Materials Literature
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The Behavior of Polypyrrole-Coated Electrodes in Propylene Carbonate Solutions : I. Characterization of PPy Films by a Combination of Electroanalytical Tools and XPS, Levi, M. D., Lankri, Eli, Gofer, Y., Aurbach, D., Otero, T.
First successful syntheses and structural characterization of new core modified meso aryl azuliporphyrins by a simple [3 + 1] methodology are reported.
Ti–Cr–V alloys with a BCC structure have high protium capacities, but it is known that the cyclic properties for the alloys change with varying V content. In this paper, the cyclic properties of the Ti–Cr–V alloys are investigated in view of the crystal structure of the β protide phase, which was measured at the point…
The synthesis of 2, 3, 7, 8, 12, 13, 17, 18-octabromo-meso-tetrakis(2-pyridyl)porphyrin, H 2 Br 8 T 2 PyP , is described, including the comparison of four attempted methods for the demetallation of ZnBr 8 T 2 PyP . One of the methods represents a strategy of demetallation based on the acid-base properties of the macro…
Poly-(1-naphthylamine) films were synthesized potentiodinamically and potentiostatically from 1-naphthylamine in neutral acetonitrile medium using a platinum electrode. These polymer films were investigated by infrared spectroscopy. Contrary to earlier published results neglecting the stereochemistry of the poly-(1-na…
Ion-induced luminescence of alumina was analyzed with a time-resolved spectroscopic method. By using a pulsed ion beam, we selectively observed the prompt and slow components in the total luminescence. The luminescence spectrum showed some broad peaks at 330 nm (F+ center), 410 nm (F center), 510 nm (F2 center), 560 n…
The polymerization of (D, L)-lactic acid in the absence of catalysts was studied. Azeotropic distillation using xylene, gave poly(lactic acid) with very low molecular weight, which however, was further increased by post-curing in an air oven. Moreover degradation phenomena and residual xylene were observed, with this…
Lotus-type porous stainless steel SUS304L has been fabricated by unidirectional solidification under mixed gases of hydrogen and argon. The atmospheric pressure dependence of porosity and pore diameter has been investigated. The porosity is lower if the partial pressure of argon is higher under a constant partial pres…
This short contribution is aimed to describe two plasma processes utilized at the group of the authors for biomedical applications, namely: the grafting process of polar groups intended to obtain stable hydrophilic surfaces on hydrophobic polymers, and the deposition of thin organic coatings highly functionalized with…
The crystal structures of rccc-5,11,17,23-tetracarboxy-4,6,10,12,16,18,22,24-octa-O-methyl-2,8,14,20-tetra(n-undecyl)resorc[4]arene, 1, and its Ca salt, 2, are described. Structural data were analyzed in terms of supramolecular packing motifs of the constituent amphiphilic macrocycles. Monolayer experiments indicate t…
The wear and friction properties of Ti3SiC2-based materials were studied using the pin-on-disc method. The friction coefficient of Ti3SiC2-based material was not very sensitive to normal load, the steady state value, p, increased from 0.4 to 0.5 when the normal load increased from 7.7 N to 14.7 N. The wear volume for…
Micromagnetic NDT techniques like the measurement of the magnetic Barkhausen noise, the incremental permeability and the harmonic analysis of the tangential magnetic field allow deriving inspection procedures to online monitoring and control machinery parts and components in production processes in order to characteri…
A zirconium-doped mesoporous silica with MCM-41-type structure has been used as a support for nickel oxide and tested in the selective catalytic reduction (SCR) of NO with ammonia. From XPS and H2-TPR data, two kinds of catalysts can be prepared, depending on the nickel loading. Thus, low nickel loadings (1 and 3 wt%)…
We report the synthesis of a new class of nematic liquid crystals with triptycenes built into a p-dialkoxy-bis(phenylethynyl)benzene mesomorphic core. Triptycenes are appended on the center or terminal ring of the mesogen, leading to symmetric liquid crystals and reduced symmetry liquid crystals, respectively. Both ty…
The effect of different grades of hydroxyethyl cellulose (HEC) and hydroxypropyl methylcellulose (HPMC) on the film-formation and taste-masking ability for ibuprofen granules was evaluated. Three batches of coated ibuprofen granules were prepared using a roto-granulator, each with a different coating composition. Two…
In our previous reports, we have described the production of organic acids from palm oil mill effluent (POME) which were used as fermentation substrates to produce polyhydroxyalkanoates (PHA). Here we propose a zero emission from palm oil industry incorporating the production of PHA from POME. Our results showed that…
Research Article| January 01, 2002 Phyllosilicates in Very Low-Grade Metamorphism: Transformation to Micas Péter Árkai Péter Árkai Laboratory for Geochemical Research Hungarian Academy of Sciences H-1112 Budapest, Budaoersi ut 45, Hungary, arkai@geochem.hu Search for other works by this author on: GSW Google Scholar A…
The present necessity to use heat-resistant materials in electronics justifies the scientific interest in different heterocyclic polymers. This paper is especially concerned with the preparation of novel heat-resistant polyimides having bisbenzimidazole moieties in the main chain and their applications as dielectric f…
The microstructure evolution in a 7055 aluminum alloy subjected to thermomechanical processing (TMP) was studied at 450°C and \\dotε=1.7×10−3 s−1 at which the material exhibits superplastic behavior with a total elongation of 720% and the coefficient m=0.58. Partially recrystallized initial structure of the as-process…
Compression stress‐strain measurements have been made on commercial polymethylmethacrylate (PMMA) and polycarbonate (PC) polymers as a function of temperature (−197C to 220C) and strain rate. A split‐Hopkinson‐pressure bar (SHPB) was used to achieve strain rates of about 2500 s−1 and a servo‐hydraulic tester was used…