Materials Literature
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Data on phosphates with the structure of biogenic whitlockite mineral [analog of low-temperature modification of β-Ca3(PO4)2] were analyzed. The possibility of isomorphic substitution of cations in phosphates with whitlockite structure was evaluated and formation of solid solutions of various compositions involving el…
Aerogels (AGs) are ultralow-density nanoporous solids that have numerous potential applications. However, as most AGs are strong insulators with poor mechanical properties, direct studies of the complex nanoporous structure of AGs by methods such as atomic force and conventional scanning electron microscopy (SEM) have…
Charcoal was prepared from coconut shell and activated at three temperatures 300, 350 and 400°C in constant flow of air or nitrogen. Adsorption of oxalic acid and maleic acid from their aqueous solution on charcoal was studied. Oxalic acid gave Langmuir type of adsorption isotherm indicating monolayer formation but ma…
Abstract Many soils in southern Switzerland have a black color, contain a large amount of soil organic matter (SOM) and seem to have some andic properties although they did not develop on volcanic parent material. We investigated three typical ‘black’ soils to determine the mechanisms of (clay) mineral formation and t…
Abstract The development of the new Spherizone technology, based on the innovative reactor MultiZone Circulating Reactor (MZCR), exploits its capability to generate innovative polypropylene based materials. The MZCR is made by two legs, through which solid is kept circulating: the riser, operating as a fast fluidized…
Mesoporous silica (MPS) thin films are attractive for achieving low relative dielectric permittivity (low k) interlayer isolation in integrated circuit wiring, but are susceptible to instabilities in electrical behavior due to water uptake and copper diffusion. Here, we show that capping MPS films with a trimethyl-gro…
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…