Materials Literature
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Sn was employed in Ge 2 Sb 2 Te 5 to accelerate operation speed of phase change random access memory (PRAM). Crystallized Sn-doped Ge 2 Sb 2 Te 5 showed face centered cubic (fcc) or hexagonal close packed (hcp) structures upon heat treatment, which was similar to that of Ge 2 Sb 2 Te 5 . However, Sn doping increased t…
Phase equilibria in the BaO-Bi 2 O 3 -B 2 O 3 system have been investigated by X-ray powder diffraction analysis and DTA. Quasi-binary sections have been determined, and an isothermal section of the system in the subsolidus region has been constructed. The BaO-Bi 2 O 3 -B 2 O 3 ternary system has been divided into 22…
Abstract Concomitant immobilization of zirconocene (Cp 2 ZrCl 2 ) into a silica matrix was performed during the SiO 2 synthesis through non‐hydrolytic sol‐gel method. Two different routes, varying the SiCl 4 :Si(OEt) 4 ratio were evaluated in terms of zirconocene content and catalyst activity in ethylene polymerizatio…
We report on the inverse flexoelectric effects observed in a nematic liquid crystal with a small positive dielectric anisotropy subject to static and very low frequency (<1 Hz) a.c. fields. The Bobylev–Pikin flexobands appear at a temperature‐dependent d.c. threshold. Under square wave excitation, a new type of transi…
Neste trabalho foi sintetizado o poli(álcool vinílico) (PVOH) através da hidrólise alcalina do poli (acetato de vinila). As mantas nanofibrílicas de PVOH foram processadas através da eletrofiação das soluções de PVOH/água e PVOH/água/cloreto de alumínio, ambos na concentração de 12,4% m/v. A morfologia das fibras foi…
Parameters of Snoek relaxation in binary alloys of iron with Co, Ge, Al, and Si have been studied. The concentration of Al was varied from 1.5 to 16 at. %, and that of Si, from 3 to 10 at. %, in binary (Fe-Al, Fe-Si) and ternary (Fe-Al-Si) alloys. It has been shown that Co and Ge added to α-Fe in amounts to ∼3 at. % o…
Surface-modified Poly(ethylene terephthalate) (PET) fabrics were prepared through thionylchlorided cellulose nano-crystal (CNC) reacting with hydroxyl groups at the surface of the alkali-etched PET fabrics. X-ray photoelectron spectroscopy (XPS), field-emission scanning electron microscopy (FE-SEM) and thermogravimetr…
A gênese de horizontes coesos em solos tem explicações não consistentes e, em muitos casos, contraditórias. Objetivou-se avaliar, em solos dos tabuleiros costeiros, os possíveis mecanismos físicos, químicos e mineralógicos que ocasionam o endurecimento em horizonte coeso, fragipã e duripã. Para isso, coletaram-se amos…
The development of thermoplastic elastomer blends from waste tire powder and two polyolefins, Viz. maleic anhydride grafted polypropylene and LDPE, was studied. The polymer blends were processed using a twin-screw extruder equipped with a well-designed screw configuration. The blends studied contained a dispersed phas…
Abstract Magnetic nanocomposites containing polyaniline (PANI)‐coated La‐substituted LiNi ferrite (LiNi 0.5 La 0.02 Fe 1.98 O 4 ) were synthesized by in situ polymerization in aqueous solution of hydrochloric acid. The nanocomposites exhibited the magnetic hysteresis nature under applied magnetic field. The saturation…
Abstract Bending rotation fatigue experiments are a standard evaluation procedure for pseudo-elastic NiTi wires used in the medical device industry. However, the non-linear mechanical behavior and the possible occurrence of localized deformation during bending complicate the physical interpretation of fatigue life dat…
Diatoms composing benthic microbial mats in Skarvsnes lakes, East Antarctica, were studied in terms of their taxonomy and relationship to environmental factors. Samples were collected from 13 freshwater lakes in the area. Amphora sp. (cf. veneta) was dominant in 11 of the 13 samples, while Craticula sp. (cf. molesta)…
In this review article we summarize the progress in research on multishell semiconductor nanocrystals. Three branches are covered: Core–shell–shell (CSS) nanocrystals with a lattice adapting layer which show extraordinarily high emission quantum yields and high photostability, quantum dot quantum well nanocrystals whi…
Temperature dependences of a magnetic and an orbital Bragg reflection at the Mn L 2,3 edges of La 0.5 Sr 1.5 MnO 4 have been collected. The temperature evolution of the orbital reflection depends strongly on the X-ray energy and reflects the different order parameters, which are assigned to orbitals and Jahn-Teller di…
The thermal decomposition in argon of the monohydrated ammonium tris(oxalate)niobate, (NH4)3NbO(C2O4)3.H 2O, has been studied by TG/DTG, DTA, DSC, IR absorption and XRD. The material decomposes stepwise by the release of CO, CO2, NH3 and water. The atomic structure of the complex initially becomes amorphous and then c…
Sputtering erosion/redeposition is analyzed for IAEA [Report GA10FDR1-01-07-13 (2001)] plasma facing components, with scrape-off layer (SOL) plasma convective radial transport and nonconvective (diffusion-only) transport. The analysis uses the UEDGE code [T .D. Rognlien et al., J. Nucl. Mater. 196, 347 (1992)] and DEG…
Abstract Dithienylethene derivatives, which undergo thermally irreversible photochromic reactions, were applied to sensitive color dosimeters. Upon γ-irradiation, polystyrene films containing diarylethene derivatives, such as 1,2-bis(2-methyl-5-phenyl-3-thienyl)perfluorocyclopentene (1) or 1,2-bis(5-methyl-2-phenyl-4-…
Abstract Hexagonal platy particles of CoII and AlIII layered double hydroxide were precipitated from homogeneous solutions via urea hydrolysis under hydrothermal conditions. The particle sizes and size distribution were successfully controlled by adding alcohols to the starting mixture.
Abstract In the present study, a series of Ir‐based catalysts, supported on Al 2 O 3 , ZrO 2 , CeO 2 , and Ce x Zr 1‐x O 2 , are investigated for the production of hydrogen by the high temperature steam reforming of methanol (SRM). Results show that CeO 2 and Ce x Zr 1‐x O 2 can promote the CO water gas shift (WGS) re…
Several advantages of the near-infrared (NIR) technique in the characterization of the secondary structure of regenerated Bombyx mori silk fibroin are demonstrated. Silk fibroin films with thicknesses ranging from 50 to 300 microm are suitable for the NIR measurement. The bands due to hydrogen-bonded water are indepen…