Materials Literature
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Cationic aqueous polyurethane (CAPU) coatings were prepared by the acetone process using 4,4-methylene bis (isocyantocyclohexane) (H 12 MDI), N-methyldiethyolamine (N-MDEA) and a series of various polydiols (polyethylene glycol (PEG), polypropylene glycol (PPG) and polytetramethylene glycol (PTMG) for ether-type polyo…
Property measurements are reported for Pb(Mg1/3Nb2/3)03-PbTiO3 (PMN-PT) single crystals grown along (001) by a seeded-melt method. Chemical segregation occurs during crystal growth, leading to property changes along the growth direction. Variations in dielectric, piezoelectric, and elastic properties were evaluated fo…
A new photochromic compound containing a pyrazole-ring unit, 1,3-diphenyl-4-(2-chlorobenzal)-5-hydroxypyrazole 4-methylthiosemicarbazone, was synthesized. Its structure, photochromic properties, and photochemical kinetics were characterized. The results show that the title compound exhibits reversible enol-keto photoi…
Abstract The thermodynamic database for the ZrO 2 – La 2 O 3 – Y 2 O 3 – Al 2 O 3 system has been derived using previous descriptions for the six binary systems and the ternary ZrO 2 – La 2 O 3 – Al 2 O 3 system. The parameters of the Y 2 O 3 – Al 2 O 3 system were adjusted due to changes in the Y 2 O 3 thermody-namic…
Abstract Two soil profile sequences on paragneiss debris in the Val di Rabbi (Northern Italy) along an altitude gradient ranging from 1200 to 2400 m a.s.l. were studied to evaluate the effect of aspect on the weathering of clay minerals. All the soils had a coarse structure, a sandy texture and a low pH. Greater weath…
Combustion and explosion in layers of nanostructured porous silicon has been studied in relation to the layer thickness and duration of sample storage after electrochemical anodization. The amount of hydrogen adsorbed on the surface of porous silicon after anodic treatment is evaluated. The amount of hydrogen accu-mul…
This study presents an experimental investigation on the flow behavior of the composites of high density polyethylene (HDPE) and very fine wood particles (smaller than 50 mm). Knowledge of the flow behavior can give insight into the processability of these composites especially in injection molding process. Complex mo…
Abstract This article is a review which concerns microfibres, their classification, manufacturing methods, different fibre forms, general properties, as well as their various applications. A brief attitude related to economical problems and future prospects is presented.
Some results of ab initio calculations and experimental studies of the C, N and C+N effect on the electron structure of austenitic CrMn steels are presented. It is shown that the total electron energy per atom decreases due to alloying in the sequence of carbon→nitrogen→carbon+nitrogen, which suggests a corresponding…
One of the most important outcomes of organic nanotechnologies could be development of well-integrated systems for sensing of particular chemical species. Use of color indicators is an attractive approach to guest reporting. Of the known chromophores, porphyrin and its derivatives are the most widely studied functiona…
The design of well-defined particulate carrier systems with controlled size, shapes and physicochemical characteristics is becoming a focal point in the field of biomedicine and drug delivery. Dendrimers are one of the emerging technologies of recent times and have served as a unique platform to achieve the developmen…
Chromium is an attractive alloying element in low alloyed steels since it gives good hardenability at low cost. The drawback with using chromium in powder metallurgy (PM) grades is its high affinity for oxygen. Thermodynamic calculations show that the oxygen partial pressure should be <4 × 10−18 atm at 1120°C in order…
Sm2Fe17Nx sintered magnets were fabricated by spark plasma sintering (SPS) technique. Effects of sintering pressure, sintering temperature and heating rate on the magnetic properties and crystal structures of the magnets were investigated. The results showed that the density of the magnet was obviously improved with i…
Este artigo apresenta uma revisão sobre o tema degradação térmica e estabilização do PVC. Os principais mecanismos de degradação desta resina são apresentados e correlacionados com os defeitos estruturais presentes no polímero, bem como os princípios de estabilização.
The behaviors of the electrical resistance at room and high (200°C) temperatures of acceptor (Mg)-doped BaTiO3 ceramics with the increase of acceptor concentration were investigated. A series of coarse-grained specimens with different acceptor concentrations that were sintered at various oxygen partial pressures was p…
ISHS XXVII International Horticultural Congress - IHC2006: International Symposium on Advances in Environmental Control, Automation and Cultivation Systems for Sustainable, High-Quality Crop Production under Protected Cultivation DISTRIBUTION OF CHLOROPHYLL FLUORESCENCE PARAMETER FV/FM WITHIN INDIVIDUAL PLANTS UNDER V…
Abstract Glass substrates were spin‐coated with a perfluoropolyether oligomer based organic‐inorganic hybrid material, and prepared by the sol‐gel process. Contact angle analysis and atomic force microscopic analysis were carried out to characterize the surface of the prepared coatings. All systems exhibited strong hy…
The surface of cotton fabric was successfully functionalized with vinyltrimethoxysilane in order to impart water repellency and wrinkle recovery and to introduce surface vinyl groups (—CH=CH 2 ) to the fabric, which could then be initiated for copolymerization reactions with various monomers. The introduction of activ…
Zeólita A e hidroxisodalita foram sintetizadas a partir de um rejeito industrial do processo de beneficiamento de caulim para papel, de indústrias da região amazônica. Esse rejeito é composto essencialmente por caulinita e possui razão SiO2/Al2O3 igual à requerida para esses dois tipos de zeólitas. Dessa maneira, o pr…
( 1 − x ) [ ( K 0.4725 Na 0.4725 Li 0.055 ) NbO 3 ] − x AgTaO 3 [ ( 1 − x ) KNNL − x AT ] lead-free ceramics have been prepared by the conventional mixed oxide method. Effect of the AgTaO3 (AT) content on the microstructure and electrical properties of (1−x)KNNL−xAT ceramics were systematically investigated. A morphot…