Materials Literature
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We present a model for alloys of compound semiconductors by introducing a one-dimensional binary random system where impurities are placed in one sublattice while host atoms lie on the other sublattice. The source of disorder is the stochastic fluctuation of the impurity energy from site to site. Although the system i…
In this paper, the synthesis, photo-reaction and photo-induced liquid crystal alignment of a polyimide with a pendant cinnamate group are reported. The polyimide was synthesized by the thermal imidization of the polyamic acid derived from 4,4'-(hexafluoro-isopropylidene)diphthalic anhydride and hydroxydiaminopropane,…
The micromagnetic properties of multilayered MnBi/Al films have been investigated and compared to pure MnBi thin films. Pure MnBi films reveal an anomalous increase of the high temperature coercivity, which has been explained on the basis of a hybrid domain wall pinning model. The multilayer-type preparation of MnBi/A…
We report a novel method of imaging micropatterned self-assembled monolayers (SAMs) using adsorbed films of thermotropic (smectic or nematic) mesophase which can then be studied by optical microscopy. Three alkylthiols, functionalized with CH3, OH and COOH groups, were used in various combinations to form patterned SA…
The microfibrillar morphological structure of aliphatic polyamide fibers has been consistently presented by the three phase microfibrillar model proposed by Prevoršek and not by the two phase microfibrillar model proposed by Peterlin. A widely spread opinion is that the 3-phase or “Swiss-cheese” model is applicable in…
Cellulose was dissolved in a solvent mixture containing N-methylmorpholine-N-oxide (NMMNO), diethylenetriamine (DETA) and water. The weight-average molar masses Mw, radii of gyration RG, and second virial coefficients A2 of 9 different cellulose samples were determined by means of static light scattering (SLS) at room…
A new polyalcohol is prepared by reduction of the perfectly alternating ethylene−carbon monoxide copolymer. The low melting temperature of this atactic material (137 °C) is attributed to the 1,4-arrangement of the hydroxyl side groups. The different orientations of these slightly bulky groups with respect to the molec…
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…