Materials Literature
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Abstract An amorphous zinc-aluminium oxide solid solution, Zn0.67Al0.33O1.17, Prepared by the thermal decomposition of the acidic layered double hydroxide (LDH), [Zn0.67·Al0.33(OH)2](CO3)1.17·0.33H2O, was found to react with Keggin-like heteropolyoxometalate anions such as α-[Si·W11O39]8− and α-1,2,3-[SiV3W9O40]7− in…
A general deformation of a smectic C liquid crystal is composed of five different distortions, each of which can be made independently. Here we show that to each of these distortions we can assign a simple vector operator. Use of these five basis operators enables us to write down the elastic free energy density as a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPoly(vinylsilane): a precursor to silicon carbide. 1. Preparation and characterizationBruno Boury, Robert J. P. Corriu, Dominique Leclercq, P. Hubert Mutin, Jean Marc Planeix, and Andre ViouxCite this: Organometallics 1991, 10, 5, 1457–1461Publication Date (Print):May 1, 199…
Polished (001) cleavage faces of Nain Labradorite ($$An \approx 56$$) were leached at 20°C ($$\pm 2^{\circ}$$) for 72 days in distilled water ($$pH \approx 5.6$$), in HCl solution ($$pH \approx 4.05$$) and in four other HCl solutions containing 1 mg/l or less of Na, K, Ca, Al(aq), and $$SiO_{2}(aq)$$ ($$pH of all four…
The author reviews some of the device properties of diamonds, as well as recently developed diamond device fabrication techniques for high-frequency, high-power transistors. Two advantages of diamond over other semiconductors used for high-frequency, high power devices are its high thermal conductivity and high electr…
Low‐energy electron diffraction (LEED) beam intensities were measured from the freshly cleaved [in ultrahigh vacuum] MgO(001) surface using beam energy modulation to avoid electrical charging. Dynamic LEED analysis of the data indicates: (1) an interlayer relaxation of (1±2)% and a rumple of the first layer ions of (5…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFluoride as a terminal and bridging ligand for copper: isolation and x-ray crystallographic characterization of copper monomeric and dimeric complexes [CuII(TMPA)F]nn+ (n = 1 or 2; TMPA = tris[(2-pyridyl)methyl]amine)Richard R. Jacobson, Zoltan Tyeklar, Kenneth D. Karlin, an…
Heat-shock stress causes inactivation and aggregation of various cellular proteins which become further insoluble. Previous studies have shown that the interferon-induced p68 kinase activity was greatly reduced in extracts of heat-shocked HeLa cells, and that the loss of activity was due to a decreased solubility of t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTColumnar liquid crystals in polypeptides. 1. A columnar hexagonal liquid crystal observed in poly(.gamma.-octadecyl L-glutamate)Junji Watanabe and Yoshimasa TakashinaCite this: Macromolecules 1991, 24, 11, 3423–3426Publication Date (Print):May 1, 1991Publication History Publ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOne-dimensional triplet energy migration in columnar liquid crystals of octasubstituted phthalocyaninesDimitra Markovitsi, Isabelle Lecuyer, and Jacques SimonCite this: J. Phys. Chem. 1991, 95, 9, 3620–3626Publication Date (Print):May 1, 1991Publication History Published onl…
Recent advances in the chemical vapor deposition (CVD) and characterization of diamond films on nondiamond substrates are reviewed. Major growth techniques, including hot filament CVD; microwave, RF, or DC plasma enhanced CVD; and combustion flame growth; as well as a number of hybrid and novel approaches, are describ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSegregation of block copolymer micelles to surfaces and interfacesKenneth R. Shull, Karen I. Winey, Edwin L. Thomas, and Edward J. KramerCite this: Macromolecules 1991, 24, 10, 2748–2751Publication Date (Print):May 1, 1991Publication History Published online1 May 2002Publish…
In this study, the contact loads and regions on facets of a lumbar motion segment are quantitatively determined. The analysis accounts for both material and geometric nonlinearities and treats the facet articulation as a frictionless, nonlinear, moving contact problem. The loadings consist of axial torque and lateral…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIntrinsic binding properties of a differentiated iron subsite in analogs of native [Fe4S4]2+ clustersJohn A. Weigel and R. H. HolmCite this: J. Am. Chem. Soc. 1991, 113, 11, 4184–4191Publication Date (Print):May 1, 1991Publication History Published online1 May 2002Published…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of dihelicate and mononuclear complexes from ethane-bridged dimeric bipyridine or phenanthroline ligands with copper(I), cobalt(II), and iron(II) cationsMarie Therese Youinou, Raymond Ziessel, and Jean Marie LehnCite this: Inorg. Chem. 1991, 30, 9, 2144–2148Publica…
The glass transition studied for suspensions of colloidal particles through dynamical light-scattering experiments is analyzed within the mode-coupling theory for the supercooled liquid dynamics. These suspensions are treated as simple atomic systems with a hard-sphere interaction. The scaling properties predicted by…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDependence of electron transfer rates on donor-acceptor angle in bis-porphyrin adductsAnna Helms, David Heiler, and George McLendonCite this: J. Am. Chem. Soc. 1991, 113, 11, 4325–4327Publication Date (Print):May 1, 1991Publication History Published online1 May 2002Published…
Scanning tunneling microscopy (STM) observation was performed for the surface of diamond epitaxial film which was grown on a diamond (001) substrate by microwave plasma-assisted chemical vapor deposition (CVD). The surface was stable even in air, and it showed a reflection high-energy electron diffraction (RHEED) patt…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTransfer energetics of tetraalkylammonium picrates in an aqueous ionic cosolvent system and the salt effect on hydrophobic hydrationHimansu Talukdar and Kiron Kumar KunduCite this: J. Phys. Chem. 1991, 95, 9, 3796–3800Publication Date (Print):May 1, 1991Publication History P…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and structural characterization of decaselenidoheptamercurate(4-) and [Hg7Se9]n4n-: novel metal-chalcogenide frameworksKang Woo Kim and Mercouri G. KanatzidisCite this: Inorg. Chem. 1991, 30, 9, 1966–1969Publication Date (Print):May 1, 1991Publication History Publi…