Materials Literature
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, is one of the most common materialsused in the construction of commercialbuildings. Its properties make concrete anexcellent choice for structures, claddingsystems and floor slabs. On the other hand,concrete is widely used for radiation shieldingin radiotherapy facilities and nuclear reactors,and for the prevention…
Trituration and crystallization are essential techniques for purification of intermediates and drug substances in pharmaceutical process development. Traditionally, identifying the optimal solvent conditions for impurity rejection adopts an empirical approach that can be a time and material consuming process. On the b…
The lowest energy structures of bare Gen(z) clusters (n = 10, 12; z = -6, 0, +2, +4) obtained using density functional theory (DFT) at the hybrid B3LYP level often are relatively low-symmetry polyhedra not readily recognizable by the Wade-Mingos rules. However, such optimized structures may arise from higher symmetry…
Doubly activated alkaline-earth phosphors are known to present luminescent and charge-storage properties. In this work, we investigate the photoluminescence (PL) and the optically stimulated luminescence (OSL) of the SrS:Ce,Sm phosphor by means of time-resolved spectroscopy with excitation laser pulses of 2ps duration…
We report on the photocurrent properties of the hydrogenated nanocrystalline silicon (nc-Si:H) thin film/crystalline silicon (c-Si) n-p heterostructure. By comparison with the c-Si n-p homojunction, two Gaussian-type photocurrent peaks are observed in the nc-Si:H/c-Si heterostructure and attributed to be transitions f…
The Flory−Huggins interaction parameter, χ, for a series of critical binary blends of polyisobutylene and deuterated polybutadiene was measured by small-angle neutron scattering. χ was determined by fitting the scattering intensity profiles single-phase blends to the well-established random-phase approximation. Our ex…
The bonding properties of cations in phosphate glasses determine many short- and medium-range structural features in the glass network, hence influencing bulk properties. In this work, Pb-Al-metaphosphate glasses (1 - x)Pb(PO(3))(2).xAI(PO(3))(3) with 0 < or = x < or = 1 were analyzed to determine the effect of the su…
A simple three-dimensional void growth model is presented that can be used to simulate the resistance behavior in narrow copper lines upon thermo-electrical stressing. The output of the model is compared with experimental results obtained from electromigration tests carried out on single damascene copper lines encapsu…
Lanthanum-doped bismuth layer-structured ferroelectric ceramics SrBi5−xLaxTi4FeO18 (x=0,0.2) were prepared by the solid-state reaction method. X-ray diffraction patterns indicate that single phases were formed. Hysteresis loops at room temperature (20 °C) show that the La-doped ceramic presents a slightly lower sponta…
The optical properties of TlGaSeS layered single crystals have been investigated by measuring the transmissions and the reflections in the wavelength region between 400 and 1100 nm. The optical indirect transitions with a band gap energy of 2.27 eV and direct transitions with a band gap energy of 2.58 eV were found by…
The crystalline orientation in nylon-6 and the crystalline and clay layer orientation in nylon-6/clay nanocomposites produced by 90° equal channel angular extrusion (ECAE) are reported. A temperature of ca. 150 °C was necessary to obtain the highest permanent shear strain for both nylon-6 and nylon-6/clay nanocomposit…
Between August and October of 2003, a total of 397 samples of epilithic diatoms were collected from different stations belonging to the control network of the North Hydrographical Confederation of Spain (CHN). One hundred and seventeen sites with Eunotia diatom species were found. Galicia, with 78 localities, was the…
Abstract We have successfully deposited nanoporous silica layers on titania nanoparticles, commercial P25 (Degussa), by the reaction of P25 with aqueous mixture of TEOS (silica source) and CTA (porogen) and the subsequent calcination. The thickness of nanoporous silica layer was controlled by changing the added amount…
Heterolayered Pb(Zr1−xTix)O3 thin films consisting of different numbers of alternating Pb(Zr0.7Ti0.3)O3 and Pb(Zr0.3Ti0.7)O3 layers are studied. They exhibit (001)∕(100) preferred orientation and dense microstructure when baked at 500°C and then thermally annealed at 650°C. They demonstrate a considerably low leakage…
When reacted with trioctylphosphine at approximately 360 degrees C, rhodium nanocrystals convert to rhodium phosphide Rh(2)P nanocrystals. Careful control over synthetic variables, such as temperature, stabilizing ligands, and cosolvents, can result in Rh(2)P nanocrystals with shapes that reflect the Rh nanocrystal te…
Mixed-arm star polymers were synthesized by atom transfer radical polymerization (ATRP) and reverse addition−fragmentation chain transfer (RAFT) sequential polymerization using the “core first” method. The synthesis consisted of three steps: (i) synthesis of a hyperbranched polyglycerol (HPG) core, (ii) ATRP with the…
A model of an allophane nanoball is proposed. The model structure is characterized by a Si/Al ratio of 0.49, has external and internal diameters of 50 and 40 Å, respectively, and contains six holes of about 7 Å size connecting the internal void of the nanoball with external space. The calculated XRD pattern and Raman…
A dithia analogue of meso -alkylidenyl sapphyrin, a class of compounds that was hitherto unknown, was prepared via the condensation of a 1,3-phenylenebispyrrole with a bithiophene diol. The resulting system was found to be stable and highly nonplanar. It was also characterized by a partially conjugated electronic stru…
The electronic structure and density of states of SnO2, CuAlO2, and CuInO2 have been calculated using the plane wave pseudopotential method, in order to study the limits to doping in n, p, and bipolar semiconductor systems. For each material, we have calculated the charge neutrality level and we have related it to the…
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