Materials Literature
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This paper presents a synthesis of data from X-ray diffraction analyses of clay minerals and X-ray fluorescence analyses of bulk mudstones from Ocean Drilling Program Site 808. The samples come from three closely spaced holes drilled through the toe of the Nankai accretionary prism offshore Shikoku, Japan. Detrital as…
The internal structure of water trees is examined in detail, particularly the nonuniformity of their internal structure. The quantitative space distribution of bouquets and microcavities is given. Based on the fact that the water tree is composed of a number of microcavities filled with liquid, the authors analyze the…
Structural investigations of copper and nickel complexes of dodecasubstituted porphyrins bearing aryl groups at the meso positions and propano rings at the pyrrole β positions reveal considerable differences in their macrocycle conformations. While the nickel complex NiTC5T(3,4,5-OMeP)P was found to exhibit a nonplana…
Sputter‐deposited Al‐W alloys exhibit considerably enhanced resistance to pitting corrosion over a range of pHs extending from pH 0 to 9.6. Surface analysis showed that although very little oxidized W is found in the passive film at near‐neutral pHs, at pH 3 there are comparable amounts of oxidized W and Al. A review…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAlkaplanes: a class of neutral hydrocarbons containing a potentially planar tetracoordinate carbonMark P. McGrath and Leo RadomCite this: J. Am. Chem. Soc. 1993, 115, 8, 3320–3321Publication Date (Print):April 1, 1993Publication History Published online1 May 2002Published in…
Computer codes being developed to improve the understanding of crossed-field amplifier (CFA) performance require a more complete and reliable database of the secondary electron emission properties of the electrode materials than exists in the literature. The authors describe an experimental method and present results…
We report strong dependencies of electron-spin-resonance (ESR) signals in fused silica on x-ray dose, sample hydroxyl concentration [OH], and preirradiation sample-annealing temperature ${\mathit{T}}_{\mathit{F}}$. In general, the strengths of the E'-center ESR signal and the two oxgyen-hole-center signals increase no…
Abstract Liquid crystalline polyurethanes were prepared from 4,4′‐bis(2‐hydroxyethoxy)biphenyl (BHBP) and 2,4‐tolylene diisocyanate (TDI). The effect of partial replacement of BHBP by 25–75 mol % poly(oxytetramethylene) diol (PTMO, M n = 250) on the liquid crystalline properties was studied. The BHBP/TDI/PTMO polyuret…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolvent-free cation-conducting polysiloxane electrolytes with pendant oligo(oxyethylene) and sulfonate groupsGuang Bin Zhou, Ishrat M. Khan, and Johannes SmidCite this: Macromolecules 1993, 26, 9, 2202–2208Publication Date (Print):April 1, 1993Publication History Published o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure/properties of conjugated conductive polymers. 2. 3-Ether-substituted polythiophenes and poly(4-methylthiophenes)Show An Chen and Chang Chih TsaiCite this: Macromolecules 1993, 26, 9, 2234–2239Publication Date (Print):April 1, 1993Publication History Published onlin…
This letter shows that the displacive phase transformation from the h.c.p. α-phase to the hexagonal co-phase can be triggered in titanium targets in an unusual way during swift heavy ion irradiations. This unexpected result is a consequence of the high level of energy deposition in electronic excitation. A model based…
Encapsulation of an optically nonlinear octupolar guanidinium cation in a host polyanionic L-monohydrogentartrate lattice leads to a noncentrosymmetric orthorhombic P2 1 2 1 2 1 guest-host crystalline structure with cell parameters a=11.347 (2), b=11.162 (2), c=6.668 (2) A with Z=4. Final R=0.049 from 1229 independent…
The nonlinear susceptibility of acetonitrile has been measured in both the gas and liquid phases by dc electric field-induced second harmonic generation (dc-SHG or EFISH). The EFISH signal for this molecule is dominated by the first hyperpolarizability β. It is shown that local field factors do not adequately describe…
In vitro [beta]-glucan products were synthesized by digitonin-solubilized enzyme preparations from plasma membrane-enriched fractions of cotton (Gossypium hirsutum) fiber cells. The reaction mixture favoring [beta]-1,4-glucan synthesis included the following effectors: Mg2+, Ca2+, cellobiose, cyclic-3[prime]:5[prime]-…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTControl of intramolecular electron transfer by protonation: oligomers of ruthenium porphyrins bridged by 4,4'-azopyridineValerie Marvaud and Jean Pierre LaunayCite this: Inorg. Chem. 1993, 32, 8, 1376–1382Publication Date (Print):April 1, 1993Publication History Published on…
An electrophoretic deposition and sintering route was used to prepare YSZ/Al 2 O 3 composites with a compositional gradient. The YSZ content was continuously decreased from the YSZ‐rich surface to the Al 2 O 3 ‐rich surface, Microstructural and Vickers hardness (16–24 GPa) evidence tracked the compositional developmen…
Abstract The anisotropy of the electronic interband transitions of β‐rhombohedral boron is determined by optical absorption measurements. The band gaps (indirect allowed transitions) are 1.32(1) and 1.50(1) eV for E ∥ c , respectively, 1.29(1) and 1.46(1) eV for E ⟂ c (extrapolated to T = 0 K). At low temperatures the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of lithium, sodium, and potassium porphyrin complexes. X-ray crystal structures of Li2(C6H12O2)2TMPP, Na2(THF)4OEP, and K2(pyridine)4OEPJohn Arnold, Denisha Y. Dawson, and Caroline G. HoffmanCite this: J. Am. Chem. Soc. 1993, 115, 7, 2707–2713P…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrothermal synthesis, structure, and sorption properties of the new microporous ferric molybdenum phosphates [(CH3)4N]2(NH4)2[Fe2Mo12O30(H2PO4)6(HPO4)2].nH2O and [(CH3)4N]2Na4[Fe3Mo12O30(HxPO4)8].nH2OLinda A. Meyer and Robert C. HaushalterCite this: Inorg. Chem. 1993, 32,…
An accelerated electromigration life‐test method has been developed to evaluate the large electromigration resistance of Cu interconnects in a very short period of test time. The essence of the acceleration technique employed here is to use stress current more than 10 7 A/cm 2 and to utilize the self‐heating of the te…