Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structure and magnetic susceptibility of a hydrocarbon free radical: tris(3,5-di-tert-butylphenyl)methylBart Kahr, Donna Van Engen, and Prakash GopalanCite this: Chem. Mater. 1993, 5, 5, 729–732Publication Date (Print):May 1, 1993Publication History Published online1…
The effect of humidity on the physicochemical properties of nitrofurantoin anhydrate and monohydrate during grinding in a humidity-controlled system was investigated using X-ray diffraction analysis, IR spectroscopy, thermal analysis and scanning electron microscopy. Anhydrate and monohydrate were transformed into a n…
Abstract Fatigue behavior in a blend of natural rubber (NR) and polybutadiene rubber (BR) has been investigated. The energy release rates measured from load-displacement curves recorded during the fatigue test could be used to characterize the fatigue crack propagation (FCP) history of NR/BR blend. Crack propagation k…
Abstract The well‐known Frenkel‐Kontorova theoretical model is generalized by including the elastic properties of the three‐dimensional medium surrounding the discrete atomic chain considered. The generalized sinuse‐Gordon equation (SGE) and the integro‐differential equation describing the crowdion in a highly anisotr…
The high‐temperature flexural strength of hot‐pressed silicon nitride (Si 3 N 4 ) and Si 3 N 4 ‐whisker‐reinforced Si 3 N 4 ‐matrix composites has been measured at a crosshead speed of 1.27 mm/min and temperatures up to 1400°C in a nitrogen atmosphere. Load–displacement curves for whisker‐reinforced composites showed…
We have described the synthesis of a variety of 1,3,1,4, and 1,5 donor-acceptor conjugation extended substituted pyrazole derivatives and have studied their spectr6scopic and nonlinear optical properties. These materials are thermally stable and absorb strongly in the UV-visible\nregion, albeit at much shorter wavelen…
Crystalline resorcinol [${\mathrm{C}}_{6}$${\mathrm{H}}_{4}$(OH${)}_{2}$] has been shown to amorphize at 40 kbars, solely using Raman scattering. The external modes vanish resulting in a spectrum similar to the density of states spectrum, but the internal modes persist indicating a breakdown of translational and orien…
Electron-paramagnetic-resonance (EPR) spectra of single crystals of a solid-state-laser material, manganese-doped ${\mathrm{Ba}}_{3}$(${\mathrm{VO}}_{4}$${)}_{2}$, are reported. The spectra reveal the incorporation of the putative active ion ${\mathrm{Mn}}^{5+}$ substituting for the tetrahedral coordinate ${\mathrm{V}…
We have designed and constructed a sealed, temperature-controlled Couette-type shear cell which allows us to carry out in situ synchrotron x-ray scattering studies of the nonequilibrium structures of complex fluids under flow, probing lengths ranging from the nanometer to the semimacroscopic micron scale. The sealed d…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCellulose acetate propionate and poly(tetramethylene glutarate) blendsCharles M. Buchanan, Steve C. Gedon, Alan W. White, and Matthew D. WoodCite this: Macromolecules 1993, 26, 11, 2963–2967Publication Date (Print):May 1, 1993Publication History Published online1 May 2002Pub…
The Cooperative Research and Development Agreement (CRADA), established to study the production and mitigation of S/sub 2/F/sub 10/ (disulfur decafluoride), one of a number of toxic by-products formed in electric discharges in the insulating gas SF/sub 6/, is described. The particular concern about S/sub 2/F/sub 10/ i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBis(dimethylviolurato)(phenanthroline)cobalt(II), a low-spin octahedral cobalt(II) complex. Crystal structure of [Co(dmvi)2phen].2CHCl3Juan Faus, Miguel Julve, Francisco Lloret, and M. Carmen MunozCite this: Inorg. Chem. 1993, 32, 10, 2013–2017Publication Date (Print):May 1,…
Summary The determination of lattice orientations from electron back‐scattering patterns (EBSPs) in a scanning electron microscope (SEM) requires accurate knowledge of the position of the pattern centre and the source point to screen distance. This paper outlines a new procedure that enables the determination of these…
Etching of thick copper foil masked except for a single rectangular opening having an aspect ratio (width:depth) of 5:1 or 1:1 was investigated in the presence of controlled laminar flow across the width of the pattern opening. In a solution of , copper was found to form a surface film spontaneously at the "corrosion…
A thermionic transient analysis model is developed to simulate transient and steady-state operations of a fully integrated, single-cell thermionic fuel element (TFE). The responses of the TFE to a step input in reactivity and changes in the cesium pressure or in the size of the interelectrode gap, the coolant temperat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and structural characterization of the [AuTe7]3- anion: a planar species with an unprecedented coordination modeMohammad A. Ansari, John C. Bollinger, and James A. IbersCite this: J. Am. Chem. Soc. 1993, 115, 9, 3838–3839Publication Date (Print):May 1, 1993Publicat…
Abstract The state of the art of photosensitive polyimides is reviewed with respect to the incorporation of photosensitivity into both polyimide precursors and soluble polyimides, for patterning in positive and negative modes. This paper emphasizes, in particular, the discussion of the performance of commercially avai…
High-resolution electron energy loss spectroscopy has been used to investigate the effect of atomic hydrogen and oxygen on diamond growth. For a totally desorbed diamond (100) surface, atomic hydrogen corrodes carbon atoms on the surface first, then saturates the dangling bonds of sp3 hybridized carbon atoms on the ne…
The three-dimensional integration of the Biot-Savart law for conductors in annular sector shape, in which only a constant-density theta -directed current flows, is reported. The expressions obtained allow a quick and accurate evaluation of the components of the vector potential of the stationary magnetic field and of…
The spectral and electrochemical properties of tetrabenzo[5,10,15]triazaporphine (TBTAP) and its magnesium derivatives having a long alkyl chain attached to the meso carbon have been studied. Both metal-free and metallated species show typical metal-free phthalocyanine-like spectra. Two reduction and two oxidation red…