Materials Literature
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Abstract Mesophases are briefly summarized and defined on a uniform basis, making use of order and mobility parameters. A schematic one‐component phase diagram is then reviewed that includes equilibrium as well as nonequilibrium phases. Assuming only five condensed phases (crystal, melt, glass, mesophase, and mesophas…
Mechanical properties of experimental nitrogen alloyed powder metallurgically produced duplex stainless steels were investigated. The microstructure of the studied powder metallurgically (PM) fabricated and hot isostatically pressed (hipped) duplex stainless steels was homogeneous and isotropic. The proportions of aus…
Caesium titanium alum, CsTi(SO4)2⋅12H2O, is a β alum and exhibits a large trigonal field and a dynamic Jahn–Teller effect. Exact calculations of the linear 2T2⊗e Jahn–Teller coupling show that in the strict S6 site symmetry the ground multiplet consists of a Kramers doublet 2Γ6 with magnetic splitting factors g∥=1.1 a…
Abstract Various new partially fluorinated polymers on the basis of substituted N ‐phenylmaleimides are prepared by radical copolymerisation. Nearly alternating copolymers are produced with vinyl ethers and styrene derivatives. The copolymers show high stability against thermal degradation in comparison to conventiona…
Three different conversion coatings have been evaluated. One of these is an established chromate-phosphate treatment (BONDERITE 705) whilst the others are chromate-free (BONDERITE 777 and EP2472) and not widely used for adhesive bonding. In the present study, the degree of surface modification introduced by these trea…
Abstract Five kinds of poly(aryl ether ketone)s (PAEKs) having para‐substituted linear molecular chains were synthesized via nucleophilic substitution reaction of the corresponding difluoro‐ and dihydroxy‐compounds. The glass transition temperature and melting temperature of the PAEKs measured through differential sca…
Other| February 01, 1997 Twinning in synthetic anorthite: A transmission electron microscopy investigation Huifang Xu; Huifang Xu Arizona State University, Department of Geology, Tempe, AZ, United States Search for other works by this author on: GSW Google Scholar Peter R. Buseck; Peter R. Buseck Search for other work…
A Born–von Karman rigid-ion lattice-dynamical model, using empirical atomic charges and valence force fields derived from the best fit to the vibrational frequencies of a group of silicates and oxides, has been applied to andalusite, kyanite and sillimanite, the three naturally occurring Al 2 OSiO 4 polymorphs. For an…
Hexa- n -alkylcyclotrisiloxanes with side chains ranging from butyl up to decyl were polymerized anionically with cryptated lithium as the counterion. The polymerizations usually yielded polymers with low polydispersity, demonstrating the presence of a single growing species and the successful breaking up of aggregate…
A novel in - situ phosphating coating system is developed by predispersing an optimum amount of phosphatizing reagents into the paint formulation. Five possible in - situ phosphatizing reagents are used in the formulation of a model solvent-borne polyester−melamine enamel paint system. The new formulation is then coat…
Abstract We report about the crystal structure of Cu 12 P 20 Br 10 , a polyphosphide containing the new polyanionic phosphorus polymer [unk][P 20 2− ]. It crystallizes in the triclinic system, space group P [unk] (No. 2) with a = 9.886(2) Å, b = 13.190(2) Å, c = 14.763 (3) Å, α = 70.83(1)°, α = 82.68(1)°, γ = 80.13(1)…
A new Rietveld refinement of previously reported powder neutron diffraction data on ND 4 ReO 4 taken over a wide range of temperatures [Powell, Brown, Harnden & Reid (1993). Acta Cryst . B 49 , 463–468] is reported. Rigid-body constraints are applied to the cation geometry and occupation of a second cation orienta…
The P-type ATPases (e.g., Na+-K+-ATPase and Ca2+-ATPase) occur widely in living cells of fungi, Protozoa, plants, and animals. These ion pumps show a high degree of divergence in their primary structures but share a limited number of common amino acid residues for their ATP-catalytic function. Particularly, the amino…
The transformation of Ni/Al layered double hydroxides to Ni/Al 2 O 3 and Ni/NiAl 2 O 4 composites was studied via X-ray diffraction and electron microscopy. The Ni/Al layered double hydroxide powders, with Ni 2+:Al 3+ cation ratios varying from 0.5 to 3.3, were first synthesized by a coprecipitation route. The powders…
Abstract Different morphologies and phase transitions of ternary triblock copolymers with different block sequences (ABC and BAC) are discussed qualitatively. The interplay between interfacial energies and elastic energies of the different blocks leads to various morphologies and enhances or prevents mixing of differe…
Recent studies on proton transfer equilibria for many hydrogen bonded complexes are discussed. These studies employ various spectroscopic techniques as infrared, ultraviolet, 1H NMR, 13C NMR, 15N NMR and nuclear quadrupole resonance (NQR) spectroscopy. Special attention has been paid to Fourier transform infrared (FTI…
Chalcogenide-based switching materials have potential applications in power control and information storage. In this work, an approach has been suggested to design chalcogenide-based amorphous materials for threshold or memory switching characteristics. Using this guideline, glasses have been formed in a new chalcogen…
The influence of mixed anaerobic bacterial biofilms comprising Desulfovibrio vulgaris and Desulfovibrio desulfuricans and pure Vibrio alginolytics aerobic biofilms on cathodically protected AISI 304L stainless steel (SS) coupons was studied by means of epifluorescence microscopy, scanning electron microscopy (SEM) and…
The liquid crystal orientation on a poly(vinyl cinnamate) or poly(vinyl 4-methoxy-cinnamate) coated solid substrate exposed to linearly polarized UV light has been studied. The angular distribution of the polymer side chains and the photoreaction products was derived as a function of exposure time using a simple assum…
Cadmium titanate, CdTiO3, was prepared by the sol–gel technique in bulk and in thin film form. The thermal evolution of the gels and the phase changes were studied by thermo- gravimetric analysis (TGA), X-ray diffractometry (XRD) and Raman and energy-dispersive (EDS) spectroscopies. The morphology of the samples was o…