Materials Literature
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The dielectric constant and losses of good quality ceramic samples of Nb-doped (1 wt % ${\mathrm{Nb}}_{2}$${\mathrm{O}}_{5}$) ${\mathrm{PbZr}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Ti}}_{\mathit{x}}$${\mathrm{O}}_{3}$ about the ferroelectric-paraelectric transition for 0.03\ensuremath{\le}x\ensuremath{\le}0.0…
In an Fe-Al-Si-O-H (FASH) system, the predominant hypothetical stoichiometric end-members are H2Fe4Al18Si8O48 (2H) and H6Fe2Al18Si8O48 (6H). End-member molar volume (V), specific heat (Cp), and calorimetric entropy (S) are presented. Using: 1) the above values for V and Cp, 2) thermodynamic data for additional phases…
Abstract Narrow‐distribution fractions of poly{2,5‐bis[(4‐methoxybenzoyl)oxy] styrene} ranging in weight‐average molecular weight Mw from 1.1 × 10 5 to 1.96 × 10 6 were studied by static light scattering and viscometry in THF at 25 ° C. From Mw and the intrinsic viscosity [ η ] Mark‐Houwink‐Sakurada equation was formu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDensity Discontinuity at the Microphase Separation Transition of a Symmetric Diblock CopolymerH. Kasten and B. StuehnCite this: Macromolecules 1995, 28, 13, 4777–4778Publication Date (Print):June 1, 1995Publication History Published online1 May 2002Published inissue 1 June 1…
Summary The sorption of zinc (Zn) by two acid tropical soils, Mazowe clay loam (kaolinitic, coarse, Rhodic Kandiustalf) and Bulawayo clay loam (coarse, kaolinitic, Lithic Rodustalf), was studied over a wide range of Zn solution concentrations. Samples of the two soils used in the experiments were collected at both unc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEfficient Preparation of the .alpha.,.alpha.,.beta.,.beta.-Atropoisomer of meso-Tetrakis(o-aminophenyl)porphyrinEric Rose, Aurelien Cardon-Pilotaz, Melanie Quelquejeu, Nicolas Bernard, Alain Kossanyi, and Bernard DesmazieresCite this: J. Org. Chem. 1995, 60, 12, 3919–3920Pub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray Photoelectron Spectroscopic Studies of Cadmium and Selenite Adsorption on Aluminum OxidesCharalambos. PapelisCite this: Environ. Sci. Technol. 1995, 29, 6, 1526–1533Publication Date (Print):June 1, 1995Publication History Published online1 May 2002Published inissue 1 J…
Simulation procedures for typical Johnson-Mehl crystals generated under various models for random nucleation are proposed. These procedures include algorithms for simulating spatio-time-inhomogeneous Poisson processes. Empirical results for a particular class of Johnson-Mehl tessellations in two and three dimensions s…
Abstract Interpenetrating polymer networks (IPNs) based on a polyurethane (PU) and two unsaturated polyester (UPE) resins (a commercially available UPE and a partially endcapped UPE) were prepared. The mechanical properties, such as tensile strength, elongation at break, impact strength, and dynamic mechnical properti…
Abstract The clay mineral distribution in the Early Cretaceous depositional sequences along the Cameros Basin has been established on the basis of XRD traces and TEM/EDAX analyses. Samples from the Latest Berriasian-Barremian depositional sequences are characteristic of epimetamorphic conditions. Illite ‘crystalliniti…
Abstract A detailed force‐field‐based evaluation of the molecular geometries of small‐ring cyclodextrins 1–3 with three, four, and five α(1→4)‐linked glucose residues and the starch‐derived α‐cyclodextrin ( 4 ) was performed by using molecular mechanics and high‐temperature annealing. The resulting minimum‐energy stru…
A new class of functional units for preparing charge transfer salts , based on π‐stacks of a conducting oligomer in analogy to the well‐known stacks of TTF units, is reported and provides a connection between CT salts and conducting polymers. The synthesis of the new water‐soluble thiophene oligomer is presented and i…
Abstract Attempts to prepare various peripheral tetra‐ and octasubstituted (phthalocyaninato)iron derivatives R n PcFe [ n = 4: R = CH 2 OEt ( 6e ), CO 2 Et ( 6h ), CO 2 ‐ n ‐C 6 H 13 ( 6l ), O(2‐Et‐ n ‐C 6 H 13 ) ( 6j ), OCH 2 C(CH 3 ) 3 ( 6k ), OCH 2 C(CH 3 ) 2 CH 2 Ph ( 6l ); n = 8: R = CH 2 CH(CO 2 Me)CH(CO 2 Me)C…
The third‐order nonlinear optical susceptibilities χ (3) of M 2 O‐B 2 O 3 (M = Li, Na, K, Rb, Cs, and Ag) binary borate glasses have been measured by the third harmonic generation (THG) method. It is found that the enhancement of χ (3) by the structural change of BO 3 units to BO 4 units is small, while the enhancemen…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic Coupling and 1H NMR Spectroscopy of Binuclear Copper(II) ComplexesJoseph H. Satcher Jr. and Alan L. BalchCite this: Inorg. Chem. 1995, 34, 13, 3371–3373Publication Date (Print):June 1, 1995Publication History Published online1 May 2002Published inissue 1 June 1995ht…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrophobic Nature of Membrane-Spanning .alpha.-Helical Peptides as Revealed by Monte Carlo Simulations and Molecular Hydrophobicity Potential AnalysisRoman G. Efremov and Gerard VergotenCite this: J. Phys. Chem. 1995, 99, 26, 10658–10666Publication Date (Print):June 1, 1995…
The surface layer of crystalline silicon implanted with 1.5 MeV Si ions with doses ranging from 1×1011 to 1×1015 Si+/cm2 has been studied by Raman scattering. Raman line intensities, shapes and shifts have been used to investigate the defects in the near-surface layer. Above doses of 1×1013 Si+/cm2, Raman provides evi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal Stability Studies on a Homologous Series of NitroarenesJimmie C. Oxley, James L. Smith, Hong Ye, Robert L. McKenney, and Paul R. BolducCite this: J. Phys. Chem. 1995, 99, 23, 9593–9602Publication Date (Print):June 1, 1995Publication History Published online1 May 2002…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEvidence of the Importance of Back-Bonding in Determining the Behavior of Ruthenated Cyanophenyl Cobalt Porphyrins as Electrocatalysts for the Reduction of DioxygenBeat Steiger and Fred C. AnsonCite this: Inorg. Chem. 1995, 34, 12, 3355–3357Publication Date (Print):June 1, 1…
The dynamic behavior of atoms in the more regular and more disordered regions in a molecular dynamics model of glassy argon is investigated. Partial velocity autocorrelation functions and their Fourier transforms are calculated for both types of regions. It is found that the more disordered regions are responsible for…