Materials Literature
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Beta-C3N4 crystalline films have been grown on Si(100) substrates by reactive atom vapour deposition. The lattice parameters of the β-C3N4 crystalline phase, determined by x-ray diffraction and transmission electron diffraction, respectively, are both in good agreement with the theoretically predicted β-C3N4 structure…
It is now a well recognized fact that the jet from a shaped charge can be overdriven in the sense that the fastest moving particles are not produced as a cohesive mass of material. Rather, the tip material may be produced as a number of discrete particles which possess different nonzero radial components of velocity a…
We demonstrated that the bending electrostriction in polyurethane films is controlled by the ions contained as contaminants or additives. The sample film used in this investigation was composed of a segmented polyester-polyurethane and was coated with a thin gold electrode on each surface by ion-sputtering. Although t…
Organic electroluminescent devices that emit polarized light will be useful as backlights in conventional liquid-crystal displays. The necessary high polarization ratios require, in turn, highly aligned emitters. The various methods of orientation are discussed, together with the materials to which they are applicable…
Abstract In this paper, we report the preparation and characterization of composites of polypyrrole (PPy) with polyvinylidene fluoride (PVDF), and cellulose. We used the techniques of chemical and electrochemical polymerization. These materials were characterized using X‐ray diffraction (wide and small angle (SAXS)),…
A series of liquid crystalline terphenyls with three strategically located fluoro substituents has been synthesised and evaluated for a range of physical properties. Low temperature metallations were used to prepared arylboronic acids which were employed in selective palladium-catalysed cross-coupling reactions to gen…
The latest release of the Inorganic Crystal Structure Database contains a total of 87 entries corresponding to 70 different materials in point group 4. The structures reported for 11 materials in space group P4 satisfy the criteria for ferroelectricity, as do four in P4(1), one each in P4(2) and P4(3), 12 in I4, inclu…
Six charge-transfer (CT) complexes containing three different octamethylferrocene derivatives (Fe(η 5 -C 5 Me 4 SMe) 2, 1; Fe(η 5 -C 5 Me 4 S t Bu) 2, 2; Fe(η 5 -C 5 Me 4 S) 2 S, 3 ) and TCNQ or TCNQF 4, respectively ( 4 − 9 ), have been prepared and fully characterized. X-ray crystal structural studies of 4, 5, 7, an…
Abstract Loparite-(Ce) is a ubiquitous accessory mineral in modally diverse albite-rich metasomatic rocks of the Burpala alkaline complex, Siberia. Compositionally, the mineral approaches the ideal formula Na REE Ti 2 O 6 ( REE = Ce > La > Nd > Pr > Sm), and contains minor CaTiO 3 (<4.8 mol.%), SrTiO 3…
The effect of minor alloying in a super ferritic stainless steel 26% Cr-3% Mo matrix was investigated. The corrosion resistance of several experimental heats was examined in terms of their sensitization and intergranular corrosion (IGA) susceptibility following a low-temperature anneal (620°C). Constant potential etch…
Abstract The mechanisms of photooxidation of several polyether based polymers were compared in order to give general rules of orientation of the oxidative reactions. These polymers were a poly(ether‐ester) and two poly(ether‐urethane)s. The behavior of the polyether component as homopolymer was also studied. This stud…
The tensile behaviour of the ferrite and austenite phases of Fe–22Cr–5Ni (wt-%) duplex stainless steel containing a maximum of 17·2% austenite was investigated in the temperature range 65–298 K. The results indicate that mechanical twinning occurred in the testing temperature range, and that austenite impeded the grow…
The final structure of a braid is a consequence of force interactions among yarns in the convergent zone. In Part 1, the influence of friction forces on the final braided structure was discussed via kinematic analysis. A transformation from a 3-D cone to a 2-D plane was made for the mechanics analysis. A mechanics mod…
Abstract A systematic design procedure of the prepolymerization stage of a polycondensation process is presented. This procedure treats polycondensation processes as reactive separation processes and offers an alternative to design through simulations. Feasible flowsheets and operating conditions are developed by anal…
A low threshold acoustic cavitation regime was observed for the excitation of hypersonic waves due to a stimulated Brillouin scattering (SBS) mechanism, when the optical pump lies within the uv frequency range. Cavitation occurs if the optical pump bandwidth Delta(+)>>Omega(0), where Omega(0) is the Stokes frequency s…
Abstract 20π Antiaromatic isophlorins of N21,N22-bridged N23-alkyl-porphyrins were prepared through photoreduction with N-benzyl-1,4dihydronicotinamide or intramolecular nucleophilic alkylation at the N(24)-position. The ring structure of these N21,N22-bridged isophlorins is not highly deviated from planarity and thei…
A simple and efficient method for the synthesis of lactose-based homopolymers from N -lactosyl- N ‘ -(4-vinylbenzyl)urea or N ‘ -lactosyl- N,N -methyl(4-vinylbenzyl)urea ( 5a, 5b ) is described. Free radical polymerization of these new urea monomers proceeded smoothly in an aqueous solution using potassium persulfate…
A series of chiral bimesogenic compounds has been synthesized. The molecules comprise beta-estradiol as the central chiral unit, which is attached to a terminal 4'-cyanobiphenyl-4-yl group at C-17 by an alkanoate spacer containing 5, 6 or 11 carbon atoms. At C-3 the estradiol moiety is substituted with an omega-alkeny…
Abstract This work describes the investigation of plastic strain in tensile deformed polycrystalline copper using the automated Electron BackScatter Pattern (EBSP) technique of electron diffraction in the Scanning Electron Microscope (SEM). A strong correlation was found between the known accumulated plastic strain in…
In this paper, we present a rapid manufacturing process for the layered fabrication of polymer-based composite parts using short discontinuous fibers as reinforcements. This process uses a UV-laser-based system for the selective solidification of the composite liquid. The primary components of the prototype are: (1) f…