Materials Literature
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An attempt has been made to obtain strongly cube-textured sheet steels with fine grains employing oxide-separator-induced decarburization. The steels of the chemical compositions around Fe–3%Si–1%Mn–0.05%C were hot-rolled, twice cold-rolled with in-between annealing into 0.35 mm thickness and then subjected to the lam…
A novel photochromic multilayer film containing polyoxometalates has been fabricated using layer-by-layer self-assembly.
Superparamagnetic as well as fine ferrimagnetic particles such as Fe3O4, have been extensively used in magnetic field induced localized hyperthermia for the treatment of cancer. The magnetic materials with Curie temperature (Tc) between 42 and 50 degrees C, with sufficient biocompatibility are the best candidates for…
The shear problem for nematic polymers consists in characterizing all stable stationary orientational distributions, steady and unsteady, versus shear rate and material parameters. Continuum theory [cf. Leslie (1968), Ericksen (1960)] provides formulas for the shear response of liquid crystals in terms of a single vis…
One-bond Pt-Pt nuclear spin-spin coupling constants J(Pt-Pt) for closely related dinuclear Pt complexes can differ by an order of magnitude without any obvious correlation with Pt-Pt distances. As representative examples, the spin-spin couplings of the dinuclear Pt(I) complexes [Pt(2)(CO)(6)](2+) (1) and [Pt(2)(CO)(2)…
The synthesis of 2-(4-phenyl)-6-anthracenes and 4,4′-bisphenyl-2,6-anthracenes, disubstituted by saturated (decyloxy) or unsaturated ((Z)-dec-4-enyloxy) chains, is reported. All the materials are liquid crystals and exhibit smectic A and/or C phases. As compared to the saturated chains, the unsaturated ones provide a…
The Manufacturing Advisory Service (MAS) is a concept level manufacturing process and material selection tool, geared toward educating designers in basic process capabilities and informing experienced designers about new technologies. The designer enters a dialogue with the MAS, answering questions about production qu…
The liquid crystalline properties of two series of nonsymmetric dimesogenic compounds consisting of cholesterol and Schiff base, azobenzene or stilbene mesogens interlinked by a pentamethylene spacer are compared. Compounds in the first series bear the fluorinated OCH2(CF2)6CF3 tail, whereas those in the second series…
Back corona on a powder layer deposited via the electrostatic powder-coating process using corona guns has a strong influence on the corrosion resistance and appearance of cured powder films. The presence of the back corona is often evidenced by orange peel, micro-dents, and pinholes on the film surface. The surface r…
We report simulations demonstrating subwavelength focusing of electromagnetic waves, from one homogeneous and isotropic dielectric to another, through a flat lens made of a realizable negative-refractive-index (NRI) metamaterial. The NRI metamaterial consists of a two-dimensional inductor/capacitor (L/C) loaded transm…
Silver sulfide particles of different size are synthesized in the cavities of zeolites A and ZK-4 by exposing the Ag+-exchanged dehydrated zeolites to H2S. The two smallest stable particles synthesized by this method are the Ag2S molecule and the Ag4S2 cluster. Both show photoluminescence in the visible region. The lu…
Biological cells have been imaged using liquid crystals as an optical amplification medium. Preferential orientation of the liquid-crystal molecules at the surfaces of cells immobilized on substrates leads to well-resolved images, with very sharp contrast compared to images observed by standard phase-contrast microsco…
Spectroscopic, redox, and photochemical behavior of a self-assembled donor-acceptor triad formed by axial coordination of zinc meso-tetraphenylporphyrin, Zn ( TPP ) with fulleropyrrolidine bearing two pyridine moieties ( C 60 ( Py ) 2 ) was investigated. The UV-visible and 1 H NMR spectral studies revealed supramolecu…
Protective effectiveness of electronic conducting polymers such as polyaniline and polypyrrole (PPy) are attributed to their high oxidation-reduction potential that allows maintaining the passive state of the substrate metal. However, when the polymer layer is damaged by a scratch or a hole, the protective actions of…
Alignment techniques for calamitic liquid crystals are well developed and play a crucial role in liquid crystal devices. Comparatively little attention has been paid to the alignment of discotic liquid crystals. Only recently the integration of discotic liquid crystals into optical and electronic devices stimulated th…
Photochromic 3,3-diphenyl-3H-naphtho[2,1-b]pyran molecules were embedded in sol–gel prepared thin organically modified silica films. The introduction of organic functional groups into a silica matrix allows the surfaces of its pores to be tailored and thus the polarity of the pores to be modified. The photochromic pro…
This article gives a topical review of the dynamic behavior of surface species on two representative metal oxide surfaces of TiO2 (110) and CeO2(111) investigated by scanning tunneling microscopy (STM) and noncontact atomic force microscopy (NC-AFM). In addition, two new aspects, the self-limiting growth of Pt nanopar…
Nowadays, the high-temperature plasticity of yttria-stabilized tetragonal zirconia polycrystals (YTZPs) is successfully explained in terms of a threshold stress. Despite the fact that its existence is very well proved experimentally, the origin and nature of the threshold stress are still unexplained. This work develo…
(C5Me5)2Yb x OEt2 reacts with terpyridine and tetrapyridinylpyrazine to afford new mixed-valent systems.
The defect chemistry of Mg-doped BaTiO3 has been quantitatively studied. BaTi1−xMgxO3−x samples (x = 0, 0.001, 0.005, 0.01, 0.012, 0.02) have been precisely synthesized by the Pechini method. The concentration of oxygen vacancies was estimated from the location of the oxygen partial pressure P°(O2) at which the minimu…