Materials Literature
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Sulfur levels in both gasoline and disel fuels are being restricted because of environmental pollution concerns throughout the world. The U.S. Environmental Protection Agency has mandated the levels of sulfur which may be allowed in most road and off-road vehicles. Although there are many standard test methods availab…
The rate of cavitation with superplastic strain was investigated for a superplastic AZ61 magnesium alloy at a strain rate of 2×10−4 s−1 and temperature of 648 K, under the conditions of which an elongation of more than 250% has been found. Cavities initiated at grain boundaries. The cavitation showed a growth perpendi…
10.1360/982005-349
Poly(ethylene-co-vinylacetate) (EVA) was mixed with sodium montmorillonite (MMT) at 90/10 wt. ratio. EVA was also mixed with an organophilic montmorillonite (o-MMT) prepared by replacing Na+ in MMT with trimethylstearylammonium cation. The structure and mechanical properties of the composites were studied by scanning…
The first mesoionic nematic and smectic A mesogens derived from sydnones that are characterized by both covalent and ionic features have been synthesized and evidenced by optical, calorimetric and X-ray diffraction studies.
When produced under reducing conditions, beta-Ga2O3 is transformed into an n-type semiconductor with delocalized conduction electrons that exhibit a very strong electron spin resonance (ESR) and a strong hyperfine coupling to the gallium nuclei of the host lattice. We apply the Overhauser-shift technique to investigat…
The defoliation properties of galvannealed coating, so-called powdering and flaking, in a commercial continuous galvanizing line were investigated by scanning electron microscopy, X-ray diffraction, a roughness profiler and deep drawing test. Both aluminum content in molten zinc and galvannealing temperature were foun…
A field distribution in a rectangular waveguide filled with anisotropic single-negative (SNG) metamaterial is analyzed theoretically, numerically and experimentally. A highly simplified scenario with ideal lossless, continuous (either mu-negative (MNG) or epsilon-negative (ENG)) filling material is used in theoretical…
Widely adopted around the world, Engineering Materials 1 is a core materials science and engineering text for third- and fourth-year undergraduate students; it provides a broad introduction to the mechanical and environmental properties of materials used in a wide range of engineering applications. The text is deliber…
From the view point of both science and technology, it would be interesting and useful to examine the optical properties of isolated silicon nanocrystals (nc-Si) embedded in SiO2 matrix. A good understanding to optical properties of the nc-Si is definitely important to both the quantum physics and the applications esp…
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…