Materials Literature
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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…
Phase equilibria in block copolymer (AB) + homopolymer (A) blends are considered theoretically in the strong segregation limit. The effect of homopolymer molecular weight is analyzed. In particular, the following are shown: (i) Long enough A-homopolymer chains (N(h) much greater than N(hc)) are incompatible with stret…
Abstract The self‐consistent method and finite element simulations have been used to estimate the permeability of an aligned fiber bundle. The self‐consistent method gives out formulas for both longitudinal and transverse permeabilities as functions of the fiber volume fraction. The finite element simulation presents…
Abstract The interaction of the herbicide 2,4‐dichlorophenoxyacetic acid (2,4‐D) with decylammonium‐montmorillonite (C10M) and decylammonium‐vermiculite (C10V) was studied by measuring 2,4‐D adsorption at different pH levels, and by preparing herbicide‐organic clay complexes which were characterized by x‐ray diffracti…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicrostructural and chemical properties of ceria-supported rhodium catalysts reduced at 773 KS. Bernal, F. J. Botana, J. J. Calvino, M. A. Cauqui, G. A. Cifredo, A. Jobacho, J. M. Pintado, and J. M. Rodriguez-IzquierdoCite this: J. Phys. Chem. 1993, 97, 16, 4118–4123Publicat…
Wheat starch granules and poly-(beta-hydroxybutyrate-co-beta-hydroxyvalerate) [P(HB-co-HV), (19.1 mol% HV)] were blended at 160 degrees C. Increasing the starch content from 0 to 50% (wt/wt) decreased the tensile strength of P(HB-co-HV) from 18 MPa to 8 MPa and diminished flexibility as Young's modulus increased from…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNickel carbonyl [Ni(CO)4] and iron carbonyl [Fe(CO)5]: molecular structures in the solid stateDario Braga, Fabrizia Grepioni, and A. Guy OrpenCite this: Organometallics 1993, 12, 4, 1481–1483Publication Date (Print):April 1, 1993Publication History Published online1 May 2002…
Reaction‐bonded Al 2 O 3 (RBAO) ceramics were fabricated starting from mechanically alloyed Al 2 O 3 /Al, Al 2 O 3 / Al/ZrO 2 , and Al 2 O 3 /Al/ZrO 2 /Zr mixtures. Isopressed compacts were heat‐treated in air up to 1550°C. Reaction‐bonding mechanisms, kinetics, and the influence of ZrO 2 and Zr additions are investig…
We recently found, using cultured mouse cell systems, that newly synthesized catalytic (C) subunits of cyclic AMP-dependent protein kinase undergo a posttranslational modification that reduces their electrophoretic mobilities in sodium dodecyl sulfate (SDS)-polyacrylamide gels and activates them for binding to a Sepha…
An unusual two-dimensional mesh of CuII ions is found in complex 1(see picture); the metal atoms are bridged by oxalato (ox) and bipyrimidine (bpym) ligands to form ringshaped hexamers. Variable-temperature magnetic susceptibility measurements indicate that antiferromagnetic coupling between the Cu atoms occurs.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAre the equilibrium concentrations of carbon monoxide and hydrogen exceeded during the oxidation of methane over a nickel/ytterbium oxide catalyst?Dhammike Dissanayake, Michael P. Rosynek, and Jack H. LunsfordCite this: J. Phys. Chem. 1993, 97, 15, 3644–3646Publication Date…