Materials Literature
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A systematic study on the synthesis of the Ru-1212 compound by preparing a series of samples that were annealed at increasing temperatures and then quenched has been performed. It results that the optimal temperature for the annealing lies around 1060-1065 C; a further temperature increase worsens the phase formation.…
Critical neutron scattering measurements have been performed on CsCo$_{0.83}$Mg$_{0.17}$Br$_3$, a dilute stacked triangular lattice (STL) Ising antiferromagnet (AF). A two component lineshape associated with the critical fluctuations appears at a temperature coincident with T$_{N1}$ observed in pure CsCoBr$_3$. Such s…
Upon loading of aqueous hydrogen peroxide into Ti silicalite sieve and removal of the solvent by evacuation, a thermally stable hydroperoxo species was detected by infrared spectroscopy with an OO stretch absorption at 837 cm(-1) ((18)O, 793 cm(-1)) and a broad OH band at 3400 cm(-1). The species, assigned to TiOOH (e…
Density functional theory and complete active space self-consistent field computations are applied to elucidate the singlet diradical character of square planar, diamagnetic nickel complexes that contain two bidentate ligands derived from o-catecholates, o-phenylenediamines, o-benzodithiolates, o-aminophenolates, and…
We have performed ab initio electronic structure and total-energy calculations for bcc, fcc, and hcp Al structures to study the equations of state, volume dependences of elastic constants, and relative stability diagram for these structures. A technique for elastic constant calculation in the case of initial isotropic…
The crystal and molecular structure, together with the hydrogen-bonding system in cellulose I(alpha), has been determined using atomic-resolution synchrotron and neutron diffraction data recorded from oriented fibrous samples prepared by aligning cellulose microcrystals from the cell wall of the freshwater alga Glauco…
<div class="htmlview paragraph">Gas carburizing is a surface hardening method that is used for automobile steel parts such as gears. The conventional gas carburizing(at 1223K) takes longer time. Shortening the carburizing time will contribute greatly to the energy saving and CO<sub>2</sub> reduction…
<div class="htmlview paragraph">Polypropylene is widely used for car bumpers, since some of its limitations have been overcome by means of innovative processing. Cold plasma treatment represents an efficient, clean and economic alternative to activate polymeric surfaces. The present work deals with air cold plas…
Thermally activated shape memory materials have been employed as actuators fora number of years. They are generally activated by electrical resistance heaters, or sometimes by direct electrical resistance. Thermoelectric modules can also provide activation energy, and they provide several unique advantages over the mo…
A Comment on the Letter by M. Verissimo-Alves et al., Phys. Rev. Lett. 86, 3372 (2001). The authors of the Letter offer a Reply.Received 19 November 2001DOI:https://doi.org/10.1103/PhysRevLett.89.049701©2002 American Physical Society
<div class="htmlview paragraph">This work reports on the results of tensile testing of Dual-Phase steels at different strain rates in the range 0.0001/s-1000/s. This type of steel is a strong candidate for use in crash-absorbing automotive components. An understanding of material behaviour at relevant strain rat…
The speciation and equilibria of sodium dodecatungstosilicate has been determined using 183W nuclear magnetic resonance (NMR) spectroscopy over the pH range 3-13.5. The use of NMR allowed the direct observation of polytungstate anions in aqueous solution and at high concentration (0.5 mol L-1). Using this technique, t…
Hyper-branched polymers (HBP) can be prepared in one-pot poly- reactions from ABx monomers. These polymers exhibit specific properties due to their globular, highly functional structure and are of significant interest due to their main potential applications in blends, coatings or resins, or as additives to linear pol…
Both high-frequency acoustic modes and the boson peak related to ${\mathrm{SiO}}_{4}$ librations are observed in a single inelastic x-ray scattering experiment. The experimental data are consistent with a picture where the acoustic modes experience a crossover at a frequency ${\ensuremath{\Omega}}_{\mathrm{co}}$ beyon…
In this study the fusion method was used to synthesize PbS nanocrystal quantum dots (QDs) embedded in S-doped glass matrix (SiO 2 −Na 2 CO 3 −ZnO−Al 2 O 3 −PbO 2 −B 2 O 3 ). Optical absorption, atomic force microscopy (AFM), and photoluminescence (PL) were used to investigate different samples. Experimental data indic…
<div class="htmlview paragraph">To increase crash performance in automotive vehicles it is necessary to use new techniques and materials. Components linked to crash safety should transmit or absorb energy. The energy absorbing capability of a specific component is a combination of geometry and material propertie…
The methods presented allow vacuum-tight microstructured components to be produced, in which the microchannel walls are provided with aluminum oxide coatings. These coatings have a large surface area and may be applied as catalyst carriers for heterogeneously catalyzed reactions, as was demonstrated by the catalytic c…
The buildup and structure of multilayer films containing cationic polyelectrolyte and silica nanoparticles have been studied by means of ellipsometry, atomic force microscopy, and X-ray photoelectron spectroscopy. Emphasis was placed on the effect of ionic strength on the adsorption behavior and structure formation. C…
The chemisorption of molecules on metal oxide surfaces is generally considered to occur by either an acid/base or a redox mechanism, with the former dominating on nonreducible and insulating oxides such as MgO. NO, NO 2, and the less familiar NO 3 are atypical adsorbates in that their most potent Lewis acidic and basi…
Abstract Acrylic/nano‐silica composite latexes were prepared by blending via high shear stirring (SS) or ball milling (BM) and in situ polymerization (IS). For comparison, composites filled with micro‐silica were also prepared. The mechanical and optical properties of the polymers formed by the composite latex filled…