloidal particles to a liquid/liquid interface. Such an analysis is important in the formation of Pickering emulsions. Using a free energy formulation that has been used for adsorption of surfactants, we obtain the time evolution of the surface coverage and dynamic surface t…
Residual stresses in Ga-doped ZnO films formed using a reactive deposition system were found to be compressive. The stresses decreased with film thickness, for example, 1.5 GPa in a 30 nm thick film and 0.2 GPa in a 500 nm thick film. The stress in each of the films was analyzed by heat-cycle testing between room temp…
Novel organosilylated tetrathiafulvalenes (TTFs) possessing Si-H or Si-Si bonds have been synthesised. The crystal structures of several derivatives have been determined by X-ray diffraction, including that of dimeric (Si2Me4)(TTF)2 (11) incorporating a diatomic SiMe2-SiMe2 linker. Cyclic voltammetry measurements in a…
The presence of particulates within thin electrolyte films covering the cathode in corroding systems affects the cathodic current distribution and the total current capacity. These effects are due to increased solution resistance (“volume effect”) and decreased available electrode area (“surface effect”) associated wi…
OBJECTIVE: Currently, no agent has been conclusively demonstrated to prevent the progression of non-alcoholic steatohepatitis (NASH). Chitosan, a natural product derived from chitin, was thought to possess hypocholesterolemic properties. The aim of this study was to evaluate the potential effects of chitosan on nutrit…
Nanoporous phospho-tungstate organic–inorganic hybrid materials have been synthesized from sodium tungstate and mono-n-dodecyl phosphate (MDP), which was used as both surfactant and phosphorus precursor. These hybrid materials were thoroughly characterized by N2 adsorption, elemental analysis, powder XRD, FTIR, Raman,…
Polyethylene/poly(ethylene oxide) diblock oligomers strongly phase separate and crystallize in lamellar structures. We synthesized exact length analogues that have a 1,4-disubstituted benzene ring inserted at the junction between the alkyl and PEO chains, and determined their solid-state structures. The n-alkyl chains…
A new class of mesogenic dipyrrins is reported and their use in the fabrication of fluorescent and metal-containing self assembling materials is demonstrated.
Mechanical milling is one of the severe plastic deformation processes and can give a heavy deformation to a metallic powder. Using such a mechanical milling process nano crystalline material can be produced with relatively simple equipment, low cost and short time. The mechanical milling process leads to finer grain t…