Materials Literature
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The sol-gel process has been used to prepare hybrid electrolytes composed of a poly(oxyethylene) (POE)/siloxane hybrid network doped with lithium tetrafluoroborate (LiBF4) with compositions of n between ∞ and 2.5. In this context the lithium salt concentration has been expressed in terms of the number of oxyethylene u…
A new material selection approach based on PROMETHEE method is proposed in this paper. Compared with ELECTRE method, this PROMETHEE can utilize more candidate information, thus making the selection result more reasonable. The approach is further illustrated and validated by two material selection cases. And Spearman's…
We report the experimentally observed abnormal refraction in metamaterials (MMs) consisting of ferrite rods and metallic wires with two kinds of configurations. Negative refraction (NR) and positive refraction (PR) are demonstrated in an MM constructed with parallel-arranged rods and wires. The frequencies of both NR…
An accurate finite cluster approach based on localized Wannier orbitals is applied here to bulk TiO 2 as a prototypical extended transition metal oxide. The quasi-particle band structure, an extended property of the infinite solid, is successfully reproduced within a finite local cluster approach at the Hartree–Fock l…
Abstract The powder X‐ray diffraction patterns of LaFe 11.5 Si 1.5 compounds annealed at different high temperatures from 1323 K (5 h) to 1623 K (2 h) show that a large amount of 1:13 phase begins to form in LaFe 11.5 Si 1.5 compound annealed at 1423 K (5 h). In the temperature range from 1423 to 1523 K, α‐Fe and LaFe…
Polyurethane/epoxy resin (PU/EP)/dimethyl sulfoxide modified kaolin (PU/EP/K-DMSO) interpenetrating network composites were prepared by in situ intercalation method. FT-IR showed that hydrogen bonding existed between kaolin and PU/EP matrix. The structure of composites was characterized by XRD, SEM and TEM. The result…
The MQ silicone resin was synthesized by using chlorotrimethylsilane and tetraethyl orthosilicate and its structure was analyzed by means of Fourier transform infrared spectroscopy, 29Si-nuclear magnetic resonance and gel permeation chromatography. The silicone based pressure sensitive adhesive was obtained by condens…
Owing to a high amount of stress, seam failure in workwear fabrics makes the fabric unsuitable although the fabric strength is high. It is therefore important to predict the seam strength to ascertain the performance of the garments during use and determine the required thread strength and stitch density to match the…
The objective of this study was to evaluate the influence of crossings between sheep breeds on the intrinsic quality of leather. It was used the skins of 36 lambs (18 females and 18 males), resulting from crosses between ewes of a native breed from the Brazilian state of Mato Grosso do Sul and rams of the same native…
A differential structure which has the ability to reject external vibrational noise for Metglas/Pb(Zr,Ti)O(3) (PZT) fiber-based magnetoelectric (ME) heterostructures has been studied. This type of ME structure functions better than conventional sensors as a magnetic sensor when used in an environment in which vibratio…
In this work, it is studied the application in hyperthermia of a microwave focusing device based on meta-materials. The device consists of a planar array of split-ring resonators placed between two parallel metallic plates and it is fed by a small loop antenna which excites the split-rings. The device is modelled as a…
We optimized the fundamental composition and additives in a semiconducting V 2 O 5 –P 2 O 5 –TeO 2 glass system to develop lead-free low-melting glass suitable for low-temperature sealing below 400 °C. Glass with a composition of 55.7V 2 O 5 –19.8P 2 O 5 –23.5TeO 2 (mol %) has a low glass transformation temperature (…
Close to sinusoidal substrates, simple fluids may undergo a filling transition, in which the fluid passes from a dry to a filled state, where the interface remains unbent but bound to the substrate. Increasing the surface field, the interface unbinds and a wetting transition occurs. We show that this double-transition…
Two Fe-based nanopowders were synthesised using microwave torch discharge at 1 bar. The main channel of the discharge was operating in Ar, which flowed through the central nozzle of an electrode, whereas the reactive mixture H 2 /Fe(CO) 5 was added through a concentric outer nozzle. Besides rarely observed γ-Fe partic…
The structural, elastic, and electronic properties of a series of icosahedral phases, such as boron subcarbides B 12 C 3 and B 13 C 2 , subnitride B 12 N 2 , and suboxide B 12 O 2 , have been studied in the framework of the SCC-DFTB method. It has been found that the B 12 C 2 and B 13 C 2 phases manifest metal-like pr…
Many efforts had been reported to modify the structure of electropun nanofibers in order to obtain superior functional properties of poly(vinyl-alcohol) (PVA). This paper discusses the influence of chitosan on the morphology of electropun PVA nanofibers and their related properties. Spider–net and fiber–bridging struc…
A transparent, efficient ZnO ultraviolet Schottky detector with indium tin oxide (ITO) as a metallic contact layer is fabricated on ITO-coated glass substrates by cw CO 2 laser evaporation. The device behavior changes from near ohmic to Schottky in the current–voltage characteristics after hydrogen peroxide treatment…
The optimization of silicon oxycarbide (SiOC) synthesis (sol-gel/pyrolysis) is described, starting from methyltriethoxysilane, dimethyldiethoxysilane, tetraethoxysilane, ethyltriethoxysilane and propyltriethoxysilane. Variation of final elemental composition was tested via change of monomer ratios and combinations. Th…
In this work, ball milling is applied on β-K2Bi8Se13 compounds in order to explore the potential of the process for the fabrication of nano-based material. Polycrystalline β-K2Bi8Se13, synthesized from melt, was ball milled under inert atmosphere. Powder x-ray diffraction showed a significantly increased disorder with…
It has been proved that littoral diatoms provide a useful marker for detecting localised changes resulting from uneven anthropogenic disturbances or intermittent releases of sewage along the shorelines of lakes. This study tested the spatial resolution at which this general observation occurs, by selecting areas with…