Materials Literature
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The optical properties of VO(2) nanoparticles formed in an amorphous SiO(2) host by stoichiometric ion implantation of vanadium and oxygen and thermal annealing have been determined and correlated with the particle size and morphology. The results show that that the temperature-controlled semiconductor-to-metal phase…
After modification with different trialkoxysilanes, nano-sized silica and alumina particles were used as fillers in transparent UV/EB curable acrylates for polymer reinforcement, particularly to attain scratch and abrasion resistant coatings. The acid catalyzed condensation of the organosilanes forms a polysiloxane sh…
Abstract Dilute aqueous smectite suspensions are well suited to convert into functional nanofilms. The functionalization is performed by ion exchange of amphiphilic molecules carrying the desired functionality. A functionalized clay mineral nanofilm is obtained by the organization of the molecules at the clay surface…
A carotenoid binding protein (CBP) has been isolated from the silk glands of Bombyx mori larvae. The protein has an apparent molecular mass of 33 kDa and binds carotenoids in a 1:1 molar ratio. Lutein accounts for 90% of the bound carotenoids, whereas alpha-carotene and beta-carotene are minor components. Immunologica…
Poly(oxyethylene- b -oxybutylene) block copolymers of various chain lengths (E m B n ) were blended with poly(oxybutylene) homopolymer (B h ), materials having different segregation strengths and morphologies (lamellae, cylinder, and sphere) were obtained. The isothermal crystallization kinetics and melting behavior o…
Abstract The adsorption of hexadecyltrimethylammonium (HDTMA) in smectite was studied by adsorption isotherms, X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM). Smectites that had reacted for 48 h with HDTMA cations equivalent to 0.2–3.0 times the cation exchange capacity (CEC) were…
Hollow carbon spheres (50-100 nm) have been synthesized by a self-assembly approach using hexachlorobenzene and Na. NaCl which generated during the reaction has been successfully exploited as a template for the direct synthesis of porous carbon materials, which can be subsequently removed from carbon product by anneal…
A pathway was metabolically engineered to produce poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV), a biodegradable thermoplastic with proven commercial applications, from a single, unrelated carbon source. An expression system was developed in which a prpC strain of Salmonella enterica serovar Typhimurium, with a…
PMo12-based inorganic-organic hybrid material (C21H38N)3PMo12O40⋅H2O was designed, synthesized and first used as a bulk-modifier to fabricate a renewable three-dimensional chemically modified carbon paste electrode (CPE) by direct mixing. Electrochemical method was used to characterize the modified CPE. The hybrid mat…
Structure refinements of solid solutions of (Ca 1-x Sr x )TiO 3 (x = 0.0, 0.25, 0.5, 0.6, 0.65, and 1.0) were undertaken using single crystals at ambient conditions. Their lattice constants, c/a axial ratios, and cell volumes indicate continuous changes from orthorhombic to cubic through a tetragonal phase. The orthor…
Using the water‐quenching technique, the thermal shock behavior of porous silicon carbide (SiC) ceramics was evaluated as a function of quenching temperature, quenching cycles, and specimen thickness. It is shown that the residual strength of the quenched specimens decreases gradually with increases in the quenching t…
Abstract Based on their electronic conductivity behaviour, metallic nanowires may have analytical applications ranging from interconnects to sensors. We present in this paper an electrochemical method for synthesizing Mo and Pd metal nanowires ranging in diameter from a few tens of nanometres up to one micrometre, wit…
The spectroscopic properties of Ni(2+)- doped nanocrystalline glass-ceramic fibers are reported. The cerammed fibers show strong fluorescence with peak wavelength at 1250 nm, 3-dB bandwidth at ~250nm, measured lifetimes at >1ms, and low-fluorescence saturation powers (~35mW) for 980-nm diode pumping. Current diode-pum…
Porous ZrO 2 ceramics were fabricated by compacting a fine ZrO 2 powder, followed by pressureless sintering. Two unidirectional pressures of 30 and 75 MPa were used to prepare the green compacts. The strength and the fracture toughness of porous ZrO 2 specimens sintered from the compacts prepared by 75 MPa were substa…
Abstract The aim of this work is to characterize the oxidation behaviour of different nickel‐base alloys exposed to high‐temperature and high‐pressure water for short oxidation times. The behaviour of Alloy 600 (74% Ni, 16% Cr, 9% Fe), Alloy 690 (60% Ni, 30% Cr, 9% Fe) and Alloy 800 (47% Fe, 32% Ni, 21% Cr) exposed to…
We demonstrate that an organic conductor α-(BEDT-TTF) 2 I 3 exhibits various types of transport phenomena when compressed along some crystal axes. When the sample is strained along the a -axis, the low-temperature electronic state changes from a charge-ordered insulating state under small strains to a narrow gap semic…
The use of ionic liquids as novel solvents for the synthesis of condensation polymers was investigated. A series of ionic liquids including new ones was synthesized and purified. 1,3-Dialkylimidazolium-based ionic liquids seem to be suitable reaction and activating media for the synthesis of high-molecular-weight arom…
Dendrimer-encapsulated Pd(0) nanoparticles inside poly(propylene imine) (PPI) dendrimers functionalized with triethoxybenzamide groups have been prepared by extraction of Pd 2+ and subsequent chemical reduction. The resulting dendrimer−Pd nanocomposites are unique catalysts for substrate-specific hydrogenation of pola…
The surface part of the oxygen incorporation reaction into the model material Fe-doped SrTiO3 is investigated by in situ optical spectroscopy. Experiments close to and far from equilibrium (small and large pO2 changes) and the effect of UV irradiation on the reaction rate allow us to draw the following conclusions wit…
The capacitive coupler, acoustic emission (AE) sensor and radio frequency current transducer (RFCT) have been used to detect partial discharge (PD) activity within a 132 kV prefabricated cable joint containing a known defect. Although each of the three methods has been applied individually under different situations,…