Materials Literature
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Abstract The introduction of the cationic luminescent iridium(III) and ruthenium(II) complexes into negatively charged poly(l-glutamic acid) (P(Glu)) as a polymeric scaffold, wherein control of the conformational change of P(Glu) was achieved, was allowed to induce the tuning of the emission properties and energy tran…
One method to face the effects of naphthenic acid corrosion in petroleun refining plants is to use alloys with good resistance to this kind of corrosion. For this purpose, molybdenum additions to chromium containing steels are specially recommended. In this work, experimental Fe-9Cr-xMo (x = 5, 7 and 9 wt. (%)) ingots…
Abstract In this study, a series of PI/TiO 2 nanohybrid materials were prepared from polyamic acid of 3,3′,4,4′‐benzophenonetetracarboxylic dianhydride/3,3′‐diaminodiphenyl sulfone, and titania precursor by the sol‐gel method. The titania content in the hybrid system was varied from 0 to 5 wt %. The physical and mecha…
Six coordination compounds: [Li(H2O)4]+·hmta·Cl−, [Li(H2O)4]+·hmta·I−, [Na(H2O)4(hmta)] 2 2+ ·2H2O·2Br−, [Na(H2O)4(hmta)] 2 2+ ·2H2O·2I−, [K(H2O)(hmta)I] n and [Rb(H2O)(hmta)I] n , have been synthesized and characterised by IR spectroscopy, thermogravimetry coupled with differential thermal analysis, elemental analysi…
Purpose The present study is concerned with the application of a nonlinear frequency analysis approach to the detection and location of water tree degradation of power cable XLPE insulation without turning off electric power. Design/methodology/approach The use of power cable system responses to power line carrier sig…
Novel photochromic amphipathic molecules, KMR-AZn (Gd-DTPA-AZCn), composed of hydrophilic Gd-DTPA and hydrophobic alkylated azobenzene were prepared. In aqueous environment, KMR-AZn indicated self-assembly. The resulting aggregates were demonstrated to be able to include a hydrophobic drug substitute (hydrophobic fluo…
Grain refinement in magnesium is evaluated in the present paper. Equal Channel Angular Pressing is used to process commercially pure magnesium. Processing was carried out at 523 K which is lower than the temperature used in other papers on the literature. The grain structure was evaluated throughout the deformation zo…
Abstract Mesoporous TiO2 nanoparticles were synthesized using different carboxylic acids as organic additives in a very short reaction time (10 min) in supercritical methanol. Solid spherical mesoporous TiO2 nanoparticles were obtained using phthalic acid, whereas hollow spherical mesoporous TiO2 nanoparticles were ob…
Abstract Ultraviolet‐curable nanocomposites containing organically modified nanoclays were prepared to serve as barrier coatings against oxygen and water permeation. A novel in situ synthesis technique was used to produce well‐dispersed clays in an unsaturated polyester polymer before crosslinking. The in situ dispers…
Purpose The purpose of this paper is to evaluate, by experimental investigation, the wear and friction performances of porous bearings under different operating conditions. Design/methodology/approach Two different compositions of self‐lubricating bearings were chosen: 90 percent Cu+10 percent Sn and 90 percent Cu+9 p…
Abstract Polymer/inorganic nanocomposites were significant hybrid materials because of their unique properties. The surface of bare nanoparticles (b‐TiO 2 ) was modified by aminopropyl trimethoxy silane to obtain grafted TiO 2 (g‐TiO 2 ) nanoparticles for the improvement of nanoparticles dispersion. The b‐TiO 2 and re…
A new dinuclear terbium complex [Tb(2)(4-msal)(6)(H(2)O)(4)]·6H(2)O (1) (4-msal = 4-methylsalcylate) was synthesized. Its structure was determined by single crystal X-ray diffraction, and the complex was characterized by PXRD, FT-IR, fluorescence, TGA and DTA. Complex 1 exists as discrete molecules that are linked by…
The present paper considers the microstructures of Al–Mg/oxide ceramic interpenetrating composites made by a pressureless infiltration technique. The composites were produced using an Al–10 wt.% Mg alloy with two oxide ceramic foams, spinel (MgAl2O4) and mullite (Al6Si2O13), at 915 °C in a flowing N2 atmosphere. Full…
The addition of nano/micro silica into unsaturated polyester resin (UPR) results in the improvement of the electrical properties of Silica-UPR composites. The surface, volume resistivity, dielectric strength, dissipation factor and dry arc resistivity of nano silica-UPR composites were found to improve significantly.…
Purpose The paper proposes and presents a comprehensive and integrated circuit model for investigating the behaviour of partial discharges occurring in voids inside the solid insulations of medium and high voltage cables. Design/methodology/approach The model is based on the well‐known three capacitors model, which is…
One of the most abundant components of the enterocyte brush border is the actin-based monomeric motor, myosin-1a (Myo1a). Within brush border microvilli, Myo1a carries out a number of critical functions at the interface between membrane and actin cytoskeleton. Proper physiological function of Myo1a depends on its abil…
A detailed optical characterization of vertically aligned ZnO microrods (μRs) grown using a Ni-based catalyst was carried out by excitation-power- and temperature-dependent photoluminescence (PL) measurements. Low-temperature PL spectra of ZnO μRs are dominated by near-band-edge (NBE) emission consisted of a series of…
Abstract We review and compare two models recently used to describe electronic transport in polymer fibers/nanotubes and carbon nanotubes including graphene nanoribbons, namely, variable range hopping (VRH) in different versions and their modifications on the one hand and electric-field-induced phonon-assisted tunneli…
Abstract Nanogels are polymer nanoparticles with three-dimensional networks. Recently, various nanogels have been designed, with a particular focus on biomedical applications. In this review, we describe recent progress in the synthesis of functional nanogels by self-assembly of associating polymers and nanogel engine…
Abstract Poly(arylene ether nitrile) (PEN) end‐capped with phthalonitrile (PEN‐n) was synthesized by incorporating phthalonitrile into the terminals of PEN. The as‐prepared flexible PEN‐n (after elevated temperature treatment) was characterized by infrared spectroscopy, nuclear magnetic resonance, gel permeation chrom…