Materials Literature
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Abstract Poly( p ‐phenylene terephthalamide)(PTTA) films were prepared from sulfuric acid solution with various coagulants. X‐ray diffraction and infrared absorption measurements revealed that the crystal structure of the film coagulated with water showed a new crystal modification II, which was different from the one…
A literature survey was conducted to collect mineralogical data of Canadian soils. In the past 40 years, clay mineralogical data of varying precision have been reported for approximately 1200 samples from more than 380 pedons. Based on the data, (1) the distribution of clay minerals was examined physiographically, (2)…
M\"ossbauer, electron-micrography, and electron-diffraction studies were conducted on amorphous-tin-oxide samples prepared by reacting gaseous atomic tin with molecular oxygen and collecting the oxide on a 77-K substrate. The observed isomer shift, quadrupole splitting, and characteristic lattice temperatures deviate…
The complex index of refraction N=n−ik for amorphous SiO2 is derived in the energy range 0.03–1.0 eV by Kramers-Kronig analysis of reflectance data. The results are used to compute the transmission, reflectance, and absorptivity of thin layers of SiO2 on Si substrates in the vicinity of the 0.14-eV (9 μ) lattice absor…
The susceptibility of Cu-Ni alloys to accelerated corrosion in sea water containing low sulfide concentrations has been investigated. Test alloys included wrought 90/10 Cu-Ni, 70/30 Cu-Ni and Ni-Cu, plus cast 70/30 Cu-Ni. Sheet type specimen exposures were performed in fresh flowing sea water at a test velocity of 2.4…
Abstract— Methyl viologen was reduced by EDTA and other organic compounds when aqueous solutions of these compounds were irradiated near 440 nm in the presence of catalytic quantities of proflavin. The photoreduced methyl viologen was readily oxidized in the dark by the enzyme hydrogenase or platinum asbestos. When th…
Vibrational spectra and LEED structures of CO on the Ru(001) surface were measured as a function of coverage at 100 K. The LEED patterns indicate that CO occupies a variety of asymmetric sites at high coverage, while the vibrational spectra show a single Ru–C stretching frequency (445 cm−1) and a single C–O stretching…
The satellite reflections at ( h , 0, l ±(1/3-δ)) in Rb 2 ZnCl 4 and K 2 ZnCl 4 have been studied by neutron scattering. Incommensurate structures (δ≠0) were observed in temrerature ranges of +30^° C ∼-81^° C for Rb 2 ZnCl 4 and of +130^° C ∼+280^° C for K 2 ZnCl 4 . The temperature dependence of the parameter δ was o…
Existing theories for commensurate-incommensurate transitions in one-dimensionally-modulated systems show that these transitions are continuous and are associated with domainwall formation. We consider the effect of domain-wall crossing in two-dimensionally modulated systems with hexagonal symmetry such as rare-gas la…
Abstract A series of active β‐alanine 4‐acyl‐2‐nitrophenyl esters with different lengths of alkyl groups was prepared, and their polycondensation was studied in various solvents. The results of the polycondensation of these esters with triethylamine at room temperature show that the conversion and the degree of polyco…
Abstract The crystal structure of posnjakite (space group Pa , a = 10.578, b = 6.345, c = 7.863 Å, β = 117.98°) was determined by direct methods and refined to a final R value of 0.05. The structure is characterized by corrugated sheets of distorted copper octahedra with crystal chemical formula 2 ∞ Cu 4 (OH) 6 (H 2 O…
The transmission of phonons across an interface between a classical solid and liquid helium is calculated. Several simple models of the helium system are considered. Calculations for a solid with a clean and perfect surface give a transmission coefficient for low-energy phonons. ($\ensuremath{\epsilon}<20$ K), whic…
Abstract The interface between ZnO/Si and ZnO/SiO 2 was studied by etching through the junction region and analyzing XPS and Auger LMM spectra. By comparing XPS shifts and peak splitting in the Si2p spectra, chemical complexes of the form Si—O x —Zn ( x ≃1) were identified at the ZnO/Si interface. The transition from…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInterpretation of polymer properties in terms of chain conformations and spatial configurationsJames E. MarkCite this: Acc. Chem. Res. 1979, 12, 2, 49–55Publication Date (Print):February 1, 1979Publication History Published online1 May 2002Published inissue 1 February 1979ht…
<div class="htmlview paragraph">Recent developments of high performance ceramics have given a new impetus for the advancement of heat engines. The thermal efficiencies of the Otto, Diesel, Brayton and the Stirling cycle can now be improved by higher operating temperatures, reduced heat loss, and exhaust energy r…
<div class="htmlview paragraph">An experimental investigation was made to determine the effect of torch nozzle orientation on burn rate, power, fuel consumption and exhaust emissions. With the torch nozzle directed diametrically across the combustion chamber the burn rate and the power were maximized. Exhaust em…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and crystal and molecular structure of a tris(thiobenzoyldiazene)molybdenum complex: an example of distorted trigonal-prismatic coordinationJonathan R. Dilworth, J. Hyde, P. Lyford, P. Vella, K. Venkatasubramaman, and Jon A. ZubietaCite this: Inorg. Chem. 1979, 1…
Article A Thermodynamic Analysis of the Stress-Induced Martensitic Transformation in a Single Crystal was published on February 1, 1979 in the journal International Journal of Materials Research (volume 70, issue 2).
Abstract Metal-rich ternary chalcogenides M 3 M 2 ′X 2 (M = Ni, Co, Pd, Rh; M′ = In, Tl, Pb, Sn; X = S, Se) with Shandite-type structure were synthesized from mixtures of the elements and/or binary components. A single-crystal investigation on Co 3 ln 2 S 2 verifies the rhombohedral unit cell of Shandite-type compound…
Abstract Infrared and Mössbauer spectroscopy show that the extent of the reduction of nontronite is dependent on the chemical composition of the nontronite and on the nature of the reducing agent. Hydrazine reversibly reduces about 10% of the iron in all of the nontronites studied irrespective of composition and it is…