Materials Literature
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The optical absorption due to Mn3+, Cu2+, Ni2+ and Co2+ ions in industrial soda-lime-silica glass was investigated as a function of the Na2O concentration in the range of 11-19 mol%. With increasing Na2O concentration in the experimental glasses, the calculated basicity; Λcal, increased. The 29Si NMR spectra showed a…
A new method to attach polymers on carbon nanotubes has been studied. We used nitroxide mediated polymerization (NMP) to graft polystyrene from multi-walled carbon nanotubes (MWNTs). Carboxyl groups on MWNTs were activated with thionyl chloride (SOCl2) to give acyl chloride derivative (MWNT-COCl). NMP initiator was in…
Coordination compounds of iron(II) perrhenate with 4-propyl-1,2,4-triazole (L), [Fe3L6(ReO4)4(H2O)2](ReO4)2(I), [Fe3L6(H2O)6](ReO4)6·H2O(II), and FeL3(ReO4)2(III), were synthesized. Compounds I and III were studied by static magnetic susceptibility measurements and by IR and electronic spectroscopy. These complexes ex…
Residual stress fields induces elastic energy, stored in a material. Another kind of stored energy is due to dislocation density and this energy is mainly localized inside grains. The latter one is considered as a main driving force of recrystallization. However, the stored energy connected with the residual stresses…
The influence of reduction and reoxidation reactions on decomposition properties of an electrochemical cell with a catalytic layer (NiO/yttria stabilized zirconia) has been studied. To clarify the correlation between the decomposition properties and the redox reactions of NiO in the catalytic layer, we carried out the…
Porous cordierite ceramics with controlled porosity were fabricated via a reaction sintering using expandable microspheres as sacrificial templates and ceramics-filled polysiloxane as a precursor for cordierite ceramics. The influence of the sintering temperature, the template content, and the additive composition on…
Polycrystalline Ti40Zr40Ni20 bulk quasicrystals are used for microindentation and nanoindentation studies. The microindentation test gives the Meyer's hardness as 6.22 ± 0.16 GPa, but it does not exhibit any indentation size effect (ISE) nor any cracking, even at a higher 200g load. From nanoindentation tests, the red…
Rare-earth cobalt ruthenium oxides Ln2CoRuO6 (Ln=La, Pr, Nd, Sm, Eu and Gd) having the double perovskite-type structure were prepared at 1673 K in air. Rietveld analysis of the X-ray diffraction patterns revealed that the oxides crystallized in monoclinic cells with space group P21/n (No. 14). Co/Ru disorder up to 10%…
The photoluminescence properties of under excitation were investigated. The results indicate that the relative intensities of the peaks at and were enhanced with the increase of content, which results from the energy transferred from to of . This phenomenon causes the chromaticity coordinates to move from the cold-whi…
Normalisation methods for both Picture Frame (PF) and Bias Extension (BE) tests on rate‐independent compressible fabrics undergoing trellis shear are presented. Normalisation of PF test results is relatively straightforward and involves dividing the force results by a characteristic length. A normalisation procedure f…
The analysis of the electrochemical quartz crystal microbalance and electrochemical impedance spectroscopy results are consistent with a nickel electrodissolution process limited by the passage of Ni(I) to Ni(II), when chloride ions are present in the acid sulfate medium, or by the passage of Ni(II) to in solution, in…
Considering the importance of derived products from bamboo for some countries and the wood shortage in some areas of Brazil, this work analyzed the quality of boards composed by particles of Eucalyptus sp. and bamboo strips (Bambusa vulgaris Schr.). The panels were produced with a density of 0.60 g/cm³ and 10% of urea…
In the Stretch‐Blow Molding (SBM) process, the temperature distribution of the reheated perform affects drastically the blowing kinematic, the bottle thickness distribution, as well as the orientation induced by stretching. Consequently, mechanical and optical properties of the final bottle are closely related to heat…
The economical and environmental issues associated with fossil fuels have been urging the automotive industry to cut the fuel consumption and exhaust emission levels, mainly by reducing the weight of vehicles. However, customers increasing demands for safer, more powerful and luxurious vehicles have been adding more w…
Actualmente el uso de biomateriales para el tratamiento de heridas es un area de interes para los investigadores y personal medico, a tal punto que la ingenieria de tejidos busca soluciones mediante la utilizacion de estos productos en interesantes aplicaciones en cirugia y reparacion de tejidos danados. El objetivo g…
Spin-dependent electroresistance (ER) was observed in polycrystalline Nd0.67Sr0.33MnOy (y=3.00, 2.95, 2.90, 2.85, 2.80) samples, which were synthesized by solid-state reaction. For the sample with stoichiometry y=3.0, the I-V characteristic shows ohmic linearity over the whole range of measuring temperature. For the s…
The improvement in rolling contact fatigue life is a key subject to increase the reliability of bearings. It has been well known that the fatigue properties are significantly affected by nonmetallic inclusions in steel. The rolling contact fatigue life may be divided into two types, according to the type of reliabilit…
This book brings to the reader's attention the accumulated information on the thermophysical properties of titanium and its main alloys. The term "thermophysical properties" encompasses the range of phenomena that reflect the response of the metal to various effects especially under the conditions of a varying tempera…
Nanoporous 硅石电影被大音阶的第五音胶化过程与底准备，酸 andbase/acid 二拍子的圆舞催化作用。传播电子显微镜(TEM ) 和粒子尺寸分析器被用来描绘微观结构和粒子尺寸 sols.Scanningelectron 显微镜学(SEM ) 的分发，原子力量显微镜学(AFM ) 和分光镜的 ellipsometer 被用来描绘表面微观结构和硅石电影的光性质。大音阶的第五音的稳定性在长期的存储期间被调查。而且，硅石电影的光常数的分散关系，和微观结构的控制和由在大音阶的第五音胶化期间改变催化作用条件的电影的性质处理也被讨论。
Alkyd coatings embedded with nano-TiO_2 and nano-ZnO pigments were prepared.The effects of nano pigments on anticorrosion performance of alkyd coatings were investigated using electrochemical impedance spectrum (EIS).For the sake of comparison,the corrosion protection of alkyd coatings with conventional TiO_2 and ZnO…