Materials Literature
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Time-dependent photoluminescence measurements of low-temperature-annealed Er-doped Si-rich SiO2 were conducted at sample temperatures 15–300 K. The erbium internal relaxation efficiency from the second (I411/2) to the first (I413/2) excited state upon luminescence-center-mediated Er3+ excitation is investigated. Despi…
In this study, the influences of Fe addition on phase formation and electrical properties of Ba(Ti 1 − x Fe x )O 3 with x = 0 to 0.02 were investigated. In addition, aging behavior of the ceramics was also investigated. The XRD analysis showed that the crystal structure of Ba(Ti 1 − x Fe x )O 3 changed from tetragonal…
One of the major expenses associated with recombinant peptide production is the use of chromatography in the isolation and purification stages of a bioprocess. Here we report a chromatography-free isolation and purification process for recombinant peptide expressed in Escherichia coli (E. coli). Initial peptide releas…
The PZT-PMN ceramics system proposed for piezoelectric transformation application was derived from Pb(Zr 0.52 Ti 0.48 )O 3 and Pb(Mg 0.66 Nb 0.33 )O 3 based compositions that obtained from the culombite method. The effect of MnO 2 addition on microstructure, physical properties and piezoelectric properties were invest…
A study of deep level defects in a hydrothermally grown, intrinsically n-type zinc oxide (ZnO) device has been carried out using conventional deep level transient spectroscopy (DLTS). Performed under variable measurement conditions, DLTS demonstrates two electron trap levels, E1 (dominant) and E2, with activation ener…
Abstract Eu 3+ , Bi 3+ coactivated double‐tungstate phosphors were prepared by the solid‐state reaction technique, and their photoluminescent properties were investigated. No concentration quenching of Eu 3+ was observed in the series samples of NaLa 1– x (WO 4 ) 2 : x Eu 3+ . With the introducing of Bi 3+ ions, the i…
Motivated by recent experimental results on anomalous spiral step motion on Si(001) surfaces, we use a phase-field model to understand the observed growth mode. The developed phase-field model allows simulation of step motion and surface phase switching for growth and sublimation. Our simulated results reproduce the a…
Abstract We report on single‐layered optical material of linear‐gradient microscale polymer‐dispersed liquid crystal (PDLC). E7/NOA65 composite films formed by pulsed UV laser photopolymerization‐induced phase separation exhibit two morphology types, namely a bipolar and a hybrid alignment of liquid crystal droplets.…
We report kinetics of photodarkening of a-As2Se3 films in terms of changes in absorption coefficient and optical band gap. These are estimated by in situ measurements of transmission spectra at intervals of 10 ms under laser illumination. The absorption coefficient increase with increasing time of laser illumination b…
Abstract The effect of CaO on the NH 3 + NO + O 2 reaction system at 650–850 °C was investigated. High CO 2 concentration was added to investigate the effect of CaCO 3 on this reaction system also. Experimental results showed that CaO had a strong catalytic effect on NH 3 decomposition, NH 3 oxidation by O 2 to NO, an…
As the use of diamond as a material for electronic and research applications increases, methods of patterning diamond will be required. In this work, single- and polycrystalline synthetic diamond samples were exposed to laser beams of different energies, wavelengths, and pulse durations. The effects of this exposure w…
La doped Na 1/2 Bi 1/2 TiO3 (NBT), Na 1/2 Bi1/2 − xLaxTiO3 (NBLT; x = 0, 0.01, 0.03, 0.05, 0.07, 0.10) ceramics, were prepared by solid-state reaction method. The effect of La doping on dielectric and ferroelectric properties of lead free NBT ferroelectric ceramics were investigated. NBT and NBLT single-phase were con…
Barium titanate is used as material for many important and widely used ceramic components and devices such as high permittivity ceramic capacitors, piezoelectric ceramic transducers and thermisters with positive temperature coefficient of resistivity (PTCR) [1 Jones, R. E., Mainar, P. D., Olowolafe, J. O., Campbell, J…
Single-walled carbon nanotube field-effect transistors were irradiated with 20 keV electrons using an e-beam lithography exposure method. Analysis of conduction data in the temperature range from 25 to 300 K indicated the creation of insulating regions containing traps along the nanotube channel. Further analysis of s…
Combination of phase change and resistive change was proposed to achieve multistate storage in one cell and Ge2Sb2Te5 (GST)/tungsten oxide (WOx) stack was fabricated. In reset process, three resistance staircases were observed, corresponding to the device transition from low-resistance-state (LRS) to a medium-resistan…
Abstract The Izod impact strength of two kinds of ternary composites was investigated. One consisted of polypropylene (PP), the triblock copolymer polystyrene‐ block ‐poly(ethylene butene)‐ block ‐polystyrene (SEBS), and calcium carbonate (CaCO 3 ) particles, and the other consisted of PP, carboxylated SEBS (C‐SEBS),…
Abstract Processible composites of emeraldine salt form of polyaniline (PANI) with polyacrylic acid (PAA) are synthesized and studied for their structural, electrical, mechanical, thermal, and electrochemical properties. The processible conducting composites of various weight percentage from 20 wt % to 90 wt % (of PAN…
The interest in natural fiber-reinforced polymer composites is growing rapidly due to their high performance in terms of mechanical properties, significant processing advantages, excellent chemical resistance, low cost and low density. In this study, the compression and injection molding of polypropylene (PP) and poly…
Dye-functionalized conducting polymers: A new concept in the design of monomers gives bithiophene-based monomers as "isolated" functional dyes, thus yielding electroactive films through anodic electrochemical polymerization (see picture).We have synthesized doubly strapped porphyrin derivatives with four bithiophene s…
Abstract In this study, ultrafine fibers of poly(ester imide) (PEI) were produced by gas‐jet/electrospinning of its solutions in mixtures of phenol and dichloromethane (DCM). The process parameters, including the solution concentration, gas flow rate, applied voltage, tip‐to‐collector distance (TCD), and inner diamete…