Materials Literature
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A new algorithm to determine phase equilibria at the global minimum of the Gibbs free energy is presented. Using the Newton homotopy-continuation method, when checking for phase stability, multiple stationary points of the tangent-plane-distance function (TPDF) are determined. Subsets of these are selected as estimate…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNovel Contrast Agents for Magnetic Resonance Imaging. Synthesis and Characterization of the Ligand BOPTA and Its Ln(III) Complexes (Ln = Gd, La, Lu). X-ray Structure of Disodium (TPS-9-145337286-C-S)-[4-Carboxy-5,8,11-tris(carboxymethyl)-1-phenyl-2-oxa- 5,8,11-triazatridecan…
Perpendicularly oriented columnar structure was obtained for electropolymerized polypyrrole films formed from micellar solution of anionic surfactants. The surfactants used as dopants were a class of anionic surfactant, namely, sodium salts of dodecyl sulfate (SDS) and dodecylbenzene sulfonate (SDBS). The formation pr…
Characterization of the interaction of water with the highly ordered mesoporous solid MCM-41 (pore diameter -2.5 nm) is undertaken with the aid of several techniques (adsorption gravimetry, X-ray diffraction, Fourier transform infrared spectroscopy, and controlled rate-evolved gas analysis). The relatively complex wat…
Monodisperse colloids have found a wide range of technolgoical applications, in fields as diverse as ceramics, pigments, and catalysis. Recent work in analyzing the mechanism of formation of the particles is reviewed, and the facotrs influencing the size and shape of the colloids, such as the SiO 2 particles shown in…
The structural aspect of the temperature-induced neutral-to-ionic transition in the mixed-stack charge-transfer complex TTF-p-chloranil is directly analyzed using results obtained from neutron-scattering experiments. The symmetry breaking of the structural order parameter is determined together with the complete struc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTZigzag Morphology of a Poly(styrene-b-hexyl isocyanate) Rod-Coil Block CopolymerJ. T. Chen, E. L. Thomas, C. K. Ober, and S. S. HwangCite this: Macromolecules 1995, 28, 5, 1688–1697Publication Date (Print):February 1, 1995Publication History Published online1 May 2002Publish…
<div class="htmlview paragraph">A new 3-way catalyst with NO<sub>x</sub> conversion performance for lean-burn engines has been developed. The catalyst oxidizes NO<sub>x</sub> and stores the resulting nitrate, which is then reduced by HC and CO during engine operation around the stoichiome…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTShape of GlycinePeter D. Godfrey and Ronald D. BrownCite this: J. Am. Chem. Soc. 1995, 117, 7, 2019–2023Publication Date (Print):February 1, 1995Publication History Published online1 May 2002Published inissue 1 February 1995https://pubs.acs.org/doi/10.1021/ja00112a015https:/…
<div class="htmlview paragraph">A new, ultra-clean alternative fuel for diesel engines-a blend consisting predominantly of dimethyl ether (DME)- has been identified and evaluated by the authors. This paper reports engine test results with DME blends at emissions levels that will meet and surpass the California U…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular Meccano. 2. Self-Assembly of [n]CatenanesDavid B. Amabilino, Peter R. Ashton, Christopher L. Brown, Emilio Cordova, Luis A. Godinez, Timothy T. Goodnow, Angel E. Kaifer, Simon P. Newton, Marek Pietraszkiewicz, and Cite this: J. Am. Chem. Soc. 1995, 117, 4, 1271–129…
Electrical resistivity (\ensuremath{\rho}) and magnetic susceptibility (\ensuremath{\chi}) were measured for single crystals of ${\mathrm{La}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Sr}}_{1+\mathit{x}}$${\mathrm{MnO}}_{4}$ (0.0\ensuremath{\le}x\ensuremath{\le}0.7), which were grown by the floating-zone method…
Several nickel(II) complexes containing pyridine (py), pyrazine (pyz) or methylpyrazine (mepyz) have been synthesized and characterized by vibrational and electronic spectroscopy, differential scanning calorimetry, and magnetic susceptibility studies to cryogenic temperatures. A comparison of the magnetic properties o…
We have been developing an instrument that combines the techniques of x-ray photoelectron spectroscopy and zone plate microfocusing to perform spectromicroscopy. The X1A undulator provides a bright photon source in the soft x-ray range with a high degree of spatial coherence (a requirement for zone plate focusing). A…
Novel composite electrode structures have been fabricated by single‐step electropolymerization of polypyrrole onto a porous graphite fiber matrix. The graphite substrate provides a lightweight structure with high surface area. The available charge capacity of the composite electrodes was proportional to the electropol…
ABSTRACT The role of environmental factors in seasonal succession of six clones of marine diatoms was examined by testing effects of various combinations of temperature (5°, 10°, 15°, 20°C) and photoperiod (10, 12, 14, 16 h) on time to germination of resting stages and subsequent vegetative cell division rates. Restin…
Abstract Potassium beryllium borate fluoride, KBe 2 · BO 3 F 2 , is rhombohedral (hexagonal axes) R 32 (No.155), a = b = 4.427(4) Å, c = 18.744(9) Å, V = 318.3(4) Å 3 , M = 153.93, D m = 2.40g · cm −3 , D x = 2.41 g · cm −3 for Z = 3, F (000) = 222, μ = 11.84 cm −1 , T = 296 K. The crystal structure has been determine…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical Oxidation of Polyaniline in Nonaqueous Electrolytes: "In Situ" Raman Spectroscopic StudiesM. Lapkowski, K. Berrada, S. Quillard, G. Louarn, S. Lefrant, and A. PronCite this: Macromolecules 1995, 28, 4, 1233–1238Publication Date (Print):February 1, 1995Publica…
The cooperative diffusion coefficient ${\mathit{D}}_{\mathit{c}}$ for spherical particle suspensions is calculated using a ``mode-coupling'' method which extends previous calculations of ${\mathit{D}}_{\mathit{c}}$ for critical fluids and semidilute polymer solutions. The renormalization of the viscosity in the veloci…
Intersystem crossing is the crucial first step determining the quantum efficiency of very many photochemical and photophysical processes. Spin-crossover compounds of first-row transition metal ions, in particular of Fe(II), provide model systems for studying it in detail. Because in these compounds there are no compet…