Materials Literature
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The hysteresis behaviour of the nematic-cholesteric phase transition in liquid crystals is closely connected with the alignment of the liquid crystal molecules on the surfaces of treated solid substrates. We have investigated the hysteresis as a function of rubbing strength, using rubbing technology that controls the…
Abstract The effect of end conditions and testing procedures on the measured strength of 100- by 200-mm (4- by 8-in.) concrete cylinders were evaluated. Concretes representing three strength levels: 50, 75, and 120 MPa (7000, 11 000, and 17 000 psi) were prepared. Cylinder end conditions included grinding and capping…
It has been revealed that a concentrated chloroform solution of poly(2,5-dinonyloxy- p -phenylenevinylene) (NO-PPV) can be in a lyotropic liquid crystalline state at room temperature. The lyotropic NO-PPV solution exhibits redshift of optical absorption compared with the isotropic solution. X-ray diffraction analysis…
The decagonal phase in the Al-Co-Ni system transforms at lower temperatures into a crystalline approximate phase. Intermediate states between these equilibrium phases with complex domain structures are frozen in during experimental crystal preparation. The implications of the experimental difficulties in preserving we…
A simple and reliable method has been developed for the in situ LR White embedding of cell monolayers grown on glass cover-slips. Combined with cytochemical or immunological procedures, this technique allows light and/or electron microscopy investigations of a large number of cells in the same horizontal plane within…
Abstract Polyurethane adhesives containing the polyether backbone exhibit a good joint strength in cryogenic environments. In practice, many of the commercially available polyurethane adhesive systems contain free or chemically blocked isocyanates which have some limitations. This study presents the synthesis and char…
Complexes of the types R 3 Pb-Fe(CO) 2 Cp [R=Me (a). Et (1b), i Pr (lc), i Bu (Id)]. R 2 Pb[Fe(CO) 2 Cp] 2 [R=Me (2a), Et (2b)], i Pr 2 (Br)Pb-Fe(CO) 2 Cp (3c) and [R 2 PbFe(CO) 4 ] 2 [R=Me (4a), Et (4b). i Pr (4c)], as well as the spiro-complexes Pb[Fe(CO) 4 PbR 2 ] 2 [R = Me (5a). Et (5b). i Pr (5c)] and Pb[Fe(CO) 4…
Surface segregation in thin films of model symmetric polyolefin diblock copolymers exhibiting a lamellar morphology has been investigated. Films were spin coated on a variety of substrates and the resulting microstructure analyzed using neutron reflection, X-ray reflection, ellipsometry, light microscopy and secondary…
The mechanism and nature of radiation defects creating with electron and neutron irradiation in LTB crystals are discussed.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of the Tributyltin-Iron(III) Porphyrin Complex by a Free Radical ProcessByungho Song and Harold M. GoffCite this: Inorg. Chem. 1994, 33, 26, 5979–5980Publication Date (Print):December 1, 1994Publication History Published online1 May 2002Published inissue 1 December…
Effects of chromium (Cr) and molybdenum (Mo) on differences in corrosion behavior of ferritic and austenitic stainless steels (SS) were investigated to clarify the reason for the superior corrosion resistance of high-alloy ferritic SS to austenitic SS. In the region where the corrosion index (Cr + 3xMo [mass%]) exceed…
Abstract Explains the origins of the development of the handle method, and lists the three criteria for predicting fabric quality. Shows how fabric handle evaluation is used, for example, handle analysis expresses characteristics and quality. Goes on to explain hand value and total hand value with the aid of equations…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and X-ray Crystal Structure of a Novel Iron Nitrosyl Complex, Fe(NO)2PPh3(.eta.2-TCNE)Lijuan Li, Gary D. Enright, and Keith F. PrestonCite this: Organometallics 1994, 13, 12, 4686–4688Publication Date (Print):December 1, 1994Publication History Published online1 Ma…
Two novel dinuclear complexes of terbium(III) with 1,5-bis(1′-phenyl-3′-methyl-5′-pyrazolone-4′)-1,5-pentanedione (H2L), Tb2L3·6H2), Tb2L3·SDMF, have been synthesized. The crystal structure of Tb2L3 · 5DMF was determined by X-ray diffraction methods. Crystals are triclinic, space group P 1 with α = 16.957(5), b = 17.8…
High-pressure experiments on metallic thallium have been carried out using a diamond-anvil cell for pressures up to 32 GPa. A hexagonal close packed → face-centred cubic (f.c.c.) phase change takes place around 4 GPa. Fitting of the experimental data to the Murnaghan and Birch equations of state has been used to obtai…
Th e effect of silicon on the microstructure and solidification segregation of directionally solidified IN738 nickel-based superalloy was studied. Directional solidification at various solidification rates and partial directional solidification plus rapid quenching were applied. Metallographican alysis and an electron…
The gaseous alkali corrosion kinetics of Si 3 N 4 were systematically investigated from 950° to 1100°C in dry air containing 0.98 vol% sodium nitrate vapors. The linear reaction rates observed at all temperatures indicate that the alkali corrosion of Si 3 N 4 is interface‐controlled with an activation energy of 199 kJ…
Abstract The title organic charge transfer salt, where EP-TTP is 2-(4,5-ethylenedithio-1,3-dithiol-2-ylidene)-5(4,5-trimethylenedithio-1,3-dithiol-2-ylidene)-1,3,4,6-tetrathiapentalene, has so-called β-type donor arrangement, but the Fermi surface is basically one-dimensional. This salt exhibits metallic conductivity…
The nonlinear optical response of semiconductor interfaces using three-wave mixing experiments in general, and second harmonic generation (SHG) in particular, has been widely studied, but it is only recently, with the advent of commercial tunable pulsed laser sources, that the spectroscopic aspect of SHG can be more r…
Existing models for predicting end breakage rates in spinning give unrealistic values when considering the effects of changes in count or speed on the worsted ring frame. A new approach to predicting end breaks gives results that are closer to experience values. The most important factor in determining end breaks is y…