Materials Literature
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Abstract Siliconized epoxy‐matrix systems have been developed by an interpenetrating mechanism using epoxy resins GY 250 and LY 556 (Ciba‐Geigy) and hydroxyl terminated polydimethylsiloxane with γ‐aminopropyltriethoxysilane as crosslinker in the presence of dibutyltindilaurate catalyst. Aliphatic amine (HY 951, Ciba‐G…
Abstract This paper examines the ion-exchange properties of synthetic zeolite Na-P c , which was produced from perlite-waste fines and has a SiO 2 :Al 2 O 3 ratio of 4.45:1 and a cation-exchange capacity (CEC) of 3.95 meq g −1 . Although equilibrium is attained rapidly for all three metals, exchange is incomplete, wit…
Various issues associated with the design and mechanical evaluation of joints of ceramic matrix composites are discussed. The specific case of an affordable, robust ceramic joining technology (ARCJoinT) to join silicon carbide (CG-Nicalon™) fiber-reinforced-chemically vapor infiltrated (CVI) silicon carbide matrix com…
Oxide scale that mainly consists of spinel-type metal oxides is formed on stainless steels when they are heated up during the manufacturing cycle. The removal of the oxide scale and chromium depleted subscale by pickling is one of the most important processes during the production. Electrolytic pickling in neutral sod…
Spectral studies of the cubic spinel ferrites Zn1—xCuxCr0.8Fe1.2O4, 0 ≤ x ≤ 1 are carried out at room temperature by X-ray, Mössbauer and IR spectra. The deduced X-ray parameters have been studied as functions of x. The average and true lattice parameters (ā and a0), the theoretical and bulk densities (DX and D), and…
A simplified model for studying the behavior of plain woven fabrics is presented. The model consists of two plate elements including a thin layer of matrix between them. Hierarchic shape functions are employed to characterize the initially curved profile of the yarns and the displacements of the plate elements. The pl…
Using a physically motivated continuum model for the free energy of an elastomer with a smectic or lamellar microstructure, we examine the effects of coupling between the smectic and the rubber-elastic degrees of freedom on measurements of the layer structure and elastic moduli. In agreement with experiment, we find t…
Compression and tension tests were performed on liquid‐phase‐sintered β‐SiC fabricated by hot‐pressing, using ultrafine powders, at 1973–2048 K in an N 2 atmosphere. Amorphous phases were observed at the grain boundaries and at multigrain junctions in the as‐sintered material. Strain hardening was observed under all e…
This PDF contains the communication section including Experimental realization of sculptured-thin-film polarization-discriminatory light-handedness inverters
The structure of synthetic YbFeMnO(4) has been refined by single-crystal X-ray diffraction. Space group R3m, a = 3.4580 (1), c = 25.647 (3) A, V = 265.59 (3) A(3), Z = 3. Yb is in octahedral coordination, whereas Fe and Mn are disordered on a single crystallographic type of trigonal bipyramid, in which the cation is o…
Guest host systems composed of various types of esters of (2-hydroxypropyl) cellulose and the chromophore coumarin 334 were characterized with respect to the absorption and emission properties as a function of the concentration of the chromophore and the nature of the esters. The results were compared with the ones ob…
A palette of computational techniques are employed for the analysis and reduction of a detailed 53-species methane-air mechanism including nitrogen chemistry in a perfectly stirred reactor (PSR). The analysis of the mechanism for a PSR operating at an equivalence ratio φ = 0.5, inlet temperature Tin = 400°C and pressu…
Polycrystalline ${\mathrm{La}}_{0.5}{\mathrm{Sr}}_{0.5}{\mathrm{MnO}}_{3\ensuremath{-}\ensuremath{\delta}}$ thin films deposited on quartz wafers at 680 \ifmmode^\circ\else\textdegree\fi{}C and various oxygen pressures P by pulsed laser deposition are prepared. The effects of oxygen nonstoichiometry on the microstruct…
Soluble zinc salts added to cement mix water are generally agreed to retard hydration. The role of zinc in clinker is, however, less well-established. Experiments are reported on clinker stimulants and real industrial clinker meals, the latter doped with 1·5 wt% ZnO. Contrary to findings in the literature, relatively…
The kinetics and mechanism of analcime formation from precursor Na-clinoptilolite (Cpt-Na) and Na-mordenite (Mor-Na) were investigated from 125-225 °C, pressures up to 34.5 MPa, and pH = 9.2-10.7. By using batch and flow-through experimental methodologies, compositions of solids and solutions were monitored to track r…
The effect of side chain substitution on the 35 CI NQR and crystal structure of amides of the type N-(2,6-dichlorophenyl)-amides, 2,6-Cl 2 C 6 H 3 -NHCO-R (R = H or CH 3_y X y where X = CH 3 or CI and y = 0, 1, 2 or 3), has been studied by measuring the 35C1 NQR spectra and determining the crystal structures of the co…
The structural, electrical, and optical properties of crystalline Si codoped with Er and O by molecular beam epitaxy (MBE) have been investigated in detail. Si:Er:O layers (∼250 nm thick) have been grown by MBE, realizing uniform dopant concentrations in the range 8×1018–1.5×1020 cm−3 for Er and up to 5×1020 cm−3 for…
Mesoporosity combined with organic polymer functionality and hydrophobicity could give rise to promising new materials with applications in host–guest chemistry and biosensor devices. The synthesis of polymer–silica hybrid mesoporous materials with pore sizes of 3–6 nm is described, in which materials with large speci…
Two diastereomeric carboxylic acids, 2(S)-[2(R)-methylhexyloxy]propionic acid and 2(S)[2(S)-methylhexyloxy]propionic acid, were prepared from ethyl (S)-lactate and (R)-1-iodo2-methylhexane or (S)-1-iodo-2-methylhexane in the presence of Ag2O. From these acids two liquid crystals, 2 and 3, whose configurations are (S,…
Abstract Two series of pillared clays were prepared from a purified montmorillonite (95%) from La Serrata of Nijar, Spain, and polycations of Al and Zr using various methods. The effect of both the pillaring cation and the procedure of preparation on the physicochemical characteristics of the resulting materials was s…