Materials Literature
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On the basis of Raman spectra and x-ray-diffraction patterns, we show that both dense zirconium and hafnium dioxides adopt the same structural phases, in similar pressure ranges. Furthermore both dioxides may be quenched at room conditions from high pressure to give polycrystalline solids which present optical transpa…
Crystalline TiO 2 powders were prepared by the homogeneous precipitation method simply by heating and stirring an aqueous TiOCl 2 solution with a Ti 4+ concentration of 0.5 M at room temperature to 100°C under a pressure of 1 atm. TiO 2 precipitates with pure rutile phase having spherical shapes 200‐400 nm in diameter…
The indirect Fourier transformation (IFT) is the method of choice for the model-free evaluation of small-angle scattering data. Unfortunately, this technique is only useful for dilute solutions because, for higher concentrations, particle interactions can no longer be neglected. Thus an advanced technique was develope…
This paper describes a simple orbital picture for understanding the optical transitions and the second-order nonlinear optical response of metallocene-based chromophores of the form metallocene−(π-bridge)−acceptor, and experimental studies to test this model. From a combination of UV photoelectron spectroscopy, cyclic…
A model for metal-oxide surge arresters, derived from that one recommended from the IEEE W.G. 3.4.11, is presented. The main innovation introduced by the paper lies in the simplicity of the criteria proposed for the model's parameter identification. Such criteria allow calculation of the model parameters directly from…
Hexagonally ordered nanopore arrays in anodic alumina with high aspect ratios (see Fig.) have been produced using a self-organization process. The pore arrays are straight and parallel, and of polycrystalline structure. The distance between pores can be controlled by adjusting the electrolyte and the applied voltage.…
Various deformation models incorporating higher-order gradients are discussed and their implications are considered in a variety of problems ranging from the determination of the size of dislocation cores or elastic dislocation interaction to the determination of wavelengths of dislocation patterns or heterogeneous di…
Liquid Crystals -- Basic Physical Properties: Structure and Symmetry of Liquid Crystal Phases. LC Mixtures, the Temperature Range and Phase Transitions. Basic Physical Properties. Surface Phenomena and Cell Preparation. New Basic Developments in Liquid Crystals. Electrooptical Effects in Liquid Crystal Materials: Elec…
Colloidal gold adsorbed onto positively charged substrates forms a two-dimensional layer with a maximum coverage of 1 colloid/1000 nm 2 as shown by optical absorption spectroscopy, small-angle X-ray scattering, and atomic force microscopy. Positively charged substrates are obtained by either chemisorption of end-group…
Textured bismuth titanate, Bi 4 Ti 3 O 12 (BiT), was produced by templated grain growth (TGG). Molten‐salt‐synthesized BiT platelets were dispersed in a matrix of 200 nm BiT powder and aligned by tape casting. Highly textured BiT was obtained with the use of only 5 vol% template particles by sintering at 1000°C for 1…
A biomolecular-derived route for the self-assembly of inorganic nanoparticles using the recognition properties of antibodies attached to the surface of the gold nanoparticles is reported. The high specificity of antibody–antigen coupling is exploited to generate extended three-dimensional networks of metal nanoparticl…
We present results of local spin density approximation (LSDA) pseudopotential calculations for the perovskite structure oxide, bismuth manganite $({\mathrm{BiMnO}}_{3}).$ The origin of the differences between bismuth manganite and other perovskite manganites is determined by first calculating total energies and band s…
Abstract Experimental cation exchange capacities (CEC) of kaolinites were determined and compared to theoretical calculations of CEC. The comparison reveals that the exchangeable cations occur mostly on the edges and on the basal (OH) surfaces of the mineral. It also shows that permanent negative charge from isomorpho…
Solid‐oxide fuel cells based on doped ceria electrolytes and operating at 500°C are shown to be feasible. The operating regime of doped ceria electrolytes is discussed. It is shown that the ionic conductivity of ceria‐based fuel cells is sufficiently high for operation with hydrogen fuel at low temperatures. The major…
We present a detailed study of the lattice dynamics and of the phase stability of cubic zincblende (c-BN) and hexagonal (h-BN) boron nitrides. The phonon-dispersion relations at different densities are calculated using a first-principles force-constant method. The calculated eigenfrequencies and phonon Gr\"uneisen par…
The mineral dolomite and the uncertainties surrounding its origin have attracted the attention of earth scientists for over a century. The core of the dolomite problem is the apparent paradox posed by the paucity of dolomite in modern marine depositional environments versus its relative abundance in the sedimentary ro…
EXPO is the integration of two programs, EXTRA and SIRPOW.92 , the first devoted to full powder pattern decomposition and the second to the solution and refinement of crystal structures. The program is able to exploit the prior information obtained during the crystal structure solution process for improving the classi…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTStereoselective Ring-Opening Polymerization of meso-Lactide: Synthesis of Syndiotactic Poly(lactic acid)Tina M. Ovitt and Geoffrey W. CoatesView Author Information Department of Chemistry and Chemical Biology Baker Laboratory, Cornell University Ithaca, New York 14853…
The specific heat and thermal conductivity of millimeter-long aligned carbon multiwall nanotubes (MWNT's) have been measured. As a rolled-up version of graphene sheets, a MWNT of a few tens nm diameter is found to demonstrate a strikingly linear temperature-dependent specific heat over the entire temperature range mea…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTNanocages Derived from Shell Cross-Linked Micelle TemplatesHaiyong Huang, Edward E. Remsen, Tomasz Kowalewski, and Karen L. WooleyView Author Information Department of Chemistry, Washington University One Brookings Drive, St. Louis, Missouri 63130 Monsanto Company, 800…