Materials Literature
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An investigation was carried out on the crystallization behavior of p-dioxanone polymers using differential scanning calorimetry (DSC). Kinetic analyses were performed on data collected primarily during isothermal crystallization. Isothermal data were treated within the framework of the classical Avrami equation. Usin…
The effect of glass fibers on the crystallization of poly(butylene terephthalate) (PBT) was investigated by crystallization kinetics analysis under isothermal and nonisothermal conditions. From the crosspolar optical micrographs of melt- and solvent-crystallized PBT composites, the glass fibers were found to increase…
Medical technology continues to advance rapidly, as physicians and engineers move closer and understand better each other's needs. Nowhere is there more evidence for this than in the development of advanced medical implants. Traditionally, new products were developed by prototyping and evaluation; however, this proces…
Microwave effects have been shown to promote the activation of NOx molecules in the process of selective reduction of NO by CH4 over an In–Fe2O3/HZSM-5 catalyst and to enhance the water tolerance of this catalyst for NO reduction.
The optical properties and quantum efficiency of potential red K 5 Eu x ( WO 4 ) 2.5 + 1.5 x ( x = 0.5 − 3.0 ) phosphors for a novel phosphor liquid crystal display (LCD) are measured under near‐UV excitation (394 nm). The quantum efficiency of K 5 Eu 2.0 ( WO 4 ) 5.5 phosphor fired at 900°C for 3 h is 0.46 at 365 nm…
A series of cationic porphyrins with 1-4 positive charges are studied: mono(N-methyl-4-pyridyl)triphenylporphine chloride [Mono], cis(N-methyl-4-pyridyl)diphenylporphine chloride [Cis], tri(N-methyl-4-pyridyl)monophenylporphine chloride [Tri] and tetra(N-methyl-4-pyridyl)porphine chloride [Tetra]. Their photophysical…
A series of N-substituted, thermally stable, photochromic fluorescing indol-2-ylfulgimides were synthesized, with high yields, from the corresponding fulgides by Lewis acid and hexamethyldisilazane promoted one-pot reaction. The quantum efficiencies of the photoinduced coloration and bleaching processes, in polar and…
The present investigation aims at elucidating the photoluminescence behavior of Tb 3 + activated yttrium aluminate perovskite (YAP) phosphors. The attention is especially focused on the 5 D 3 fluorescence and its energy transfer behavior. The decay curves of 5 D 3 emission were measured in terms to Tb 3 + content. Emi…
Uniform polyurethaneurea (PUU) spheres were prepared from 20–40 wt % urethane prepolymer (UP) solution of xylene. Uniform droplets were formed with the Shirasu porous glass (SPG) membranes of 1.42, 5.25, and 9.5 μm pore size, dispersed in an aqueous phase with dissolved stabilizers, and allowed to stand for the chain…
A finite element approach is used to calculate the influence of different grain boundary phases on the reversal process of sintered Nd-Fe-B magnets. To calculate equilibrium states of the magnetic polarization the total Gibbs' free energy is minimized with a quasi-Newton conjugate gradient method. It was found that th…
The present work is concerned with the mathematical formulation of the boundary value problem of dislocation dynamics. The boundary conditions for the elastic and dislocation fields are derived for two cases which are currently treated by dislocation dynamics simulation models. In the first case, the crystal space und…
The novel oxonitridoaluminosilicates (sialons) Sr3Ln10Si18Al12O18N36 (Ln = Ce, Pr, Nd) were obtained by the reaction of the respective lanthanide metals with Si(NH)2, SrCO3, and AlN using a radiofrequency furnace at temperatures between 1550–1650 °C. The crystal structures of the isotypic sialons were determined by si…
The adsorption of CO(g) on a Co/γ-Al2O3 catalyst has been studied by diffuse reflectance infrared spectroscopy. The effects of pressure, temperature and the addition of O2(g) and H2(g) have been investigated. Vibrational bands can be assigned to specific carbonyl species on the reduced Co catalyst, at low surface conc…
Nowadays, waste tires are a significant problem with the increasing in the number of automobiles. Therefore, much research has been performed in this field. From environmental and economical perspectives, recycling is one of the popular methods for the treatment of waste tire. However, it is not easy to melt down and…
The details of a new all-atom force field designed to reproduce the phases of the native I-α and I-β forms found in crystalline cellulose I are reported in this article. The energy differences, densities, unit cell parameters, and moduli are in close agreement with experimental evidence. Analyses of the modular dynami…
Gas solubilities and polymer swelling in propylene and semicrystalline polypropylene system at temperatures of 323.2 and 348.2 K and pressures up to propylene's vapor pressure were measured. Pressure, specific volume, and temperature (PVT) measurements of polypropylene were carried out at temperatures from 313 to 573…
Extended X-ray absorption fine structure (EXAFS) measurements have been performed on Er31 in silicate, borate, and phosphate glasses in order to investigate the local structure surrounding the Er31.Er31 ions coordinate to non-bridging oxygen ion sites, where alkali or alkaline earth ions terminate the network structur…
Experiments have shown that Ge3N4 is a promising material for application in photodiodes, amplifiers, optic fibers, protective coatings, etc., and several experimental studies have been carried out on this material, however, only one theoretical study has been reported in the literature about β-Ge3N4. In this work we…
Complex formation of nimesulide (N) and beta-cyclodextrin (beta CD) in aqueous solution and in solid state and the possibility of improving the solubility and dissolution rate of nimesulide via complexation with beta CD were investigated. Phase solubility studies indicated the formation of a 1:1 complex in solution. T…
The crystallization of a series of low-density polyethylene (LDPE)- and linear low-density polyethylene (LLDPE)-rich blends was examined using differential scanning calorimetry (DSC). DSC analysis after continuous slow cooling showed a broadening of the LLDPE melt peak and subsequent increase in the area of a second l…