Materials Literature
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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…
Abstract Concurrent measurements of transmitted polarized light intensity and recording of the phenomenon of crystallization through polarized optical microscopy have resolved some of the controversies on the bulk crystallization behavior of poly(aryl ether ether ketone) (PEEK). The process of bulk crystallization was…
SUMMARY The brown alga Sphacelaria rigidula Kützing synthesizes cellulose microfibrils as determined by CBH I‐gold labeling. The cellulose microfibrils are thin, ribbon‐like structures with a uniform thickness of about 2.6 nm and a variable width in the range of 2.6‐30 nm. Some striations appear along the longitudinal…
Abstract New fluoropolyether polyolic resins are presented suitable to be cured with conventional hardeners as polyisocyanates or melamines. These resins are prepared by addition of fluoropolyether macrodiols (Fomblin® ZDOLTX) of various molecular weights to isophorone diisocyanate (IPDI) to give oligomeric NCO‐termin…
The isothermal section of the Ti‐B‐C system at 1600°C for compositions in and adjacent to the TiB 2 ‐TiC x ‐Ti 3 B 4 compatibility triangle was revised to reflect the fact that Ti 3 B 4 is an equilibrium phase in this system. Lattice parameter measurements together with image analyses of SEM micrographs of densifled c…
Abstract The properties of ultralow‐density polyethylenes (ULDPE) have been studied using temperature rising elution fractionation (TREF) as both an analytical and preparative process. TREF was employed to determine the short chain branch distribution and to fractionate the polymer into fractions that enabled further…
Layered polysilane synthesized according to a new recipe was characterized mainly by photoluminescence (PL) measurement. The PL spectrum of the as-prepared sample had a broad peak at 2.0 eV. The PL peak of a sample annealed at 300°C was also at 2.0 eV, and its PL intensity was several times greater than that of the as…
Ten polypyromellitimides, seventeen poly(imide esters) and six poly(imide amides) have been synthesized. The stability of 0.5% solutions of the poly(amic acids) in DMF, and the hardness, adhesion to glass and quality of nematic liquid crystal alignment of the polyimide layers using the interference wedge method have b…
Fluorinated Bis-GMA was synthesized and used with other commercially available fluorinated monomers and diluents to prepare hydrophobic composites. The composites were formulated as one-paste systems and were polymerized using blue light. Mechanical properties and water-related qualities were determined. Fluorination…
Abstract A novel approach to the extrusion of high‐density, rigid PVC foam uses commercial RPVC compounds with inert‐gas physical blowing agents (carbon dioxide and argon). The process was developed on a segmented single‐screw extruder with L/D of 40. On‐line monitoring of process variables was also carried out. This…
A `free-standing' microdisplacement calibrator is described which utilizes a previously proposed but untested design of monolithic x-ray interferometer. The monolith is driven by a twist-compensating electromagnetic actuator and a specially designed 1 ppm current source and is held, along with its x-ray source and det…
A simple closed-form expression has been derived for the instrumental broadening function of the general Barrels five-crystal diffractometer. The use of this result allows the extraction of sample rocking-curve widths from the measured widths. Such use facilitates the determination of dislocation densities in heteroep…
Improved powder XRD patterns for the titanium suboxides, Ti n O 2 n −1 (4≤ n ≤9), have been calculated from published single-crystal structures. To provide the best match with experimental data, the entire diffraction traces were simulated, and d -spacings and intensities extracted in the same manner as from experimen…
A laboratory study was conducted to examine the effects of increasing concentrations of oxalate and citrate anions on soil phosphate (P), aluminum (Al), and iron (Fe) solubility and P sorption/desorption from some volcanic ash soils. Duplicate 1.0 g soil samples were shaken with 10‐mL portions of 0.01M NaCl solution c…
Intrinsic defects of the nearly stoichiometric (110) surface of TiO2 have been studied by means of scanning tunneling microscopy. Temperature treatment at 870≤T≤1070 K in ultrahigh vacuum induces changes of the orientation of single steps. Line defects along [001] and oxygen vacancies are formed simultaneously as pred…
A new method to obtain nearly homeotropic alignment with small pretilt angles off the substrate normal employing vacuum oblique evaporation of SiO x has been developed. Selected pretilt angles in the range of (0–5) degrees can be easily obtained with this method and it is not very sensitive to the deposition angle, an…
Inducer expulsion, a phenomenon in which rapidly metabolizable sugars cause cytoplasmic dephosphorylation and efflux of pre-accumulated sugar-phosphates (sugar-P), has been documented for Streptococcus pyogenes, Streptococcus bovis, and Lactococcus lactis, but not for other Gram-positive bacteria. Using intact cells a…