Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
The LaCo 1− x Fe x O 3 compounds have been investigated by means of neutron powder diffraction (NPD), x-ray powder diffraction (XPD) and magnetization measurements. The NPD and XPD patterns were successfully refined as rhombohedral ( x ≤0.5) and orthorhombic ( x ≥0.6). The temperature-induced transition from the rhomb…
A method based on a generic small-signal equivalent circuit for field-effect transistors is proposed for predicting the unity-current-gain frequency f/sub T/ for carbon-nanotube devices. The key to the useful implementation of the method is the rigorous estimation of the values for the components of the equivalent cir…
In order to study the formation of ridging in ferritic stainless steel (FSS) sheets, the evolution of the crystallographic texture was investigated by macro and micro‐texture measurements throughout the thickness of the sheets. The as‐received hot band material displayed a pronounced through‐thickness texture gradient…
Abstract Exfoliated polyamide‐6 (PA6)/organically modified montmorillonite clay (OMMT) nanocomposites (PNs) were modified with partially maleinized styrene–ethylene/butadiene–styrene triblock copolymers (SEBS) at three maleinization levels in an attempt to link in these materials high toughness with appropriate small‐…
Reported are the preparation and characterization of Pd/Ni nanoparticles in the core of water-dispersible nanotubes of a triblock copolymer. The preparation involves first the preparation of the triblock nanotubes and then the production of Pd nanoparticles inside the nanotube cores. Ni is introduced in the final step…
The crystal-chemistry of 13 elbaite-schorl tourmaline crystals from the Cruzeiro pegmatite (Minas Gerais, Brazil) was studied with a multi-analytical approach (SREF, EMPA, SIMS, MS). Effective cation radii at the Y and Z sites and site populations were refined by a minimization procedure. The results indicate that the…
Ba 1 - x Sr x TiO 3 ( x = 0, 0.25, 0.5, 0.75, and 1) nanocrystalline powders were prepared by mechanosynthesis in a planetary mill, from stoichiometric mixtures of BaO 2, SrO, and TiO 2 at room temperature. Evolution during the mechanical treatment and subsequent annealings was investigated by X-ray diffraction (XRD)…
We prepared motors with experimental cores using a soft magnetic composite and an amorphous metal and evaluated their performance. We measured the magnetic and motor characteristics, such as iron loss, when the new materials were used in the stator core teeth. The amorphous metal was found to have very high permeabili…
This paper has allowed me the rare opportunity and pleasure of acknowledging those who have played important roles in my scientific career. It has also enabled me to report work in the field of liquid crystals which has gone unpublished. The particular topics have been selected because they illustrate the areas of liq…
Here we report on the application of sol−gel template synthesis to the investigation of size-induced ferroelectric phase transitions in lead titanate (PbTiO 3 ) nanotubes and nanofibers. A 0.8 M chelate sol−gel, made from titanium(IV) tertabutoxide and lead(II) trihydrate acetate, was applied to two different template…
Two possible mechanisms for the corrosion protection by conducting polymer coatings are discussed in this paper. The ennobling mechanism based on the assumption that the high potential of the polymer is able to keep the metal surface in the passive state and the possible capability to smear out the sites of oxygen red…
We measure pseudodielectric functions in the visible-deep ultraviolet spectral range of Pb(ZrxTi1−x)O3 (x=0.2,0.56,0.82) (PZT), Pb0.98Nb0.04(Zr0.2Ti0.8)0.96O3, Pb0.91La0.09(Zr0.65Ti0.35)0.98O3, and Pb0.85La0.15Ti0.96O3 films grown on platinized silicon substrates using a sol-gel method and on (0001) sapphire using a r…
Abstract Nanostructured materials with extremely fine grain sizes, typically less than 100 nm, have been shown to exhibit extremely high strength and hardness, increased diffusivity, useful sintering characteristics, and other unusual properties. Significant developments have taken place in recent years in trying to a…
Polypropylene nonwoven fabrics are treated by He atmospheric pressure glow discharge plasma. After plasma treatment, weight loss (%), surface properties (wettability, morphology, and chemical composition changes), tensile strength, low-stress mechanical properties, and air permeability of the fabrics are examined. Sca…
Part 1 Understanding the effects of processing on the properties of metals: The behaviour of metals during high-temperature processing Thermodynamic aspects of metals processing Phase diagrams, phase transformations, and the prediction of metal properties Measurement and estimation of physical properties of metals at…
Block copolymer thin films are ideal templates for a wide range of technologies where large area patterns of nanoscale features are desired. One of the main challenges in using lamellae- and cylinder-forming block copolymers for this purpose is to induce the block copolymer domains to orient perpendicular to the film…
The hot deformation of AZ31 magnesium alloy has been studied by compression testing using a Gleeble 1500 machine at temperatures between 250 and 450°C and at strain rates ranging from 0·005 to 5 s−1. Optical microscopy and transmission electron microscopy (TEM) have been used to observe microstructures of the alloy. T…
The spectroscopic characterization of zinc metaphosphate glasses, singly and doubly doped with Ce 3+ and Mn 2+ ions, is performed through excitation and emission spectra and decay time measurements. The weak yellow emission of Mn 2+ is significantly enhanced by means of an efficient energy transfer from Ce 3+ to Mn 2+…
In vitro bone marrow stromal cell (BMSC) growth may be enhanced through culture medium supplementation, mimicking the biochemical environment in which cells optimally proliferate and differentiate. We hypothesize that the sequential administration of growth factors to first proliferate and then differentiate BMSCs cul…
Individual carbon nanotubes (CNTs) often occur in randomly dispersed two-dimensional as well as three-dimensional configurations that make device fabrication difficult. Making electrical contact to such CNTs is of practical interest. To this end, we make contact to individual metallic single-walled carbon nanotubes (S…