Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGrowth of lamellar Hofmann clathrate films by sequential ligand exchange reactions: assembling a coordination solid one layer at a timeChristine M. Bell, Mark F. Arendt, Lorena Gomez, Russell H. Schmehl, and Thomas E. MalloukCite this: J. Am. Chem. Soc. 1994, 116, 18, 8374–8…
The probabilities for up-conversion involving two nearest-neighbor ${\mathrm{Ho}}^{3+}$${(}^{5}$${\mathit{I}}_{7}$) ions and ${\mathrm{Tm}}^{3+}$${(}^{3}$${\mathit{F}}_{4}$) ions in ${\mathrm{Y}}_{3}$${\mathrm{Al}}_{5}$${\mathrm{O}}_{12}$ have been determined. The final states are $^{5}$${\mathit{I}}_{5}$ and $^{5}$${…
The continuous precipitation of calcium carbonate is studied here with on-line particle size distribution evaluation and in-situ video visualization. Morphological characterizations of collected samples using differential scanning calorimetry (DSC), X-ray diffraction (XRD), scanning electron microscopy (SEM), and cryo…
Latex polyballs are suspended in an isotropic micellar solution which exhibits a nematic phase at low temperatures. At the transition, we observe that the particles are either retained or expelled from the structured phase depending on their size. A mean field theory with two coupled order parameters is proposed to ac…
In order to gain an understanding of highly reliable electrical characteristics for the Ho-doped multilayer ceramic capacitors with Ni electrodes, dielectric properties of various rare-earth-oxide-doped BaTiO 3 ceramics were studied. The smaller ionic radius rare-earth-oxide (Dy, Ho, Er)-doped samples showed lower res…
The change of the \ensuremath{\alpha} relaxation process occurring during isothermal crystallization of a glassy polymer, poly(aryl ether ketone ketone), has been followed in real time through measurement of the dielectric complex permittivity. The dielectric strength has been correlated with the degree of crystallini…
We discuss the dynamic properties of a semidilute grafted polymer layer exposed to pure solvent. When the grafting energy of the head groups of the chains is finite, the chains desorb and are expelled from the layer. We combine Monte Carlo simulations using the bond fluctuation model to self-consistent mean field calc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReal-Time SAXS Observations of Lamella-Forming Block Copolymers under Large Oscillatory Shear DeformationShigeru Okamoto, Kenji Saijo, and Takeji HashimotoCite this: Macromolecules 1994, 27, 20, 5547–5555Publication Date (Print):September 1, 1994Publication History Published…
The reduced layered niobate Rb2LaNb2O7 was synthesized via the reaction of RbLaNb2O7 with rubidium vapor at temperatures between 200 and 250 degrees C. The structures of both materials have been determined by Rietveld analysis of time-of-flight powder neutron diffraction data. The cream-colored host compound RbLaNb2O7…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrogen-Permselective SiO2 Membrane Formed in Pores of Alumina Support Tube by Chemical Vapor Deposition with TetraethylorthosilicateShengchun Yan, Hideaki Maeda, Katsuki Kusakabe, Shigeharu Morooka, and Yasunobu AkiyamaCite this: Ind. Eng. Chem. Res. 1994, 33, 9, 2096–2101…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStability of Main-Group Element-Centered Gold Cluster CationsOliver D. Haeberlen, Hubert Schmidbaur, and Notker RoeschCite this: J. Am. Chem. Soc. 1994, 116, 18, 8241–8248Publication Date (Print):September 1, 1994Publication History Published online1 May 2002Published inissu…
Starburst dendrimers are novel, water-soluble polymeric materials, with a well-defined composition and structure. In our application, we used dendrimers composed of poly(amidoamine) groups to which we coupled several specific antibodies, to investigate potential formats based on radial partition immunoassay. The coupl…
Epitaxial growth of BaTiO 3 , SrTiO 3 and their superlattices was carried out by the alternating evaporation method using an atomic-layer-epitaxy control system for molecular beam epitaxy (MBE). Stable and reproducible control of the chemical composition was achieved by layer-by-layer growth with this system. Both BaT…
Raman and various photoluminescence (PL) techniques were employed to investigate the role of nitrogen doping on the optical spectra of chemical-vapor-deposited (CVD) diamond films and to determine the origin of the characteristic broadband luminescence which is observed from approximately 1.5 to 2.5 eV and centered at…
An investigation was made of the reasons why ferroelectric PbTiO 3 films are hard to grow on single-crystal Si substrates. PbTiO 3 films were formed on Si(100) and MgO(100) single-crystal substrates, and X-ray photoelectron spectroscopy (XPS) was used to analyze the composition, chemical structure and oxidation state…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and Characterization of Two Aromatic Silicon-Containing Dianions:The 2,3,4,5-Tetraphenylsilole Dianion and the 1,1'-Disila-2,2',3,3',4,4',5,5'-Octaphenylfulvalene DianionJang-Hwan Hong, Philip Boudjouk, and Stephen CastellinoCite this: Organometallics 1994, 13, 9,…
Texture transition of Pb(Zr 1−x Ti x )O 3 thin films grown from a metallo–organic solution onto Pt/Ti/SiO 2 /Si substrates has been studied. The orientation obtained depends on the crystallization temperature and time and can be drastically altered by modifying the heat treatment schedule. A [100] texture requires an…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLow-Temperature Fourier Transform Infrared Study of the Interaction of CO with Cations in Alkali-Metal Exchanged ZSM-5 ZeolitesA. Zecchina, S. Bordiga, C. Lamberti, G. Spoto, L. Carnelli, and C. Otero AreanCite this: J. Phys. Chem. 1994, 98, 38, 9577–9582Publication Date (Pr…
In 1896 Henri Becquerel discovered that a uranium salt could darken a photographic plate, and from this effect he went on to discover radioactivity. In 1934 H. Frenzel and H. Schultes exposed a photographic plate to acoustic waves generated in a water bath and also observed a darkening of the plate. They attributed th…
Pb(Zr x Ti 1- x )O 3 (PZT) thin films were prepared on Ir and IrO 2 electrodes. Ir has very similar properties to Pt, and IrO 2 is a conductive oxide. Perovskite single-phase PZT thin films were obtained on their electrodes. PZT thin films were grown by the conventional sol-gel method with rapid thermal annealing (RTA…