Materials Literature
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This paper is concerned with the quasi-static rheology of packings of glass spheres of diameter d (d=0.2mm, 0.7mm or 3mm). Stick-slip behaviour is observed on small spheres, i.e d=0.2mm & 0.7mm ; one observes also in this case a weakening of the rheology as the rate of deformation increases, and the larger the rate th…
A series of manganese−cerium oxide composites with Mn concentrations in the range of 1−20 mol % in ceria was prepared by the solution combustion technique using urea as fuel. The nature, type, and oxidation state of Mn species in ceria were investigated by X-ray diffraction (XRD), diffuse reflectance UV−visible spectr…
The creation of an artificial superhydrophobic surface with micro- and nanostructures has been demonstrated using a block copolymer micelle solution and silica nanoparticles. The unique technique of a nanoparticle-supported micelle stabilization together with changes in the solvent power guarantees the precise morphol…
We studied the molecular mechanism of greater efficacy of paclitaxel-loaded nanoparticles (Tx-NPs) following conjugation to transferrin (Tf) ligand in breast cancer cell line. NPs were formulated using biodegradable polymer, poly(lactic-co-glycolide) (PLGA), with encapsulated Tx and conjugated to Tf ligand via an epox…
A series of Eu 2+ - and Mn 2+ -coactivated CaAl 2 Si 2 O 8 phosphors have been synthesized at 1400 °C under a reduced atmosphere and their luminescence properties have been investigated as a function of activator and coactivator concentrations. We have discovered that energy transfers from Eu 2+ to Mn 2+ by directly o…
The thermal parameters such as, glass transition temperature (T g ), crystalline melting point (T m ), initial thermal degradation temperature (T d,0 ), and coefficient of thermal expansion (E g ) of some halogenated polymers have been estimated employing two different relations such as the Van Krevelen method and the…
Many studies have been performed on aging of lead zirconate titanate (PZT), but a single model has not been universally accepted. An aim of this research was to determine whether harmonic analysis could distinguish among the models for the aging of PZTs. Doped and undoped PZT samples were prepared, and the aging behav…
Abstract ε‐Caprolactone and glycolide were copolymerized in bulk either with tin(II) 2‐ethylhexanoate (SnOct 2 ) or with bismuth(III) n ‐hexanoate (BiHex 3 ) as initiators and with tetra(ethylene glycol) as a coinitiator. The temperature was varied from 100 to 160 °C. The sequences were characterized with 1 H and 13 C…
Novel nickel catalyst deposited on nanoporous carbon was found to be an efficient catalyst for the epoxidation of simple alkenes with <TEX>$O_2$</TEX> and isobutyraldehyde under mild conditions. Alkenes exhibited different reactivities towards Ni-catalyst and epoxidation with stilbene proceeds stereospecifically. This…
Due to its coefficient of thermal expansion (CTE) and phase stability up to 1360°C, tantalum oxide (Ta 2 O 5 ) was identified and investigated as a candidate environmental barrier coating for silicon nitride‐based ceramics. Ta 2 O 5 coatings were plasma sprayed onto AS800, a silicon nitride ceramic from Honeywell Inte…
The demonstration and confirmation of metamaterials with simultaneous negative permittivity and permeability, and thus a negative refractive index, has resulted in a surge of interest in the reflection and refraction phenomena at the interfaces of these so-called negative-index materials (NIMs). We present a systemati…
(Ba 0.6 ,Sr 0.4 )TiO 3 (BST) films were deposited on copper foils by radio frequency magnetron sputtering. By the use of controlled p O 2 high‐temperature anneals, the films were completely crystallized in the absence of substrate oxidation. X‐ray diffraction and transmission electron microscopy (TEM) revealed an abru…
Ultrafine tin oxide (SnO 2 ) fibers having a rutile structure, with diameter ranging from 100 nm to several micrometers, were synthesized using electrospinning and metallorganic decomposition techniques. In this work, we propose a precursor solution that is a mixture of pure SnO 2 sol made from SnCl 4 :H 2 O:C 3 H 7 O…
High‐resolution X‐ray scanning diffractometry has been used to study the residual strain in Si 3 N 4 /Ni diffusion bonds. Bonds were made by directly joining Ni and Si 3 N 4 samples of same geometry by applying high temperature and enough mechanical pressure. The axial and radial strain profiles have been determined b…
It has been discovered that Spectra ® fiber can shift its peak melting temperature upward by almost 10 if it is maintained at constant length. Based on this, a novel processing method called high-temperature, high-pressure sintering has been developed in which Spectra ® cloth is consolidated using heat and pressure to…
The broadband (10 kHz–18 GHz) complex dielectric permittivity of electrically lossy aluminum silicate–pyrolytic carbon composites is studied as a function of carbon content. The composites are made from a commercial machinable ceramic that is treated by oxalic acid refluxing, followed by sucrose pyrolysis within the o…
The effect of Y 2 O 3 addition (0–5 wt%) on the densification and properties of reactive hot‐pressed alumina (Al 2 O 3 )–boron nitride composites based on the reaction between aluminum borate (2Al 2 O 3 ·B 2 O 3 ) and aluminum nitride (AlN) was investigated. The densification process was very sensitive to the amount o…
Abstract Dithia‐(dithienylethena)phane derivatives, composed of dithienylethene moieties and benzene bridges, were synthesized by a coupling reaction of the corresponding bis(chloromethyl)benzene with bis(mercaptomethyl)dithienylethene under high‐dilution conditions. The products exhibit photochromic properties upon i…
The effects of lanthanide co‐dopants on oxygen diffusion in yttria‐stabilized zirconia (YSZ) are studied using a combined first principles density functional theory (DFT)/kinetic Monte Carlo (kMC) modeling approach. DFT methods are used to calculate barrier energies for oxygen migration in different local cation envir…
An ultra‐thin Ni‐based metal used as the electrode layer in multilayer ceramic capacitor determines the dielectric performance of the capacitor. The warpage and the continuity of the inner electrode layers, and a dihedral angle between BaTiO 3 layers and metal electrodes of two ceramic capacitors (X7R and X5R) were ch…