Materials Literature
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Effect of side chain length on the molecular aggregation states and surface properties of poly(fluoroalkyl acrylate)s [PFA-C y , where y is fluoromethylene number in R f group] thin films were systematically investigated. Spin-coated PFA-C y thin films were characterized by static and dynamic contact angle measurement…
The relaxation of residual stress in a shot peened high strength low alloy steel in response to applied loads has been investigated for both single shot and cyclic loading. The near surface residual stress was measured predominantly by X-ray diffraction (first 10 μm) but supplemented for some conditions by measurement…
Abstract Extraction of rare earth elements from the Nd–Fe–B magnet scraps through the chlorination with NH4Cl was performed to study the effective process for reusing metal iron as well as rare earths. The Nd2Fe14B primary phase was selectively converted to neodymium chloride in the yield of ca. 90%, together with α-F…
The photoemission spectroscopies play a preponderant role in the study of the electronic and compositional properties of solids. However, in standard laboratory conditions the reduced escape depth, added to low photon flux of conventional sources, make inaccessible depth profile information in a non-destructive way. I…
The investigation described in this paper was conducted with the aim of determining electrochemical behaviour of CuAlNiSi alloy in a solution of sodium tetraborate (borax) at pH 10·0. In addition, the influence of benzotriazole (BTA) was investigated after various times of immersion of the alloy in BTA solutions. The…
A detailed optical and photoelectric characterization of pristine fullerene C60 films deposited onto n-silicon substrates (C60/Si), C60 films crosslinked by means of the solvent-free chemical functionalization with 1,8-diaminooctane (C60-DA/Si), and the pristine and crosslinked films decorated with silver nanoparticle…
We have carried out the study of the photochemical properties of a series of synthetic mesotetraphenylsulfonated porphyrins (TPPMS4) bonded to several metal ions such as: Cu(II), Zn(II), Pd(II), Mn(II), Fe(III), Ni(II) and Co(II) for the optimization of their clinical applications as antiviral agents against the human…
The shape of electrical trees is critical in determining the life of electrical insulation subject to this type of degradation. This paper identifies a physical basis for determining tree shape. A quantitative physical model for propagation of electrical tree structures in polymeric insulation is presented. In the pre…
Poliestireno de alto impacto (HIPS) é uma blenda polimérica clássica de reator produzida por polimerização in-situ de estireno em solução com borracha butadiênica. Na literatura, está bem estabelecida a importância do tamanho de partícula e da densidade da ligação cruzada da borracha na capacidade de cavitação e no co…
The crystal structure of a new mineral britvinite Pb 7.1 Mg 4.5 (Si 4.8 Al 0.2 O 14 )(BO 3 )(CO 3 )[(BO 3 ) 0.7 (SiO 4 ) 0.3 ](OH, F) 6.7 from the Lángban iron-manganese skarn deposit (Värmland, Sweden) is determined at T = 173 K using X-ray diffraction (Stoe IPDS diffractometer, λMo K α, graphite monochromator, 2θ ma…
Nanocomposites of conjugated polymers and wide band gap metal oxide semiconductors have received intense interests in recent years because of their potential application in solar cells. Photoinduced charge separation and recombination in conjugated poly[2-methoxy-5-(2-ethyl-hexyloxy)-(phenylene vinylene)] (MEH-PPV) se…
This article reports the field emission measurements on as grown tetrahedral amorphous carbon (ta-C) and nitrogen incorporated tetrahedral amorphous carbon (ta-C: N) films grown using a pulsed filtered cathodic vacuum arc technique. The effect of varying thickness on field emission in the as grown ta-C films and the e…
Much research effort has been committed to the development of bioceramics that promote bone tissue regeneration and this is still one of the greatest challenges for the scientific community. In this sense, silica-based ordered mesoporous materials constitute a new generation of bioceramics that combine the intrinsic p…
The effect of frequency upconversion (UC) was investigated in 0.05 and 2.00mol% Er2O3 doped in ZrO2 nanocrystals prepared by a sol-emulsion-gel process. Laser excitation at 1.426μm produced UC luminescence at ∼0.800, ∼0.525, ∼0.550, and ∼0.660μm corresponding to Er3+ transitions I9∕24→I15∕24, H11∕22→I15∕24, S3∕24→I15∕…
Abstract This work reports on research being carried out in thermal comfort in smart and adaptive knitting structures (functional structures). The total comfort of a garment comprises not only the sensorial, thermal and physiological component, but also aesthetic, colour and size aspects, which make up the so-called p…
Abstract We reveal the hydrogen isotope effect of three interactions, i.e, the reflection, the adsorption and the penetration ratios, by classical molecular dynamics simulation with a modified Brenner's reactive empirical bond order (REBO) potential potential. We find that the reflection by π ‐electron does not depend…
An L 9 (3 4 ) orthogonal experiment was performed for the optimisation of chemical composition of chromium white cast iron. The differences of the models by the orthogonal design and radial base function artificial neural network (RBFANN) were investigated. The results show that Si significantly influences the hardnes…
The syntheses of complexes of natural and synthetic porphyrins with Pt, Pd, Rh, and Ru are reported. Their electronic absorption spectra, phosphorescence spectra, and lifetimes at room temperature both in the presence and in the absence of oxygen were studied. Variations in the nature of the central metal atom and in…
Low current x-ray tubes operating at 25–40kV have been developed using monolithic carbon nanotube (CNT) cold cathodes as electron sources. The authors have tested CNT cathodes from various sources. They were systematically evaluated and conditioned in a vacuum chamber and then went through high temperature baking and…
Extinction spectra of 2D arrays of silver nanoparticles self-assembled on 5-20-nm-thick vacuum-deposited silver films exhibit extremely narrow plasmon mode in the blue spectral region, whereas the same particles self-assembled on thin films of Au, Cu, Cr and Ti damp the plasmon resonance. The observed narrowing was at…