Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProbing the influence of local coordination environment on ligand binding in nickel hydrogenase model complexesMikyung Cha, Christine L. Gatlin, Susan C. Critchlow, and Julie A. KovacsCite this: Inorg. Chem. 1993, 32, 25, 5868–5877Publication Date (Print):December 1, 1993Pub…
Abstract Changes in properties of PVC compounds upon weathering are categorized as due to physical aging or due to chemical change. PVC's tensile strength, flexural strength, tensile modulus, and flexural modulus generally rise slightly with weathering. DSC data on weathered samples show an annealing effect identical…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSupramolecular photochemistry of crystalline host-guest assemblies: absolute asymmetric photorearrangement of the host componentTai Y. Fu, Zhaoqing Liu, John R. Scheffer, and James TrotterCite this: J. Am. Chem. Soc. 1993, 115, 25, 12202–12203Publication Date (Print):Decembe…
Neutron-scattering techniques have been used to study the premartensitic state of a family of Cu-Al-Be alloys, which transform from the bcc phase to an 18R martensitic structure. We find that the phonon modes of the ${\mathrm{TA}}_{2}$[110] branch have very low energies with anomalous temperature dependence. A slight…
An extension of the modified weighted-density approximation (MWDA) is presented which retains the key features of the original MWDA in that it continues to describe the nonuniform system through the use of low-order correlation functions of the uniform counterpart. However, the approximate free energy functional is no…
Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text J. Larry Pezzaniti, Stephen C. McClain, Russell A. Chipman, and Shih-Yau Lu, "Depolarization in liquid-crystal televisions," Opt. Lett. 18, 2071-2073 (…
Abstract Reversed brackets on As and Sb partitioning between tetrahedrite-tennantite fahlores {∼CU 10 (Fe,Zn) 2 (Sb,As) 4 S 13 } and bournonite-seligmannite solid solutions {CuPb(Sb,As)S 3 } (400°C evacuated silica tubes, NH 4 Cl flux) indicate that the maximum nonidealities associated with the As-Sb substitution are…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation, characterization, and reactions of novel iron(III) porphyrin dication complexesHiroshi Tsurumaki, Yoshihito Watanabe, and Isao MorishimaCite this: J. Am. Chem. Soc. 1993, 115, 25, 11784–11788Publication Date (Print):December 1, 1993Publication History Published…
Fmoc-Argw, w′(Boc)2-OH and Boc-Argw, w′(Cbz)2-OH were prepared in two steps: Guanylation of Cu(II)-ornithine complex at Nδ with N, N′bis-urethane protected derivatives of 1-guanylpyrazole, followed by Nα-protection using either 9-fluorenylmethyl succinimidylcarbonate or di-t-butyl-dicarbonate in the presence of EDTA.…
Polypropylene fabrics were extracted with carbontetrachloride and acetone by Soxhlet extraction, and then PPAN ( plasma polymerized acrylonitrile ) was grafted to the surface of the extracted fabrics using a ground pressure of 0.05 mm Hg, 0.3 mm Hg pressure in the reactor, 60 W and 100 W RF power, and reaction times o…
Abstract In Upper Jurassic sandstones of the Magnus Sandstone Member from the Magnus Oilfield in the North Sea, diagenetic kaolinite morphology and isotopic composition vary away from the Late Cimmerian unconformity. Near the unconformity, coarse-grained (15-30 μm) vermiform kaolinite morphology is most common, wherea…
The kinetics of Zn2+ and Zn(OH)+ incorporation into and the kinetics of the acid catalyzed removal of Zn(II) from twelve water-soluble, sulfonated derivatives of tetraphenylporphyrin with alkyl or halogen groups in the para, ortho or di-ortho positions were investigated. While the incorporation reactions showed little…
The intercalation of hydrogen into the layered structure of MoO 3 produces four hydrogen molybdenum bronze phases H x MoO 3 (0<x<2). The correlation between the structure and the physical properties of these low-dimensional conductors has been investigated by X-ray diffraction and conductivity measurements. Powder dif…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHomonuclear copper(II) complexes with multidentate amino alcohol ligands. Synthesis and characterization of a hexanuclear copper compound with a propeller structure: CuII6(bdmap)3Cl6(O)(OH) (bdmap = 1,3-bis(dimethylamino)-2-propanolato)Suning Wang, Zhen Pang, Jian Chuan Zhen…
Abstract In this communication a novel synthetic route to α‐ tert ‐butyl‐ω‐[ p ‐vinylphenyl]xy1terminated poly(2‐methylpropene) (PIB) macromonomers ( P3 (VB); P5 ) is described: magnified image and magnified image Attempts to synthesize such macromonomers in both one‐ and two‐step syntheses are described. The one‐step…
Surface roughness of planar samples causes an additional attenuation of X-ray diffraction intensity measured in Bragg–Brentano geometry. The decrease of intensity becomes stronger with decreasing scattering angle. This is part of the microabsorption effect. Two quantitative expressions describing the microabsorption e…
A Michelson interferometer of the reflection type was successfully used, for the first time, to observe the surface microtopography and the interfacial concentration gradient layers around protein crystals, which were either growing or dissolving in the solution. The significance of this technique was mentioned for th…
Tensile creep tests of single Si‐C‐O fibers (Nicalon, Nippon Carbon Co., Tokyo, Japan) were conducted in argon at 1300°C and 300 to 700 MPa. Fibers exhibited only primary creep, where the creep strain ɛ and creep time t could be empirically fitted by ɛ= (1/β) ln (1 +βɛ 0 t ). The fiber deformation was described by a r…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTViscoelastic relaxation in semidilute and concentrated polymer solutionsWyn Brown and Petr StepanekCite this: Macromolecules 1993, 26, 25, 6884–6890Publication Date (Print):December 1, 1993Publication History Published online1 May 2002Published inissue 1 December 1993https:/…
Stoichiometric and near‐stoichiometric silicon carbide fibers, derived from the polymer polycarbosilane, have been characterized by scanning Auger and transmission electron microscope techniques. Excess carbon usually appeared in the fibers, but it could be eliminated by controlling processing conditions. The fibers c…