Materials Literature
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Several efforts have been made to predict the mechanical properties of structural foams, mainly under tensile and flexural loading modes. The prediction of the mechanical behavior of foams subjected to impact loads remains, however, an unfulfilled challenge. Several investigations have studied the variation of impact…
A sterically encumbered m-terphenyl oxacyclophane substituted with two aryl iodide substituents has been prepared as a versatile monomer for the preparation of π-conjugated polymers. The monomer has been used to prepare a poly(p-phenylene ethynylene) derivative (P1) incorporating oxacyclophane units as canopies that s…
A layer-by-layer assembly technique is used to coat layers of nano-thin-films of pH indicator on a U-bend optical fibre to create an effective sensor, using neutral red as the active element. The experimental results characterizing such a pH sensor shows a wide pH sensing range (from pH5 to pH10) fast response.
We report on the results of a large-scale molecular dynamics simulation study of shock-wave propagation in pristine amorphous silicon carbide and carbon-nanotube-reinforced amorphous silicon carbide matrix composites. We seek to understand the effects of ensembles of aligned nanotubes, both transversely and longitudin…
Liquid crystalline phthalocyanine bearing eight oligo(ethyleneoxy) peripheral substituents forms homeotropically aligned films on the hydrophilic surface, whereas planar alignment with a random distribution of the column directors occurs on the hydrophobic surface.
We study the electronic transport in a graphene-based ferromagnet/insulator/ d -wave superconductor (F/I/S) junction by use of the Dirac-Bogoliubov-de Gennes equation. The effects of spin polarization in the F region, barrier strength in the I region, and Fermi wave vector mismatch between the F and S regions are take…
Eu2+-doped silicate glasses were prepared in the system 42SiO2- gammaCaO-(38gamma)SrO-20MgO- 0.2EuO (gamma = 0, 10, 20, 30, 38) by melting under reducing atmosphere. Glass ceramics precipitated with M2MgSi2O7:Eu2+(M = Sr, Ca) phosphor were obtained by heat-treatment of the glass. They showed broad emission band due to…
One-dimensional core-shell polymer nanowires offer many advantages and great potential for many different applications. In this paper we introduce a highly versatile two-step template wetting process to fabricate two-component core-shell polymer nanowires with controllable shell thickness. PLLA and PMMA were chosen as…
We present the results of time and temperature dependent deformation of two azobenzene materials with different dipole moment during the process of surface relief grating formation. The effect of chromophore orientation on grating formation in these films was studied in situ using continuous and pulselike exposure tec…
The selective catalytic oxidation (SCO) of ammonia has been investigated on a portion of the H-ZSM5 framework which contains 5T atoms by using density functional theory, representing H-form zeolites. The mechanism was subdivided into three main blocks: (I) the direct reaction of NH 3 with oxygen, leading either to HNO…
The Ba0.65−xSr0.35MgxTiO3 ceramics was prepared by conventional solid method. The effects of the Mg2+ content on the crystal structure and dielectric properties of Ba0.65−xSr0.35MgxTiO3 ceramics were investigated. The results show that as the Mg2+ content increases, the influence of Mg2+ on the crystal structure of Ba…
The pattern of partial discharge (PD) occurrence at a defect site within a solid dielectric material is influenced by the conditions of the defect site. This is because the defect conditions, mainly its size and location determine the electric field distributions at the defect site which influence the patterns of PD o…
Er2O3 coating for tritium permeation barrier has been fabricated on steel substrates by a filtered arc deposition method at room temperature and 973 K. Thermal expansion of the oxide layer and the substrate induced peel-off of the coating. The non-crystalline layer is thought to play a role in forming a uniform surfac…
In HVDC transmission systems, the oil and oil-impregnated pressboard insulation of converter transformers is subjected to composite AC and DC voltage. Therefore, a study on breakdown characteristics of this insulation under AC, DC and composite AC and DC voltage is essential. In this paper, breakdown tests on transfor…
Abstract The tetraborates β ‐FeB 4 O 7 and β ‐CoB 4 O 7 were synthesized under high‐pressure/high‐temperature conditions of 10.5 GPa/900 °C ( β ‐FeB 4 O 7 ) and 7.5 GPa / 1250 °C ( β ‐CoB 4 O 7 ) in a Walker‐type multianvil apparatus. Single crystal structure determinations of both compounds revealed an isotypy to β ‐…
Agarose gel media reduce convection and prevent crystal sedimentation, resulting in the production of high-quality protein crystals. However, crystallographers have only tested agarose gel at concentrations between 0.0 and 0.6% (w/v), where it exhibits low gel strength. The effect of agarose gel on protein structures…
The present study aims to develop a mechanistic understanding of the thermal-hydraulic processes in a vapor explosion, which may occur in nuclear power plants during a hypothetical severe accident, involving interactions of high-temperature corium melt and volatile coolant. Dynamics of the hot liquid (melt) droplet an…
Undoped and zinc oxide (ZnO) doped molybdenum oxide (MoO3) films were prepared by RF magnetron sputtering technique. The influence of doping and post annealing temperature on the structural and optical properties of these films were investigated systematically using X-ray diffraction (XRD), energy dispersive X-ray ana…
Gold nanoparticles grafted with poly(N-isopropylacrylamide) (PNIPAM) are rendered amphiphilic and thermosensitive. When spread on the surface of water, they form stable Langmuir monolayers that exhibit surface plasmon resonance. Using Langmuir balance and contrast-matched neutron reflectivity, the detailed structural…
The simulation of the Raman spectra of nanostructured materials, where the effects of frequency shift and asymmetric broadening of the Raman modes play an important role, can be very useful in systematic characterization of these materials.Use of phonon confinement model for calculating Raman spectra of different nano…