Materials Literature
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Porous silicon layers have been prepared from n-type silicon wafers of (100) orientation. SEM, FTIR and PL have been used to characterize the morphological and optical properties of porous silicon. The influence of varying etching time in the anodizing solution, on structural and optical properties of porous silicon h…
Foi sintetizada uma dispersão aquosa de poliuretano (PUD) na qual o poli(propileno glicol) (PPG) foi utilizado como segmento flexível. O segmento rígido foi baseado nos reagentes isoforona diisocianato (IPDI) e a diamina hidrazina (HZ), produzindo um poli(uretano-uréia). A PUD assim obtida foi modificada com Na+-montm…
Abstract Electrochemical voltage and current noise (EN) were measured simultaneously with acoustic emission (AE) during intergranular stress‐corrosion cracking (IGSCC) on tensile specimens under a constant load. The elongation of the test specimens was also measured continuously during the tests, as an additional meas…
Using an icicle/iced-plate system, the corona discharge at the icicle tip was investigated under positive DC voltage. The discharge pulses were recorded and analyzed. The relationship between the discharge magnitude and the time interval before the pulse was examined. The mechanisms underlying the corona discharges at…
Effects of carbon nanotubes (CNTs) on the nematic backflow in a twisted nematic liquid crystal cell have been investigated. It has been reported that CNTs suppress the nematic backflow and thus the switching time is improved in case of low CNT doping such that it does not change the driving voltage. However, according…
Abstract Isomorphous bi- and mononuclear iron(III) complexes, [FeIII2L2(bimb)](BPh4)2 (1) and [FeIIIL(meim)]BPh4 (2), where H2L = bis(3-methoxysalicylideneaminopropyl)amine, bimb = 1,4-bisimidazolylbutane, meim = N-methylimidazole, and BPh4− = tetraphenylborate, respectively, were synthsized. Binuclear complex 1 showe…
A boron alloyed AISI 316L, sintered in pure hydrogen at 1250°C, was investigated to study the effect of the microstructure, with particular reference to the near full dense and boride free surface layers, on corrosion resistance and impact properties. The near full dense and homogeneous austenitic surface layer result…
A novel method, pulsed laser arc deposition combining the advantages of pulsed laser deposition and cathode vacuum arc techniques, was used to deposit the diamond-like carbon (DLC) nanofilms with different thicknesses. Spectroscopic ellipsometer, Auger electron spectroscopy, x-ray photoelectron spectroscopy, Raman spe…
Metastable states such as gels and glasses that are commonly seen in nanoparticle suspensions have found application in a wide range of products including toothpaste, hand cream, paints, and car tires. The equilibrium and metastable state behavior of nanoparticle suspensions are often described by simple fluid models…
We present investigations of the domain dynamics and of the evolution of the critical exponent β in a ferroelectric relaxor system, exemplarily in the up-to-date controversial strontium barium niobate (SBN). k-space spectroscopy at the phase-transition and when applying an electric field reveals a size-dependent respo…
Abstract This study focused on the structure and physical properties of acid-treated bentonite L45 from the Lieskovec deposit (Slovakia). New applications of near infrared and visible spectroscopies were used to follow Fe-montmorillonite dissolution and layer-charge reduction. Progressive dissolution of L45 results in…
Systematic studies of structural, magnetic, electric transport, and specific heat properties have been performed on lightly Cr-doped molybdates SrMo1−xCrxO3 (0⩽x⩽0.10). Based on the analysis of structural parameter variations, the valence state of the doped Cr ions in SrMo1−xCrxO3 system is suggested to be +2. Cr subs…
Abstract A new class of first generation azido‐terminated dendritic esters have been synthesized by four step processes. The final products and the intermediates are characterized by IR, 1 H NMR, and elemental analysis. Thermal studies revealed that these dendritic esters were thermally stable up to ∼190 °C and the gl…
Bismuth sodium titanate based lead-free ceramic fiber with the chemical formula of 0.885(Bi0.5Na0.5)TiO3–0.05(Bi0.5K0.5)TiO3–0.015(Bi0.5Li0.5)TiO3–0.05BaTiO3, BNKLBT-1.5, has been fabricated by a powder-based extrusion method. The ceramic fibers with 400μm diameter were well crystallized after being calcined at 800°C…
Abstract Insect silks have been used by mankind for millennia to produce textiles and in particular, the cocoon silk of Bombyx mori was the base of one of the most important industries in history. In fact, B. mori is probably the only domesticated insect if not invertebrate in its true and strict sense, comparable to…
Abstract Polyethylene(PE)/clay nanocomposites have been successfully prepared by in situ polymerization with an intercalation catalyst titanium‐montmorillonite (Ti‐MMT) and analyzed by X‐ray diffraction analysis (XRD), Fourier transform infrared analysis (FT‐IR), Transmission electron microscopy (TEM), differentail sc…
IEEE-PES Task Forces on insulator icing have been active since 1999 in developing icing test methods and recommending insulator selection criteria. Progress towards this goal included methods for obtaining reproducible results and also modeling of important factors. This paper reports on the progress and work accompli…
We demonstrated for the first time that nonionic surfactants such as T-80 not only act as stabilizing or protecting agents, but also can act as reducing agents for a facile “one-pot” synthesis of gold nanoparticles in an aqueous medium with tunable size at ambient conditions.
The purpose of this paper is to study the effect of insulator dimensions as well as applied water conductivity on flashover voltage under icing conditions, using a dynamic arc model. The electrical performance of several insulators with various diameters and dry arcing distances were evaluated using this model. Moreov…
Poly(vinyl chloride) and acrylonitrile‐butadiene‐styrene terpolymer blends made via melt blending were studied with respect to property enhancement, morphology, and physicochemical characterization. Blends were characterized by various thermal, morphological, and spectro‐chemical methods of analysis. Two distinct glas…