Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanism of the chromium-catalyzed epoxidation of olefins. Role of oxochromium(V) cationsE. G. Samsel, K. Srinivasan, and Jay K. KochiCite this: J. Am. Chem. Soc. 1985, 107, 25, 7606–7617Publication Date (Print):December 1, 1985Publication History Published online1 May 2002…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTToward an ab initio derivation of crystal morphologyZiva Berkovitch-YellinCite this: J. Am. Chem. Soc. 1985, 107, 26, 8239–8253Publication Date (Print):December 1, 1985Publication History Published online1 May 2002Published inissue 1 December 1985https://pubs.acs.org/doi/10.…
The physical principles underlying the oscillatory behavior of minute gas bubbles in liquids exposed to ultrasound are reviewed. Results from mathematical analyses suggest that these oscillations sometimes become unstable leading to transient cavitation in which a bubble violently collapses during a single acoustic ha…
The tetradentate copper(I1) Schiff base complexes CuHAPen and CuSALen react with Gd(C10)4)3 to yield crystalline materials of formula [(CUHAP~~)~G~(H~O)~](C~O,)(I~) .anZdC [U(HCAUPS~A~L ~~)~G~(H,O)~](C~O~)~.~CUSAL~~. 0.5CzH5N02 (II), respectively. Their crystal structures were determined through X-ray diffraction at r…
This paper reviews the flow behavior of concentrated suspensions as may be of interest in the processing of composites and similar polymeric materials. Succinct synopses are arranged at the end of each section. In general, the state of the art is a good one: a small number of experiments on a new formulation frequentl…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolution studies of cellulose in lithium chloride and N,N-dimethylacetamideCharles L. McCormick, Peter A. Callais, and Brewer H. Hutchinson Jr.Cite this: Macromolecules 1985, 18, 12, 2394–2401Publication Date (Print):December 1, 1985Publication History Published online1 May…
Abstract “Hydrothermal synthesis” usually refers to heterogeneous reactions in aqueous media above 100°C and 1 bar. The previously common distinction between hydrothermal conditions below and pneumatolytic conditions above the critical point is no longer made, since no discontinuities are observed upon exceeding the c…
The method of graphical analysis for the evaluation of sequential data (e.g., tissue and blood concentrations over time) in which the test substance is irreversibly trapped in the system has been expanded. A simpler derivation of the original analysis is presented. General equations are derived that can be used to ana…
We consider a new type of nonradiative transitions in nonmetallic solids. The transitions are not accompanied by heat release but by large (compared with interatomic distances) displacements of individual atoms. These instabilities (electrostatic, vibronic, structural), which lead to formation of defects in solid crys…
We have used solution small-angle X-ray scattering to characterize bovine brain calmodulin in the presence and absence of calcium. In the presence of calcium, calmodulin exists in solution as an elongated molecule with a radius of gyration of 21.5 A and a maximum vector length of approximately 62 A. These values are c…
The existence of large-sized satellite faces on crystals of the mineral calaverite (${\mathrm{Au}}_{1\ensuremath{-}x}{\mathrm{Ag}}_{x}{\mathrm{Te}}_{2}$) is reported. These anomalous high-index faces can be related directly to the wave vector q of the displacive incommensurate modulation recently found in the crystal…
The effect of high magnetic fields on the electronic structure of very anisotropic systems with charge- or spin-density waves is examined. In materials where there is lack of perfect nesting at the Fermi surface the density wave produces small electron and hole pockets. Calculations show that the presence of a high ma…
Diffuse low-energy-electron diffraction measurements at 46 eV for a disordered O/W(100) surface at 120 K have been interpreted by theory to give the local geometry of the oxygen atoms. This first application of the technique shows that phonon scattering does not prevent interpretation of data, and demonstrates sensiti…
We observe for the first time the transformation of glassy alloys (${\mathrm{Pd}}_{100\ensuremath{-}x\ensuremath{-}y}{\mathrm{U}}_{x}{\mathrm{Si}}_{y}$, $x\ensuremath{\simeq}y\ensuremath{\simeq}20$ at.%) into a metastable icosahedral phase with quasicrystalline order upon annealing. The icosahedral symmetry of the lat…
Experimental results are given on the incommensurate phase and on related phasetransitions in barium sodium niobate obtained by means of electron diffraction and electron microscopy. Evidence is found for discommensurations (DC) in the quasicommensurate phase of barium sodium niobate with detailed observations. A crys…
The changes in the dielectric constant ( ε ) of a single crystal of KTaO 3 and of a ceramic plate of SrTiO 3 were measured at 4.2 and 20.4 K in magnetic fields up to 15 T to examine recent vibronic-theory predictions. It is found that these changes are orders of magnitude smaller than predicted and are of opposite sig…
Oxidation studies of copper films at room temperature have been carried out by measuring the ATR spectra involving information about surface plasmon polariton characteristics. Oxidation is initially rapid, but after 10 to 20 minutes, drops to a negligible value, a stable film being formed ∼2.7 nm thick. It has been fu…
We report the first lattice-dynamical study of ${\mathrm{V}}_{2}$${\mathrm{O}}_{3}$ and (${\mathrm{V}}_{0.985}$${\mathrm{Cr}}_{0.015}$${)}_{2}$O $_{3}$ in the long-wavelength limit using a rigid-ion model with an effective ionic charge and various short-range interactions. The parameters of the model were determined f…
A multiple-scattering calculation of the neutron refractive index is performed by an extension of the Fermi-Huygens technique. The extension involves projecting the problem into a one-dimensional walk by integrating out the transverse coordinate in a semi-infinite medium and then partially summing parts of the walk to…
A new class of crystalline structures for group-IV materials is proposed. The basic building block for all the new structures is a two-dimensionally ordered slab of atoms which can be stacked together in several distinct ways. The most stable structure obtained in this way has a 20-atom orthorhombic unit cell. For Si,…