Materials Literature
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The title materials are stuffed cristobalites possessing moderate to extreme pseudosymmetry. On the bases of their X-ray powder diffraction patterns, the Mg, Zn, and Cd compounds had been previously reported as cubic and, more recently, the Zn phase as orthorhombic. Newly measured X-ray powder diffraction data demonst…
Two methods for the polymer coating of monodispersed colloidal silica and for the control of layer thickness by radical polymerization were examined. Consecutive radical polymerization of styrene on the prepolymer-coated silica by periodic addition of 2,2′-azobis(isobutyronitrile) in ethanolic solution induced the agg…
The power loss of electrical steel sheet given in the data sheets of the steel manufacturers is related to linearly alternating flux conditions, measured with an Epstein frame or a single sheet tester, respectively. In the application of the material in electrical machines, we find large areas with rotational flux con…
Porous silicon layers with red, orange and yellow luminescence were prepared by anodizing silicon wafers in HF-ethanol solutions with different HF concentrations. Temperature dependence of the photoluminescence was systematically measured. The results show that the red emission of a sample prepared in solution with hi…
The paper presents theoretical calculations of grazing incidence X-ray reflectivity curves for iron and nickel crystals. The computer simulations based on Fresnel theory take into account damping (as the result of surface roughness), which is different from the usual Rayleigh damping. The calculations are performed fo…
Air sensitive single crystals of K2Ni3S4 have been synthesized by reaction of 1Ni, 2K2S and 4S in an evacuated silica tube at 750°C for 6 days. The structure was solved in the Fddd space group with a = 5.723(2)Å, b = 10.040(3) Å and c = 26.059(7) Å. The refinement led to RF = 0.038 (RwF = 0.045) for 23 variables and 3…
The effect of the interchange reactions of poly(ethylene terephthalate) (PET) on its molecular weight distribution (MWD) was analyzed using a Monte Carlo simulation method. Three kinds of motions, which correspond to the direct ester(SINGLEBOND)ester interchange reaction, alcoholysis, and internal alcoholysis in polye…
Cross-like rigid multipodes consisting of a spyro center unit and arms containing one or two phenyl units designed for molecular reinforcement effects are considered. The expectation based on theoretical considerations was that such multipodes would display an enhanced solubility both in low molar mass solvents and in…
Cavitation bubbles were generated by the 193 nm argon fluoride excimer laser delivered with a specially designed tip into absorbing NaCl solution. The dynamics of bubble formation and collapse have been studied using fast flash photomicrography. The bubble dimensions were measured at different time delays as a functio…
An atomic level analysis of the effect of crystal defects such as free surfaces, dislocations and grain boundaries on the martensitic transformation in bcc Ti, Ti - 15V (atom %) and Ti - 25V (atom %) has been carried out using the embedded atom method (EAM) interatomic potentials to quantify the atomic interactions an…
We present non-equilibrium molecular dynamics (NEMD) simulations of planar Couette flow for models for normal (n-butane) and isomeric butane (i-butane) molecules. Two of the three classes of models used here are collapsed atom models while the third class is an atomistically detailed model. In general agreement with p…
Image processing has been used as a tool to determine the trash content in cotton webs. The experiments showed that in particular seed coat particles are difficult to separate from the cotton during cleaning processes whereas neps, leaf and wooden fragments can easily be removed. A correlation between the number of se…
L’augmentation de la vitesse de refroidissement sur la table de sortie du train à bandes doit permettre de produire des aciers de résistance à partir d’une composition chimique moins chère et de développer de nouvelles qualités d’acier.
The effect of discharge treatments such as low-temperanire plasma treatment, atmospheric lowtemperature plasma treatment and sputter-etching on the surface characteristics of different textile fibres and polymeric materials has been investigated. The plasma treatment causes mainly chemical modification and increases w…
Control of supramolecular organization by weak noncovalent interactions is demonstrated in a series of crystalline materials based on functionalized porphyrin building blocks. The monomeric units associate via metal-ligand binding, hydrogen-bonding and halogen-halogen interactions into pseudo-rigid polymeric arrangeme…
Some of the 4-arylmethyleneamino-TEMPO (2,2,6,6-tetramethyl-piperidin-1-oxyl) radical crystals showed an intermolecular ferromagnetic interaction. The X-ray structure analyses were performed on 4-arylmethyleneamino-TEMPO crystals (aryl = phenyl, p-chlorophenyl, p-biphenyl, p-phenoxyphenyl, p-bromophenyl, 3,5-dichlorop…
Abstract Die Darstellung von Li 2 PtH 2 gelang aus Li 5 Pt 2 H 9 durch eine Abbaureaktion bei 220°C in einer Argonatmosphäre. Röntgenographische Untersuchungen an pulverförmigen Proben und elastische Neutronenbeugungsexperimente an der deuterierten Verbindung führten zur vollständigen Strukturaufklärung. Li 2 PtH 2 kr…
Abstract Interpretation of K-Ar determinations of the apparent age of crystallization of diagenetic potassic layer silicates should take into account the current ideas concerning the smectite to illite conversion of clay minerals. These minerals are the major K-bearing neogenic phases in sedimentary rocks and, therefo…
Abstract A discussion of the electronic energy bands and lattice dynamics of pure and lithium‐intercalated InSe is presented. After a review of the structure of this material and its polytypes, experimental results on both optical absorption and photoluminescence are compared for the pure and lithiumintercalated cases…
Ti-13Nb-13Zr (Ti-13-13TM) is a new titanium alloy developed for medical implant applications. In the oxygen diffusion hardened condition, Ti-13-13 and titanium alloys which possess zirconium, are hardenable at temperatures of 400 to 600°C with the end result being a passive, mechanically stable, abrasion resistant oxi…