Materials Literature
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The microstructure and cracking characteristics of MIG welded magnesium alloy (AZ91D) joint, and the effect of welding speed on cracking susceptibility have been investigated. The welded joint consists of primary α-Mg and divorced phases (eutectic α-Mg+eutectic β-Mg17Al12), the latter mainly distributing along the α-M…
A procedure was developed for the modification of the manganese-oxide catalyst hopcalite GFG allowing the new quality, water resistance of granules, to be reached. This procedure can be used for the reactivation of the exhausted catalytic contact.
Multi-responsive amphiphilic gold nanoparticles (AuNPs) protected by graft poly(ether amine) have been prepared simply by a one-pot photochemical synthesis in the presence of thio-graft poly(ether amine) (gPEA-SH) and the mechanism was studied in detail.
Replacing the commonly used indium tin oxide (ITO) with a thin metal layer as a quasi-transparent electrode leads to enhancement and acceleration of the electrochromic response of WO(3), as otherwise there is an electronic activation barrier at the interface between WO(3) and the ITO electrode, impeding fast electron…
Polímeros sintéticos são largamente utilizados em diversos produtos devido às suas propriedades físicas, químicas e facilidade de transformação. O poli(cloreto de vinila), conhecido como PVC, é um dos polímeros mais versáteis desenvolvidos pelo homem, de grande utilidade para a sociedade moderna. Suas aplicações inclu…
INDIVIDUAL ANIONIC ADSORPTION AND DESORPTION BY PEDOGENIC GIBBSITE. Anion adsorption/desorption dynamics was studied as individual processes on surface of particles of a gibbsitic clay. The data suggest a remarkable gibbsite role as nitrate leaching retardant in soil. The opposite behavior of gibbsite towards adsorpti…
The stoichiometric reaction of [Rh(COD)Cl](2) with the anion resulting from the deprotonation of dppm(BH(3))(2) yielded a new alkyl Rh(I) complex; the coordination modes of the BH(3) groups are discussed on the basis of X-ray data, variable temperature multinuclear NMR experiments and DFT studies.
Abstract This mini-review focuses on the recently discovered nanomeshes and nanotemplates made from carbon, boron nitride and their mixtures with a thickness of just a single atomic layer. Typically they exist on some transition metal or semiconductor substrate, the interaction with it playing a crucial role in nanopa…
Highly ordered transparent composite films of CdS and layered double hydroxides (LDHs) have been fabricated using a template synthesis method; the size of the CdS particles in the LDH host can be controlled by adjusting the length of time of the reaction with H(2)S.
Two azine molecules, [3-{4-(dimethylamino)phenyl}prop-2-en-1-ylidene]hydrazone (HL) and [4-(dimethylamino)benzylidene]hydrazone (LL) synthesized via Schiff base condensation, show an absorption band due to intra-ligand charge transfer (ILCT). Both ligands show weak emission in the absence of a metal ion as input. When…
Phase-field method has recently been extended and utilized across many fields of materials science. Since this method can systematically incorporate, the effect of coherency strain induced by lattice mismatch and applied stress as well as external electrical and magnetic fields, it has been applied to many material pr…
Nanostructured films consisting of single Si nanoparticles (NPs) and Er3+ ions layers separated by nanometer-scale Al2O3 layers of controlled thickness have been prepared in order to tune the energy transfer between Si NPs and Er3+ ions. The amorphous Si NPs with an effective diameter of ∼4.5 nm are formed during grow…
The material characteristics of textiles used in elite sports garments have been shown to exhibit a significant influence on both the sporting performance, as well as their aesthetics, particularly in those sports where aerodynamic resistance and its associated energy expenditure impact on winning times. The present s…
We report on spectroscopic study of pyrolytichBN (pBN) by means of time- and energy-resolved pho-toluminescence methods. A high purity pBN samples(though low crystallinity) allow complementary informa-tion about excited states involved into the luminescenceprocess. We affirm our recent conclusions about theimpurity-re…
A great deal of careful experimentation has been carried out over the past 40 years on the critical mechanisms of oxidation in the zirconium alloys used for fuel cladding. However, there is still no consensus on how the nano-scale structure and chemistry of the metal/scale interface control the oxidation kinetics, alt…
It is important to quantify the cavitation energy in all applications ranging from ultrasonic cleaners to cell disruptors. A cavitation meter measures the energy intensity and frequency within ultrasonic and megasonic cleaners, including probes with side-mounted sensors that can be placed within the megasonic jet stre…
Three kinds of photoreactive polyelectrolytes of polyallylamine (PAAm), poly(acrylic acid) (PAAc), and poly(vinyl alcohol) (PVA) were synthesized by the introduction of azidophenyl groups in the respective polymers. The photoreactive PAAm, PAAc, and PVA were micropatterned on polystyrene surfaces by photolithography.…
Investigations in liquid sorption and transport were performed with three different variants of terry woven structures. Terry fabrics were produced using linen warp pile yarns and cotton or linen ground warps and wefts. The process of liquid sorption from the first moment when the water drop beads up the fabric surfac…
We investigate the impact of porosity on the reliability of low-k dielectrics. We show that electric field enhancement around pores occurs and is significantly increased by Cu interaction, suggesting a new potential mechanism for breakdown of dielectrics at stress conditions. We develop of an analytic model to predict…
A reactive and purely inorganic high Mw perfect ladder polyhydrosilsesquioxane (H-LPSQ) was first prepared under the direction of two imperative supramolecular architectures: ladder superstructure (H-LS) and donor-acceptor complex (DAC).