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。
Migration-generating equipment using a vacuum technique was constructed to measure the migration properties of antidegradants to the surface in compounded rubber in a short time. With this equipment, the migration of antidegradants to the surface is accelerated by the fast evaporation of organic molecules on the surfa…
Several fire-resistant formulations were prepared from a sample of poly(vinyl chloride) (PVC), small variable proportions of chloroorganic adducts [1,2,3,4,7,7-hexachloro-5-carboxy,bicyclo(2,2,1)heptene-2] or [1,2,3,4,7,7-hexachloro-5-carboxy,5-methyl-bicyclo(2,2,1)heptene-2] as fire-retarding modifiers, plasticizers…
The effects of some polymerization conditions on poly(vinyl chloride) (PVC) particles produced by the suspension polymerization process were studied on a laboratory scale. The different stages of vinyl chloride suspension polymerization were investigated experimentally by using an on-line sample withdrawal technique d…
The degree of mechanical reinforcement that could be obtained by the introduction of henequen cellulosic fibers in a low-density polyethylene, LDPE, matrix was assessed experimentally. Composite materials of LDPE-henequen cellulosic fibers were prepared by mechanical mixing. The concentration of randomly oriented fibe…
This article reports the effect of cell structure on oil absorption of highly oil-absorptive polyurethane foam (ON-PUR), which is suitable for on-site foaming. We have developed ON-PUR as an oil absorbing polyurethane foam using a very reactive recipe. ON-PUR was synthesized by mixing polyol, water, additives, and pol…
Transcrystallization of isotactic polypropylene (iPP) on different fibers (carbon fiber, glass fiber, and aramid fiber) was conducted in a temperature gradient. The Ultra-High-Module carbon fiber (UHMCF), the High-Module carbon fiber, and the aramid fiber (Twaron) showed sufficient nucleation ability to form transcrys…
High cell density fed-batch fermentation of Alcaligenes eutrophus was carried out for the production of poly(3-hydroxybutyrate) (PHB) in a 60-L fermentor. During the fermentation, pH was controlled with NH(4)OH solution and PHB accumulation was induced by phosphate limitation instead of nitrogen limitation. The glucos…
An infinite, one-dimensional chelating ligand [P3Se] is present in K3RuP5Se10 (depicted on the right), which was obtained by the reaction of ruthenium with a molten mixture of nominal stoichiometry K3P6Se26.5 at 490°C. K3RuP5Se10 is the first structurally characterized ruthenium chalcophosphate, and features very shor…
Reversible CC bond breaking/making as well as drastic change in color are induced upon electron transfer in the novel redox couples of hexaarylethanes 1 and bis(triarylmethyl) dications 22+. Their hysteretic redox behaviors result from the quite different geometries of 1 and 22+. Ar = p-Me2NC6H4, p-MeOC6H4.
The linear FeOFe bridge in μ-oxo tetraphenylporphyrin iron(III) dimer can be protonated without structural rehybridization at the O atom (the structure of the μ-hydroxo-bridged complex is depicted on the right). Antiferromagnetic coupling between the iron centers is greatly attenuated, and proton self-exchange is sl…
Resonant Raman and nuclear magnetic resonance spectroscopies from single gallium arsenide quantum dots are demonstrated. The nuclei were probed through changes in the optical spectra of the quantum dot exciton arising from exciton-nuclear interactions. This approach allowed the application of optical spectroscopy with…
We study the rate of activated motion over multiple barriers, in particular the correlated double-jump of an adatom diffusing on a missing-row reconstructed Platinum (110) surface. We develop a Transition Path Theory, showing that the activation energy is given by the minimum-energy trajectory which succeeds in the do…
Hexagonally structured, mesoporous platinum (see picture on the right) is obtained by reduction of platinum salts in lyotropic liquid-crystalline phases. The template can be removed from the nanostructured metal colloid without affecting its structure.
A novel method for fabricating inhomogeneous thin film optical interference filters is discussed. Glancing angle deposition (GLAD) and substrate motion are used to create a single material thin film with periodic index variation as a function of thickness. Filters fabricated with this technique promise to be much simp…
The sonoluminescence of ionic semiconductors were studied. The main attention is paid to threshold phenomena which accompany the light irradiation, namely --- point defect creation and nonlinear ultrasound wave attenuation. The model for description of processes under investigation which connects the sonoluminescence…
Polypyrrole (PPy)-poly(ether urethane) (PEU) composite films were prepared via the chemical polymerisation of pyrrole in a tetrahydrofuran solution of PEU containing copper(II) chloride and lithium perchlorate, and subsequent casting. The electrical conductivity of the composite film (weight ratio of pyrrole to PEU 1:…
The microstructure and resulting properties of manual metal arc super duplex weld metals deposited using three different filler metals and two heat inputs were investigated using various techniques. Analytical transmission electron microscopy, electron probe microanalysis, and scanning electron microscopy were used to…
Superresolution performance of a plano-convex lens made of absorbing glass is analyzed numerically. It was found that a reduction of the radius of the Airy disk depends solely on the center transmittance of the lens (a zero edge thickness is assumed) for any reasonable ratio of radius of curvature of the convex surfac…
In previous work, we have found for the first time that, besides the known conditions that influence the selectively reflected lightband from cholesteric liquid crystals. the physical sorptive properties of their supports also influence the reflected wavelengths. Thus, it was possible to differentiate metal oxides wit…
Abstract Breakdown and corona are investigated in clean and dust‐polluted rod‐rod air gaps varying gap length, rod radius and voltage polarity. It is shown that similar to previous results under impulse voltages, dust pollution can significantly reduce the DC breakdown voltage values of such gaps which depends upon el…