Invited article Liquid crystal templating of porous materials
(1999). Invited article Liquid crystal templating of porous materials. Liquid Crystals: Vol. 26, No. 3, pp. 305-339.
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On the growth of decagonal Al-Ni-Co quasicrystals from the ternary melt
High-quality, single-Frain samples of decagonal Al-Ni-Co quasicrystals with volumes of up to 0.8 cm3 and an approximate composition of Al72Ni11 Co17 have been grown from the ternary melt. The precise growth methods and conditions are discussed in detail. X-ray diffraction patterns of crushed single grains and of singl…
Evaluation of Ceria Electrolytes in Solid Oxide Fuel Cells Electric Power Generation
Samaria‐doped ceria solid oxide fuel cells (SOFC) single cells have demonstrated power densities > 250 mW / cm 2 at 700°C and stable performance for 15,000 h. Though encouraging, issues of stack performance and efficiency due to mixed conduction remain. Stacks operated on H 2 / 3 % H 2 O show approximately half the po…
Light-Induced Surface Sliding of the Nematic Director in Liquid Crystals
We report the effect of light-induced sliding of the nematic director over an isotropic boundary surface in an azo-dye doped liquid-crystal cell. We show that illumination of the cell with polarized laser light induces transient dynamic sliding followed by permanent reorientation of the director. The two effects are i…
Energy Transfer in Molecular Dyads Comprising Metalloporphyrin and Ruthenium(II) Tris(2,2‘-bipyridyl) Terminals. Competition between Internal Conversion and Energy Transfer in the Upper Excited Singlet State of the Porphyrin
The photophysical properties of a tripartite supermolecule comprising zinc porphyrin and ruthenium(II) tris(2,2‘-bipyridyl) terminals separated by a trans Pt II bis-σ-acetylide fragment bearing tri- n -butylphosphine residues have been recorded in solution. Thus, excitation into the ruthenium(II) tris(2,2‘-bipyridyl)…
Luminescence Characteristics of Y 2SiO5 : Tb Phosphor Particles Directly Prepared by the Spray Pyrolysis Method
Tb‐doped Y 2 SiO 5 phosphor particles were prepared directly by a continuous droplet‐to‐particle preparation process using an ultrasonic spray generator. The photoluminescence characteristics of as‐prepared and calcined particles were investigated. The particles of Y 2 SiO 5 prepared below 1100°C had poor crystallinit…
Low-temperature transition to a metallic state in(La0.5Pr0.5)0.7Ca0.3MnO3films
The electrical resistivity of epitaxial $({\mathrm{La}}_{0.5}{\mathrm{Pr}}_{0.5}{)}_{0.7}{\mathrm{Ca}}_{0.3}{\mathrm{MnO}}_{3}$ films deposited on single crystalline ${\mathrm{LaAlO}}_{3}$ substrates was studied at temperature and magnetic fields ranging from 4.2 to 300 K and from 0 to 3 T, respectively. On cooling fr…
Reduced Temperature Curing of Acetylenic Polyimides
The onset temperature for the curing reactions of phenylethynyl-terminated oligomers can be lowered by the addition of disulfides which dissociate to form thiyl radicals on heating. Studies using model compounds have shown that the products obtained from these reactions are structurally different from those obtained i…
Quantitative phase analysis of clay minerals by X-ray powder diffraction using artificial neural networks. I. Feasibility study with calculated powder patterns
Abstract An artificial neural network with back-propagation architecture has been applied to the problem of the quantitative analysis of simulated clay mixtures from synthetic X-ray diffraction (XRD) data. A ‘clay characterization function’ (CCF) has been devised that combines information from two clay XRD peaks into…
Surface Distribution of Stress State and Diamond Phases in [100] Oriented Diamond Films
Stress distribution and diamond phases in polycrystalline diamond film have been investigated by micro-Raman spectroscopy. Intensity, lineshape and peak position of the diamond Raman line largely change on the film surface, particularly if grain center and grain boundary regions are compared. Whereas in the center of…
PVC‐Based TPEs for year 2000 and beyond
Abstract Soft, low‐compression‐set and chemically resistant TPEs have been developed from advanced PVC blend technology. These blends have low‐temperature flexibility comparable to that of commonly used TPEs and can be made flame‐retardant. These new TPEs are suitable for applications in consumer products, automotive,…
Environmental protection by utilization of the slag from magnesium production in building materials
This paper presents the results of research on the utilization of slag produced as the waste material of metallic magnesium production. This material is a fine powder with a high magnesium content. The characterization of slag was performed by XRD, DTA and TG analysis. Chemical composition and mechanical properties of…
Mechanisms of graphite formation in ductile cast iron containing cerium and lanthanum
In the present investigation the separate and combined effects of cerium and lanthanum on the graphite formation in ductile cast iron have been investigated, using directional solidification. It is shown that both elements are carbide formers in that they increase the undercooling for graphite formation. The observed…
Ecological aspects of polymer flame retardation
Abstract The practical application of commercial polymer flame retardants can no longer meet present requirements in terms of effectiveness or hazard. The most effective flame retardants used thus far have been halogen‐, phosphorus‐, antimony‐, and heavy‐metal‐based compounds, which, however, have the most environment…
Full‐color reflective display device using holographically fabricated polymer‐dispersed liquid crystal (HPDLC)
Abstract— A method of controlling the color of a holographic polymer‐dispersed liquid‐crystal (HPDLC) reflective display device has been achieved. By merely controlling the optical setup during fabrication, without changing the materials or laser light source, three primary‐color devices were fabricated. Since the col…
Flame-Retarding Properties of a New Phosphorus- Containing Monomer Used as Hardener in an Epoxy System
Abstract A new ortho-hydroxy-aryl-phosphonate additive was used to improve the flame resistance of an epoxy/anhydride system. Thermal, rheological, L.O.l. and SEM experiments were carried out to show that the P-additive acts not only as a flame retardant but also as a curing agent.
Thermal stability of poly(methyl methacrylate‐co‐butyl acrylate) and poly(styrene‐co‐butyl acrylate) polymers
Abstract Thermal stability of poly(methyl methacrylate‐co‐butyl acrylate) and poly(styrene‐co‐butyl acrylate) modified with a small amount of acrylic acid and/or N‐methylolacrylamide as a crosslinking agent was studied in this work. Programmed thermogravimetric analysis has been used to study the effect of copolymer c…
Nanostructure and atomic ordering in vanadium carbide
Nanostructured nonstoichiometric vanadium carbide VC 0.87 was obtained in powdered form using the ordering effect. The composition, structure, and properties of the carbide were studied by chemical and thermogravimetric analysis, gas chromatography, x-ray diffraction, optical and electronic microscopy, electron-positr…
A Practical Integrated Approach to Supramolecular Chemistry. I. Equilibria in Inclusion Phenomena.
We have designed two integrated experiments to serve as an introduction to the study of inclusion phenomena. The first one allows measurement, by UV-Vis spectrophotometry, of the equilibrium constant of the formation of the inclusion complex of an azo-dye (guest molecule) in an a-cyclodextrin (host molecule). In the s…
NMR observation of the conformations and motions of polymers confined to the narrow channels of their inclusion compounds
Abstract When polymers are guests in crystalline inclusion compounds (ICs) formed with small‐molecule hosts, they occupy a unique environment. In a cocrystallization process the small‐molecule host forms a crystalline lattice containing long narrow channels where the guest polymer chains are included. Because of the n…