Materials Literature
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Abstract We present a quantum chemical analysis of the molecular structure and first hyperpolarizabilities of a series of stilbazolium ions and compare their results with corresponding neutral molecules. The molecular geometries are obtained via B3LYP/6‐31G** optimization, including the self‐consistent reaction field/…
The increasing interest in left-handed medium (LHM) requires a formulation capable of a full analysis of wave propagation in such materials. However, the conventional perfectly matched layer (PML) absorbing boundary condition (ABC) is unstable when it is extended to truncate the boundary of LHM. This is a consequence…
Multiferroic materials where ferromagnetism and ferroelectricity coexist are rare. We have succeeded in synthesizing new multiferroic materials Bi2M MnO6 (M = Ni, Co) at high pressure of 6 GPa. The crystal structures of these compounds are a heavily distorted double-perovskite (space group C2), with M 2+ and Mn4+ ions…
Polymer-laminated electrochromic devices composed of WO 3 and Ni͑OH͒ 2 films were fabricated on indium tin oxide ͑ITO͒coated glass and polyethylene terephthalate ͑PET͒ substrates.In each of the devices, data on the transmittance modulance, coloration efficiency, and response time were collected.The transmittance modul…
This paper investigates the dynamic surface tension of aqueous film forming (AFFF) and fluorine-free (FF) foam solutions by pendant drop tensiometry. Additional experiments are conducted to measure the interfacial tension between the foam solutions and two hydrocarbon liquids, n-heptane and diesel oil. The pendant dro…
Low-temperature solution-phase polycondensation of 1,1′-ferrocenedicarboxylic acid chloride with different aromatic diamines was carried out in tetrahydrofuran in the presence of triethylamine to afford ferrocene-containing aramids. The products were characterized by their solubilities, inherent viscosities, elemental…
While numerous publications deal with the properties and applications of porous silicon (PS), some of the related topics are not complete or could be investigated from different aspects. Therefore, the main objective of this thesis is to provide novel information associated with the optical and chemical properties of…
The ytterbium complex [Yb((S)-THP)](3+) ((S)-THP = (1S,4S,7S,10S-tetrakis(2-hydroxypropyl)-1,4,7,10-tetraazacyclododecane) is investigated in solution through NMR, near-IR absorption, and CD spectroscopy. Quantitative analysis of the paramagnetic pseudocontact NMR shift shows Lambda helicity of the ligand cage around…
This work studies the occurrence of sol/gel transition and the gel rheology for chitosan solution under various conditions. Experiments were conducted in an oscillatory shear apparatus with small amplitude, using a Rheometrics SR-5 rheometer, with Couette and parallel plate geometries. The experimental results demonst…
Anomalous optical birefringence and optical rotation have been observed in a liquid crystal phase comprising of W-shaped liquid crystal molecules with hydrogen bonds. The texture of this phase exhibits characteristic chiral filaments, which form strongly segregated chiral domains similar to the B4 phase of conventiona…
This research was developed aiming to evaluate the effects of board density and melamine-urea-formaldehyde resin on the properties of particleboard for semi-structural applications. The boards were manufactured with nominal density of 0.65 g/cm³ and 0.90 g/cm³ using urea-formaldehyde resin as control and melamine-urea…
Hydrogen desorption properties of a mixture of hydrogenated nanostructural graphite CnanoHx and lithium hydride LiH are demonstrated in this paper, where CnanoHx was synthesized from graphite by ballmilling under 1 MPa hydrogen for 80 h. First of all, we clarified the hydrogenated properties of CnanoHx synthesized und…
Abstract The investigation concerns the effect of a bulky substituent at the pyrrole nitrogen atom on the orientation and regioselectivity of pyrrole phosphorylation with phosphorus(III) halides. As shown, phosphorylation of N‐iso‐propylpyrrole with phosphorus tribromide or trichloride proceeds nonregioselectively at…
The different crystal structures of ferromagnetic Ni2MnGa have been calculated using density functional theory (DFT) with special emphasis on the modulated structures 10M and 14M. These are important for understanding the stability of Ni2MnGa martensites and their functionality as shape-memory materials. The modulated…
Abstract This article begins with a discussion on the environmental factors that induce corrosion in magnesium alloys. It reviews the factors that determine the severity of different forms of localized corrosion, namely, galvanic corrosion, corrosion fatigue, and stress-corrosion. The article discusses corrosion prote…
The objective of this study was to assess food polymers for their ability to form edible films using extrusion technologies. Screening of a variety of food ingredients identified pectin, pea starch and gelatine/sodium alginate blends (1:4) as potential materials for formation of stable films. Extrusion temperature, po…
This paper introduces a corona-resistant nano-inorganic/organic insulation material. Chemical constitution and microscopic pattern of the inorganic filler in a corona-resistant magnetic wire insulating coating was tested and analyzed. The electricity, thermal effect of packed nano TiO/sub 2/ powders during the course…
Antimonic acid Sb2O5·4H2O with the pyrochlore structure is a well known ion-exchanger that is selective for Sr2+ in mildly acidic solution. An enhancement of the ion exchange properties of antimony-based pyrochlore materials, with respect to Cs+ and Sr2+, was previously reported by Möller and co-workers to be achievab…
Abstract Clay minerals show various chemical compositions according to numerous cationic substitutions occurring in their interlamellar space, tetrahedral and octahedral sheets. Chemical analyses are often performed at macroscopic scale and the deduced structural formulae do not necessarily reflect the actual crystal…
TiB2–SiC system composites were prepared using TiB2 and SiC powders as starting materials by an arc-melted method in Ar atmosphere. The TiB2–SiC system was binary eutectic. The eutectic composition was 40TiB2–60SiC (mol%) showing a labyrinth texture. The hardness of the eutectic composite was 27 to 30 GPa at the loads…