Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
The dimer potassium dioxo(citrato)vanadate(IV)-6-water, K(4){VO[O(2)CCH(2)C(O)(CO(2))CH(2)CO(2)]}(2).6H(2)O, was prepared by the reaction of citric acid and metavanadate in a neutral solution. The complex crystallizes in the space group P&onemacr; with unit cell parameters a = 8.474(5) Å, b = 8.902(7) Å, c = 9.596(9)…
A new one-step method, entitled fluidized-bed metal-organic chemical vapor deposition (FBMOCVD) of preparing highly dispersed metal-supported catalysts is reported. The following complexes were studied and used as CVD precursors in presence of H2: [Rh(μ-Cl)(CO)2]2, Rh(allyl)3, Rh(acac)(CO)2, Pd(allyl)(hfac), Pd(allyl)…
ABSTRACT The subject of stickiness is reviewed briefly in this paper, together with the factors influencing perceived stickiness in different contexts. A clear understanding of the difference between adhesive and cohesive failure mechanisms, and the factors influencing them, is a key requirement in developing successf…
The design, synthesis, and spectroscopic and chemical properties of four members of a new class of heterobifunctional photocleavable (caged) cross-linking reagents were described. One of the two reactive groups of the cross-linker reacted with amino groups to form the corresponding photolabile carbamates. Amino group…
The effect of UV curing intensity and curing time on the electro-optic behaviour and network morphology of reverse mode polymer stabilized cholesteric textures (PSCTs) has been studied. Scanning electron micrographs indicate that increasing the curing intensity generally results in a more open polymer network characte…
ABSTRACT The effects of temperature, relative humidity (%RH) and permeant concentration on aroma permeability were investigated in edible whey protein isolate (WPI) films. An orthogonal regression was performed to ascertain significance of these factors. Temperature and %RH had exponential effects on d‐limonene permea…
The Curie temperatures of lead zirconate titanate‐based (PZT‐based) composites that were incorporated with silver particles were evaluated as a function of the silver content. Although the substitution of the silver ion has been considered to decrease the Curie temperature, PZT/silver composites exhibited higher Curie…
The Brazilian National Synchrotron Light Laboratory (LNLS) has a dedicated protein crystallography beamline. The optical elements of the beamline include an elastically bent cylindrical mirror and a triangular bent-crystal monochromator, which focus synchrotron radiation at the position of the sample in the vertical a…
Monte Carlo and molecular dynamics simulations were performed to elucidate interlayer structure in hydrated Li−smectites (hectorite, beidellite, or montmorillonite with interlayer Li + ) at low water content (H 2 O/Li = 3). Previous spectroscopic studies of these stable clay mineral hydrates have led to interlayer str…
The dielectric property comparison between laser-ablated Mn-doped and undoped Ba0.6Sr0.4TiO3 (BST) thin films at low frequency (100 kHz) and at microwave frequencies has been demonstrated. The dielectric properties were characterized at low frequency using interdigital capacitors, and at microwave frequencies with cop…
Two-dimensional molecular clusters of a few tens nanometer size were found in spread monolayers of a series of partially fluorinated long-chain acids. Atomic force microscopy images have revealed that the size of the clusters is sharply monodisperse. The size changes systematically with changing structure of the hydro…
An analysis of transverse cracks induced in brittle coatings on soft substrates by spherical indenters is developed. The transverse cracks are essentially axisymmetric and geometrically conelike, with variant forms dependent on the location of initiation: outer cracks that initiate at the top surface outside the conta…
Neutron reflectivity measurements on polystyrene thin films (6.5–79.0 nm thick) supported on silicon substrates indicate that the mass density is near the bulk value regardless of film thickness. To account for possible inaccuracies arising from sample misalignment, reflectivity measurements were made both from the fr…
Spatially resolved electron energy-loss spectroscopy (EELS) is rapidly developing into a unique and powerful tool to characterize internal interfaces. Because atomic column resolved Z-contrast imaging can be performed simultaneously with EELS in the scanning transmission electron microscope, this combination allows th…
We have studied a composite system formed by a nematic thermotropic liquid crystal in which small silica particles have been dispersed. The colloids are aggregated and exert a randomizing effect on the nematic structure. The distorted pattern of the optical axis gives rise to a strong optical turbidity \ensuremath{\ta…
The macroscopic fracture response of real materials originates from the competition and interplay of several atomic‐scale mechanisms of decohesion and shear, such as inter‐planar cleavage and dislocation nucleation and motion. These phenomena involve processes over a wide range of length scales, from the atomic to the…
Many pharmaceutical compounds of interest form hydrates. The phase behavior of different particle size fractions of trehalose dihydrate was studied as the sugar was dehydrated by heating. Hot-stage microscopy, X-ray powder diffraction, thermogravimetric analysis, and differential scanning calorimetry were used to char…
An anomalous increase of electric conduction with decreasing temperature was found in the current through ${\mathrm{Pb}(\mathrm{T}\mathrm{i},\mathrm{Z}\mathrm{r})\mathrm{O}}_{3}$ ${\mathrm{f}\mathrm{e}\mathrm{r}\mathrm{r}\mathrm{o}\mathrm{e}\mathrm{l}\mathrm{e}\mathrm{c}\mathrm{t}\mathrm{r}\mathrm{i}\mathrm{c}/\mathrm…
The radio-frequency plasma polymerization technique was used to polymerize aniline onto polymer substrates including perfluorinated ethylene propylene copolymer. The plasma-polyaniline films were characterized by ultraviolet/visible absorption spectroscopy, Fourier transform infrared spectroscopy, electron spin resona…
Faster workstations with larger memories are making error estimation from full-matrix least-squares refinement a more practicable technique in protein crystallography. Using minimum variance weighting, estimated standard deviations of atomic positions have been calculated for two eye lens proteins from the inverse of…