Materials Literature
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Refractive indices for the crystals KDP, ADP, RDP, KDA, ADA, RDA, CDA, KDP:Rb, and most of their deuterated forms were measured from 404 to 1064 nm with ±3 × 10−5 accuracy. Numerical fits to standard and modified versions of the double-resonance Sellmeier formula were made, permitting interpolation of the index data c…
Colloid-chemically synthesized gigantic gold and silver clusters and microparticles have been investigated by high-resolution electron microscopy. In the case of the gold samples decahedral and icosahedral, multitwinned and triangular flattened particles were characterized. In the silver samples there were extremely s…
Abstract The influence of molecular weight on thermal transitions and on their thermodynamic parameters is discussed for a random thermotropic liquid crystalline copolyether based on the reaction of a 1:1 molar mixture of 1,5‐dibromopentane and 1,7‐dibromoheptane with 4,4′‐dihydroxy‐α‐methylstilbene. Optimum phase tra…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, structure, and magnetic and Moessbauer properties of mononuclear and asymmetric, oxo-bridged trinuclear iron(III) complexes of a new polyimidazole ligandSergiu M. Gorun, Georgia C. Papaefthymiou, Richard B. Frankel, and Stephen J. LippardCite this: J. Am. Chem. So…
Abstract The orientation development in elongational flow (spinning) of liquid crystal polymers (LCP) has been studied and a physical model derived which relates the modulus development and extensional deformation. The model defines an orientability parameter, λ, which in addition to the total elongational deformation…
The azimuthal anchoring of a nematic liquid crystal at a grooved interface is usually explained in terms of the well-known Berreman model. Recent experimental results, however, suggest that the original Berreman model must be modified in order to account for the presence of a reduced (or increased) order at the surfac…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermodynamics and the compositional variation of glass transition temperaturesP. R. CouchmanCite this: Macromolecules 1987, 20, 7, 1712–1717Publication Date (Print):July 1, 1987Publication History Published online1 May 2002Published inissue 1 July 1987https://pubs.acs.org/d…
A compositional model based on available structural evidence is proposed for amorphous calcium silicate hydrogel. It is applicable to gels in the (Ca/Si), solid range 1.0 to 1.4 and is formulated to take account of dimeric silicate species in the solid. Its composition is represented by Ca x H 6−2 x Si 2 O 7 · z Ca(OH…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTModeling of exothermic solid-solid noncatalytic reactionsJan Puszynski, Jan Degreve, and Vladimir HlavacekCite this: Ind. Eng. Chem. Res. 1987, 26, 7, 1424–1434Publication Date (Print):July 1, 1987Publication History Published online1 May 2002Published inissue 1 July 1987htt…
Uniform yttrium, lanthanum, cerium, and neodymium basic carbonate particles were prepared by homogeneous precipitation. Powders were characterized with respect to size, shape, crystal structure, and thermal decomposition behavior. Yttria precursor particles were spherical, monosized (0.4 {mu}m), and amorphous; whereas…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymerization of polyurethane-polyester interpenetrating polymer network (IPN)Y. S. Yang and L. James LeeCite this: Macromolecules 1987, 20, 7, 1490–1495Publication Date (Print):July 1, 1987Publication History Published online1 May 2002Published inissue 1 July 1987https://d…
A simple theory describing the dynamics of two-dimensional arrays of soap bubbles is proposed, and compared with a recent experiment. The average area of bubbles scales linearly at late times. Agreement with experiment is satisfactory, although not conclusive.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInteraction between copper(II) ions separated by 7.6 .ANG.. Crystal structure and magnetic properties of (.mu.-iodanilato)bis[(N,N,N',N'-tetramethylethylenediamine)copper(II)] diperchlorateFabrice Tinti, Michel Verdaguer, Olivier Kahn, and Jean Michel SavariaultCite this: In…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of Si-Si bonds from Si-H bonds in the presence of hydrosilation catalystsKatherine A. Brown-WensleyCite this: Organometallics 1987, 6, 7, 1590–1591Publication Date (Print):July 1, 1987Publication History Published online1 May 2002Published inissue 1 July 1987https:…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMononuclear manganese(IV) complexes of hydroxyl-rich Schiff base ligandsDimitris P. Kessissoglou, Xinhua Li, William M. Butler, and Vincent L. PecoraroCite this: Inorg. Chem. 1987, 26, 15, 2487–2492Publication Date (Print):July 1, 1987Publication History Published online1 Ma…
Abstract The synthesis and characterization of liquid crystalline side chain polymers with mesogenic groups laterally attached to the polymer main chain are described. By variation of the terminal group, mesogenic moiety or spacer length, a change in the glass transition temperature, the nematic to isotropic transform…
A new method for preparing the polymer films directly in the reduced atmosphere has been developed. In this process the polymerization can be carried out through depositing the component monomer vapors. Both pyromellitic dianhydride and 4,4′-diaminodiphenyl ether (oxydianiline) were evaporated at a molar ratio in term…
Nitric oxide adsorption, decomposition, and desorption were studied on Rh(100) in the temperature range from 88 to 1100 K using electron energy loss spectroscopy (EELS) and temperature programmed desorption (TPD). The EEL spectrometer was equipped with a multichannel detector for fast data acquisition. There are two a…
The structure of the elpasolite Cs2KCr(CN)6 has been determined at 7.0 K by neutron diffraction. 877 unique reflections refined to Rw = 0.020, ? = 1.4. The Cr(CN)6 unit is close to regular octahedral coordination geometry, with bond lengths of 207.4(4) for Cr-C and 116.6(6) pm for C-N. The C-Cr-C angles average to 90.…
Abstract The tetracyanoethylene anion radical ( \documentclass{article}\pagestyle{empty}\begin{document}${\rm TCNE}^{ \cdot ^ - } $\end{document} ) was detected by ESR spectroscopy in polytetrafluoroethylene (PTFE), which had been mechanically fractured in vacuo with tetracyanoethylene (TCNE) at 77 K. The assignment o…