Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTModel calculations for the intensity parameters of nine-coordinate neodymium(III) and holmium(III) complexes of trigonal symmetryEileen M. Stephens, Michael F. Reid, and F. S. RichardsonCite this: Inorg. Chem. 1984, 23, 26, 4611–4618Publication Date (Print):December 1, 1984P…
The infrared spectra of the (1:1) charge transfer salt of N, N, N′, N ‘-tetramethyl-p-phenylendiamine (TMPD) with 7, 7, 8, 8-tetracyanoquinodimethane (TCNQ) and with fully deuterated TCNQ are reported. The assignment of the vibrational data is obtained on the basis of the comparison with that of neutral and ionized pa…
Abstract The 500 MHz proton NMR spectra of chlorophyll‐ a in several non‐aggregating solvents, at high dilution, are given and that of pheophytin‐ a in CDCl 3 at 360 MHz and at high dilution is reported. Under these conditions, the dispersion is such that separate resonances are observed and can be assigned for all pr…
Abstract The copolymerizations of acrylamide (AM) with N ‐(1,1‐dimethyl‐3‐oxybutyl)acrylamide (DAAM) and with N , N ‐dimethylacrylamide (DMAM) have been studied. The values of r 1 , r 2 have been determined to be 0.75 for the AM‐DAAM pair and 0.86 for the AM‐DMAM pair. The molecular weights of the copolymers were foun…
Copper appears to be a promising anode material for the molten carbonate fuel cell, as an alternative to nickel. Therefore, polarization data have been obtained for oxidation of fuel gases on a fully immersed copper rod. The electrode‐kinetic parameters have been determined using the potential‐step technique. The reac…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChain-folding initiation structures in ribonuclease A: conformational free energy calculations on Ac-Asn-Pro-Tyr-NHMe, Ac-Tyr-Pro-Asn-NHMe, and related peptidesM. Oka, G. T. Montelione, and H. A. ScheragaCite this: J. Am. Chem. Soc. 1984, 106, 25, 7946–7958Publication Date (…
Raman spectra of an oriented crystal of anhydrous Li2SO4 are reported in the temperature range 25–775 °C which includes the monoclinic-fcc phase transition at 575 °C. Qualitative differences in the general spectra in the two solid phases are discussed. A quantitative analysis has been carried out for the internal ν1 b…
Abstract Thermal behavior of drawn poly(ethylene terephthalate) (PET) multifilament yarn which had earlier been heat‐set at various temperatures between 100°C and 250°C under “free to relax” and “taut at constant length” conditions is studied by differential scanning calorimetric (DSC) measurements. Structural studies…
The dynamic mechanical property of the vitreous body was studied as functions of frequency and temperature. The data at different temperatures were found to be superposable onto a single set of master relaxation curves. It was found that the shape of the composite master relaxation curves of the vitreous body resemble…
Solid-state Si and Al NMR, using high-resolution techniques, have been used to examine the dehydroxylation of the 2:1 phyllosilicate mineral pyrophyllite. Si results are consistent with the maintenance of the 2:1 layer structure in the dehydroxylate phase and provide data on chemical shift/structure variation in sheet…
The crystallization of leucine aminopeptidase from hog kidney is reported for the first time. The crystals which diffract to 4-A resolution have the space group P2(1)2(1)2(1) (a = 186.3 A, b = 223.2 A, and c = 80.5 A) and contain four hexamers per unit cell, or one per asymmetric unit. Electron micrographic images of…
This paper reports an experimental study of a meandering water stream upon an inclined smooth hydrophobic surface. It was found that the sinuosity (ratio of the total stream length to the length of the projection of the stream on the line of maximum slope of the surface) increases with both increasing discharge rate a…
The crystallization of disordered surface layers on highly oriented pyrolytic graphite (HOPG) has been studied by Rutherford backscattering spectrometry and channeling techniques. Disordered layers (∼1000–3000 Å thick) are produced on the surface of HOPG by the implantation of various ions. The disordered layers are r…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLiquid-crystalline ordering in solutions of semiflexible macromolecules with rotational-isomeric flexibilityA. R. Khokhlov and A. N. SemenovCite this: Macromolecules 1984, 17, 12, 2678–2685Publication Date (Print):December 1, 1984Publication History Published online1 May 200…
Histidine enriched in 15N in the imidazole nitrogens was incorporated into the catalytic triad of alpha-lytic protease, and high-resolution solid-state 15N NMR spectra of lyophilized enzyme powders were recorded. The lyophilized powders were prepared from aqueous solutions with pH values ranging from 4.9 to 9.3. The b…
Abstract The previously reported method for the preparation of tri‐ O ‐benzylcellulose was applied to the preparation of various tri‐O‐substituted cellulose ethers. By this method, in which a mixture consisting of SO 2 , diethylamine (DEA), and dimethylsulfoxide (DMSO) and powdered sodium hydroxide were used as a cell…
Abstract The isothermal macrokinetic equation of polymer crystallization has been generalized to cover nonisothermal situations as well. The process of nonisothermal crystallization of poly(caproamide) has been studied experimentally. It is shown that the macrokinetic equation of the autocatalytic type can be used to…
Novel rechargeable battery cells have been constructed using a reduced form of the conducting organic polymer, polyacetylene, as the anode, the inorganic intercalating material, titanium disulfide as the cathode, and either 1.0 M LiClO 4 in THF or 1.0 M NaPF 6 in THF as the nonaqueous electrolyte. A feasibility study…
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Leakage currents in new and degraded (typically at twice rated voltage, 125°C) ZSU and X7R types Of multilayer ceramic (MLC) capacitors show both ohmic and space charge limited current behavior. The near 3/2 power voltage characteristic (la V3/2) of new devices can be attributed to electron emission from electrode poi…