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 special test fixture has been developed for fracture mechanical testing of brittle materials inside an environmental scanning electron microscope. The fixture loads a double cantilever beam specimen with pure bending moments and provides stable crack growth. Crack growth is detected by in situ observation and acoust…
In the far anodic regime, the anodic dissolution of silicon exhibits a resonant behavior, which results from an oscillating behavior on the microscopic scale. The interface has been investigated using in situ infrared spectroscopy in the strong oscillating regime. The interface oxide film varies in thickness by up to…
Abstract The effects of heating and cooling rates on the structure of N660 and N299 carbon black particles have been investigated using Raman spectroscopy, X-ray scattering, and the BET technique. Carbon blacks were kept at 2700 K for various lengths of time and next cooled down at different rates. The size of crystal…
The paper describes an evaluation of kinetic parameters for sintering from the analysis of stepwise isothermal dilatometry data for the pore‐forming process of macroporous alpha‐Al 2 O 3 ceramics fabricated by extrusion. The experimental results demonstrated that isothermal shrinkage data for the sintering process can…
The mechanism of heat aggregation of proteins proposed by the author involves the stage of irreversible denaturation, the stage of nucleation, and the stage of growth of aggregates. It was shown that the initial parts of the kinetic curves of aggregation followed by monitoring the increase in absorbance (A) or intensi…
Hi‐Nicalon/SiC minicomposite specimens containing three oxide interphase layers (amorphous SiO 2 , monoclinic ZrO 2 , and amorphous SiO 2 ) were prepared by chemical vapor deposition. The minicomposites exhibited graceful composite failure behavior with reasonable load‐carrying capability in room‐temperature tensile t…
Ellipsometric studies are generally carried out in the reflection mode rather than in the transmission mode, requiring invariably opaque substrates or substrates in which the backreflection is minimized or suppressed by different methods. In the present research we used a transmission and reflection photoellipsometry…
In this study the wound healing response of full-thickness skin defects was enhanced through the use of acidic fibroblast growth factor using a collagen scaffold. The objectives of this study were (1) to compare the facilitatory effects of acidic fibroblast growth factor on the cellular response (fibroblast, neutrophi…
Studies are outlined which have led to the production of large samples, of dimensions 2-10 cm, of organic electro-optic materials. The perfection of these is defined. The influence of lattice imperfections on the evaluation of fundamental physical parameters related to electro-optic device behaviour is discussed. The…
The microscopic mechanism of diffusion-type solid-solid first-order transitions was studied in boron nitride. This substance exhibits an extreme case of transitions between very different lattices, hexagonal (graphite-like) and cubic (diamond-like) phases, accompanied by a large change in the volume. A boundary betwee…
The columnar arrangement of π-stacked phthalocyanines (Pcs) is a promising structure for materials with special optical, electrical, and photo- and semiconducting properties. The requirements for obtaining optimal materials properties are discussed, and approaches towards the synthesis of mesomorphic Pcs that satisfy…
The quiescent nonisothermal bulk crystallization kinetics of two high-density polyethylene resins were investigated by a modified light-depolarizing microscopy (LDM) technique. The technique allows studies at average cooling rates up to 2500°C/min. The polymer was found to crystallize at a pseudo-isothermal temperatur…
A numerical model is developed describing the very fast process of microstructure evolution under the common action of nucleation and diffusional growth of minority phase droplets during cooling of a hypermonotectic alloy through the miscibility gap. The model is validated comparing it with an analytical solution obta…
We report measurements of microwave loss in micron-size powders of the manganites La0.7Ba0.3MnO3 and La0.7Sr0.3MnO3, as functions of temperature and magnetic field. At zero field, the loss increases rapidly as the temperature is lowered below a frequency-dependent temperature T*. The more exciting observation is that…
A finite‐element model is developed and implemented on a massively parallel supercomputer to study the viscous sintering of a three‐dimensional (3‐D) configuration of three particles. Model development is described, implementation is discussed, and calculations are compared with benchmark results for a two‐dimensional…
Dodecavanadate rings of trans-edge-sharing VO5 square pyramids capped on each side by a square-shaped [B16O32(OH)4]20- polyborate unit form doughnut-shaped [V12B32O76(OH)8]12- clusters in the unprecedented polyoxovanadium borate compound (H3O)12[(VO)12{B16O32(OH)4}2]·28H2O (1). The [V12B18O76- (OH)8]12- clusters in 1…
Reviews the inherent advantages, i.e. design flexibility and processing, of manufacturing piezoelectric ceramics and composites with numerous architectures via rapid prototyping techniques. Reports on processing in which piezoelectric ceramics and composites with novel and conventional designs were fabricated using ra…
Equilibrium constants for the chemisorption reactions of molecular nitrogen with nickel clusters Nin have been determined as a function of temperature for n=19 to 71. Van’t Hoff analysis of the data yields standard-state changes in reaction enthalpy and entropy. These changes are related to what is known about nickel…
Electrical properties of semiconducting ZnO( n )‐CuO( p ) ceramic composites with varying composition were investigated. The electrical conductivity increased with increasing CuO volume fraction between 1 to 95 mol%. Impedance response showed three semicircles, indicating three resistive elements contributing to the t…
Supramolecular hydrogen-bonded networks have been prepared by self-assembly of a chiral bifunctional H-bond acceptor and achiral trifunctional H-bond donors. A stilbazole dimer, (R)-1,2-bis{4-\[2-(4-pyridyl)ethenyl]phenoxy}propane (1) has been synthesized for use as a chiral component for cholesteric networks. Compoun…