Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure and order parameter of a nematic lyotropic liquid crystal studied by FTIR spectroscopyY. W. Hui and M. M. LabesCite this: J. Phys. Chem. 1986, 90, 17, 4064–4067Publication Date (Print):August 1, 1986Publication History Published online1 May 2002Published inissue 1…
Abstract The reflectivity of single crystals of BaFCl is measured in the wave number range from 30 to 5000 cm −1 at room temperature using a Fourier transform infrared spectrometer. The recorded reflection spectra are evaluated by means of the classical oscillator model and the Kramers Kronig analysis in order to get…
Motivated by the recent work of Santos Lemus and Hirsch and of Pai, Yanus and Stolka on the concentration dependence of hole transport in selected molecularly doped polymers, a Monte Carlo computer study has been conducted. It predicts that transport should in principle exhibit percolative features without, however, s…
The interactions between Au and Cu across a Ni barrier layer have been studied using a wide range of Ni thickness. Above 300 °C, extensive interdiffusion between Au and Cu has been observed, with little involvement of the Ni layer. The interdiffusion between Au and Cu results in a nearly continuous change and uniform…
This paper summarizes work done to determine the minimum seam strengths re quired for clothing, in particular, Canadian Forces (CF) combat clothing, and to re- validate a recommended 80% seam efficiency. It describes a method to determine where maximum stresses occur in clothing, the locations of these stresses in wea…
The energies of defect clusters In Mn 1–x O, Fe 1–x O. Co 1–x O, and Ni 1–x ,O have been calculated using molecular orbited theory. The results indicate that (i) relatively large extended defects of a zinc blende type coordination are stable in MnO and FeO, (ii) only small defects are stable in CoO, and (iii) no defec…
Abstract Oxygen isotope ratios of <0.1- μ m smectite in bottom sediments of the Mississippi River and the Gulf of Mexico near the mouth of the river have been determined to investigate diagenesis of land-derived clay minerals during sedimentation in the sea. No difference was detected in δ 18 O (SMOW) between the r…
Abstract The refinement of the structures of rhombohedral (NH 4 ) 4 CdCl 6 , K 4 CdCl 6 , and Rb 4 CdCl 6 (K 4 CdCl 6 ‐type) and of tetragonal In 4 CdI 6 and Tl 4 CdI 6 (Tl 4 HgBr 6 ‐type) using single crystal data is reported. The discussion of the crystal chemistry of these compounds furnishes new structural relatio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigher coordinate complexes. 23. Reductive coupling of isocyanide ligands in seven-coordinate molybdenum(II) mixed isocyanide bipyridine complexesSteve. Warner and Stephen J. LippardCite this: Organometallics 1986, 5, 8, 1716–1725Publication Date (Print):August 1, 1986Public…
A procedure is described for a detailed characterization of multilayer analyzers that can be effectively applied to their design, optimization, and application for absolute x-ray spectrometry in the 100 to 10,000 eV photon energy region. An accurate analytical model has been developed that is based upon a simple modif…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT([2.2]Paracyclophane)gallium(I) tetrabromogallate(III): its synthesis and novel structural featuresHubert. Schmidbaur, Wolfgang. Bublak, Brigitte. Huber, and Gerhard. MuellerCite this: Organometallics 1986, 5, 8, 1647–1651Publication Date (Print):August 1, 1986Publication Hi…
Abstract The effect of alumina admixtures on the ionic conductivity of TlCl is studied. In agreement with the model of “Heterogeneous Doping” a change of the intrinsic anionic conduction (Cl ‐vacancies) into a Tl + ‐conduction (Tl + ‐vacancies) is induced at lower temperatures (≦ 300 K). The experimental conductivity…
We report detailed optical absorption spectra for Mn2+ in CaF2. The spectra from unirradiated samples, reported here for the first time, enable the 495-nm luminescence emission to be clearly assigned to a transition from the first excited 4T1g (4G) level to the 6A1g (6S) ground state. On the basis of the absorption cu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUpper excited-state emission of a covalently linked porphyrin dimerYoukoh Kaizu, Hideaki Maekawa, and Hiroshi KobayashiCite this: J. Phys. Chem. 1986, 90, 18, 4234–4238Publication Date (Print):August 1, 1986Publication History Published online1 May 2002Published inissue 1 Au…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and structural characterization of the [H6-nNi34(CO)38C4]n- (n = 6,5) and [Ni35(CO)39C4]6- clusters: molecular models for carbidized metal crystallitesAlessandro. Ceriotti, Anna. Fait, Giuliano. Longoni, Giampietro. Piro, Luigi. Resconi, Francesco. Demartin, Mario.…
Using a small-angle x-ray scattering technique, we have determined the sizes of side chain mesomorphic polymers diluted in a low-molecular-weight liquid crystal, respectively, parallel ( R ∥ ) and perpendicular ( R ⊥ ) to the director of the nematic medium ( n 0 ). We found a significant difference between the two val…
Abstract Differences in the temperature and pressure dependences of the relaxation times of a slow diffusional process and the α structural relaxation pose an interesting problem. This feature, observed by dynamic light scattering in amorphous poly(phenylmethyl siloxane), is related to another basic feature of lack of…
Abstract This paper presents new experimental data on the viscosity of ferrite‐filled polymers at high levels of loading. The choice of matrix and the choice of filler and filler loading has direct relevance to commercially important systems of magnetic plastics and rubbers. The effect of shear rate, concentration, an…
Abstract The heat capacity at constant pressure of liquid PEEK, poly(oxy‐1,4‐phenylene‐oxy‐1,4‐phenylene‐carbonyl‐1,4‐phenylene), has been measured by scanning calorimetry from 420 to 680 K, and that of PC, poly(4,4′‐isopropylidenediphenylene carbonate), from 325 to 610 K. These new data were combined with data‐bank d…
Auger electron spectroscopy and low‐energy ion scattering were used to assess surface composition of yttrium‐doped polycrystalline and single‐crystal α‐aluminas which were heated under vacuum to temperatures above 1500°C. Extensive surface and intergranular precipitation of yttrium aluminum garnet was observed in a co…