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。
Electrospinning of sol–gels has been used to produce zirconium‐doped polymer microfibers from zirconyl chloride and poly(vinylpyrollidone) precursors. Calcination of these structures between temperatures of 370° and 930°C resulted in the formation of zirconia nanograined microfibers whose diameters ranged from 1200 to…
The (pseudo)polymorphism of ethinyl estradiol was investigated via extensive crystallization experiments. Four new crystal structures of ethinyl estradiol solvates that resulted from this study are presented. They contain dioxane, nitromethane, ethanol, or dimethylformamide. The crystal structures of the hemihydrate,…
Current oscillations are used to study the effect of chlorate and perchlorate ions on the iron passivity in sulphuric acid solutions. Quasi steady-state current–potential and potentiostatic current–time curves show the emergence of complex current oscillations, besides the simple periodic ones attributed to general co…
Spherical aggregates of palladium nanoparticles were produced by stirring palladium(II) acetate with dendritic molecules (i.e., octa(3-aminopropyl)silsesquioxane octahydrochloride (POSS-NH3+) or the amine-terminated G1.0 poly(amidoamine) dendrimer (G1-NH2)) in methanol at room temperature via self-organized spherical…
We examine the effect of composition fluctuations on the stability of the orthorhombic Fddd network phase in the diblock copolymer melt phase diagram within the self-consistent Hartree approximation to the Landau-Brazovskii theory. For weak fluctuations, the Fddd structure is an equilibrium phase; however, stronger fl…
Two series of self-organized hexagonal arrays of uniaxial Permalloy nanowires are grown by electroplating, filling of nanopores in anodic alumina films. Nanowires with periodicities of 65 and 105nm and wire diameter of 25–60nm were investigated by magnetization and ferromagnetic resonance (FMR) measurements. The lengt…
Carbon black is widely used as an active filler in the rubber industry to improve the physical properties of rubber. The surface energy of carbon black is high compared to that of various elastomers like styrene–butadiene rubber (SBR), butadiene rubber (BR) and ethylene–propylene–diene rubber (EPDM). The work aims at…
Abstract Only few composites with tailored thermal expansivity exist, even fewer with negative thermal expansivity fillers, and none are well characterised. Zirconium tungstate has an isotropic negative coefficient of thermal expansivity, and the overall coefficient of thermal expansivity (CTE) of a range of zirconium…
Bi 4 Ti 3 O 12 (BIT) coprecipitated powders sinter in the presence of a transitory liquid phase, which strongly enhances the diffusion of matter and also the anisotropic growth of BIT grains. However, by coating the surface of BIT particles with WO 3 the aspect ratio of the platelets can be controlled. This, in additi…
Twenty thermophilic/thermotolerant fungal strains were isolated from compositing soils and screened for production of different enzymes (Endoglucanases, β-glucosidase, Fpase and xylanases) to assess their deinking efficiency. Three isolates, Aspergillus sp. AMA, Aspergillus terreus AN1,and Myceliophthora fergusii T4I,…
Phase equilibria in the ternary Nb-Ni-Y system are studied experimentally for the first time using x-ray diffraction, electron probe microanalysis, and differential scanning calorimetry in combination with levitation experiments. No ternary compounds exist, while the solubility of third element in binary solid phases…
A TiNi/diamond-like-carbon (DLC) microcage has been designed for biological applications. The structure is composed of a top layer of TiNi film and a bottom layer of highly compressively stressed DLC for upward bending once released from the substrate. The fingers of the microcage quickly close through the shape memor…
Shape-memory polymers (SMPs) are being increasingly proposed for use in biomedical devices. This paper investigates the cytotoxicity, surface characteristics and thermomechanics of two acrylate-based SMP networks as a function of sterilization using a minimal essential media elution test, FTIR-ATR and dynamic mechanic…
Facing up to matters: Template-assisted cofacial assembly of a ring-shaped polyoxomolybdate cluster (MC) by an oligomeric p-phenylenebutadiynylene rigid rod molecule bearing ammonium ion pendant groups (PBn) allowed for the formation of an inorganic/organic one-dimensional (1D) nanoobject. Studies indicate that the 1D…
The smallest size of a spin crossover particle which still exhibits hysteric behavior is an open question. It is clear that spin crossover is a cooperative phenomenon, which implies the dependence of the high spin fraction variation on the number of molecules within the system. We use the “atom-phonon coupling” model…
Kügelchen mit Feinstruktur: Eine Mikrokapillare liefert einheitliche Solvenströpfchen mit amphiphilen Polystyrol-Poly(ethylenoxid)-Diblockcopolymeren. Das Entfernen des Lösungsmittels führt zu Grenzflächeninstabilitäten und zur Aggregation der Polymere zu komplexen hierarchischen Mikropartikeln (siehe Bild).
Abstract This article reports the synthesis of conducting ferromagnetic complex of 3,4‐ethylenedioxythiophene (EDOT) and aniline (An) containing M‐type hexagonal barium ferrite (BaFe 12 O 19 ) particles using in situ emulsion polymerization and electrochemical oxidative polymerization. Magnetic and conductivity studie…
The combined‐stage sintering model was used to determine the activation energy, Q , of sintering for selected SiC‐based materials. SiC densified with a liquid (1.65 wt% Al) had an activation energy of 842±79 kJ/mol, a value between those for a silicon carbide densified with 1 wt% C and 0.25 wt% B 4 C ( Q =643±37 kJ/mo…
Lanthanum oxide (La(2)O(3)) films with good hemocompatibility and antibacterial properties have been fabricated using dual plasma deposition. X-ray photoelectron spectroscopy (XPS) shows that La exists in the +3 oxidation state. The band gap of the materials is determined to be 3.6 eV. Activated partial thromboplastin…
For temperatures >1973 K, the thermodynamic and kinetic analyses of the major gaseous species for a liquid titanate layer would vaporize significantly less than a silicate layer, when considering these layers as a protective barrier for ultrahigh temperature ceramic composites. At 2500 K, the major species is TiO(…