Materials Literature
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Abstract We investigated soil mineral weathering sequences in three geologically distinct high‐elevation areas of southern Appalachian spruce‐fir ( Picea rubens Sarg.‐ Abies fraseri [Pursh.] Poir) forests in order to elucidate the pedogenic factors that distinguish these unique soils from their low‐elevation counterpa…
Abstract α‐Methyleniedane (MI), a cyclic analog of α‐methylstyrene which does not undergo radical homopolymerization under standard conditions, was synthesized and subjected to radical, cationic, and anionic polymerizations. MI undergoes radical polymerization with α,α′‐azobis(isobutyronitrile) in contrast to α‐methyl…
The time evolution of Debye-Scherrer lines was investigated in metal-tritium-helium systems by neutron-scattering techniques. Polycrystalline samples of ${\mathrm{TaT}}_{\mathit{x}}$, ${\mathrm{YT}}_{\mathit{x}}$, and ${\mathrm{ScT}}_{\mathit{x}}$ were measured over a period of three years. The results show that heliu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical and spectroelectrochemical studies of tin(II) porphyrinsK. M. Kadish, D. Dubois, J. M. Barbe, and R. GuilardCite this: Inorg. Chem. 1991, 30, 24, 4498–4501Publication Date (Print):November 1, 1991Publication History Published online1 May 2002Published inissue…
The interface between a solid and a liquid or two dissimilar solids poses a resistance to heat transport by phonons, which are quanta of lattice vibrational energy. The classical theory explains that the resistance R arises due to a mismatch in acoustic impedances of the two media and predicts R to vary with temperatu…
The results of Molecular Dynamics simulations of borate glass (B2O3) using three-particle interactions are presented. These calculations yield a glass consisting of randomly connected BO3 triangles. Infrared and Raman spectra have been calculated and compared with experimental spectra. The calculated infrared spectra…
A discrete energy loss feature has been observed after adsorption of small amounts of potassium on graphite at 90 K, the frequency of which increases markedly from about 50 meV at the lowest potassium coverage to 320 meV at a coverage of 0.1 ML. This feature is attributed to a surface plasmon mode. The shift in plasmo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSET photochemistry of flavin-cyclopropylamine systems. Models for proposed monoamine oxidase inhibition mechanismsJong Man Kim, Michael A. Bogdan, and Patrick S. MarianoCite this: J. Am. Chem. Soc. 1991, 113, 24, 9251–9257Publication Date (Print):November 1, 1991Publication…
A dynamic peak-to-peak strain of 2440 p.p.m. has been measured at resonance in a Terfenol-D transducer which exceeds the 1600 p.p.m. static magnetostrain by 50%. This experimental result is in good agreement with theoretical calculation. It shows that static magnetostrain is not a real limit for dynamic strains at res…
Grain‐size distribution in various Al 2 O 3 ─ZrO 2 (2.5 mol% Y 2 O 3 ) ceramics during high‐temperature annealing was examined. In alumina‐rich alloys, the grain size of major and minor phases was very different, while grain size was almost uniform in zirconia‐rich alloys. This difference in grainsize distribution was…
The wall recombination coefficient (γ) of several materials for atomic oxygen was measured introducing a new method based on the NO*2 continuum in a discharge-flow system. This method has many advantages, such as the ability of measuring γ under different pressures, nonessentiality of measuring absolute atom concentra…
Films of polytetrafluoroethylene (PTFE) and perfluorinated copolymers (PFA and FEP), with a range of fabrication histories, were exposed to sodium naphthalenide (Na/naphth) etchant so as to defluorinate the surface for improved wettability, and hence adhesion. The depth of defluorination was measured gravimetrically a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermoreversible gelation via multichain junctionsWalter H. StockmayerCite this: Macromolecules 1991, 24, 23, 6367–6368Publication Date (Print):November 1, 1991Publication History Published online1 May 2002Published inissue 1 November 1991https://pubs.acs.org/doi/10.1021/ma0…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of temperature on the formation of photochemical ozone in a propene-nitrogen oxide (NOx)-air-irradiation systemShiro Hatakeyama, Hajime Akimoto, and Nobuaki WashidaCite this: Environ. Sci. Technol. 1991, 25, 11, 1884–1890Publication Date (Print):November 1, 1991Public…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudy of surface properties of clay laponite using pyrene as a photophysical probe moleculeXinsheng Liu and J. Kerry ThomasCite this: Langmuir 1991, 7, 11, 2808–2816Publication Date (Print):November 1, 1991Publication History Published online1 May 2002Published inissue 1 Nov…
Disk-like complexes, bis[l,2-di(3′,4′-di-n-alkylphenyl)ethane-l,2-dithiolene]nickel (n-alkyl = n-hexyl, n-octyl) and bis[1,2-di(3′,4′-di-n-decyloxyphenyl)ethane-1,2-dithiolene]nickel have been synthesized and characterized. It was found that n-decyloxy derivative exhibits a hexagonal disordered columnar (Dhd) mesophas…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSingle-crystal x-ray studies of aromatic oligomers: conformation and packing in isomeric pyromellitimide-ether-sulfonesCaroline A. O'Mahoney, David J. Williams, Howard M. Colquhoun, Richard Mayo, Stella M. Young, Ali Askari, John Kendrick, and Elizabeth RobsonCite this: Macr…
A series of bis(arene)technetium(I) complexes has been synthesized from 99mTcO4- in order to study their organ distribution. Syntheses using either ultrasound/Al/AlCl3 or Zn/HCl gave products relatively free from transalkylation. The identity of the complexes was verified by comparison to the 99Tc complexes. Equivalen…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemistry of five- and six-coordinate .sigma.-bonded cobalt porphyrins. Reactions of (TPP)Co(C2H5)(py) and (TPP)Co(R) where TPP is the dianion of tetraphenylporphyrin and R = CH3, C2H5, or CH2ClK. M. Kadish, B. C. Han, and A. EndoCite this: Inorg. Chem. 1991, 30, 24,…
SUMMARY This paper discusses some methods for the quantitative description of anisotropy of planar structures. These methods can be applied to systems of particles randomly distributed. It is also possible to detect anisotropics in particle arrangements. Finally, a simple Monte Carlo test of an isotropy hypothesis is…