Materials Literature
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We show that our new aging concept describes the electrical aging process of XLPE and, in fact applies to all polymers with free volume. The physical significance of the basic parameters (activation energy and volume) is discussed and it is shown that XLPE cable aging directly depends on the breaking of C-C bonds. The…
An electroforming process for fabricating bulk nanocrystalline Ni-W alloys with minimizing W-concentration gradient and fluctuation is presented. The homogeneities of W-concentration in both micrometer scale and millimeter scale are guaranteed from the W-concentration profiles obtained by the linear analyses of the en…
Poly- and single-crystalline SrO substituted BaTi2O5 (Ba1−xSrxTi2O5) were prepared by arc-melting and floating-zone (FZ) melting, respectively. Both showed a strong b-axis orientation and had maximum permittivity (εmax) at 1 mol% SrO substitution. The εmax values of poly- and single-crystalline Ba0.99Sr0.01Ti2O5 were…
We propose a theoretical study of the optimization of one dimensional metal-dielectric metamaterials in order to approach -1 effective optical index. Taking into account actual values of dielectric constants of metal (silver) and dielectrics (HfO(2), GaP), and taking advantage of the dispersion relation of Bloch modes…
Three types of nanostructured silicon carbide ceramics were prepared with additives of Al2O3 and Y2O3 as the primary sintering additives, together with 1 mass% CaO, 1 mass% MgO or 0.73 mass% AlN. The silicon carbides (SiC) containing tens of nanometers of grains were successfully fabricated using a two-step sintering…
The free dendrite growth of aluminum-4.5 mass%copper alloy has been investigated using a three-dimensional phase-field model with thin-interface-limit parameters. The dendrite growth velocity and the tip radius of curvature are measured for a given value of anisotropy intensity of the interface energy, and the stabili…
A novel class of photochromic biindenylidenedione derivatives containing two mesogenic biphenyl units connected with flexible alkyl chains were designed and synthesized. All of them exhibited photochromism in solid states on UV-Vis irradiation accompanied by the simultaneous generation of stable organic radicals, two…
A new method using thermal analysis database and optimization technique has been developed to substitute the original method what was based on trial and error. First, an original vacuum furnace was manufactured according to experiences. Modified baseline vacuum furnace which can be used in high temperature was produce…
Abstract ZrO 2 /SiO 2 nanocomposites with Zr loadings in the range 0.88 wt % to 12.2 wt % were prepared by a two‐step metal‐organic (MO)CVD process in a fluidized‐bed reactor with the Zr alkoxide [Zr(O i Pr) 2 (tbaoac) 2 ] as the precursor. The high surface area of silica was hardly diminished by the deposition, and t…
In semiconductor metallization processes, the galvanic corrosion of metals should be controlled to improve the process integrity. Refractory metals such as tantalum and tantalum nitride are widely used as a barrier metal to prevent the copper (Cu) metal from diffusing into the dielectric layers. In this study, the gal…
Starting from drug carriers and drug-delivery systems described in the literature, this article examines more specifically those that are relevant to the field of nanocarriers composed of a degradable hydrophilic polyelectrolyte backbone with pendent hydrophobes arranged to form comb-like co-polymers. Advantage is tak…
Doped is a potential anode for intermediate and high temperature solid oxide fuel cells, but by itself has limited catalytic activity for the hydrogen oxidation reaction. Its catalytic performance is, however, improved by Ni infiltration. The anode polarization is determined over a range of gas compositions of B-site…
Polycrystalline spherical Bi0.5Na0.5TiO3 (BNT) particles with narrow size distributions were obtained by the gel-sol method, where the precursory gel was composed of BiX3 (X=OH, NO3), NaOH, and stable Ti4+ complex which was prepared by mixing Ti(i-C3H7O)4 with triethanolamine to inhibit the uncontrolled hydrolysis in…
We report a versatile one-step multiphase approach to control size, crystallinity and assembly at the nanoscale. The method takes advantage of the controlled release of precipitating agents achieved through the solvothermal destabilization of reverse microemulsions. This method permits the preparation of nanoparticles…
Aluminium nitrate and aluminium isopropoxide were used as aluminium precursors to prepare bimodal porous alumina–silica mixed oxides via the sol–gel method with the addition of nonionic surfactant C16EO10 as the structure-directing agent. The characterization of the mixed oxides was performed using scanning electron m…
Bismuth telluride is a narrow bandgap compound semiconductor and has been used in thermoelectric coolers for decades. To prepare efficient thermoelectric microcoolers high-quality bismuth telluride thin films become essential. Bismuth telluride thin films are, in general, deposited at elevated temperatures to obtain c…
A simple conventional emulsion polymerization approach is developed to synthesize hybrid colloidal particles consisting of semiconductor nanocrystals and organic polymers. A uniform distribution of CdSe nanocrystals in composite hybrid particles of ∼20 nm diameter with relatively narrow size distribution is obtained.…
Pure copper samples were exposed in an environmental chamber for 2, 4, 7, 15, and 30 days at 90% relative humidity, 40 ° C , and 4 ppm hydrogen sulfide ( H 2 S ). Samples were subsequently subjected to microscopy and microanalysis using different techniques: scanning electron microscopy, energy analysis dispersive X-r…
A prediction of the limit of detection of an optical resonant reflection biosensor is presented. An optical resonant reflection biosensor using a guided-mode resonance filter is one of the most promising label-free optical immunosensors due to a sharp reflectance peak and a high sensitivity to the changes of optical p…
The corrosion inhibition of mild steel in one normal sulphuric acid solution by Brij-30 has been studied in relation to the concentration of the inhibitor as well as the temperature using electrochemical polarization (galvanostatic and potentiostatic) techniques. The results were supplemented with scanning electron mi…