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。
A novel micropolarizer has been fabricated from alumina and nickel by means of anodization and electroplating techniques. Making use of the anisotropic microstructure of the anodized alumina film, a lattice of nickel columns is easily constructed in the film, which works as a wire grid type polarizer. The fabricated p…
Effective thermal conductivity of copper powders of different particle size has been measured experimentally at room temperature and normal pressure using the transient hot strip method. A variation in the values of the effective thermal conductivity of these powders with their porosities is observed. To explain this…
A transmission electron microscopy study of porous silicon reveals that pores selectively propagate in the 〈100〉 crystallographic directions on both n- and p-type silicon, independent of dopant concentration or anodization conditions.
A method has been proposed for calculation of the optical constants of a thin layer upon a transparent substrate only from the reflection spectrum into the region of transmission of the layer. The envelopes of the maxima of the spectrum R M and of the minima R m are used, taking into account the finite dimensions of t…
Molecular-dynamics simulations of two immiscible fluids confined between solid walls and sheared in a Couette geometry were performed as a function of shear rate for a range of wall and fluid properties. Changes with capillary number in the interface shape and dynamic contact angle were consistent with previous analyt…
A series of organic salts, in which the cation has been designed to have a large molecular hyperpolarizability, has been prepared. Variation of the counterion (anion) in many cases leads to materials with large powder second harmonic generation efficiencies, the highest of which is roughly 1000 times that of a urea re…
The Rutherford back-scattering spectrometry (RBS) technique has been used to investigate radiation-enhanced diffusion (RED) of silver in Ag-doped soda-lime glass bombarded with 9x10 15 ions cm -2 40 Ar + implanted at 280 keV. The depth distribution of Ar impurities was measured. Range and straggling data for 280 keV A…
The influence of the substitution positions of donors and acceptors on quadratic hyperpolarizabilities (β) was simulated by the AM1 method using four types of conjugated long-chain molecules having polydiacetylene structures. The chain-length dependences of β are greatly affected by the molecular type. The molecule, i…
A double-heteroepitaxial Si/γ-Al2O3/Si structure was realized. An epitaxial (100)Si layer with high quality was successfully grown on a (100)γ-Al2O3/(100)Si substrate by Si2H6 gas-source molecular beam epitaxy at substrate temperatures between 700 and 800 °C. The γ-Al2O3/Si substrate was fabricated by low-pressure che…
We describe the structure and operating characteristics of a high-speed optically addressed spatial light modulator (OASLM) with a hydrogenated amorphous silicon (a-Si:H) photosensor and a ferroelectric liquid-crystal modulator. The photosensor is a p-i-n photodiode, which switches the liquid crystal into one of two s…
The mobility of vacancies and interstitials trapped on a dissociated edge dislocation in copper is studied by molecular dynamics. Although fast diffusion is thought to occur exclusively in a pipe surrounding the dislocation core, in the present study a quasi-two-dimensional diffusion is observed for defects not only i…
Native silicon (Si) oxide growth on Si (100) wafers in air and in ultrapure water at room temperature requires coexistence of water and oxygen in the air and ultrapure water ambients. The growth rate data on n-, n+-, and p+-Si (100) in air indicate layer-by-layer growth of an oxide. The growth rate on n-Si (100) in ul…
We present two simple, but accurate, techniques for calculating the finite-temperature atomic structure and free energy of any solid defect (point or extended). The finite-temperature equilibrium atomic structure and thermodynamic properties of defects in solids are obtained self-consistently by minimizing the rree en…
The effects of hydrogen on the fracture of metals will be reviewed using a selection of observations based on the use of in situ environmental cell experiments. These were developed to allow understanding of the mechanisms of the failure process. The in situ technique, combined with use of the environmental cell, is w…
Development of manganese-stabilized stainless steels has been prompted by two objectives: (1) replacement of nickel, normally used to stabilize austenitic stainless steels, since it is an expensive, strategic material, and (2) reduction of long-term induced radioactivity of neutron-irradiated stainless steels by repla…
Abstract Photoreactive polyimide precursors, which are readily soluble in common organic solvents and optically transparent at light of 365 nm wavelength ( i ‐line), similar to aliphatic polyimide precursors, were obtained by polycondensation of biphenyltetracarboxylic dianhydride (BPDA) and fluorine‐containing diamin…
Abstract Both softwood (spruce) and hardwood (aspen and birch) species in the form of different pulps (e.g., sawdust, chemithermomechanical pulp, explosion pulp and OPCO pulp) have been used (10–40 wt% composite) as reinforcing fillers for thermoplastic composites of polystyrene. Mechanical properties, are examined, e…
Abstract In this study the grafting of acrylamide onto poly(ethylene terephthalate) fibers with the help of benzoyl peroxide and the effects of the temperature and the concentrations of initiator and monomer were investigated. Some of the experiments were repeated several times in order to check the reproducibility. T…
Dispersions of colloidal particles exhibit thermodynamic properties similar to those of molecular systems, including a hard sphere disorder-to-order transition. In experiments with organophilic silica in cyclohexane, gravity settling was used to concentrate the particles. With small particles the slow sedimentation pe…
Article The crystal structures of Ag+Cu2(OH)(SO4)2 ∙ H2O and Me+Cu2(OH)(SeO4)2∙H2O [Me+ = Ag, Tl, NH4], four new representatives of the natrochalcite type, with a note on natural natrochalcite was published on August 1, 1989 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 187, issue 1-4…