Materials Literature
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The carbon-13 chemical shifts of several substituted nitrosobenzenes are reported. It is shown that the NO group can be orientated to lie in the plane of the ring when constrained either by a bulky ortho substituent or in the solid state. In the presence of 2,6-di-tert-butyl substituents the NO group is twisted into o…
Dy<sup>3+</sup> single ions in Cs<sub>3</sub>Y<sub>2</sub>Br<sub>9</sub> and Dy<sup>3+</sup>‒Dy<sup>3+</sup> dimers in Cs<sub>3</sub>Dy<sub>2</sub>Br<sub>9</sub> were studied by optical spectroscopy and by inelastic neutron scattering (INS). In the diluted compound the energy level scheme for the eight crystal electri…
Collagen type I was purified from equine skin and flexor tendon, and type II collagen was purified from equine articular cartilage. The proteoglycans in these tissues were extracted, using guanidine HCl; the collagens were solubilized, using pepsin digestion, then were selectively precipitated with NaCl. Gel electroph…
Abstract The effect of three different compatibilizers — ethylene methylacrylate copolymer (EMA), ethylene vinyl acetate copolymer (EVA), and silane grafted polyethylene (VMX) — on the physical properties, ageing behavior, thermal stability, morphology, and dynamic mechanical properties of a 50/50 blend of silicone/EP…
Abstract Material property models for poly(etheretherketone) (PEEK) have been combined with a residual stress model to provide a means for investigating the effect of crystallization process on the residual stress development in semicrystalline materials. The analysis shows that crystallization causes an increase in t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of Surface Charge of 4-Aminothiophenol-Modified PbS Microcrystal Photocatalysts on Photoinduced Charge TransferTsukasa Torimoto, Takao Sakata, Hirotaro Mori, and Hiroshi YoneyamaCite this: J. Phys. Chem. 1994, 98, 11, 3036–3043Publication Date (Print):March 1, 1994Pub…
Abstract Although fatigue tests at varied temperatures are not common due to the added burden of testing, there are times when variable temperature testing is important to ensure that rubber compounds will be suitable for the full range of use conditions. This is particularly true when materials with high T g (>−50…
The ability of Preisach-type scalar models to describe static and dynamic hysteresis properties is discussed. Three aspects are addressed in particular: the description of reversible magnetization processes, the characterization of magnetic interactions, and the calculation of dynamic hysteresis loops. Applications of…
The microcrystalline ferromagnetic compound Ni 2 MnGa was prepared by the melt-spinning method in the form of a ribbon. Characterization of the structural state and the martensitic transformation was carried out by various physical methods. The ribbon demonstrated a perfect shape memory effect and a two-way shape memo…
Thermal shock data are presented for two types of Al/Al 2 O 3 composites (35 vol% Al) with different microstructural scale and compared to a monolithic alumina. The fine‐scale Al/A1 2 O 3 material exhibits high room‐temperature strength (765 MPa) and a gradual decrease in retained strength with increasing quenching te…
The authors calculated values for the ratios of the double-electron to main-line strengths with their corresponding excitation energies for the ${\mathit{LN}}_{4,5}$ edges of elements found in the sixth row of the Periodic Table. In addition, the approximate analytical forms for the relative intensities in terms of mo…
Abstract The <2 µm fraction from the eluvial horizon of a humus-iron podzol is composed predominantly of a dioctahedral mineral with a basal spacing of 14.7 Å which contracts to 13.7 Å on solvation with glycol, and to 11.4 Å on heating to 300°C. The interlayer region is partially filled with an amorphous organo-Fe-…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVarious Adsorption States of 2-Mercaptobenzimidazole on the Surfaces of Gold and Silver Studied by Surface Enhanced Raman ScatteringGi Xue and Yun LuCite this: Langmuir 1994, 10, 3, 967–969Publication Date (Print):March 1, 1994Publication History Published online1 May 2002Pu…
The eex gene(s) of pKM101, which mediates that plasmid's entry exclusion phenotype, is located within a cluster of tra genes that are thought to encode a mating bridge. We have determined the DNA sequence of the region containing eex, including the points of insertion of two flanking tra::Tn5 insertions. Sequence anal…
A theory of ionic transport in polymer electrolytes is presented based on ionic environments reorganizing randomly into one another. This differs from previous work by allowing for Langevin like motion rather than instantaneous hops, by including possible carrier motion attached to moving segments, and by providing fo…
It is noted that when details are correctly designed and specifications are properly prepared and complied with, the repair process will possess properties that will be serviceable and durable. The paper delineates some of the major issues to consider in achieving long-lasting concrete repairs. Comments are made on th…
A vibrational technique for the measurement of stress in films has been developed, based on the theory of membranes. Specimens for vibrational analysis are prepared by removing a circular or square piece of the substrate. It is shown that the error introduced due to substrate removal is negligible except for thin meta…
Polyoxometalates are soluble mineral compounds formed principally of oxide anions and early transition metal cations. The polyoxometalates K12H2[P2W12O48].24H2O (JM 1591), K10[P2W18Zn4(H2O)2O68].20H2O (JM 1596), and [(CH3)3NH]8[Si2W18Nb6O77] (JM 2820) demonstrate potent antiviral activity against human immunodeficienc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSelf-Condensation of Cyclohexanone Catalyzed by Amberlyst-15. Study of Diffusional Resistances and Deactivation of the CatalystJose M. Aragon, Jesus M. R. Vegas, and Luis G. JodraCite this: Ind. Eng. Chem. Res. 1994, 33, 3, 592–599Publication Date (Print):March 1, 1994Public…
Some aspects of physico-chemical behaviour of thermotropic liquid-crystalline (LC) polymers with mesogenic side groups (comb-shaped polymers) are considered in connection with the peculiarities of their molecular structure. The relationship between molecular parameters, such as molecular weight and molecular weight di…