Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDilation of polymers by sorption of carbon dioxide at elevated pressures. 1. Silicone rubber and unconditioned polycarbonateG. K. Fleming and W. J. KorosCite this: Macromolecules 1986, 19, 8, 2285–2291Publication Date (Print):August 1, 1986Publication History Published onlin…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrdered bicontinuous double-diamond structure of star block copolymers: a new equilibrium microdomain morphologyEdwin L. Thomas, David B. Alward, David J. Kinning, David C. Martin, Dale L. Handlin Jr., and Lewis J. FettersCite this: Macromolecules 1986, 19, 8, 2197–2202Publi…
We have measured the frequency-dependent specific heat of glycerol and propylene glycol near the glass transition. The measurements, covering a frequency range of five decades, probe the linear response of these supercooled liquids to small perturbations from equilibrium. The specific heat of these two liquids contain…
Metallic conductivity that increases continuously up to 1.3 K and achieves values of over 500000 S cm−1 is exhibited by single crystals of the radical-anion salt depicted here, which was prepared by electrocrystallization. The multidimensional electronic conductivity is discussed on the basis of the crystal structure.…
Abstract High–quality Raman spectra of orthorhombic sulfur (S 8 ) have been recorded at 40 K employing multiscanning conditions. Assignments are proposed for the many new features detected, especially binary and ternary overtones and combinations of the SS stretching and SSS bending vibrations. The anharmonicities…
Gallium is a metal that literally melts in your hand. It has low toxicity, near-zero vapor pressure, and a viscosity similar to water. Despite possessing a surface tension larger than any other liquid (near room temperature), gallium can form nonspherical ...Read More
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface-enhanced Raman spectroscopy of amino acids and nucleotide bases adsorbed on silverJ. S. Suh and M. MoskovitsCite this: J. Am. Chem. Soc. 1986, 108, 16, 4711–4718Publication Date (Print):August 1, 1986Publication History Published online1 May 2002Published inissue 1 A…
A detailed experimental study has been made to clarify the mechanism of impulsive pressure generation from a single bubble collapsing in a static fluid – this is the most essential and important research task concerned with cavitation damage. First, the general feature of impulsive pressure generation is discussed, an…
The different magnetic phases of the bcc and fcc forms of Fe, Co, and Ni are studied by analyzing total-energy surfaces in moment-volume parameter space obtained from energy-band calculations using a local-spin-density approximation. The surfaces, found by calculating total energies while holding both the magnetic mom…
The 31P NMR spectra of 15N-labelled cyclophosphazenes contain additional information compared with the unlabelled compounds, namely, apart from the spin–spin coupling constant JPN, it is also possible to obtain information, in the case of homosubstituted compounds, about the spin–spin coupling constants JPP and JNN. T…
Abstract High-level wastes (HLW) can be incorporated in the crystal lattices of coexisting phases in ceramic waste forms. The properties and performances of ceramic waste forms are largely determined by their phase chemistry, phase assemblage and microstructure. Currently, the best categorized advanced ceramic waste f…
Abstract The title compound 1 , {[Fe(H 2 pztc)(H 2 O) 2 ] · 2 H 2 O} ∞ , has been prepared from pyrazinetetracarboxylic acid (H 4 pztc) and Fe(II) salt in H 2 O. It crystallizes in the monoclinic space group P 2 1 / a with cell parameters a = 13.56(1) Å, b = 7.17(1) Å, c = 6.48(1) Å, β = 101.0(2)°, V = 618.4 Å 3 . The…
Abstract A new, accurate, low‐temperature X‐ray analysis of lithium tetrafluoroberyllate, Li 2 BeF 4 , reveals that the charge density in this crystal is better represented as a superposition of spherical neutral‐atom charge distributions than as a superposition of ionic charges. The two distributions are so similar t…
Photoinduced crystallization is investigated by Raman scattering in Ge${\mathrm{Se}}_{2}$ and Si${\mathrm{Se}}_{2}$ glasses. Crystallization into two different structures is observed according as the incident laser power is above or below the threshold. To interpret it a new stochastic random-network model composed of…
We adopt the view that the structure of disordered systems is itself determined by the formation energy of structural deviations from an ideally bonded network. By developing an equilibrium statistical mechanical model for disorder we predict properties of electronic band tails, defects, defect densities of states, an…
A theory is presented in which much of the structure of spiral galaxies arises from a percolation phase transition that underlies the phenomenon of propagating star formation. According to this view, the appearance of spiral arms is a consequence of the differential rotation of the galaxy and the characteristic diverg…
Abstract The luminescence efficiency of the YAG:Tb phosphor (yttrium aluminium garnet, Y 3 Al 5 O 12 ) has been improved by the application of BaF 2 flux to the firing process.
Transmission-electron microscopy of chiral 4-(2-methylpentylphenyl)-4\ensuremath{'}-hexyloxybenzoate (CE4) quenched from its cholesteric and blue phases (BP) I and III are presented. Images of cholesteric and BP I are consistent with an earlier study of similar compounds. CE4 quenched from its BP III is a spaghettilik…
Nonequilibrium periodic textures are induced by a magnetic field $H$ applied to the aligned uniaxial (negative diamagnetic anisotropy) lyotropic nematic phase of the potassium laurate-decanol-water system. Two cases are studied: a rotating field and a static field. For the rotating field a transient one-dimensional st…
We study the plasma excitations of an array of two-dimensional electron-gas layers arranged in a Fibonacci sequence. The plasmon spectrum is analyzed by a transfer-matrix method. It is shown that the spectrum is always "critical," i.e., it corresponds to neither extended nor localized plasmon states. This property is…