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 stoichiometric perovskites RMnO3 (R = rare earth) experience Jahn–Teller (JT) transitions as a function of temperature and R size similar to that recently described for LaMnO3. We have investigated the JT transition for R = Pr by ATD techniques and neutron powder diffraction. This transition takes place at approxi…
Amorphous nitric acid hydrates in the concentration range 25 to 50 mol% HNO3 were prepared by low-temperature quenching of the respective HNO3/H2O aerosols. Subsequently, a properly selected thermal treatment enabled the phase distribution of two thermodynamically stable (NAM, β-NAT) and three metastable phases (α-NAD…
Variation in defect microstructures introduced by compression of three fcc metals, Al, Cu and Ni, was investigated over a wide range of strain rate, from 10 m 2 to 10 6 /s. Dislocations formed under high-speed deformation are randomly distributed, whereas dislocations formed under low-speed deformation develop into ce…
Metallic materials display strong size effect when the characteristic length of deformation is of the order of microns. The theory of mechanism-based strain gradient (MSG) plasticity established from the Taylor dislocation model has captured this size dependence of material behavior at the micron scale very well. The…
This paper describes magnetic properties and microwave absorption properties of polymer-protected cobalt nanoparticles. Cobalt nanoparticles were prepared using the thermal decomposition of dicobalt octacarbonyl in ethylene glycol. They were stabilized and dispersed by coexisting with poly(N-vinyl-2-pyrrolidone) (PVP)…
Abstract Components of commercial nuclear reactors are subjected to neutron bombardments that can modify their mechanical properties. Prediction of in-service and post-service behaviors generally requires irradiation in so-called “test reactors” as well as subsequent mechanical testing in specialized hot cell faciliti…
Native cellulose samples with high crystallinity were pyrolyzed up to above 2000 C and the resulting carbon structures were examined. The drying method for water-swollen or water-suspended cellulose prior to pryrolysis was found to significantly affect preservation of the large surface areas of the original cellulose;…
The crystallization of 2,4,6-triethynyl-1,3,5-triazine (2) leads to a pi-stacked layered structure of a C(sp)-H...N hydrogen-bonded unique hexagonal network structure, which may be regarded as a supramolecular analogue of a hitherto unknown graphyne network: in-plane intermolecular interactions are short and linear H.…
Fibroin, the core of the silk filament protein, has been proposed as a biomaterial for different biomedical applications since it can be engineered as a thread, fabric or film. Infrared spectroscopy suggests that the dissolution of the fibroin filaments and subsequent casting of the fibroin solution into films followe…
Anodic formation of oxide films on titanium surfaces, in various concentrations of aqueous KOH solutions, have been studied using ellipsometry and micro-Raman spectroscopy. By in situ ellipsometric measurements the coefficient of film thickness growth and indexes of refraction of anodic oxide films have been determine…
Arylnitroso dienophiles exist in equilibrium with their dimeric counterparts, which in turn form stable bidentate complexes with scandium(III) triflate and react with cyclohexadiene to give the corresponding Diels-Alder adduct at the same rate as the normal thermal process.
Analytical models of the penetration process focus on estimating depth of penetration based on target density, target strength (sometimes associated with the unconfined compressive strength of the target for geological targets), the areal density of the penetrator (W/A), and the impact velocity. In this paper, an expr…
This study investigates the internal fibrillation of chemical pulps, with a focus on how the pores in once dried chemical pulps are reopened in beating. A novel thermoporosimetry technique was used to measure the change in pore size distribution (PSD) and pore volume during drying and beating. This technique is based…
Nanocomposite Al-based alloys can be obtained with a combination of amorphous, crystalline and quasicrystalline phases. In order to understand the correlation between the nanostructure and the mechanical behaviour, four nanocomposite alloys with different characteristics were studied: two alloys from the Al–Fe–Cr–Ti s…
Conducting polymer bilayer films containing polypyrrole/dexamethasone sodium phosphate as an inner film and poly(N-methylpyrrole)/polystyrenesulfonate or self-doped polyanilinesulfonate as an outer film were prepared by electrochemical and chemical methods. The controlled release of dexamethasone sodium phosphate (DMP…
The mechanism and energetics for the formaldehyde to formic acid and the formic acid to carbon dioxide conversions are investigated using the FeO + complex as an oxidant from theoretical calculations at the B3LYP DFT level. In the oxidation processes, there are a lot of reaction branches which are comparable in energy…
The antisolvent crystallization of sodium chloride was carried out in batches to observe crystallization phenomena using ethanol as an antisolvent. To decrease high local supersaturation generated by the addition of antisolvent, the authors have proposed a new idea by choosing high ethanol concentration operational co…
A theoretical model is presented for of magnetoelectric effect in bilayer and multilayer composites. A novel approach to take into account the actual boundary conditions in multilayer composites is proposed. An averaging method is used for deriving effective material parameters in composites. The effect of dielectric…
The resonance stabilized dithiazolo-dithiazolyl radical 1b adopts a slipped π-stack structure exhibiting weak 1-D ferromagnetic coupling; variable temperature conductivity measurements indicate σRT = 2 × 10−6 S cm−1.
MCM-41 was found to be an active heterogeneous catalyst for the synthesis of nopol by the Prins condensation of beta-pinene and paraformaldehyde, but Sn-MCM-41 in which Sn has been grafted on MCM-41 by chemical vapor deposition is far more active and combines high efficiency and recyclability.