Materials Literature
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The self-wetting properties of ionic crystal surfaces are studied, using NaCl(100) as a prototype case. The anomalously large contact angle measured long ago by Mutaftschiev is well reproduced by realistic molecular dynamics simulations. Based on these results, and on independent determinations of the liquid-vapor and…
We report the observation of coherent polarization coupling between the exciton of a molecular J-aggregate and the electronic polarization of noble metal nanoparticles. For Ag nanoparticles, coherent exciton coupling to the conduction band electrons leads to constructive interference and a long-lived exciton. For Au n…
The relationship between perturbations to contact angles on a rough or textured surface and the super-hydrophobic enhancement of the equilibrium contact angle is discussed theoretically. Two models are considered. In the first (Wenzel) case, the super-hydrophobic surface has a very high contact angle and the droplet c…
The mechanisms involved in the crystallization of polymer molecules, in the form of folded chain crystals [1] called lamellae, are now well understood [24]. The lamellar organization of polymers, crystallized both from solution and from the melt, is generally observed when the polymer chains are flexible and linear eno…
We have studied the rheological property evolution and hydration behavior of white and ordinary portland cement (type I) pastes and concentrated cement–polyelectrolyte suspensions. Cement composition had a marked effect on the elastic property evolution ( G ′( t )) and hydration behavior of these suspensions in the pr…
The galvanizing reaction is retarded when phosphorus-added steel is used as a substrate. We have found that both the galvanizing and the galvannealing reactions are highly promoted when thiourea solution is coated on the cold-rolled steel surface before the annealing process. Both a plan-view and cross-sectional chara…
An adjacent sequence iteration method for designing a diffractive element with function of controlling wavefront propagation is presented, and a binary optical element for focusing a diode laser beam in a long focal depth is designed with this method, fabricated by means of photolithography and ion-etching techniques.…
Article Grain boundary self-diffusion in α-iron of different purity: effect of dislocation enhanced diffusion was published on October 1, 2004 in the journal International Journal of Materials Research (volume 95, issue 10).
Abstract The thermal behavior and kinetic parameters of the decomposition reaction of triethylene glycol dinitrate (TEGDN) in a temperature‐programmed mode at different pressures (0.1, 2, 4 and 6 MPa) have been investigated by means of DSC and TG‐DTG. The results show that the properties of the thermal decomposition o…
Emission properties and energy transfer of PbO–Bi 2 O 3 –Ga 2 O 3 –GeO 2 glasses codoped with Tm 3+ and Tb 3+ ions were investigated. The 1.48‐μm emission due to the Tm 3+ : 3 H 4 → 3 F 4 transition can be used to amplify the S‐band (1460–1530‐nm) signal light. With Tb 3+ addition, the lifetime and emission intensity…
The oxygen permeability of oxide composite membranes containing similar volume fractions of the components, including (La0.9 Sr0.1)0.98 Ga0.8 Mg0.2 O3-δ(LSGM)–La0.8 Sr0.2Fe0.8Co0.2O3-δ (LSFC), LSGM–La2Ni0.8Cu0.2O4+δ (LNC), SrCoO3-δ–Sr2Fe3O6.5 ±δ, Ce0.8Gd0.2O2-δ (CGO)–LSFC and CGO–La0.7Sr0.3MnO3-δ (LSM), was studied at…
The phase chemical composition of an Al 2 O 3 /Si interface formed upon molecular deposition of a 100-nm-thick Al 2 O 3 layer on the Si(100) ( c -Si) surface is investigated by depth-resolved ultrasoft x-ray emission spectroscopy. Analysis is performed using Al and Si L 2, 3 emission bands. It is found that the thickn…
Alumina and alumino‐silicate matrices have been used to produce nanocarbons by ethylene CVD. Bundles of aligned, opened multi wall carbon nanotubes were obtained with alumina membrane (see Figure), while with beta zeolite ultra high porosity carbon (BET surface area >2000 m 2 /g) was formed.
Three-layer magnetic film systems Fe/Si/Fe have been studied by the method of magnetic resonance. It is established that the ferromagnetic layer thickness affects the magnitude of the interlayer exchange interaction in this system. A mechanism explaining the observed effect is proposed.
The response of chain packing for four saturated hydrocarbon polymers, poly(ethylene−propylene), poly(ethylene−butene), isotactic polypropylene, and head-to-head polypropylene, to changes in environment are considered. The changes arise from mixing each material with the three others in the series. Intra- and intermol…
A new dihydrochalcone glucoside, vacciniifolin, along with confusoside, trilobatin and sieboldin were isolated from the leaves of Symplocos vacciniifolia. By the method of spectral analysis, this new compound was elucidated as 2',3,4,4'-tetrahydroxydihydrochalcone 4'-O-β-D-glucopyranoside.
Abstract Acrylic acid (AA) and its esters are monomers which can easily be polymerized. In order to avoid the unintentional polymerization during the manufacture and storage, the acrylic esters are stored under air‐atmosphere to which 15 ppm (g g –1 ) hydroquinone monomethylether (MeHQ) has been added. The consumption…
Abstract Melt mixed blends of ethylene–propylene–rubber (EPR) and polydimethylsiloxane (PDMS) were studied with regard to the composition dependence of the dynamic viscoelastic properties in relation to their morphology. Differential scanning calorimetry, scanning electron microscopy, and dynamic mechanical analysis (…
Atualmente, alguns laboratórios de análise de solo determinam Al, Ca e Mg trocáveis em extratos de KCl 1 mol L-1 e K e Na na solução extratora Mehlich-1, também usada na extração de fósforo. Outros laboratórios, que empregam a resina trocadora de ânions para P, avaliam também Ca, Mg e K no extrato, não sendo possível…
The change mechanisms of staple yarn hairiness during the winding process are studied using some previously published theories on yarn structures. Of the three kinds of yarn hairiness, the one formed by trailing and protruding fiber ends is analyzed first in terms of the interactions of the fiber ends, the tension dis…