Materials Literature
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Herein we report on the synthesis, optimization of the synthetic procedure, functionalization, and characterization of cubic and spherical superparamagnetic magnetite nanoparticles. Spherical nanoparticles (16 ± 2 nm) were synthesized using oleylamine and oleic acid, and cubic (20 ± 2, 5 ± 0.5 nm) nanoparticles were s…
Molecular interactions between benzoic acid and cations and water contained in montmorillonite clay interlayer spaces are characterized by using variable temperature diffuse reflection infrared Fourier transform spectroscopy (VT-DRIFTS). Using sample perturbation and difference spectroscopy, infrared spectral changes…
We show that the linear polarization state of electromagnetic waves can be efficiently rotated to its orthogonal direction by an alternative design of anisotropic plasmonic meta-surfaces. Numerical results demonstrate that the reflection coefficient converting to cross-polarization after reflection is larger than 71%…
Various morphologies of silica nanoparticles were synthesized by a microwave-assisted Pechini method. Silica nanostructures were synthesized via a fast reaction between tetra ethyl ortho silicate and ammonia at presence citric acid and other effective agents in Pechini procedure. Then for preparation of polymer-matrix…
The present study provides a comprehensive theoretical analysis of the superconducting phase in selected lithium-decorated bilayer graphene nanostructures. The numerical calculations, conducted within the Eliashberg formalism, give quantitative estimations of the most important thermodynamic properties such as the cri…
We propose a bandwidth reconfigurable spatial filter using frequency selective surfaces (FSS) combined with phase-change materials (PCMs), vanadium dioxide (VO2) for advanced terahertz (THz) applications. The FSS filter is simulated using sapphire as substrate and employs circular loops FSS with VO2rings in between. S…
Curing induced residual stress of epoxy-alumina composites influences properties of large scale epoxy casting products like Ultra High Voltage(UHV) GIS spacer. It will result in defects like cracks and voids which will worsen electric field distribution and degrade insulation characteristics of spacers, then endanger…
White light emission NaY(MoO4)2:Tm, Dy, Eu was obtained, and the CIE is (0.33, 0.33). Regular sphere-like NaY0.5La0.5(MoO4)2:Eu presents the highest red emission and colour purity. (Picture: Guanzhong Lu et al.,10.1002/crat.201500095 pp. 580–593, in this issue)
With ferrocene as a precursor, carbon-encapsulated iron nanoparticles are synthesized through detonation of a gas mixture of hydrogen and air in a titanium detonation tube. XRD and TEM characterization shows that a downward trend in the size of particles can be observed with increasing amounts of the precursor. Howeve…
In order to address an important problem in Computational Materials Design, we have demonstrated the feasibility of an algorithm which rapidly scans through various surface configurations of two single crystals selected from a crystal structures database and identifies those pairs which are likely to form stable heter…
The enthalpies of formation of natural trioctahedral smectite from elements were determined for the first time by high-temperature melt solution calorimetry using Tian-Calvet microcalorimeter: Δ f H 0(298.15 K): −5799.1 ± 5.1 kJ/mol for saponite Ca0.1Na0.1K0.1(Mg2.6Fe 0.1 2+ Fe 0.2 3+ )[Si3.6Al0.4O10](OH)2 (Arkhangels…
We report synthesis of the functional ZnO nanostructures (nanowires, nanorods) by a cost-effective and efficient method; called composite-hydroxide-mediated (CHM) approach. Effect of the processing temperature on the particle size, morphology, and subsequently morphological dependent optical emissions is investigated.…
Polyfluorenes (PFO) derivatives, containing different ratios of heterocyclic, electron-withdrawing benzo[ c ]cinnoline moieties, BF10, BF25, and BF50 were synthesized by Suzuki coupling reaction. Photoluminescence (PL) spectra showed red-shifted emission peaks at around 500 nm for dilute polymer solutions and at aroun…
On this journal, modeling relation of rotor speed and rotor diameter toward yarn tension on take-off nozzle has been validated by theoretical approach and numeric computation.It shows that value of yarn tension is F=(1,4.10 -13 )Tt n R 2 d R 2 [cN]. Excessively high spinning tension always results in an intolerable in…
In the present work, the phase constitution and magnetic properties of the LaFe11.14Co0.66Si1.2-xGax (where x = 0.1, 0.2, 0.3) alloys, were investigated. It was revealed that increase of Ga content in the alloy composition causes the rise of lattice parameter of the La(Fe,Si)13-type phase, which causes increase of the…
The electronic transport properties of monolayer graphene are presented with an Ensemble Monte Carlo method where a rejection technique is used to account for the occupancy of the final states after scattering. Acoustic and optic phonon scatterings are considered for intrinsic graphene and in addition, ionized impurit…
The thermal conductivity of three single crystal samples of n-type gallium nitride with electron densities of 4.0 × 1016, 2.6 × 1018, and 1.1 × 1020 cm−3 has been determined in the temperature range 4–320 K. The measurements were carried out within the ab plane using the stationary method. The thermal conductivity dep…
In situ polymerization of pyrrole initiated by ammonium persulphate was carried out in the presence of molybdenum trioxide by the chemical oxidation method. The obtained composites containing various amounts of molybdenum trioxide (up to 50 wt %) exhibit semi-crystalline behavior. FTIR-spectroscopy showed that the str…
The possibility of modifying the elastic polyurethane foam with tetraethoxysilane is studied. The techniques of polyurethane sample preparation and physicomechanical tests are described, and the properties of the samples are presented. The optimal concentration of the modifying additive for elastic polyurethane is det…
In prior work (Biswas & Chatterjee 2014 Proc. R. Soc. A 470, 20130817 (doi:10.1098/rspa.2013.0817)), we developed a six-state hysteresis model from a high-dimensional frictional system. Here, we use a more intuitively appealing frictional system that resembles one studied earlier by Iwan. The basis functions now have…