Materials Literature
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The luminescent properties of 1 mol % Eu 3+ -doped cubic Lu 2 O 3 nanocrystals prepared by a combustion synthesis route were investigated. The visible emission spectrum of the europium doped Lu 2 O 3 nanocrystals indicate that the structural environment surrounding the dopant Eu 3+ ion is distorted when compared to a…
Abstract Summary: The use of lignocellulosic fibers, pineapple leaf fiber (PALF) and sisal as reinforcements in thermoplastic and thermosetting resins for developing low cost and lightweight composites is an emerging field of research in polymer science and technology. Although, these biofibers have several advantages…
We review progress in applying molecular genetic and genomic technologies to studies in the domesticated silkworm, Bombyx mori, highlighting its use as a model for Lepidoptera, and in sericulture and biotechnology. Dense molecular linkage maps are being integrated with classical linkage maps for positional cloning and…
Stirring stuff: The morphological evolution of polyaniline from nanofibers to agglomerates during its chemical polymerization shows that the key to producing pure nanofibers is to suppress secondary growth after formation of the nanofibers. A simple and effective method for the synthesis of nanofibers was thus develop…
Reducing size helps to oxidize: Unsupported gold particles behave as an efficient catalyst for the aerobic oxidation of glucose, showing a similar activity to enzymatic systems. The catalytic activity is inversely proportional to the particle diameter (d, see graph). With carbon-supported gold, no gold–support interac…
Made to order: The synthesis of well-defined porous carbon films involves four steps: 1) monomer–block copolymer film casting, 2) structure refining through solvent annealing, 3) polymerization of the carbon precursor, and 4) carbonization. The resulting films, such as that depicted, have potential as separation membr…
Nanocrystalline powder of SiO2, synthesized by gas phase condensation, has been characterized by X-ray and electron diffractometric techniques. The composition of the as-received powder is mostly amorphous and a minor amount of alpha-crystobalite phase. Annealing at higher temperatures, the amorphous phase gradually t…
Stainless steels have sustained a continuous growth for these 50 years, based on their outstanding corrosion resistance properties. Their corrosion performance has been ever improved for a large range of environments. New grades with higher static or dynamic mechanical properties afford high quality parts at lower cos…
The designers of catalytic converters have found that the use of cerium oxide in the washcoat formulation, to store and release oxygen, gives higher conversion efficiencies in three-way catalysts. It has also been shown that oscillating the air-fuel ratio around λ = 1, which effectively oscillates the oxygen concentra…
A review of experimental studies of magnon excitations in manganites is presented. Two kinds of techniques: the inelastic neutron scattering (in bulk materials) and the microwave resonance (in thin films) are considered. Experimental studies of spin dynamics by inelastic neutron scattering in metallic ferromagnetic ma…
Our present work investigates the structural properties of bulk NiMnSb prepared by growth from the melt, using various thermal regimes. We studied the compositional behaviour of the polycrystalline material obtained from stoichiometric 1:1:1 and respectively off-stoichiometric melts. The latter samples were grown with…
The EPR of Mn ions in the (La1−y Pry)0.7Ca0.3MnO3 system has been studied within a broad range of temperatures (4<T<600 K) and Pr concentrations (0≤y≤1), as well as under isotope substitution of 18O for 16O. All compositions were shown to undergo transitions to a magnetically ordered state with decreasing temperature.…
Abstract The mechanical and thermal behaviour and the morphology of High‐Density Polyethylene (HDPE), filled with different types of Barium Sulfate (BaSO 4 ) submicron particles have been examined. Composites with a filler content in the range 5‐15 vol% were obtained with a twin screw mixer‐single screw extruder and t…
Polyurethane (PU) foam is molded into preheated tools and expands to fill the mold cavity. Foam parts frequently have defects such as varying density and flaws in surface texture. Although there are many possible causes uneven mold temperatures are suspected to be a leading cause of defects (1,2) . Much of the work pr…
The temperature dependence of the absorption spectra of 2,2'-bithiophene and 2,2':5',2''-terthiophene isolated molecules in cyclodextrin (CyD) were investigated between 15 K to room temperature (RT). The optical absorption spectra of BT molecules in β- and γ-CyD, (BT) β-CyD and (BT) γ-CyD are nearly the same between 1…
A publication of the French Society of Microscopies, Large-Angle Convergent-Beam Electron Diffraction Applications to Crystal Defects is devoted to an important aspect of electron diffraction. Convergent-beam diffraction is capable of furnishing remarkably accurate crystallographic information. In this book, the autho…
Using the band-structure method, we have studied the coupling between the magnetic ion $d$ states and the itinerant valence and conduction states in ${\mathrm{Be}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}\mathrm{Te}$, ${\mathrm{Zn}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}\mathrm{Se}$, ${\mathrm{Zn}}_{1\ensuremath{-}x}{\mathrm{…
We have reported that poly(2-methoxyethyl acrylate) (PMEA) shows excellent blood compatibility with respect to the coagulation, complement, leukocyte and platelet systems in vitro and ex vivo when compared with other polymer surfaces. In this study, to clarify the reasons for this good compatibility, the structure of…
The kinetics of flocculation and removal of Microcystis aeruginosa by chitosan-modified clays was studied. The efficiency of flocculating and removing of algal cells was greatly improved after the modification of the clays. About 80% of algae cell was removed in 0.5 hour, and 90% in 2 hours, when 11 mg/L modified sepi…
A technique is developed for measuring the modulus of elasticity of a material with a Nanoscan scanning force microscope on the basis of measuring the dependence of probe vibration frequency on the penetration depth of the needle into the specimen. This technique makes it possible to study materials with elastic modul…