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The modified embedded atom method (MEAM), an empirical extension of the embedded atom method (EAM) that includes angular forces, has been used to examine the interface between a silicon substrate and a thin overlayer of nickel. A brief review of the MEAM is given and parameters are determined for the Si-Ni system. As…
Abstract. We discuss two new results on tilings of the plane. In the first, we give sufficient conditions for the tilings associated with an inflation rule to be uniquely ergodic under translations, the conditions holding for the pinwheel inflation rule. In the second result we prove there are matching rules for the p…
X‐ray absorption spectra at the Zr‐, Y‐, and Nb‐ K edges of ZrO 2 ‐YNBO 4 solid solutions have been measured at 10 K to determine the local atomic structures. Both Y and Nb cations substitute for Zr in the cation network but maintain rather different local oxygen coordination from Zr. In tetragonal zirconia solid solu…
Abstract The effect of copolymerization of L ‐lactide with several lactones and cyclic carbonates and the processing variables in compression moulding of poly( L ‐lactide) homopolymers on the mechanical properties was investigated. Sharp maxima in the impact strength versus comonomer composition and heat of fusion wer…
A 16-residue amphiphilic oligopeptide (EAK16) with every other residue alanine and also containing glutamic acid and lysine (Ac-NH-AEAEAKAKAEAEAKAK-CONH2) is able to form an unusually stable beta-sheet structure. The beta-sheet structure is stable at very low concentrations in water and at high temperatures. Various p…
Measurements of relative permittivity (\ensuremath{\varepsilon}=\ensuremath{\varepsilon}\ensuremath{'}-i\ensuremath{\varepsilon}\ensuremath{''}) in the complex perovskite crystal ${\mathrm{Na}}_{1/2}$${\mathrm{Bi}}_{1/2}$${\mathrm{TiO}}_{3}$ were carried out as functions of frequency (0.02--300 kHz) and temperature (3…
Although intergranular stress corrosion cracking (IGSCC) of high-pressure gas pipelines has been known for more than 20 years, a transgranular form (TGSCC) was detected more recently. Instances of TGSCC have been associated with dilute solutions with pH values in the region of 6.5 because of the presence of carbon dio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPatterns of Stoichiometric and Catalytic Reactions of Organozirconium and Related Complexes of Synthetic InterestEi-Ichi Negishi and Tamotsu TakahashiCite this: Acc. Chem. Res. 1994, 27, 5, 124–130Publication Date (Print):May 1, 1994Publication History Published online1 May…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPeroxo and Superoxo Complexes of Chromium, Molybdenum, and TungstenMichael H. Dickman and Michael T. PopeCite this: Chem. Rev. 1994, 94, 3, 569–584Publication Date (Print):May 1, 1994Publication History Published online1 May 2002Published inissue 1 May 1994https://pubs.acs.o…
Suspensions of identical particles with hard-sphere-like interactions are studied at concentrations for which the equilibrium state is crystalline. Dynamic light scattering measurements on these suspensions, in their metastable amorphous states prior to crystallization, identify the kinetic glass transition (GT) by th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and Characterization of InP Quantum DotsOlga I. Micic, Calvin J. Curtis, Kim M. Jones, Julian R. Sprague, and Arthur J. NozikCite this: J. Phys. Chem. 1994, 98, 19, 4966–4969Publication Date (Print):May 1, 1994Publication History Published online1 May 2002Published…
X‐ray absorption spectra at Zr‐ K , Ce‐L 111 and Ge‐ K edges in ZrO 2 –CeO 2 and ZrO 2 –GeO 2 solid solutions have been measured at 10 K. Both Ce and Ge substitute for Zr in the cation network, but CeO 8 and GeO 4 polyhedra are maintained around the dopants. The oversized CeO 8 is compressed to a Ce–O distance of 2.30…
Theor. models for the action spectrum and the current-voltage characteristics of microporous (colloidal) semiconductor films in photoelectrochem. cells were derived. The derivation is based on the assumptions that the charge carrier transport in the semiconductor occurs via diffusion, and that the diffusion length is…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDoped LaGaO3 Perovskite Type Oxide as a New Oxide Ionic ConductorTatsumi Ishihara, Hideaki Matsuda, and Yusaku TakitaCite this: J. Am. Chem. Soc. 1994, 116, 9, 3801–3803Publication Date (Print):May 1, 1994Publication History Published online1 May 2002Published inissue 1 May…
Abstract A new tetraphenylated heterocylic diol, 2,5‐bis(4‐hydroxyphenyl)‐3,4‐diphenylpyrrole, was synthesized in three steps starting from 4‐methoxydeoxybenzoin. The tetraphenylpyrrole‐containing polyarylates having inherent viscosities of 0.28–0.88 dL/g were prepared from the diol and various aromatic dicarboxylic a…
Abstract Packing density and gas permeability of a three‐component copolymide series is presented. The three‐component polyimides are prepared a via “stepwise” synthesis procedure that goes through the acid anhydride terminated pre‐polymer. The procedure ensures the statistical distribution of segments of the polymers…
Abstract Formation of SiO 2 –B 2 O 3 gel fibers and oxides was investigated by the sol‐gel method using tetraacetoxysilane (TAS) and boron tri‐ n ‐butoxide (BTB). Low molecular weight borosiloxanes (BS) were formed by the reaction of TAS with BTB in THF. Partial alkoxylation and hydrolysis of BS followed by further co…
Abstract The curing of epoxidized natural rubber with p ‐phenylenediamine catalyzed by bisphenol A was investigated. The curing reaction was found to be first order with respect to the amine and to have an activation energy of 67.5 kJ/mol. Vulcanizates of tensile strength 12.5–16.0 MPa were obtained at cure times of 3…
Abstract Glycine/glycolic acid based biodegradable copolymers have been prepared by ring‐opening homopolymerization of morpholine‐2,5‐dione, and ring‐opening copolymerization of morpholine‐2,5‐dione and glycolide. The homopolymerization of morpholine‐2,5‐dione was carried out in the melt at 200°C for 3 min using stann…
Abstract The crystallization kinetics of polypropylene (PP), polyamide (PA66), and poly(ethylene terephthalate) (PET) were studied, using a pressure dilatometer (to 200 MPa) to follow the volume changes associated with the crystallization process. The commonly used Avrami equation fitted the isothermal/isobaric crysta…