Materials Literature
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Polymer electrolytes containing polyethyleneimine and different concentrations of lithium bis(trifluoromethylsulfonyl) imide were investigated by impedance spectroscopy at different temperatures. Two equivalent circuit models were compared for the bulk impedance response. The first one includes a conductive Havriliak–…
A novel luminescent Eu 3+ -complex functionalized single-walled carbon nanotube (SWNT) was constructed by covalent linkage through a diaminotriethylene glycol linker. TGA, FT-IR, and SEM demonstrated successful attachment of the Eu 3+ -complex onto the SWNT surface. Spectroscopic methods showed that the SWNT-Eu 3+ com…
The paper provides an analysis of the thermal stresses in medium-voltage form-wound motor coils that arise from pulsed width modulated, repetitive square-wave, and impulse voltages. The effects of the shape, repetition rate, and rise and fall time of the pulses are studied through experimental and computational work.…
In this paper, the influence of the Mn content on the magnetocaloric response of ribbon-shaped amorphous samples of Fe80−xMnxB20 (x=10, 15, 18, 20, and 24), has been studied. For this purpose, the temperature and field dependence of the magnetic entropy change (ΔSM) have been obtained from magnetization curves. The pa…
Abstract Quintinite-1 M , [Mg 4 Al 2 (OH) 12 ](CO 3 )(H 2 O) 3 , is the first monoclinic representative of both synthetic and natural layered double hydroxides (LDHs) based on octahedrally coordinated di- and trivalent metal cations. It occurs in hydrothermal veins in the Kovdor alkaline massif, Kola peninsula, Russia…
Generic PD (Partial discharge) resistance characteristics of polymer nanocomposites are discussed mainly on thermosetting epoxy nanocomposites containing silica, alumina, titania, silicon carbide and layered silicate nano fillers. Generic PD erosion process comprises a process of erosion of epoxy to be impeded by nano…
The temperature dependent electrical properties of Ag Schottky contacts to a-plane bulk ZnO single crystal were investigated in the temperature range of 100–300 K. The variation in the barrier heights was described by a double Gaussian distribution with two different regions in the temperature range of 200–300 and 100…
The structural and electro-optic investigations of an achiral bent-core molecule in Sm AP A phase, in which the polar directors in the neighboring layers are arranged anti-ferroelectrically, show that it undergoes transformation from one biaxial to another biaxial structure via a quasi-stable uniaxial structure on the…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTMutual Alignment of Block Copolymer−Magnetic Nanoparticle Composites in a Magnetic FieldMatthew R. Hammond†*, Hervé Dietsch, Olivier Pravaz, and Peter Schurtenberger*‡View Author Information Adolphe Merkle Institute, University of F…
Ternary diamondlike semiconductors Cu2Ge1+xSe3 have been synthesized by direct-melting the constituent elements under several different synthetic conditions. The Hall effect and thermoelectric properties of Cu2Ge1+xSe3 were measured. All samples show positive Hall coefficients (RH) for the whole temperature range stud…
Abstract This work presents a synthesis route for low‐aspect‐ratio nanotubes consisting of a layer of magnetite (Fe 3 O 4 ) sandwiched between SiO 2 layers. In this template‐based strategy, self‐ordered porous alumina membranes are combined with the atomic layer deposition of SiO 2 and Fe 2 O 3 . An optimized electroc…
Switchgears are the key equipments in the distribution network. Operating switchgear with active Partial Discharge (PD) increases the risk of failure occurring at the time of switching leading to increased risk to the operator. PD in switchgears can be considered to take two forms, surface discharge and internal disch…
The temperature and field dependence of the I-V characteristics of Ba0.8Sr0.2TiO3 thin films and Ba0.8Sr0.2TiO3/ZrO2 multilayer thin films on Pt/Ti/SiO2/Si substrates are studied in the temperature range from 310 to 410 K. Leakage current behaviors of the film is analyzed in the light of various models. The bulk limit…
The electrical resistance of nanoporous gold prepared by dealloying is tuned by charging the surfaces of the porous structure in an electrolyte. Reversible variations in the resistance up to approximately 4% and 43% occur due to charging in the regimes of double layer charging and specific adsorption, respectively. Ch…
Abstract The crystal structure of quintinite-2 H -3 c , [Mg 4 Al 2 (OH) 12 ](CO 3 )(H 2 O) 3 , from the Kovdor alkaline massif, Kola peninsula, Russia, was solved by direct methods and refined to an agreement index ( R 1 ) of 0.055 for 484 unique reflections with | F o | ≥ 4σ F . The mineral is rhombohedral, R 32, a =…
Abstract Two crystals of Mg, Al-disordered quintinite-2 H (Q1 and Q2), [Mg 4 Al 2 (OH) 12 ](CO 3 )(H 2 O) 3 , from the Kovdor alkaline massif, Kola peninsula, Russia, have been characterized chemically and structurally. Both crystals have hexagonal symmetry, P 6 3 / mcm , a = 3.0455(10)/3.0446(9), c = 15.125(7)/15.178…
There is increasing concern over the risks of nanoparticles to humans and the environment, but little is known about the properties of the nanoparticulate mineral filters, such as titanium dioxide and zinc oxide, in sunscreens. There is an urgent need to develop methods for characterizing nanoparticles in (NPs) such p…
During the past few decades, the potential of treating infections with nitric oxide (NO) has been firmly demonstrated in various laboratories. Both in vitro and in vivo studies have afforded promising results in terms of reducing microbial loads in chronic wounds in addition to its utility in keeping medical devices f…
We have studied the effects of temperature (70–100°C), process duration (1–4 h), and the ratio of the acid mixture (concentrated HNO 3 and H 2 SO 4 in the volume ratio 1: 3) volume to carbon nanofiber weight (70: 1 to 133: 1 ml/g) on the yield of functionalization products and their dispersibility in water. The result…
The catalytic oxygen reduction reaction (ORR) at the cathode is a critical process to proton exchange membrane fuel cell (PEMFC) operation. The current catalyst materials of choice are platinum group metals (PGMs) with high costs and limited reserves. Reported herein are our recent efforts in developing non-PGM electr…