Materials Literature
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Five types of non‐symmetric calamitic dimers were synthesized to investigate the effect of the core structure and length of the spacer on mesomorphic properties. Two non‐symmetric dimers containing a troponoid and benzenoid unit showed smectic A and C phases whereas the corresponding benzenoid dimers showed no mesopha…
Processes like ultrasound, chlorination and filtration-adsorption were compared to eliminate microorganisms and to adjust established parameters of public drinking water. A mini water treatment plant (WTP-CB), in pilot scale, was projected and built to evaluate each process influence as: decontamination, coagulation-f…
Potassium tetraperoxomolybdate (VI) K 2 [Mo(O 2 ) 4 ] was prepared, and its X-ray powder diffraction pattern was recorded at low temperature (258 K). The unit cell parameters were refined to a =10.7891(2) Å, α =64.925(3)°, space group R −3 c (167), Z =6. The compound is isostructural with potassium tetraperoxotungstat…
Barium strontium titanate (BST) thin films have been intensively studied as a frequency and phase agile materials for the tunable microwave devices such as tunable filter, phase shifter and phased array antennas. The dielectric properties of BST thin films, including the dielectric constant, dielectric loss and tunabi…
Abstract The performance of a fluidized cracking catalyst additive prepared from caustic-modified kaolin microspheres for gasoline S reduction was investigated using N 2 adsorption, infrared acid-site characterization, X-ray diffraction and small-scale fluid bed reactor tests. The additive exhibited improved coke sele…
The synthesis of the poly(carbonate) and poly(thiocarbonate) derived from the diphenol bis(4-hydroxyphenyl)-phenylmethylsilane and the poly(ester) derived from the same diphenol and the acid dichloride bis(4-chloroformylphenyl)-phenylmethylsilane are described. Polymers were synthesized under phase transfer conditions…
Flower‐like nanostructural ZnO has been fabricated through lower concentration gemini surfactant‐assisted hydrothermal oxidization of zinc metal at 150°C. The resultant powdered products were characterized by means of X‐ray diffraction (XRD), energy dispersive X‐ray spectroscopy (EDX), transmission electron microscopy…
The electronic structure of Cu hexafluoroacetylacetonate, crystallized with a stable nitronyl nitroxide radical [V.I. Ovcharenko, K.Y. Maryunina, S.V. Fokin, et al., Russ. Chem. Bull. 53 2406 (2004)], is calculated from first principles within the density functional theory using the SIESTA method, in two magnetic conf…
New orthophosphates K 2 Mg 0.5 Zr 1.5 (PO 4 ) 3 , Rb 2 Mg 0.5 Zr 1.5 (PO 4 ) 3 , and Cs 2 Mg 0.5 Zr 1.5 (PO 4 ) 3 are synthesized and characterized by X-ray powder diffraction and IR spectroscopy. These orthophosphates crystallize in the structure type of the mineral langbeinite (cubic system, sp. gr. P 2 1 3, Z = 4).…
This paper discusses some properties of the polypropylene (PP)/ethylene-propylene diene terpolymer (EPDM)/natural rubber (NR) blends, such as tensile properties, heat resistance, gel content, and morphology. Dicumyl peroxide (DCP) and N,N-m-phenylene bismaleimide (HVA-2) and their combination were applied in PP/EPDM/N…
The principal objective of the present study is to improve the mechanical properties of polychloroprene through the addition of montmorillonite (MMT). Three modifying cations are tested. The polychloroprene–MMT composite is characterized by Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron…
A surface-plasmon sensor, in the attenuated-total-reflection configuration, is modeled by a glass-metal-dielectric-air structure, where a dielectric film with anisotropic permittivity models the material (or particulates) to be sensed. The laser beam, polarized in the plane of incidence, is obliquely incident on the g…
Liquid crystals have a phase in between liquid and solid: the molecules can flow and drip but remain somewhat organized. The cholesteric liquid crystals prepared in this Activity use mixtures of molecules related to cholesterol that align in layers. Stacks of layers are rotated with respect to one another similar to D…
Crystal plasticity FEM simulations of plane strain compression were performed. The Texture Component Crystal Plasticity-FEM was used for the texture mapping. Two different starting textures (random and hot rolling texture) were studied using four different FE meshes and two different sets of boundary conditions. While…
BiFeO 3 material shows simultaneous ferromagnetic and ferroelectric behavior, therefore their is research interest in such materials for novel bi-functional devices. The partial substitution of Ba and Ti ions at Bi and Fe sites may affect the functional properties of the parent BiFeO 3 material. Substituted BiFeO 3 ma…
The influence of normalizing on precipitation, microstructure and texture was investigated to ascertain how these factors play a role in the improvement of magnetic properties. The present work found that normalizing of hot rolled bands led to better magnetic properties. Non-normalizing resulted in smaller precipitate…
Abstract Spider silk has attracted the interest of several researchers in recent years because it displays a unique combination of high tensile strength, high breaking strain and an ultra-low weight. Hitherto, the focus has always been on dragline and viscid silk, whereas research on spider cocoon silk is limited. In…
The interaction between copper-rich precipitates in α-iron and either vacancies or self-interstitial atoms and their clusters is studied by atomic-scale modelling. Results are compared with predictions of elasticity theory and interpreted in terms of size misfit of precipitates and defects, and the modulus and cohesiv…
(1 − x)Pb(Fe 1/2 Nb 1/2 )O 3 -xPbTiO 3 (PFN-xPT) ceramics with x = 0.13 sintered at 1200°C show diffuse phase transition and very high dielectric constant at lower frequencies. The high value of dielectric constant at lower frequencies is shown to be due to the barrier layer formation. The resistivity of the PFN-xPT c…
For enhancing the effectiveness of hydrogen water chemistry (HWC) in boiling water reactors (BWRs) in the aspects of lower hydrogen consumption and of a more effective reduction in electrochemical corrosion potential (ECP), the technique of inhibitive protective coating on structural materials was brought into conside…