Materials Literature
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Transmission M\"ossbauer spectra at variable temperatures between 80 and 860 K have been collected for Co-substituted magnetities, ${\mathrm{Co}}_{\mathit{x}}$${\mathrm{Fe}}_{3\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{O}}_{4}$, with x=0.1, 0.2, and 0.4, and at two selected temperatures with the absorber in a longit…
Abstract In this report we present, to our knowledge, the first Raman investigations at single crystalline Ag(111), Ag(110) and microfacetted Ag(110) samples, which were exposed to N 2 or N 2 + reactive gases (oxygen and ethylene). The pressure and temperature ranges are close to those used for industrial oxidation of…
We emphasize the role of the dopant potential on the stability and magnetic properties of bipolarons in a conducting polymer. For this purpose the singlet and the triplet states of a bipolaron have been calculated within an adiabatic deformable continuum model including short-range Coulomb repulsions between electrons…
Abstract A novel process to produce microcellular PVC foams with a very homogeneous cell distribution and cell densities ranging from 10 7 to 10 9 cells/cm 3 is described. Microcellular PVC foams with relative densities (density of foam divided by the density of unfoamed polymer) ranging from 0.15 to 0.94 have been pr…
Detailed studies on the degradation reaction of electrochemically prepared polypyrrole have been conducted in an aqueous 1.0 M H 2 SO 4 solution by anodic oxidation of the polymer film at platinum electrodes, and the results are reported. The degree of degradation was followed by recording cyclic voltammograms of poly…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe (.mu.-oxo)bis[trichloroferrate(III)] dianion revisitedGabriele Haselhorst, Karl Wieghardt, Stefan Keller, and Bernhard SchraderCite this: Inorg. Chem. 1993, 32, 5, 520–525Publication Date (Print):March 1, 1993Publication History Published online1 May 2002Published inissu…
For the radiation force acting on a small bubble in a liquid medium in the presence of a plane standing sound wave, there has been a longstanding discrepancy between the prediction of Yosioka and Kawasima [Acustica 5, 167–173 (1955)], and that of Eller [J. Acoust. Soc. Am. 43, 170–171 (1968)]. It is concluded that the…
A process is described for producing gold black films with high absorptance in the far IR. The optical and electrical properties of these films have been studied with particular emphasis on the absorptance of films at wavelengths as long as 50 microm. A substantial decrease in absorptance near50 microm has been observ…
Coexistence of the Eu 2+ and Eu 3+ centers is confirmed for two kinds of CaO : Eu phosphors prepared in N 2 and H 2 by observing electron spin resonance (ESR) spectra, photoluminescence and optical excitation spectra and luminescence decay curves. The ESR signal intensity due to Eu 2+ in CaO : Eu prepared in H 2 was a…
In this paper we describe some of the recent literature on the contact charging (also known as tribocharging and contact electrification) of organic materials. Although it is a very familiar phenomenon, much remains to be understood about the mechanism of charging with organic materials. It has been proposed that the…
Four new hydrocarbon tetraradicals, 1-4, each composed of two triplet trimethylenemethane (TMM) subunits linked \nby a potential ferromagnetic coupling unit (FC), were synthesized and characterized by variable-temperature electron paramagnetic resonance (EPR) spectroscopy. Simulation of the EPR powder spectra and…
Technology for rapidly determining cotton fiber length distributions using single fiber measurements has been developed jointly by USDA-ARS and Schaffner Tech nologies (now Zellweger Uster, Inc.). The instrument (AFIS) includes a mechanism for mechanically opening a hand-fed ribbon of fibers so that individual fibers…
The crystal structure of calmodulin (CaM; M(r) 16,700, 148 residues) from the ciliated protozoan Paramecium tetraurelia (PCaM) has been determined and refined using 1.8 A resolution area detector data. The crystals are triclinic, space group P1, a = 29.66, b = 53.79, c = 25.49 A, alpha = 92.84, beta = 97.02, and gamma…
The many-body empirical potentials that describe atomic interactions in the copper-bismuth system were constructed using both experimental data and physical quantities obtained by ab initio full-potential linear muffin-tin orbital calculations for a metastable ${\mathrm{Cu}}_{3}$Bi compound. These potentials were then…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicrophase separation of block copolymer ringsJ. F. MarkoCite this: Macromolecules 1993, 26, 6, 1442–1444Publication Date (Print):March 1, 1993Publication History Published online1 May 2002Published inissue 1 March 1993https://pubs.acs.org/doi/10.1021/ma00058a038https://doi.…
Electrically conducting conjugated polymers such as polyaniline (PANi) usually show gel properties with volume changes in the range 1-100% in response to some external stimuli. The bending beam method provides an effective and sensitive way to detect and make use of these volume changes. Bipolymer laminate strips (2.5…
A computational model has been developed to calculate the potential and current distributions in the electrolyte phase and on the electrode surface for a system in which a part of the anode is passivated while the rest remains in the active dissolution state. The computation employs the finite element method allied wi…
A first principle mathematical model of the formation of calcareous deposits on a cathodically protected steel rotating disk electrode in seawater is presented. The model includes equations which transport phenomena, electrochemical reactions, precipitation reactions, and a homogeneous reaction involved in the formati…
Abstract By mixing Zntpp solid with o-chloranil, the rectification and photovoltaic properties of Al/porphyrin/Au sandwich-type cell are improved (Zntpp: 5, 10, 15, 20-tetraphenylporphyrinatozinc). The improvement may be mainly attributable to an increase in the hole concentration as the majority carrier because of th…
The sound velocities of the longitudinal and transverse vibrational modes in various directions have been measured by Brillouin scattering on high-quality twin-free single crystals of tetragonal PbTiO3. By using these velocities and the dielectric permittivity measured by the impedance method, a complete set of coeffi…