Materials Literature
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The competition between the quadratic term in a Jahn-Teller vibronic interaction and the structural bias in an orthorhombic perovskite induces orbital mixing. We show that orbital mixing rather than Jahn-Teller fluctuations is responsible for the ferromagnetism found in the perovskite system ${\text{LaMn}}_{1\ensurema…
Water contact angles on polysulfone and polyethersulfone films exposed to UV irradiation have been found to decrease dramatically. We relate this phenomenon to the formation and release of disulfonic acid from the irradiated films, a well-known surfactant. The phenomenon appears to be reversible, namely, cleansed surf…
Para-substituted alkyl and alkoxy phenylazophenols (PAP’s) have been synthesized and used as hydrogen-bonded side chains for poly(4-vinylpyridine)-based comb-shaped supramolecules akin to the well-studied poly(4-vinylpyridine)/pentadecylphenol systems. In this paper we report the self-assembly of these new materials a…
Conducting polypyrrole (PPy) films with anthraquinonedisulfonate (AQDS) incorporated as dopants were prepared by electropolymerization of the pyrrole monomer in the presence of anthraquinone-2,6-disulfonic acid, disodium salt on a graphite electrode from aqueous solution. Cyclic voltammetry (CV), scanning electron mic…
Abstract The surface hydrophobicity/hydrophilicity of ramie fiber was regulated through the atom transfer radical polymerization of methyl methacrylate from initiators immobilized on the fiber. The optimal reaction conditions for preparing the macroinitiated ramie fiber were determined to be a temperature of 60°C and…
A micromechanics approach for assessing the impact of an interfacial thermal resistance, also known as the Kapitza resistance, on the effective thermal conductivity of carbon nanotube-polymer nanocomposites is applied, which includes both the effects of the presence of the hollow region of the carbon nanotube (CNT) an…
Fine tuning of the axial ratio of ceria nanorods by a time-dependent, face-specific growth and dissolution process has been demonstrated for the first time. Nearly monodisperse ceria nanorods can be synthesized by thermal decomposition of a ceria complex in the presence of only one type of surfactant (oleic acid). Str…
We explore the alignment of various achiral liquid crystals on films of aligned double-stranded helical DNA. In all cases and both for the nematic and smectic A phases, we find a distinctly chiral interfacial structure, with the mean orientation of the liquid crystal in contact with the DNA-treated surfaces chirally r…
The dehydroxylation of pyrophyllite involves the reaction of OH groups and elimination of water molecules through two possible mechanisms, one involving the bridging hydroxyl groups of an octahedral Al (3+) pair and the other two hydroxyl groups reacting across the dioctahedral vacancy. First-principles molecular dyna…
Fe(3)O(4)@Au/polyaniline (PANI) nanocomposites were fabricated by in situ polymerization in the presence of mercaptocarboxylic acid. The mercaptocarboxylic acid was used to introduce hydrogen bonding and/or electrostatic interaction; it acts as a template in the formation of Fe(3)O(4)@Au/PANI nanorods. The morphology…
Abstract Thermomechanical and thermal properties of whey protein, maize prolamin protein (zein), and the laminated whey protein–zein films were studied. The dynamic mechanical (thermal) analysis (DMTA) results showed that the single zein film had higher T g than single whey protein and zein–whey laminated films. The s…
Abstract Using a unique glancing angle co‐deposition technique, face‐centered cubic Ag nanoparticles have been embedded into aligned polycrystalline MgF 2 nanorods with different topological shapes, such as tilted, zigzag, vertical, and helical nanorods. The optical properties of the artificial nanocomposite materials…
Transformer design optimization is determined by minimizing the transformer cost taking into consideration constraints imposed both by international specifications and customer needs. The main purpose of this work is the development and validation of an optimization technique based on a parallel mixed integer nonlinea…
We have systematically studied the effect of pH and 1,3-diaminopropane additive concentration on the morphology of ZnO nanorod and nanoneedle arrays grown in aqueous solution using a variety of seed layers. Increase in the growth solution pH from 6.8 to 13.2 resulted in a near doubling of the growth rate in the [0001]…
In this study, a novel sono-Fenton system based on Fe@Fe 2 O 3 core−shell nanowires was used to degrade a recalcitrant pollutant, pentachlorophenol (PCP). We studied the influence of the pH value and the atmosphere on the degradation efficiency and the production of oxidative free radicals (such as ·OH radicals). The…
The Raman spectra of ${\text{Bi}}_{2}{\text{CoMnO}}_{6}$ (BNMO) thin films, grown on (001)-${\text{SrTiO}}_{3}$, (001)-${\text{NdGaO}}_{3}$ (NGO), and (110)-${\text{DyScO}}_{3}$ substrates, have been measured in the temperature range 80--700 K. The spectra are similar to those of ${\text{La}}_{2}{\text{NiMnO}}_{6}$ an…
The paper proposes a new fixed-point method for solving time-stepping hysteretic field problems. The method is aimed to speed up the convergence of the fixed-point solution and enhance the applicability of the fixed-point iteration. The method makes use of the differential reluctivity and produces a locally convergent…
The ability of gypsum, a common sulfate mineral, to host arsenic atoms in its crystalline structure, is demonstrated through experimental structural studies of the solid solutions formed upon synthetic coprecipitation of gypsum (CaSO4 x 2 H2O) and arsenic. Neutron and X-ray diffraction methods show an enlargement of t…
Nanofilms of Y-doped zirconium pyrophosphate, with a molar composition of Y0.95/Y0.05/P2.64, exhibit high proton conductivities with an area-specific resistance of 0.085 Ω cm2. The films are very stable, even when operating in the flow of dry air at 340 °C for a prolonged period of time (see figure).
This paper introduces a novel technique for iron loss minimization of wound core transformers. The proposed technique involves the evaluation of appropriate design variables of wound cores constructed by a combination of standard and high magnetization grade steel. The evaluation of the optimum design variables of the…