Materials Literature
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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…
The thermal conductivity and diffusivity of free-standing silicon nitride (Si-N) films of 0.6 and 1.4 μm in thickness are measured. A new experimental technique, the amplitude method, is proposed and applied to measurement of the thin-film thermal diffusivity. The thermal diffusivity is determined by three independent…
Poly(A) polymerase synthesizes poly(A) tails rapidly and processively only when the substrate RNA is bound simultaneously by two stimulatory proteins, the cleavage and polyadenylation specificity factor (CPSF) and poly(A)-binding protein II (PAB II). A burst of synthesis terminates after the addition of about 250 nucl…
Experimentally derived optical constants and X-ray attenuation cross sections were used to construct the complete dipole oscillator strength distribution for solid, dry DNA. Monte Carlo simulations of the energy loss by electrons of initial energy 5 keV to 1 MeV in DNA were performed using cumulative inelastic cross s…
In this paper we discuss the optical reflective properties of single and multidomain cholesteric liquid crystals both experimentally and theoretically. The multidomain system has been prepared by dispersing a low concentration of polymer in a cholesteric liquid crystal. This results in a (passive) bistable colorful re…
We present the results of computer simulation studies of SrTiO 3 . After deriving a reliable potential model, we concentrate on the properties of defects and dopants. Our calculations are used to propose a defect model that is consistent with experimental observations. For vacancy disorder, the calculations show that…