Materials Literature
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Abstract Europium and dysprosium codoped strontium aluminate green phosphor was synthesized by combustion method using urea as reducer and fuel. The morphology, particle size, and structure of the products were characterized by scanning electron microscopy, X‐ray diffraction, and transmission electron microscopy, whil…
K–Ca ages of Cambrian glauconites from the Llano uplift, central Texas, were determined in order to re-evaluate the ability of the K–Ca system to constrain the timing of deposition of sedimentary packages. All of the K–Ca ages presented here were found to be younger than their stratigraphic ages. In addition to being…
RADA16 self-assembling peptide nanofiber scaffolds (SAPNSs) have been shown to have positive effects on neural regeneration following injury to the central nervous system in vivo, but mechanisms are unclear. Here we show that RADA16 SAPNSs form scaffolds of increasing fiber density with increasing peptide concentratio…
This paper investigates the effect of nonlinear grading material in controlling the electric field stress on outdoor polymeric insulator. Excessive electric stress combined with contaminations and moisture are responsible for the surface arcing, which may results in insulator flashover. The electric field and potentia…
A fluorescent ruthenium (Ru) complex is coupled to magnetic Fe3O4 nanoparticles (NPs) via3-(3,4-dihydroxyphenyl) propanoic acid (DHPPA) and O,O′-bis(2-aminopropyl) polypropylene glycol-block-polyethylene glycol-block-polypropylene glycol (PPG-PEG-PPG-diamine). The resultant Ru–Fe3O4 NP conjugate shows excellent colloi…
Molecular dynamics simulations are used to study the phase behavior of linear multiblock copolymers with two types of monomers, A and B, where the length of the polymer blocks NA and NB (NA = NB = N), the number of the blocks nA and nB (nA = nB = n), and the solvent quality varies. The fraction f of A-type monomers is…
Poly(amidoamine)s (PAAs) have received significant attention due to their good biocompatibility and fast biodegradation profile which gives these polymers high potential in biomedical applications. Conventional synthesis of PAAs via aza-type Michael addition reaction of primary amines to bis-acrylamides often proceeds…
Conducting polymer 3D microelectrodes have been fabricated for possible future neurological applications. A combination of micro-fabrication techniques and chemical polymerization methods has been used to create pillar electrodes in polyaniline and polypyrrole. The thin polymer films obtained showed uniformity and goo…
Abstract The photogalvanic effect was studied in a photogalvanic cell containing ethylene diaminetetraacetic acid as reductant, toluidine blue, and thionine as photosensitizers. The photopotential and photocurrent generated were 695.0 mV and 105.0 μA, respectively. The observed conversion efficiency was 0.16%, and the…
Gas-phase kinetics and mechanisms of SiH(3) reactions with SiH(4), Si(2)H(6), Si(3)H(8), and Si(4)H(10), processes of relevance to a-Si thin-film deposition, have been investigated by ab initio molecular orbital and transition-state theory (TST) calculations. Geometric parameters of all the species involved in the tit…
Abstract Solid‐state polymerization (SSP) of a poly(hexamethyleneadipamide) (PA 6.6)/clay nanocomposite system was studied. SSP runs were performed in a fixed‐bed reactor, at temperatures 160–200 °C and reaction times up to 8 h. The influence of clay presence on the PA 6.6 SSP rate constant was herewith quantified for…
The wall thickness strain and cross-section ovality of AM30 magnesium alloy tube after bending using a rotary draw bender were tested. Then the deformation mechanisms in the tube wall at different strain position were investigated. The results suggest that the extrados of the bent tube, which is thinning under tension…
The majority of power transformer high voltage bushings today are of the condenser oil impregnated paper (OIP) type. These bushings have a series of dielectric layers with conductive foils in between each layer, which improve electric field uniformity. This paper studies the electric field and potential distributions…
${\mathrm{Cr}}_{1\ensuremath{-}x}{\mathrm{Al}}_{x}$ exhibits semiconducting behavior for $x=0.15--0.26$. This Letter uses hard x-ray photoemission spectroscopy and density functional theory to further understand the semiconducting behavior. Photoemission measurements of an epitaxial ${\mathrm{Cr}}_{0.80}{\mathrm{Al}}_…
${\text{Gd}}_{5}{\text{Si}}_{x}{\text{Ge}}_{4\ensuremath{-}x}$ $(0\ensuremath{\le}x\ensuremath{\le}0.9)$ has been studied using neutron powder diffraction at a wavelength of $2.3724\text{ }\text{\AA{}}$. Antiferromagnetic ordering of the full $7\text{ }{\ensuremath{\mu}}_{B}$ Gd moments in the $Pn{m}^{\ensuremath{'}}a…
Sulphur hexafluoride (SF 6 ) has widely been used as an insulator in gas-insulated switchgear (GIS) applications. But due to the fact that it is a greenhouse gas, many researchers have been trying to find alternative solutions for it. Furthermore, SF 6 produces highly toxic and corrosive substances when it is subjecte…
The electronic ferroelectric lutetium ferrite (LuFe(2)O(4)) was studied by x-ray diffraction as a function of pressure. Pressure is shown to induce an irreversible rhombohedral to orthorhombic transition leading to a supercell determined by the combination of electron and synchrotron x-ray diffraction. This new config…
Phase states in sodium lauryl sulphate-water-1-decanol lyotropic liquid-crystalline system have been investigated for different temperature ranges. The dependence of triangle phase diagram types, phase boundaries, and sequence of lyotropic mesophases vs temperature has been found. The thermomorphologic, thermotropic,…
In this article, Ni0.5Zn0.5Fe2O4 ferrite powders were prepared by a reaction between Fe2O3, NiO, and ZnO powders in a molten salt. This article investigated the effects of firing temperature and holding time on the properties and microstructure of Ni-Zn ferrite powder via X-ray diffraction (XRD), field emission scanni…
A novel 1,3-dioxopyrrolo[3,4-b]porphyrin (2) has been synthesized in 70% yield following a [4 + 2] cycloaddition reaction of pyrrolo[3,4-b]porphyrin 1 with (1)O(2). The new imide was used as a template to other 1,3-dioxopyrrolo[3,4-b]porphyrins and to the corresponding open counterparts. The UV/vis absorption spectra…