Materials Literature
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Abstract In the presence of a catalytic amount of bis(dipivaloylmethanato)manganese(II) (= Mn(dpm)2), various cholesterol derivatives are smoothly converted into the corresponding β-epoxides in good to high yields with combined use of molecular oxygen and isobutyraldehyde. These stereoselectivities are the reversal of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTImproved synthesis of alumina-pillared montmorillonite by surfactant modificationLaurent J. Michot and Thomas J. PinnavaiaCite this: Chem. Mater. 1992, 4, 6, 1433–1437Publication Date (Print):November 1, 1992Publication History Published online1 May 2002Published inissue 1 N…
Cu2+ and VO2+ are the paramagnetic centers of the ferroelectric complexes ML2 that both display a S mesophase. The spontaneous polarization of these first paramagnetic ferroelectric liquid crystals is 23 and 20 nCcm−2, respectively.
It is commonly observed that displacive phase transitions, including ferroelectric phase transitions, can be accurately described by mean-field theory and hence Landau theory. In same cases the reasons why can be deduced by renormalisation group theory, but there are many other cases where the reasons are less clear.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemistry of poly(pyrrole chloride) films: a study of polymerization efficiency, ion transport during redox and doping level assay by electrochemical quartz crystal microgravimetry, pH and ion-selective electrode measurementsC. S. C. Bose, S. Basak, and K. RajeshwarCi…
An elektronische Schaltkreise erinnert das Bild rechts eher als an eine chemische Formel. Es symbolisiert jedoch einen Ru 22 ‐Komplex, wobei die Kreise für Metallzentren, die Sägezahnkurven für verbrückende und die Striche für terminale Liganden stehen. Der Ru 22 ‐komplex, der zur Klasse der Kaskadenverbindungen (Arbo…
A theory based on the concepts of quasi-punctual defects and hierarchically constrained molecular dynamics is extended to account for the effects of large stresses on the rate of elementary molecular motions. The extended theory provides a physical interpretation for the general features of the experimentally observed…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDielectric relaxations of poly(fluoroalkyl methacrylates) and poly(fluoroalkyl .alpha.-fluoroacrylates)Shun Koizumi, Kenji Tadano, Yuji Tanaka, Tetsuo Shimidzu, Shoichi Kutsumizu, and Shinichi YanoCite this: Macromolecules 1992, 25, 24, 6563–6567Publication Date (Print):Nove…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanistic studies of group transfer polymerization. Silyl group exchange studiesRoderic P. Quirk and Jie RenCite this: Macromolecules 1992, 25, 24, 6612–6620Publication Date (Print):November 1, 1992Publication History Published online1 May 2002Published inissue 1 November…
The tensile properties of three carbon matrix composites reinforced with SiC (Nicalon) fibers (materials A, B, C) have been measured with and without notches. One of the three materials (material B) had a relatively low strength and exhibited notch brittleness. This material had both a high interface sliding stress an…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, reactivity, and dynamic behavior of a boron-containing silsesquioxaneFrank J. Feher, Theodore A. Budzichowski, and Joseph W. ZillerCite this: Inorg. Chem. 1992, 31, 24, 5100–5105Publication Date (Print):November 1, 1992Publication History Published online1 May 200…
Electron-beam induced deposition (EBID) of tungsten from the precursor gas W(CO)6 was investigated with the aim of enhancing the growth rate of the process. By varying dwell and loop time over a limited range, experimental deposition rates were compared to a time dependent model developed to describe the focused ion b…
From the systematic replacements of amino acid residues of Escherichia coli ribonuclease HI with those of its thermophilic counterpart, the basic protrusion domain including region 6 (R6) from residues 91 to 95 was found to increase the structural stability of the mutant protein (Kimura, S., Nakamura, H., Hashimoto, T…
Barnacle adhesion measurements provide an excellent method of assessing the foul release characteristics of non‐toxic surfaces. This paper describes both tensile and shear force methods that have been developed for field applications. Selected data are presented and the results discussed with respect to the variables…
Cobalt was incorporated by direct synthesis into three distinct kinds of microcrystalline microporous aluminophosphates (ALPOs): the large-pore ALPO-5 (free diameter ca. 7 angstrom), medium-pore ALPO-11 (free diameter ca. 6 angstrom), and small-pore ALPO-21 (free diameter < 4 angstrom) molecular sieves. All three p…
The results of two‐step oxidation experiments on chemically‐vapor‐deposited Si 3 N 4 and SiC at 1350°C show that a correlation exists between the presence of a Si 2 N 2 O interphase and the strong oxidation resistance of Si 3 N 4 . During normal oxidation, k p for SiC was 15 times higher than that for Si 3 N 4 , and t…
Abstract The local magnetic moments and hyperfine fields on the crystallographically different Fe and Y sites and on the interstitial atoms Z are calculated for the technologically important hard magnetic compounds Y 2 Fe 17 and Y 2 Fe 17 Z 3 with Z = H, C, N by means of the local‐spin‐density approximation and the li…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrotris(3-neopentylpyrazol-1-yl)borates: a new type of sterically hindered poly(pyrazolyl)boratesJ. C. Calabrese and S. TrofimenkoCite this: Inorg. Chem. 1992, 31, 23, 4810–4814Publication Date (Print):November 1, 1992Publication History Published online1 May 2002Published…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of anion polarization on conductivity behavior of poly(ethylene oxide) complexed with alkali saltsS. Besner, A. Vallee, G. Bouchard, and J. Prud'hommeCite this: Macromolecules 1992, 25, 24, 6480–6488Publication Date (Print):November 1, 1992Publication History Publishe…
Using polarization microscopy, we have investigated the director configurations of droplets of a nematic liquid crystal with negative dielectric anisotropy and perpendicular boundary conditions subjected to electric fields. The droplets were suspended in liquid poly(dimethyl siloxane) and electric fields were applied…