Materials Literature
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Abstract The thermal decomposition of hydrotalcite (HT), with chemical composition Mg 1- x Al x (OH) 2 (CO 3 ) x /2 .(1-3 x /2)H 2 O, (0.20 < x ≤ 0.33), is a complex sequence of dehydration, dehydroxylation and decarbonization and leads to the formation of a series of metaphases: HT-D (dehydrated HT), HT-B (partial…
In this paper we describe the lithographic behavior and related material properties of a new class of chemically amplified, positive tone, silicon-containing methacrylate photoresists incorporating the polyhedral oligomeric silsesquioxane (POSS) group as the etch-resistant component. POSS-bearing monomers were copolym…
Submicrometer TiC/SiC composites were fabricated by a rapid reactive sintering process through spark plasma sintering (SPS) technique using the carbon, titanium, and nanosized‐SiC powders without any additive. It was found that the composite could be sintered in a relatively short time (8 min at 1480°C) to 97.9% of th…
Ti3SiC2 combines many of the merits of both metals and ceramics and has potential in diverse high temperature applications. However, TiC always exists as an impurity phase, which is deleterious to the high-temperature oxidation resistance of Ti3SiC2. Although many attempts have been made, it is difficult to eliminate…
Abstract Two soil sequences in northern Italy (Val di Fiemme and Val Genova) along an elevational gradient ranging from moderate (950 m a.s.l.) to high alpine (2440 m a.s.l.) climate zones were investigated with respect to element losses (Ca, Mg, K, Na, Fe, Al, Si, Mn) and development of clay minerals. Soils formed on…
Abstract Summary: Star‐shaped hydroxy‐terminated poly( ε ‐caprolactone)s ( ss PCL), with arms of different lengths, were obtained by ring‐opening polymerization (ROP) of ε ‐caprolactone initiated by pentaerythritol, and were condensed with α ‐methyl‐ ω ‐(3‐carboxypropionyloxy)‐poly(ethylene oxide)s ( $\overline M _{\r…
A highly sensitive fiber-optic sensor based on optical beam deflection is applied for investigating the propagation of a laser-induced plasma shock wave, the oscillation of a cavitation bubble diameter, and the development of a bubble-collapse-induced shock wave when a Nd:YAG laser pulse is focused upon an aluminum su…
We have found strong visible photoluminescence (PL) from 0.4 nm carbon nanotubes embedded in the ordered channels of a zeolite crystal matrix. The PL exhibits a broad emission band with an efficiency of $\ensuremath{\sim}1%--5%$. Strong polarization dependence is observed both on the excitation and emission, indicatin…
A cauliflower structure is a granular film composed of spherical particles similar in size, each with numerous nanoscale nodules on its surface. The structure is produced during certain chemical vapour deposition (CVD) processes for diamond and silicon thin film growth. A classical account in terms of atomic unit depo…
The finite-element method is used to solve Poisson's equation, under equilibrium conditions, for coaxial carbon nanotube field-effect transistors in which the gate electrode does not entirely cover the nanotube channel between the source- and drain-end contacts. A conformal transformation is applied to overcome the pr…
A lengthy search in conducting hybrids: Molecular metals containing bulky and highly charged polyoxometalates can be prepared. The synthetic strategy is based on the combination of the bis(ethylenedioxo)tetrathiafulvalene (BEDO-TTF) donor (see picture; ball-and-stick representation) with inorganic layers made of Keggi…
Aligning the layers: Immersing an Au(111) substrate successively into solutions of zinc(II) octaethylporphyrin and an open-cage C60 derivative in benzene results in the latter species exhibiting a well-defined electrochemical response as a consequence of the formation of a 1:1 supramolecular assembly (see picture). ST…
Medin is the main constituent of aortic medial amyloid that occurs in virtually all individuals older than sixty. It is derived from a proteolytic fragment of lactadherin, a mammary epithelial cell expressed glyco-protein that is secreted as part of the milk fat globule membrane. It was previously demonstrated that an…
A positive colossal magnetoresistance (CMR) has been discovered in an epitaxial multilayer p–n heterostructure fabricated with Sr-doped LaMnO3 and Nb-doped SrTiO3 by laser molecular-beam epitaxy. In contrast to the negative CMR of the LaMnO3 compound family, positive CMR is observed in the temperature range from 100 t…
Molecular dynamics (MD) simulations with an embedded atom method (EAM) potential are carried out to analyse the size and strain rate effects in the tensile deformation of single-crystal copper nanowires. The cross-sections of the wires are squares with dimensions of between 5 and 20 lattice constants (or 1.8-7.2nm). D…
Organic clusters with uniform structure and size have been synthesized and studied. The quantum confinements on organic arms [chains shorter than exciton Bohr radii (aB)] have been confirmed by the discrete energy levels from PLE, narrow PL lines, size effect from UV, and spherical shape from TEM, as well as Raman pea…
Under 172 nm light excitation, energy transfer from Pr 3+ , Nd 3+ , Tb 3+ or Tm 3+ to Gd 3+ resulting in strong Gd 3+ emission at 312 nm was observed in GdPO 4 doped with one of these ions. Among them, Pr 3+ provides the strongest Gd 3+ emission and Tm 3+ is the second best. A wide energy gap between the 5d state and…
Safety linings of steel ladles are made of high content alumina castable. In situ observations confirm that during drying a network of macrocracks appears in the monolithic castable lining, owing to both dehydration of the cement paste and temperature. Crack formation kinetics have been characterised over the life of…
(2004). Factors affecting flash weldability in high strength steel – a study on toughness improvement of flash welded joints in high strength steel. Welding International: Vol. 18, No. 6, pp. 436-443.
An adequate ductile fracture locus has to be developed to reasonably model crack initiation and propagation in high velocity impact. Most of the fracture loci in the literature were proposed on the basis of tensile tests while in high velocity impact cracks usually occur in the region where shear and compression are d…