Materials Literature
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Two kinds of molecular reorientation processes in SSFLC cells were observed. One (a) is accompanied by the nucleation and growth of domains and the other (b) proceeds by uniform brightness change without any domain formation throughout a cell. In transmittance change, (a) and (b) are also explained by two-step and sin…
The selectivity of rhodium-based catalysts is very dependent on the choice of support or the promotors. Cerium oxide is very effective for ethanol promotion when added to Rh/SiO2 catalysts or used as support (70–80% ethanol selectivity). The role of the cerium oxide has been studied by various techniques, namely chemi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMorphological partitioning of ethyl branches in polyethylene by carbon-13 NMRE. Perez, D. L. VanderHart, Buckley Crist Jr., and P. R. HowardCite this: Macromolecules 1987, 20, 1, 78–87Publication Date (Print):January 1, 1987Publication History Published online1 May 2002Publi…
New complexes [MoO(O2)2L]2–[L = malate, tartrate (tart), tartronate, quinate, or glycolate (glyc)], [WO(O2)2L]2–(L = citrate, tartrate, malate, or glycolate), and [W2O2(O2)4(tart)]4– are reported, and modified preparations given for [MO(O2)2L]2– and [MO2(O2)L(H2O)]2–(M = Mo or W; L = oxalate). Raman and i.r. spectra o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnionic photocatalysts supported in layered double hydroxides: intercalation and photophysical properties of a ruthenium complex anion in synthetic hydrotalciteEmmanuel P. Giannelis, Daniel G. Nocera, and Thomas J. PinnavaiaCite this: Inorg. Chem. 1987, 26, 1, 203–205Publica…
Evidence is provided which proves that the emeraldine base form of polyaniline is ‘doped’ by protonic acids to the metallic conducting regime by a process involving neither oxidation nor reduction of the polymer, thus introducing a new concept of doping to the conducting polymer field.
The friction and wear properties of hard carbon films deposited by a hot cathode glow discharge in ethylene or methane were examined by using a reciprocating tribometer in vacuum and in air. A hard carbon film composed of mixed diamond and graphite crystal shows high friction in vacuum. On the other hand, hard carbon…
The human body is a mildly corrosive environment with a certain salt level and a low oxygen content. High corrosion resistance is demanded for implants to obtain biocompatibility and because even minor corrosive attack and low failure frequency are unacceptable. Degradation processes of the commonly used implant mater…
The variables influencing the rate of the cathodic delamination of polybutadiene from steel in alkali halide solutions are discussed. The bond at the interface arises from the reaction of carboxyl groups in the polybutadiene with hydroxyl groups on the surface of the iron oxide at the interface. It is this bond that i…
In this second part, the mechanical behaviour of elemental semiconductors (ESC) and III-V compounds (CSC) is briefly reviewed. The marked temperature dependence of the stress-strain curve is recalled first and some attention is paid to the correlation between the lower yield stress and dislocation dynamics at moderate…
Thermal cycling effects in an aged Ni-rich Ti–Ni shape memory alloy have been examined by means of differential scanning calorimetry (DSC) and transmission electron microscopy (TEM), changing aging temperature and time, temperature range for thermal cycling, and the number of thermal cycles up to 104 times. Two kinds…
Cationic complexes of the type [Fe(LNN)3]2+ and [Fe(LNNN)2]2+ have been isolated as Cl–, ClO4–, or BF4– salts, where LNN and LNNN represent bidentate and tridentate nitrogen-donor ligands respectively. The bidentate ligands were 2-(2′-pyridyl) benzimidazole (pybtim), 2-(2′-pyridyl)-N-methylbenzimidazole (mpybzim); 2-(…
Structural work on KH2PO4, KD2PO4, RbH2PO4 and partially-deuterated CsH2AsO4 and RbH2PO4 over the period 1970 to 1985, is fully reviewed. The content is predominantly the Edinburgh-based programme of neutron-diffraction studies, but other X-ray and neutron-diffraction work on these isomorphs is also included. Followin…
Texture is the orientation distribution of crystallites in polycrystalline materials. Since most of the physical properties of crystals are anisotropic, their macroscopic mean values are mainly controlled by the texture. Hence, property control of technological materials requires texture control. Textures are being fo…
When the picrosirius red technique was applied to cardiac muscle sections, intense yellow myocyte staining sometimes obscured thin collagenous septa. The picrosirius red technique was modified to include treatment of the sections in 0.2% (w/v) aqueous phosphomolybdic acid prior to staining. With 1-5 min treatment, cyt…
Neutron spin echo measurements have been performed on the mixed ionic system Ca 0.4 K 0.6 (NO 3 ) 1.4 around the glass transition temperature T g in order to determine the time dependence of the density-density correlation function ϕ q ( t ). This quantity plays a central role in recent mode-coupling theories of the g…
Summary Sulphate-hydrocarbon redox-reactions occur at two specific diagenetic temperature/thermal maturity levels: less than about 75–85°C (0.2–0.3% R 0 ), and more than 100–140°C (> 1.5% R 0 ), respectively. In low-temperature/maturity environments these redox reactions take place only with the mediation of bacter…
(1987). The Biochemistry of Degradation of Polyethers. Critical Reviews in Biotechnology: Vol. 6, No. 3, pp. 273-307.
Four emission bands have been studied at low temperatures with differently doped ZnO crystals. In the ${\mathrm{Co}}^{2+}$(${\mathrm{d}}^{7}$) ion, two transitions to the $^{4}\mathrm{A}_{2}$(F) ground state give rise to new luminescence bands, viz., starting from the $^{4}\mathrm{T}_{2}$(F) term (around 3600 ${\mathr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStereoselective addition reaction of diethylzinc to aldehydes, catalyzed by cinchona alkaloidsA. A. Smaardijk and Hans WynbergCite this: J. Org. Chem. 1987, 52, 1, 135–137Publication Date (Print):January 1, 1987Publication History Published online1 May 2002Published inissue…