Materials Literature
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Abstract A unique way to dramatically enhance the brightness of single layer and stacked reflective cholesteric LCDs is shown. The LC aligning surfaces are treated to provide varying degrees of homogeneity while maintaining the bistability. The result is reflective displays with exceptionally high brightness approachi…
FERROELECTRIC LIQUID CRYSTALS -FLCs. A SYNTHETIC APPROACH. Synthetic methods used for the synthesis of the Ferroelectric Liquid Crystals (FLCs) will be considered with emphasis on the chiral synthesis methodologies and mesomorphic electrooptical properties.
The mechanical properties, namely, tensile modulus, maximum stress in tension and elongation at maximum stress of thermally point-bonded nonwoven fabrics with different bonding temperature have been evaluated. Image acquisition and analysis techniques have been used to quantify structural parameters such as fiber orie…
The companion article by Mark Allendorf highlights the importance of on-line CVD coating for flat glass manufacture. Two smaller, but fast growing, markets are those of precision optics and telecommunications. Both these markets are driven by the rapidly developing requirement for high throughputs. Current deposition…
Abstract This paper reports two related studies of the Form II → Form I crystal‐crystal transformation in isotactic polybutene‐1. First, it was found that in melt spun filaments, the rate of transformation is higher in filaments possessing higher levels of crystalline orientation. Second, we consider the occurrence of…
Barium ferrites are usually produced by the ceramic method. On the other hand, very fine particles with high chemical homogeneity can be obtained by wet methods, such as co-precipitation. In this work, barium ferrite powders were obtained by co-precipitation. The effects of Fe/Ba molar ratio, reagent addition order, p…
Abstract The matrix of the Pliocene volcaniclastics from the Akrotiri area of the Santorini island (Greece) is dominated by clinoptilolite. Smectite, occasionally illite-smectite, opal-CT, cristobalite and mordenite are also present. The clinoptilolite-rich samples were heated at 460 and 560°C for 12 h and the reducti…
We report the structural characteristics of a high-quality stable decagonal quasicrystal (D phase) with 1.6nm periodicity, formed in Al75Ni15Ru10 alloy annealed at 890°C for 24h. The tiling structure and the arrangement of transition-metal atoms (Ru and Ni) in this Al-Ni-Ru D phase have been clearly revealed by high-r…
Finite-size effects in Bi lines of cross section 3 μm×w, where w=8–120 μm, have been studied. The lines were made by optical lithography followed by electrodeposition. At T=5 K, the magnetoresistance (MR) decreases monotonically with decreasing line width of the Bi films, from 44 000% at w=120 μm to 4000% at w=8 μm in…
Tetracarboxylic dianhydrides bearing a polyalicyclic structure, bicyclo[2.2.1]-heptane-2,3,5,6-tetracarboxylic 2,3:5,6-dianhydrides (BHDA), bicyclo[2.2.2]-octane-2,3,5,6-tetracarboxylic 2,3:5,6-dianhydrides (BODA), (4arH,8acH)decahydro-1t,4t:5c,8c-dimethanonaphthalene-2,3,6,7-tetracarboxylic 2,3:6,7-dianhydrides (DNDA…
Two impact modifiers, based respectively on polybutadiene (PB) and poly(butyl acrylate-co-styrene) (PBA), are compared in blends with four glassy polymers: polycarbonate (PC), poly(methyl methacrylate) (PMMA), poly(styrene-co-acrylonitrile) (PSAN), and poly(vinyl chloride) (PVC). Dynamic mechanical tests show glass tr…
dc magnetization measurements, for zero-field cooled (MZFC) and field-cooled (MFC) cases, have been carried out for flash-evaporated Pd-doped NiMn thin films. These included reentrant phases (Ni76−xPdx)Mn24, for 0⩽x⩽5, and Ni75Mn23Pd2, a pure spinglass phase. The studies were performed over the temperature range 3–300…
The crystal structure of schwartzembergite from the San Rafael mine, Sierra Gorda, Chile, tetragonal, a 3.977(1), c 12.566(4) A, I 4/ mmm , has been refined to an R index of 1.8% based on 103 unique observed ( I > 5σ I ) reflections. Schwartzembergite is optically biaxial, but long-exposure precession photographs show…
The synthesis of Bisphenol A polycarbonate (PC) via melt transesterification of diphenyl carbonate and Bisphenol A in the presence of different catalysts was studied in a batch reactor. Low catalytic activity of dibutyltin oxide (Bu2SnO) did not allow high molecular weight PC to be obtained for an appropriate reaction…
It is well‐known that clean room textiles are acting as a barrier protecting humans against the surrounding atmosphere or vice versa. These textiles are produced in the limited range of porosity and the air permeability. The porosity calculated from fabric geometry and the air permeability of two typical clean room te…
The synthesis and transition temperatures of a series of 5-(4-alkyl- and 4-alkoxy-phenyl)2-cyanobenzo[b]furans and a 5-(4'-alkylbiphenyl-4-yl)-2-cyanobenzo[b]furan are presented. The 2-cyanobenzo[b]furans show similar mesophase types to the analogous biphenyl and terphenyl compounds, which are obtained by replacing th…
This paper treats the axisymmetric flo w driven by Marangoni convection and a Rotating Magnetic Field (RMF) in a Floating-Zone configuration. For a low Prandtl number liquid, and different Marangoni values, we investigate the evolution of the flo w as the intensity of the RMF is increased. It evolves from a Marangoni…
Research in materials today has progressed from materials exhibiting structural functionality to those exhibiting electronic functionality. The study of solid-state ionics ushers in a new era of chemically functional materials. This chemical functionality arises out of the defect equilibria of these materials, and res…
The crystal structures of fedorite from the type locality, the Turiy complex (Kola Peninsula, Russia) and the Little Murun complex (Sakha, Russia), have been refined from single crystals by CCD X-ray diffractometry. Both samples are triclinic, space group P¯1; fedorite from Turiy has a 9.6300(7), b 9.6392(7), c 12.611…
A variant of the maximum entropy method (MEM), recently developed by Vartiainen et al., is proposed for infrared reflectivity spectra analysis. The procedure uses a new interpolation algorithm to estimate the so-called error phase that is the key step of the model. As shown by several examples, this approach is a good…