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。
Thin compressive layers within a laminar ceramic arrest large cracks (surface and internal) and produce a threshold strength. This phenomenon increases the damage tolerance of ceramics and will allow engineers to design reliable ceramic components for structural applications. The stress intensity factor derived for a…
Spherical nickel hydroxide powders coprecipitated with the additives , , and were prepared through a spraying technique. These powders, which have a higher tapping density and a much smaller pore volume and crystalline size than conventional powders, were used as the active materials of nickel hydroxide electrodes. Th…
The performance of Cu cermets as anodes for the direct oxidation of in solid oxide fuel cells was examined. Mixtures of Cu and yttria‐stabilized zirconia (YSZ) were found to give similar performance to Ni‐YSZ cermets when was used as the fuel, but did not deactivate in dry . While Cu‐YSZ was essentially inert to metha…
The real structures of clinotobermorite, tobermorite 9 Å, and tobermorite 11 Å were determined through the application of OD approach, which allowed us to explain their peculiar disorder and polytypic features and to derive the main polytypes for each of them. The structural arrangements will be described and discusse…
In the area of crosslinked chemical supports, continuous media such as rigid macroporous polymer monoliths have certain advantages. Following an introduction to monolithic porous polymer materials, the various applications of macroporous polymer monoliths are reviewed. The Figure shows an SEM image of a monolith prepa…
Growing environmental concerns regarding the use of heavy metals in coating formulations have lead to a new coating strategy employing inherently conducting polymers (ICPs), such as polyaniline (PANI), as a key component. The principal potential advantage offered by the ICP coating technology is toleration of pinholes…
In this article, the first part of a two‐part study, we report the reaction path and microstructure evolution during the reactive hot isostatic pressing of Ti 3 SiC 2 , starting with titanium, SiC, and graphite powders. A series of interrupted hot isostatic press runs have been conducted as a function of temperature (…
We review some recent results in the spectroscopy of single CdSe nanocrystal quantum dots. By eliminating the effects of inhomogeneous broadening and ensemble averaging, single nanocrystal spectroscopy has revealed many new and previously unexpected physical phenomena. Among those discussed in this review are ultra-na…
Electronic structure calculations on the nature of electronic states and the magnetic coupling in Mn-acetate $[{\mathrm{Mn}}_{12}{\mathrm{O}}_{12}(R\mathrm{COO}{)}_{16}({\mathrm{H}}_{2}\mathrm{O}{)}_{4}]$ molecules have been been carried out within the generalized gradient approximation to the density functional forma…
The fundamental issues of symmetry related to chirality are discussed and applied to simple situations relevant to liquid crystals. The authors show that any chiral measure of a geometric object is a pseudoscalar (invariant under proper rotations but changing sign under improper rotations) and must involve three-point…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTMesoporous Silicate Sequestration and Release of ProteinsYong-Jin Han, Galen D. Stucky, and Alison ButlerView Author Information Department of Chemistry and Biochemistry and the Materials Research Laboratory University of California Santa Barbara, California 93106-9510…
Abstract Smectites are one of the most important groups of phyllosilicates found in soils and sediments, and certainly one of the most difficult to study. New information about the formation mechanisms, impact of structural features on surface properties, and long-term stability of smectites can best be gained from th…
We have peformed neutron diffraction measurements on melt-grown polycrystalline samples of ${\mathrm{Nd}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{MnO}}_{3}$ $(0.49<~x<~0.75).$ A systematic transformation of the crystalline and magnetic structures of this system was observed. This can be consistently explaine…
In this article, the second part of a two‐part study, we report on the mechanical behavior of Ti 3 SiC 2 . In particular, we have evaluated the mechanical response of fine‐grained (3–5 μm) Ti 3 SiC 2 in simple compression and flexure tests, and we have compared the results with those of coarse‐grained (100–200 μm) Ti…
One way to increase the rate of an electrochemical process is to increase the area of the interface between the electrode and the electrolyte. A novel polymer electrode, with a very high effective surface area and a nanometer-scale continuous conducting network that extends into a large volume, is presented and its pr…
Diffraction intensities can be evaluated by two distinct procedures: summation integration and profile fitting. Equations are derived for evaluating the intensities and their standard errors for both cases, based on Poisson statistics. These equations highlight the importance of the contribution of the X-ray backgroun…
We propose a novel strategy using fullerenes for the construction of solar energy conversion systems that mimic the primary electron transfer events in photosynthesis. Redox-active fullerenes such as C60 and C70 were covalently bound to a porphyrin and the photophysical properties of the resulting compounds were inves…
X-ray-diffraction studies of nanometer-sized particles of zinc sulfide show a significant reduction in the zinc-blende-to-wurtzite phase transition temperature, as compared to the bulk value. Five nanoparticle samples were annealed in vacuum at temperatures increasing from room temperature (23 \ifmmode^\circ\else\text…
A metal nanoshell consists of a nanometer-scale dielectric core surrounded by a thin metallic shell. The plasmon resonance of metal nanoshells displays a geometric tunability controlled by the ratio of the core radius to the total radius. For gold-coated Au2S this ratio varies from 0.6 to 0.9, yielding a plasmon reson…
The advantages of combining carbon nanotubes with conjugated polymers for high-efficiency photovoltaic devices are explored in this article. The preparation and optical properties of a composite of multiwalled carbon nanotubes (MWNTs) and poly(p-phenylene vinylene) (PPV) are reported and the efficiency of a photovolta…