Materials Literature
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Nesse trabalho, estudou-se a ação inibidora do benzotriazol (BTAH) e benzimidazol (BZM) na corrosão do aço inoxidável austenítico tipo ABNT 304 em H2SO4 4,5 mol/L. Todas as soluções foram preparadas com água ultrapura e reagentes p.a.. As concentrações de BTAH e BZM foram: [BTAH]=10-5 mol/L, [BZM]=10-3 mol/L e a mistu…
The frequencies of the vibrational modes of CdTe and CdSe quantum dots and CdTe/CdSe core/shell nanoparticles prepared by the colloid chemistry method are determined using IR transmission and IR reflection spectroscopy. The experimental IR transmission spectrum of CdTe and CdSe nanocrystals exhibits a broad minimum lo…
(Pb1− x Ba x )ZrO3 ceramics for the composition range 0 ≤ x ≤ 0.30 were prepared by the mixed oxide solid state reaction method. Phase transition was studied by dielectric and dilatometric measurements. The ferroelectric to paraelectric phase transition temperature was progressively shifted to a lower temperature by r…
Thermal stability of silver ions in silicate glasses in dry and wet (0.5 - 50% of water content) atmosphere under elevated (160–230 °C) temperature is studied. The glass is doped with silver using silver-to-sodium ion exchange procedure conventionally used for the formation of optical waveguides. It is found that the…
This paper deals with steady-state heat conduction in integrated circuits due to surface heating. Temperature-dependent and orthotropic thermal conductivities are assumed, and an exact formula is obtained for the temperature field in the integrated circuit due to arbitrary surface flux loading. These general results a…
The grafting of 3‐(trimethoxysilyl)propyl methacrylate (TMSPM) onto chitosan by ceric ion initiation was studied under homogeneous conditions in 2% acetic acid solution. The grafted polymer was characterized by FT‐IR, 1H‐NMR, TGA and XRD and swelling studies. TGA results showed that the incorporation of TMSPM to the c…
The electronic structure of Ti-V-Cr alloys is calculated using the Korringa-Kohn-Rostoker method in the coherent potential approximation. The phase stability of the alloys is investigated as a function of the stoichiometry, the composition, and the hydrogen concentration. The results obtained are in good agreement wit…
The tensile and fatigue properties of a 6063-T6 aluminium alloy coated with an electroless Ni–P (EN) deposit have been investigated. The EN plating was in the as deposited condition, that is to say, without any post-heat treatment. The thickness of the coating was of about 40–50 μm and it had a P content of ∼9·5 wt-%.…
Conductive sulfur-containing material (CSM), synthesized by simply heating a mixture of polyacrylonitrile (PAN) and elemental sulfur, and its composite with polyaniline (PAn) were used as the cathode material for rechargeable magnesium batteries. X-ray diffraction (XRD) and Fourier-transform infrared (FT-IR) spectrosc…
Abstract Hydrogen related defects in anhydrous “dry”, hydrated “wet” and hydrogen implanted amorphous silicon dioxide ( a ‐SiO 2 ) layers are investigated using cathodoluminescence (CL) technique in a wave length range 200–800 nm at specimen temperatures between room and liquid nitrogen temperature. Particular defect…
Cupronickel pipes are widely used in cooling systems. Under this application, localized corrosion is observed, particularly associated with selective corrosion of nickel (denickelification). This work studied the denickelification process in solution-treated cupronickel alloys 90-10 (Cu-10wt%Ni), with aluminum and iro…
Abstract A low‐temperature study of Li 2 B 4 O 7 :Cu crystals by methods of time‐resolved polarization spectroscopy using synchrotron radiation in the 4–20 eV region and microsecond Xe flash lamp pulses in the 3–6 eV region is reported. The results strongly support the conclusion about a low‐symmetry position of the C…
Magnetoelectric coupling at room temperature in Pb1−xBax(Fe0.5Ti0.5)O3 (x=0.2 and 0.4) ceramics prepared by conventional solid state reaction method was observed. The Ba substitution for Pb reduces the lattice distortion, i.e., c∕a ratio, and hence the ferroelectric transition temperature reduces on increasing Ba cont…
Recently the authors have observed in compounds of the 4,n-alkyloxybenzoic acid series, with the homologous index n ranging from 6 to 9, a texture transition in the nematic range which subdivides the nematic phase in two sub-phases displaying different textures in polarised light analysis. To investigate a persistence…
Morphological variations of copper nanoparticles synthesized by the reduction of copper acetate with sodium borohydride in the presence of poly(N-vinyl-2-pyrrolidone) (PVP) have been investigated. The results indicate that the specific rod shape secondary aggregation of copper nanoparticles are formed in the case that…
Regarding the dielectric characteristics of the diffusion phase transition (DPT) in ferroelectric relaxor materials, several researchers have provided similar but different laws to explain these phenomenon. These laws, presented by Burfoot et al. and Eiras et al., have been proven to provide a better explanation, espe…
Carbon nanotubes possess unique chemical, physical, optical, and magnetic properties, which make them suitable for many uses in industrial products and in the field of nanotechnology, including nanomedicine. We describe fluorescent nanocomposites for use in biosensors or nanoelectronics. Then we describe recent result…
The behaviour of a preheated tungsten target under repetitive pulsed plasma impacts of the energy density 0.75 MJ m −2 with the pulse duration of 0.25 ms was studied with the quasi-stationary plasma accelerator (QSPA) Kh-50. Two identical samples of pure sintered tungsten have been exposed to numbers of pulses exceedi…
Crystalline silver nanowires 60-100 nm in diameter and tens of micrometres in length have been fabricated using a low temperature, solution synthesis technique. We explore the potential of this method to produce functional nanowire structures using two different strategies to attach active molecules to the nanowires:…
Abstract We have synthesized and studied the excitation‐emission properties of three erbium‐coordinating porphyrin‐based complexes for solid state films with emission in the 1530‐nm band. In two of these complexes the C‐H groups of the organic part (ligand) have been substituted with C‐F and/or C‐Br ones in order to a…