Materials Literature
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Very low transmission loss fiber optical waveguides have been developed during the past two years which have pure fused silica cores surrounded by borosilicate glass claddings. A recent study of the binary borosilicate glass system revealed that the low refractive index values which can be achieved with this glass and…
A new technique is presented for evaluating the electron Green function G k (t) in an insulating electron–phonon system. The technique is particularly suitable for those electron–phonon interactions in which the long wavelength phonons are of prime importance such as the polaron and piezoelectric interactions.An exact…
Calculations of the frequency and temperature dependence of infrared multiphonon absorption for the alkali halides and alkaline-earth flourides are compared with previously published data and some new results. The temperature dependence of the infrared absorption of pure crystals of NaF, NaCl, and KCl at 10.6 \ensurem…
The reflectivity and ${\ensuremath{\epsilon}}_{2}$ spectra of the fcc metals Rh, Pd, Ir, and Pt are reviewed and discussed between about 0.1 and 30 eV. Structures in ${\ensuremath{\epsilon}}_{2}$ are interpreted in terms of recent band calculations. Calculations of the joint density of states and ${\ensuremath{\epsilo…
Solutions have been obtained to equations which described the interface between two immiscible polymers and are more general than the equations first introduced by Helfand and Tagami. Gaussian random−walk statistics are assumed for the macromolecules. As a consequence of the present work, limitations of the earlier th…
Resistivity and Hall effect measurements have been made on ${\mathrm{Sm}}_{1\ensuremath{-}x}{\mathrm{Y}}_{x}\mathrm{S}$ alloys which exhibit black to gold phase transitions as a function of temperature and composition, similar to SmS under pressure. The results indicate that in the gold phase there is a virtual bound…
The structure factor of amorphous solid D(2)O deposited from the vapor at 10 degrees K has been obtained by measuring the neutron diffraction spectrum in the wave vector transfer from 0.8 to 12.3 reciprocal angstroms. The results indicate that the phase investigated is amorphous and has a liquiid-like structure factor…
We present numerical calculations based on a tight-binding model for the organic conductor tetrathiafulvalene tetracyanoquinodimethane (TTF-TCNQ). The model consists of anisotropic planar TTF and TCNQ bands coupled together by an interplanar transfer integral, which produces a nearly zero-bandgap semiconductor. The ca…
A large (50 mm long by 50 mm diam), clear, visually flawless, oriented single crystal of cerous zinc nitrate 24−hydrate (CZN) has been grown in a Teflon coated cylindrical Pyrex container at 30°C by evaporation of H2O from a saturated solution. The growth rate along the c crystal axis was 0.7 mm/day. The growth in the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUse of Infinite-Dilution Activity Coefficients for Predicting Azeotrope Formation at Constant Temperature and Partial Miscibility in Binary Liquid MixturesVincenzo BrandaniCite this: Ind. Eng. Chem. Fundamen. 1975, 14, 1, 73Publication Date (Print):February 1, 1975Publicatio…
Abstract Durch Kondensation von 2,3,7,8‐Tetraoxo‐2,3,7,8‐tetrahydropyrrolo[2′,3′:1,2]naphtho[5,6‐ b ] pyrrol ( 4 ) mit Thiophen entsteht ein polymeres Indopheninhomologes ( 2 ). 2 ist ein Küpenfarbstoff und besitzt auf Grund seines koplanaren konjugierten π‐Elektronensystems ausgeprägte Eigenschaften eines polymeren o…
A hydrogen glow discharge surface treatment followed by exposure to the atmosphere has been used to decrease the contact angle for distilled water on RTV-silicone. The change in contact angle has been studied in terms of vacuum ultraviolet irradiation, metastable bombardment, free-radical bombardment, and electrostati…
By a simple modification, the rheovibron can be used to measure the dynamic mechanical properties of polymeric samples in equilibrium with liquids. Recent studies have shown that liquids capable of specific strong interaction with polymers can cause crystallization to occur. To demonstrate the utility of the modified…
Abstract On the basis of the diagonalization of the complete Coulomb repulsion, ligand field, spin‐orbit interaction, and Zeeman effect matrices, the magnetic properties were calculated for the octahedral and tetrahedral d 2 and d 8 electron systems. In addition, the corresponding tetragonally and trigonally distorted…
Abstract Wettability plays an important role in a number of industrial applications. Often it becomes desirable to control contact angles (wettability). For this purpose, two techniques for altering the contact angles of glass beads are described. These involve chemisorption of Silicones or Hexamethyldisilazane (HMDS)…
ADVERTISEMENT RETURN TO ISSUEPREVArticleMisinterpretation of isobestic points. Ambident properties of imidazoleDennis V. StynesCite this: Inorg. Chem. 1975, 14, 2, 453–454Publication Date (Print):February 1, 1975Publication History Published online1 May 2002Published inissue 1 February 1975https://pubs.acs.org/doi/10.…
To provide engineering data useful in the design, manufacture, and operation of seamless pressure vessels, extensive tests have been conducted in hydrogen at pressures ranging from 3000 to 14,000 psi (21–97 MN/m2) with precracked specimens of steels having a wide range of mechanical properties. The critical stress-int…
Abstract Ein einfaches Calorimeter zur Bestimmung der Mischungsenthalpien von geschmolzenen Salzen bei höheren Temperaturen wurde konstruiert. Es wurden die Mischungsenthalpien innerhalb der Serie von Systemen MeClGdCl 3 (Me Alkalimetall) und der Serie NaClLnCl 3 (Ln Lanthanoidenelement) sowie der Systeme NaBrNdBr…
Abstract Brillouin light scattering has been used to measure the sound velocities in polystyrene of two different molecular weights. The variation of sound velocity with temperature is related to volumetric expansion of the polymer. Using the thermal expansion data of Fox and Flory we have determined the Grüneisen num…
The corrosion resistance of various Ti-Ru alloys (0.07 to 0.55 Wt% Ru) has been evaluated and compared with published data on Ti-Pd alloys. The results show that Ti-Ru alloys (1) are comparable with Ti-Pd alloys in terms of corrosion resistance in dilute (0 to 10%) boiling H2SO4 solutions, and are only slightly inferi…