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。
Abstract Cyclic olefin copolymers comprise a new class of polymeric materials showing properties of high glass-transition temperature, optical clarity, low shrinkage, low moisture absorption, and low birefringence. There are several types of cyclic olefin copolymers based on different types of cyclic monomers and poly…
The lattice of (001)-oriented BiFeO3 epitaxial thin film has been identified by synchrotron x-ray diffraction. By choosing proper scattering zones containing the fixed (001) reflection, we have shown that low-symmetry phases similar to a MA phase exist in the thin film at room temperature. These results demonstrate a…
We adapt Takahashi's modified spin-wave theory to the context of nano-magnets, and apply it to the molecular compound based on the giant magnetic molecule Mo72Fe30. This involves solving numerically the mean-field equations and then forcing the sublattice magnetizations to zero by means of local chemical potentials fo…
We have investigated the magnetic properties of (Ga,Mn)As thin films with Mn concentration between 1 and 9%. Ferromagnetic transition temperatures TC of up to 173K are observed. The results are compared to the predictions of the Zener mean‐field theory. We find no evidence of a fundamental limit to TC.
We performed neutron powder diffraction experiments on lithium imide Li2NH, and have proposed a revised crystal structure model. Li2NH has a face-centered cubic structure with a partially occupied hydrogen site. Of the possible crystal structure models that represent the obtained data, the model with F-43m symmetry ha…
In this paper, we present a shielding and absorbing composite based on carbon nanotubes (CNT) dispersed inside a polymer dielectric material. The extremely high aspect ratio of CNTs and their remarkable conductive properties lead to good absorbing properties with very low concentrations. A broadband characterization t…
We apply periodic density functional theory to alpha-MoO3 and its (010) surface. The formation energy and structure of defects in the form of surface oxygen vacancies are found to depend critically on the treatment of electron localisation which is achieved in the periodic model using the DFT + U method. Calculated vi…
Tin chlorides, SnCl2 and SnCl4.5H2O are excellent catalysts for the reactions of trioses, dihydroxyacetone and glyceraldehyde with alcohols (MeOH, EtOH and nBuOH) to give alkyl lactates, whose reaction mechanism involves the intermediary formation of pyruvic aldehyde followed by its esterification, which is distinctiv…
The results of a study of the sulfur tolerance of solid oxide fuel cells (SOFCs) with composite anodes containing Cu, , and YSZ are presented. When operating a SOFC with anodes on fuel containing sulfur impurities in the form of at 1073 K it was found that levels up to 450 ppm had no effect on anode performance. At hi…
A series of tetragonal zirconia-supported CuO oxide catalysts with various CuO loadings were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), electron spin resonance (ESR), ultraviolet and visible diffuse reflectance spectroscopy (UV/vis-DRS), and temperature-programmed reduction (TPR)…
Abstract An investigation was conducted on the ASTM Standard Test Method for Tensile Properties of Polymer Matrix Composites (D 3039). This investigation consisted of both preliminary testing and an interlaboratory test program. Information generated from preliminary testing was used to determine the effects of variou…
Nanoporous composite films of multi-walled carbon nanotubes (MWNTs) and polyaniline (PAn) were grown electrochemically from acidic aqueous solutions, such that the constituents were deposited simultaneously onto graphite electrodes. Scanning electron microscopy (SEM) revealed that the composite films consisted of nano…
Abstract Supergene leaching, oxidation, and chalcocite enrichment in porphyry and related Cu deposits take place in the weathering environment to depths of several hundred meters. The fundamental chemical principles of su-pergene processes were elucidated during the early decades of the twentieth century, mainly from…
The reason for secretion of nucleoside diphosphate kinase (NdK), an enzyme involved in maintaining the cellular pool of nucleoside triphosphates in both prokaryotes and eukaryotes, by Mycobacterium tuberculosis is intriguing. We recently observed that NdK from M.tuberculosis (mNdK) localizes within nuclei of HeLa and…
In intermediate temperature solid oxide fuel cells (SOFCs), the use of cost-effective chromia-forming alloy interconnects such as ferritic stainless steels can lead to severe degradation in cell performance due to chromium migration into the cells at the cathode side. To protect cells from chromium poisoning and impro…
Nanoparicles smaller than 100 nm have been expected to reveal the novel physical and chemical properties that differ from the corresponding bulk materials. And nanoparticles are to be used as constituents for many applications in the various fields. These applications include the electronic, magnetic, optoelectronic a…
Regenerated silk fibroin from Bombyx mori silkworms was extruded into fibers from a 1-ethyl-3-methylimidazolium chloride ionic liquid solvent system; the drawn fibers rinsed in methanol exhibit alignment of the β-sheet crystallites along the fiber axis.
Novel chiral compounds possessing molecular biaxiality, T-shaped and bend-shaped compounds, have been prepared and the physical properties investigated. The T-shaped chiral compound was found to show a blue phase with a wide temperature range on cooling. A double twist structure formed by the T-shaped compound can sta…
To enhance its pseudocapacitance, ruthenium oxide must be formed with a hydrated amorphous and porous structure and a small size, because this structure provides a large surface area and forms conduction paths for protons to easily access even the inner part of the RuO2. In this study, we report that highly dispersed…
The purpose of this paper is to give a short overview of existing technologies regarding phase shifting transformers (PST's). A classification is made based on the symmetrical or asymmetrical and on the direct or indirect character of the PST. As a case-study, the PST's in Meeden, The Netherlands are studied more prof…