Materials Literature
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Research News: Protein cages acting as constrained reaction environments have recently been used to synthesize inorganic materials of nanometer dimensions. The size of the cavity within the protein and the level of loading with metal ions determine the final dimensions of the materials, and therefore site‐specific mod…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of new polysiloxane starburst polymersAtsushi Morikawa, Masaaki Kakimoto, and Yoshio ImaiCite this: Macromolecules 1991, 24, 12, 3469–3474Publication Date (Print):June 1, 1991Publication History Published online1 May 2002Published inissue 1 Jun…
The amino-terminal pro-sequence consisting of 77 amino acid residues is required to guide the folding of secreted subtilisin E, a serine protease, into active, mature enzyme (ikemura et al., 1987). Furthermore, denatured subtilisin E can be folded to active enzyme in an intermolecular process with the aid of an exogen…
Fatigue crack propagation in 3Y‐TZP was investigated using controlled surface flaws. A unique growth law strongly dependent on the maximum stress intensity factor and quadratically dependent on the amplitude of the range of stress intensity factor was established. This growth law was found to apply for both surface fl…
A new molecular photovoltaic system for solar light harvesting and conversion to electricity has been developed. It is based on the spectral sensitization of a thin ceramic membrane by suitable transition metal complexes. The film consists of nanometer-sized colloidal titanium dioxide particles sintered together to al…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structure and magnetic properties of bis(isothiocyanato)bis(pyrazine)iron polymer, a 2D sheetlike polymerJose Antonio Real, Giovanni De Munno, M. Carmen Munoz, and Miguel JulveCite this: Inorg. Chem. 1991, 30, 12, 2701–2704Publication Date (Print):June 1, 1991Publica…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharge-transfer photochemistry in ion-molecule cluster complexes of silverK. F. Willey, P. Y. Cheng, M. B. Bishop, and M. A. DuncanCite this: J. Am. Chem. Soc. 1991, 113, 13, 4721–4728Publication Date (Print):June 1, 1991Publication History Published online1 May 2002Publishe…
The local chain dynamics of bulk amorphous polymers above the glass transition temperature is studied by means of molecular dynamics simulations in the time scale up to 10−9 s. A model of polyethylene having a realistic density is used where a fully vibrational treatment is applied to the chains subject to nonbonded i…
Directional solidification experiments have been carried out using the analogue casting system of NH 4 Cl-H 2 O solution by cooling it from below with a constant-temperature surface ranging from - 31.5°C to + 11.9 °C. The NH 4 Cl concentration was 26% in all solutions, with a liquidus temperature of 15 °C. It was foun…
Few superconducting materials have presented us with the structural elegance and complexity displayed by the recently discovered high-Tc copper oxides. The structures of these materials, consisting of metal-oxygen layers stacked in a variety of sequences, with the metal atoms often in unusual coordinations, are intere…
Tension—tension cyclic loading tests have been conducted on a coarse‐grained alumina ceramic that exhibits toughnesscurve behavior by grain‐interlock bridging. Fatigue effects are observed in the regions of both short cracks, using indentation flaws, and long cracks, using compact‐tension specimens. A true mechanical…
Samples based on the intermetallic compound Al3Ti have been made by mechanical alloying the elemental components and sintering. Intense deformation of the compound was achieved by extrusion at 600°C and the mechanisms of deformation are examined. A major mode of deformation under such conditions is ordered twinning of…
Les parametres cristallins a et c augmentent avec la concentration en Cs depuis a=10,1688 et c=2,9595 A dans Cs 0,40 Ba 0,79 Ti 8 O 16 a 5 K jusqu'a a=10,2682 et c=2,9643 A dans Cs 1,36 Ti 8 O 16 a 5 K. La dilatation est isotope seulement dans Cs 1,36 Ti 8 O 16 avec 8.10 −6 K −1 a 300 K. Etude de l'influence de la pre…
Amorphous N2O4 solid was formed on predeposited oxygen or krypton layers. Evaporation of the underlying layer and redeposition of the inert impurities resulted in decomposition of the ionic nitrosonium nitrate clusters within the solid nitrogen tetroxide. Infrared features indicate NO+NO−3 decomposition to occur via m…
A system was assembled which can perform high-sensitivity partial discharge (PD) measurements under combined electric stress and X-ray irradiation on 138-kV class gas-insulated switchgear (GIS) post insulators. Under X-ray irradiation, the PD pulse repetition rate is increased and the discharge inception voltage (DIV)…
An investigation has been made of the solid state constitution of the titanium rich portion of the Ti–Al–C system; partial isothermal sections have been established at 1250, 1050, and 750°C by means of electron microscopy (including energy dispersive X-ray analysis) and X-ray diffraction. In addition, a schematic liqu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structure of native celluloseYasuhiro Takahashi and Hideki MatsunagaCite this: Macromolecules 1991, 24, 13, 3968–3969Publication Date (Print):June 1, 1991Publication History Published online1 May 2002Published inissue 1 June 1991https://pubs.acs.org/doi/10.1021/ma000…
The coated particle fuel has been developed within a framework of the HTTR (High Temperature engineering Test Reactor) Development Program at the Japan Atomic Energy Research Institute. The HTTR fuel is a prismatic block type containing TRISO-coated U02 particles. Research and development on the fuel has been progress…
X‐ray photoelectron spectroscopy (XPS) spectra were measured for the high‐temperature forms (quenched from 1500°C) of zirconium titanate and its solid solutions, the low‐temperature forms (quenched from 1000°C), and cubic Ba(Zr 1/2 Ti 1/2 )O 3 . Two distinct differences in the XPS spectra were noted between the high‐…
An aperture-limited, differentially pumped environmental cell has been developed and installed in a JEOL 4000 EX electron microscope. With this environmental cell it is possible to observe, at high spatial resolution, the detailed changes in microstructure that occur during the interaction between a solid and a gaseou…