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 nonionic surfactant (CMR-100) containing a mixture of C6–C22 sorbitan esters was tested to improve the filtration rate of phosphogypsum produced from a South Florida phosphate concentrate at different sulfate levels. Tests were carried out on a lab-scale under operating conditions that simulate, to a large extent, t…
Three different experimental techniques [compression experiments at low strain rates, instrumented falling-weight impact tests, and dynamic mechanical analysis (DMA)] have been used for the mechanical characterization of a collection of crosslinked closed-cell polyolefin foams of different chemical compositions, densi…
Recent advances in COI’s oxide–oxide CMC materials will be presented including basic processing steps, updated material properties, and fabrication techniques. Material properties of COI’s alumino-silicate system reinforced with various oxide fabrics will be compared, along with progress in developing a 1200°C oxide m…
Chitosan is effective at removing platinum from dilute solutions, but sorption properties are significantly affected by the presence of competitor anions, such as chloride and, especially, sulfate anions. Sorption capacities in such complex solutions are enhanced by grafting thiourea through glutaraldehyde linkage. Th…
During the last years, two new subjects among the others have raised interest in the field of small scale electric power generation: advanced microturbines and solid oxide fuel cells. This paper investigates the thermodynamic potential of the integration of the solid oxide fuel cell technology with microturbine system…
Simply dipping polyethyleneimine-modified surfaces into aqueous solutions of acid-functionalized Au55 clusters generates two-dimensional hexagonal and cubic arrangements of the clusters. The picture shows the transmission electron micrograph of the cubic arrangement; the bar length corrsponds to 10 nm.
Various segmented polyurethane materials with a polyurethane hard segment (HS) content of 40 wt % were prepared by bulk polymerization of a poly(tetramethylene ether) glycol with Mn of 2000, 1,4-butanediol, and various diisocyanates. The diisocyanates used were pure 4,4′-diphenylmethane diisocyanate (MDI), 2,4-toluene…
Simply dipping polyethyleneimine-modified surfaces into aqueous solutions of acid-functionalized Au(55) clusters generates two-dimensional hexagonal and cubic arrangements of the clusters. The picture shows the transmission electron micrograph of the cubic arrangement; the bar length corrsponds to 10 nm.
The strongest antiferromagnetic coupling to Gd(III) so far reported was found for the complex [Gd(Hbpz(3))(2)(dtbsq)] small middle dot2 CHCl(3) (1; Hbpz(3)=hydrotris(pyrazolyl)borate; dtbsq=3,5-di-tert-butylsemiquinonato; see structure). At 245 K the magnetic susceptibility of 1 is lower than expected for two uncorrel…
Bridging azido ligands transmit both ferro- and antiferromagnetic interactions. The sheetlike structured complex [Ni(µ-N(3))(2)(N,N-Et(2)-N'-Me-en)](n) (see picture) exhibits a range of magnetic behaviors at low temperature. Short-range ferromagnetic and three-dimensional antiferromagnetic ordering compete, giving met…
Epidermis has a thickness of 0.07 to 1.4 mm and serves to protect the body surface against physical and ultraviolet injury, to provide a barrier to water and chemicals, and to resist microbial penetration. The presence of disulfide bonds within the keratin layer and the desmosomal attachments between the epithelial ce…
Metal-containing silsesquioxane derivatives provide new catalysts with both homogeneous and heterogeneous applicability. The steric and electronic properties of silsesquioxane silanolate ligands render metal centers more Lewis acidic than conventional alkoxide or siloxide ligands do. This concept has been exploited in…
The emission of electromagnetic waves from a source within or near a non-trivial medium (with or without boundaries, crystalline or amorphous, with inhomogeneities, absorption and so on) is sometimes studied using the reciprocity principle. This is a variation of the method of Green's functions. If one is only interes…
The polyurethane composites with conducting carbon black (CB) were prepared by a solution-precipitation process, which was followed by melt compression molding. The polyurethane used has good shape memory effect. The morphology of CB fillers in polyurethane matrix and the resulting conductivity of the composites were…
A practical approach of transferring a hexagonal array of nanosized pores produced in porous alumina into silicon and other substrates is discussed. The alumina pores have dimensions of 25–250 nm pore diameters and 50–300 nm pore spacings depending on the anodization conditions used. The characteristics of the alumina…
The Landau-Ginzburg theory of ferroelectricity predicts the intrinsic coercive field for polarization reversal, but the observed extrinsic coercive field is always much smaller as a result of nucleation, dynamic processes not covered by the static theory. We have realized the intrinsic coercive field for the first tim…
The ordinal name Helotiales Nannfeldt, in common use for over 60 years, was not validly published, since it was based on an invalidly published family name, Helotiaceae Rehm.Rehm's family name has recently been conserved, but since the ordinal name is still technically incorrect, steps are taken here to validate it.
Theoretical background of bridging bond formation of dissimilar metal atoms mediated by an oxygen atom is given for the system Ca(OH)2-SiO2. Physicochemical significance of low coordination state is emphasized in conjunction with higher reaction probability. A solid state addition reaction at room temperature is shown…
Problematics, choice of adequate calculational scheme and obtained results in the first-principles simulations of potassium niobate (in different ferroelectric phases), pure and Li-doped potassium tantalate, and lithium niobate are discussed. The ferroelectric instability, zone-center TO phonons, and crystallographic…
It is necessary for material suppliers to know a relationship between specifications of device and those of materials used, in order to develop a suitable material for the target device. A computer simulation is one of the effective methods for this purpose. In this paper, an example of static magnetic field analysis…