Materials Literature
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Abstract Electronic structure and magnetic properties of half‐Heusler FeV 1– x Mn x Sb, CoTi 1– x Mn x Sb and RhZr 1– x Mn x Sb for x ≤ 0.1 are studied from KKR‐CPA computations. Ordered compounds exhibit an energy gap at the Fermi level as large 0.45 eV (FeVSb), 0.95 eV (CoTiSb), and 1.14 eV (RhZrSb). Mn atoms dilute…
ABSTRACT Without knowing the dynamic constitutive relation of materials under high strain rates, no wave propagation can be correctly analyzed. A Series of experimental and theoretical investigation at high strain rates revealed that the nonlinear viscoelastic behavior of polymers and the related composites are well d…
Starting with Si‐C‐N(‐O) amorphous powders, and using the electric field assisted sintering (EFAS) technique, silicon nitride/silicon carbide nanocomposites were fabricated with yttria as an additive. It was found that the material could be sintered in a relatively short time (10 min at 1600°C) to satisfactory densiti…
Abstract The alkali leaching of two aluminosilicates, kaolinite and metakaolinite, with aqueous NaOH has been studied. Both silicates gave hydroxysodalite (HS) with or without the evanescent zeolite NaA. X-ray diffraction and high-resolution 29 Si and 27 Al MAS-NMR spectroscopy provide information about the reaction s…
After summarizing the harmonic approach to topological coordinates and the null space embedding of graphs, three-coordinated tiling of the plane by hexagons, pentagons, and heptagons are presented and used for the construction of tubular, toroidal, and helical carbon structures. Physically realistic 3D geometries are…
ABSTRACT: The astringency stimulus perceived when chitosan is dissolved in acidic medium and the development of turbidity when the biopolymer interacts with saliva were investigated by sensory and chemical tests. Sensory tests showed a high correlation among the judges as astringency intensity increased when solution…
Reactive dyes constitute a significant portion of colorants used in industries ranging from the textile industry to the paper industry. In most cases, the effluent streams from textile plants are highly colored, and treatment methods for dye decolorization such as chemical oxidation need to be explored. The oxidation…
Colloidally prepared CdS/HgS/CdS quantum dot quantum well nanocrystals and CdS/HgS/CdS/HgS/CdS double quantum well nanocrystals stabilized with polyphosphates have been investigated by photoelectron spectroscopy with tuneable synchrotron radiation. High-resolution spectra reveal in addition to a bulk species also a su…
The synthesis and mesomorphic behaviour of twenty compounds belonging to two new series of seven-ring esters derived from 2-cyanoresorcinol are reported. Many homologues of both series exhibit the B7 mesophase. In addition, some of the lower homologues exhibit a mesophase which shows textural features similar to that…
In Saccharomyces cerevisiae, which uses the nonlinear pathway of arginine biosynthesis, the first two enzymes, N-acetylglutamate synthase (NAGS) and N-acetylglutamate kinase (NAGK), are controlled by feedback inhibition. We have previously shown that NAGS and NAGK associate in a complex, essential to synthase activity…
This is an introductory manual for Ion Assisted Deposition (IAD) procedures of thin films. It is addressed to researchers, post-graduates and even engineers with little or no experience in the techniques of thin film deposition. It reviews the basic concepts related to the interaction of low energy ion beams with mate…
A brief survey of the chemical structural analogies and differences between graphite oxide and fullerene ozopolymers or polymeric fullerene oxides (PFO) is presented. Graphite oxide is the product of oxidation of graphite prepared with strong oxidizing agents while PFO is the products formed by prolonged ozonation of…
Abstract Composites that incorporate precipitated silica into a vulcanized rubber were investigated for dynamic mechanical properties. Comparing different types of filler, it was found that the mean distance between particles did not alter Payne effect. On the contrary, the amount and morphology of the fillers played…
An ultrasonic method is used to disperse iron oxide particles of two different sizes in an epoxy vinyl ester resin. The dispersion quality is assessed from sedimentation, density measurements, and scanning electron micrographs. By varying parameters such as power and duration of sonication, optimum dispersion conditio…
Characterization of defect and impurity reactions, dissociation, and migration in semiconductors requires a detailed understanding of the rates and pathways of vibrational energy flow, of the energy transfer channels, and of the coupling mechanisms between local modes and the phonon bath of the host material. Signific…
The Large Scale Test Facility (LSTF) is a full-height and 1/48 volumetrically scaled test facility of the Japan Atomic Energy Research Institute (JAERI) for system integral experiments simulating the thermal-hydraulic responses at full-pressure conditions of a 1100 MWe-class pressurized water reactor (PWR) during smal…
Abstract Magnetic and electrical properties of Sm 1– x Sr x MnO 3 (0 ≤ x ≤ 0.8) single crystals have been studied and the T – x phase diagram has been revised. The compensation points of spontaneous weak ferromagnetic moment have been observed for pure SmMnO 3 and for low doped compositions (0 ≤ x < 0.05). For 0.4…
The development of a novel procedure based on microwave (MW) heating allowed to obtain a soluble derivative of Single Wall Carbon Nanotubes (SWNTs) by grafting poly(ethylene glycol) (PEG) chains to shortened SWNTs. The use of MW irradiation remarkably enhanced reaction rates compared to similar syntheses based on conv…
Abstract The correlation between the molecular architecture, morphology, and micromechanical deformation behaviour of styrene/butadiene (SB) block copolymers with different architectures (linear and star block copolymers, total styrene content, Φ ST = 0.74) was studied using dynamic mechanical analysis (DMA), uniaxial…
Abstract Micro‐Raman spectroscopy has been used to investigate the chemical micro‐heterogeneity of multiphase‐separated poly(ether urethanes) (PETU). Analysis of PETU cross‐sections by means of micro‐Raman spectroscopy revealed the nearly complete absence of soft segments in AI aggregates (called globules). These aggr…