Materials Literature
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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 It has also enabled me to report work in the field of liquid crystals which has gone unpublished.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…
M -plane and A -plane ZnO films were grown on M -plane and R -plane sapphire substrates respectively. At high growth temperatures and/or VI/II ratios, ZnO grew along the direction perpendicular to the c -axis. On the other hand, at low growth temperatures and/or VI/II ratios, ZnO grew along the c -axis direction. A ve…
A two-component multiblock copolymer with undecablock two of them on both chain ends are long and nine of them are short was successfully prepared by anionic polymerization using the six-step sequential monomer addition technique. Polymer components are polystyrene (S) and polyisoprene (I), its total molecular weight…
This article presents a review of the state of the art of materials used in spintronics. It is devoted to materials exhibiting novel and exciting electronic properties: manganites, double perovskites, spinel ferrites and diluted magnetic semiconductors. We present the main features of these classes of materials as wel…
Diesel particulate filters (DPF) made from an advanced ceramic material (ACM) based on mullite have demonstrated high filtration efficiency, low‐pressure drop, high‐temperature handling capability, and excellent mechanical integrity at a porosity of 60% or higher. Due to the ability to control microstructure, total po…