Materials Literature
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Two basic models of the incommensurate (IC) structure of NaNO2, one with purely occupational modulation and one with mixed modulation, have been tested using (3 + 1)-dimensional space groups. The refinements were performed in the two superspace groups PI m_{\bar 1} ms m1 and PI 2s ms m1. The main feature of this IC st…
Some computed results of an energy method of analysis applied to single bar warp knitted structures (Part I) are presented. They are compared with experimental results and previous models of the warp knit structures in the literature. The single bar warp knit structures are characterized by a complex interlacing patte…
Abstract Polyacetylene (PA) deposited on a platinum surface is synthesized by electrochemical polymerization of acetylene in a cell with platinum strip as cathode, nickel strip as anode, and nickel bromide in acetonitrile as electrolyte. The electrolytic solution is presaturated with acetylene. The PA so produced has…
Low-energy electron energy loss spectra including secondary electron bands and low-energy electron transmission spectra were measured for polystyrene and poly(2-vinylpyridine) thin films deposited on metal substrates. Almost all the features of these spectra could be explained as the result of electronic excitations l…
Abstract Polypropylene (PP) compositions containing 0–20 vol % of steel fibers (SF) [neat or with 5 wt % of maleated propylene wax (MPP)] were prepared and tested for electrical and thermal conductivities. It was found that, at room temperature, the volume resistivity Ω v fell below 10 ohm cm at SF loading of about 10…
Abstract Steady state experiments and their interpretation were performed to explore the kinetics of CO oxidation over a supported Co 3 O 4 catalyst. The rate of reaction was found to depend on temperature and the partial pressure of oxygen but not on the partial pressure of carbon monoxide. It is shown that catalyst…
Abstract Small‐angle x‐ray scattering (SAXS) was used to study the structure along a single craze that had broken down to form a crack along part of its length. This study was made possible by use of radiation from the synchrotron source CHESS which is sufficiently intense to permit examination of just a single craze.…
Transmission electron microscopy has been used to characterize the microstructure and crystal structure of high energy product (14.1 MG.Oe) melt-spun Fe-Nd-B ribbons with an alloy composition of Nd13Fe82.6,B4.4. The microstructure of these ribbons consists of very fine grains, and they are practically single-phase mat…
Abstract Present-day marine sediments around the emerged basaltic areas of Iceland and the Faeroe Islands are characterized by the abundance and predominance of smectites. Smectites increase regularly and systematically near volcanic areas. Their origin from (i) meteoric/deuteric weathering, (ii) hydrothermal products…
Abstract An X-ray diffraction method has been successfully applied to the quantitative determination of mineral mixtures. The absorptive properties of the samples and the number of components determine the analytical procedure to be used. The methods described (external standard plus empirical determination of the mas…
Simultaneous Fourier transform infrared and stress-strain measurements have been applied to monitor the onset, progress, and decay of strain-induced crystallization during cyclic loading-unloading of sulfur-crosslinked natural rubber. The investigations also provided data in terms of the orientation of the average pol…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemistry and structure of the first 10-Sb-3 speciesConstantine A. Stewart, Richard L. Harlow, and Anthony J. Arduengo IIICite this: J. Am. Chem. Soc. 1985, 107, 19, 5543–5544Publication Date (Print):September 1, 1985Publication History Published online1 May 2002Published in…
The transformation‐range viscosity and thermal expansion be‐havior of sodium‐potassium borate glasses were studied. The results indicate that negative deviations from additivity in the viscosity of these glasses are a function of the Na 2 O to K 2 O ratio and that the magnitude of these deviations increases with alkal…
Fr\'eedericksz transition under twist deformation in a nematic layer is discussed when the magnetic field has a random component. A dynamical model which includes the thermal fluctuations of the system is presented. The randomness of the field produces a shift of the instability point. Beyond this instability point th…
Abstract Research was conducted to define appropriate compound loading conditions and energy parameters required to properly control and analyze fatigue crack propagation experiments for tire sidewall applications. The effects of strain level, pulse frequency, overall cycle frequency, sample thickness, and oven temper…
Synopsis Clay mineral logs for the Jurassic succession at Brora are presented as vertical profiles in lithostratigraphic units. The shale clay mineralogy is dominated by ordered illite/smectite and kaolinite. A sub-tropical, possibly seasonal, climate is inferred. High kaolinite content is attributed to reworking of p…
Abstract Supermolecular structure of linters cellulose at the cellulose I–II phase transition is investigated by wide‐angle X‐ray scattering (quantitative phase analysis, degree of crystallinity by the method of Ruland and Vonk, and lateral crystallite sizes via peak separation by Pearson VII functions). A survey of m…
Abstract The deformation of thin films of poly(1‐butene) (PB) occurs by micronecking. In both fresh (From II crystal structure) and aged (Form I) films finite blocks are drawn off the edge of the microneck, the detailed mechanisms depending on the orientation of the original crystalline ribbons comprising the spheruli…
Abstract A unique mineral association that represents embryonic stages of halloysite formation in weathering of andesitic volcanic ash was found in three Ecuadorian soils which did not contain allophane. This mineral association consisted of more or less poorly ordered halloysites and a “1.0‐nm mineral”. The more poor…
Abstract 1. Densities of elastomers with crystallizing soft segments were higher than that of the noncrystallizing ones. However, the effect of the soft segment length is not regular and may reflect some specific interactions between two phases as well as instantaneous morphology. 2. Phase inversion as judged by drop…