Materials Literature
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A biodegradable poly(L-lactic acid) (PLLA) macroporous scaffold with a regular and highly interconnected structure in the size range from 50 to 150 mu m was fabricated from a PLLA--dioxane--water ternary system with the use of the thermally induced phase separation (TIPS) process. The phase diagram of PLLA with molecu…
The number and type of Cu2+ species present on O2-treated Cu-ZSM5 catalysts (Si/Al = 13.1–14.6) with varying Cu/Al ratios (0.12–0.60) were measured using temperature-programmed reduction in H2 or CO and desorption of O2 with He as the carrier. The effluent stream was monitored using mass spectrometry and the structure…
From failure experience on power transformers, it was very often suspected that inrush currents, occurring when energizing unloaded transformers, were reason for damage. In this paper, it was investigated how mechanical forces within the transformer coils build up under inrush compared to those occurring at short circ…
Ozone decomposition in water in the presence of an activated carbon has been studied. Variables investigated were agitation speed, carbon particle size, temperature and pH. In all cases, the presence of activated carbon improved the ozone decomposition rate. Between pH 2 and 7 the ozone decomposition rate due to both…
The characteristics of selenium in various solvents under solvothermal conditions were investigated in detail and the different dissolution behavior of selenium in the solvents identified. A brown homogeneous solution was obtained in ethylenediamine. This solution is metastable and is a suitable selenium feedstock for…
We examined the adsorption behavior of Cd, Zn, and Pb from mixed solutions on synthetically prepared Hydroxyaluminum (HyA)‐ and Hydroxyaluminosilicate (HAS)‐montmorillonite (Mt) complexes within the pH range 4 to 8. Initial concentrations of each metal (Me I ) of 1 × 10 −6 M in binary systems and 1 × 10 −6 , 2 × 10 −5…
Results are presented on a solid oxide fuel cell (SOFC) anode material designed for use with C-containing fuels: a composite of an electronically conducting ceramic, an ionically conducting ceramic, (GDC), and a small fraction Ni. These ceramic-based anodes were tested in SOFCs with GDC bulk electrolytes. The anode pe…
Well-ordered nanostructures were produced on industrial aluminum foils by one-, two-, and three-step anodizing processes performed in sulfuric acid at cell potentials between 15 and 25 V. Almost perfect triangular lattices of nanopores were obtained by the two- and three-step anodizing processes. It was found that the…
Environmentally-benign powder impregnation processing is adopted in fabricating bio-composites from chopped natural fibers and powder polypropylene. The surface modifications of natural fibers involving alkali treatment and treatment with maleated polyolefins are found to be very effective in improving fiber-matrix ad…
The perovskite structure of Pb(Zn1/3Nb2/3)O3 (PZN) ceramics was stabilized by adding a Ti-rich side tetragonal Pb(Zr0.47Ti0.53)O3 (PZT) across the morphotropic phase boundary (MPB). The 0.5 PZN–0.5 PZT specimen was found to have a two-phase zone, having a high piezoelectric coefficient, d33 (430 pC/N), an electromecha…
The object of this paper is to present an economic electronic module integrated on an electrolytic capacitor that is able to indicate the moment when it must be changed. First, with a switchmode power supply as an example, the high probability of electrolytic capacitor failure with respect to other power components is…
Polyethylene glycol conjugation or linking with the system is called PEGylation. Many novel drug systems are used for the delivery of drugs and bioactive substances to particular sites in a controlled or sustained manner, but various side effects or shortcomings restrict their use for the intended purpose. The shortco…
7 pages of Latex, 3 figures
Layered nickel hydroxide salts Ni(OH)2−x(A)x·nH2O (A = NO3−, n-alkylsulfonates CnH2n+1SO3− with n = 10, 14, 18) have been prepared by exchange reaction in aqueous medium at pH = 8.5, starting from the layered hydroxide acetate Ni(OH)1.5(CH3COO)0.5·nH2O. This parent compound has been synthesized by hydrolysis in polyol…
Chromate conversion coatings (CCC) are noteworthy because of their ability to self-heal if mechanical or chemical damage occurs, provided the damage is not too severe. Self-healing, or active corrosion protection (ACP), involves several discrete processes: release of chromate from the coating, its transport through so…
We present results of a comprehensive electrochemical study aimed at determining the factors that control the corrosion evolution of the important structural alloy Al 2024-T3. An important aspect of corrosion in this alloy is copper redistribution. The redistributed copper serves to enhance the kinetics of the corrosi…
The thermal reaction of undecylenic acid with a hydrogen-terminated porous silicon surface takes place at 95°C to yield an organic monolayer covalently attached to the surface through Si-C bonds. The acid terminal group remains intact and is not affected by the chemical process. Under the same conditions, alcohols bre…
Research Article| January 01, 2002 Mica Crystal Chemistry and the Influence of Pressure, Temperature, and Solid Solution on Atomistic Models Maria Franca Brigatti; Maria Franca Brigatti Dipartimento di Scienze della Terra, Università di Modena e Reggio Emilia, Via S. Eufemia, 19, I-41100 Modena, Italy, brigatti@unimo.…
Regular octahedral coordination has been reported for some copper(II) complexes in the solid state on the basis of crystallographic studies, e.g. hexaaquacopper(II) bromate, [Cu(OH2)6](BrO3)2, hexaaquacopper(II) hexafluorosilicate, [Cu(OH2)6]SiF6, and hexakis(pyridine-1-oxide)copper(II) perchlorate, [Cu(ONC5H5)6](ClO4…
The performance of a solid oxide fuel cell (SOFC) with the configuration, 3 wt % Pd-loaded FeO|25 mol % -doped air, was studied between 350 and 600°C. The BCY25 electrolyte showed higher ion conductivities than 8 mol % yttria-stabilized zirconia (YSZ) below 800°C and 20 mol % -doped ceria (SDC) below 600°C, thus havin…