Materials Literature
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Crystal structures are known for aspartate carbamoyltransferase (ATCase) in the T and R states, with and without the allosteric activator adenosine triphosphate (ATP) or inhibitor cytidine triphosphate (CTP). Visual inspection of X-ray crystal structures does not provide all of the information necessary for the determ…
In this paper we review experimental and theoretical findings related to the recently discovered mechanism of moisture-induced environmental embrittlement in FeAl-based alloys. We show that when low aluminum content FeAl alloys (35 and 36.5% Al) are tested in air, the aluminum in the alloys reacts with moisture in the…
The mixed crystal ${\mathrm{Rb}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$(${\mathrm{NH}}_{4}$${)}_{\mathit{x}}$${\mathrm{H}}_{2}$${\mathrm{AsO}}_{4}$ (RADA) has been investigated for several values of (x=0,0.12,0.15, and 0.20) by measuring the complex dielectric permittivity along the a tetragonal axis in the temperature…
Sulfate-reducing bacteria can cause or influence corrosion in both carbon (or low-alloy) steels and stainless steels. The electrochemical reactions and rate-controlling processes are quite different in these two cases, the common feature being the catalysis of anodic dissolution by adsorption of hydrogen sulfide. In t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFactors determining the site of electroreduction in nickel metalloporphyrins. Spectral characterization of nickel(I) porphyrins, nickel(II) porphyrin .pi.-anion radicals, and nickel(II) porphyrin .pi.-anion radicals with some nickel(I) characterK. M. Kadish, M. M. Franzen, B…
The combined use of small-angle X-ray scattering (SAXS) and photon correlation spectroscopy (PCS) to characterise adsorbed layers of β-casein at the solid/liquid interface is reported. The protein was adsorbed to polystyrene latex particles at room temperature, low ionic strength and neutral pH and adsorption densitie…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGeneration and oligomerization of bicyclo[2.2.2]octyne and properties of tris(bicyclo[2.2.2]octeno)benzene obtained from the linear trimerKoichi Komatsu, Shuji Aonuma, Yasuhisa Jinbu, Ryotaro Tsuji, Chitaru Hirosawa, and Kenichi TakeuchiCite this: J. Org. Chem. 1991, 56, 1,…
We report the synthesis and structure of a novel hexanuclear copper complex of the anion of 6-methyl-2-hydroxypyridine (MeL), which undergoes reaction with lanthanum nitrate to give [La8Cu12(OH)24(NO3)22(MeLH)13(H2O)6][NO3]2[MeLH]2·CH2Cl2, a copper–lanthanoid complex with several unique structural features.
The synthesis of a new copper(II) phthalocyaninate substituted with four 15-membered tetraazamacrocycles from 15,16-dibromo-2,5,9,12-tetra(toluene-p-sulphonyl)-2,3,4,5,6,7,8,9,10,11,12,13-dodecahydro-1H-2,5,9,12-benzotetraazacyclopentadecine is described. Quaternization of the aza groups leads to water-soluble product…
The thermal‐stress fracture behavior of duplex ceramics is investigated by quenching in water and in oil. Comparison with the matrix materials shows that the critical quenching temperature difference, Δ T c , is not or is only slightly reduced, even for duplex ceramics of significantly reduced strength. In sintered co…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal reactivity of hydrogenosilsesquioxane gelsV. Belot, R. Corriu, D. Leclercq, P. H. Mutin, and A. ViouxCite this: Chem. Mater. 1991, 3, 1, 127–131Publication Date (Print):January 1, 1991Publication History Published online1 May 2002Published inissue 1 January 1991https…
The title complexes form stable mesomorphic phases, and provide a new series of thermotropic liquid-crystalline complexes containing tertiary phosphines co-ordinated to a transition metal.
Abstract This report describes the synthesis and redox behaviour of polyaniline in aqueous solutions of benzene sulphonic acid and 4‐toluene sulphonic acid. The characterization of the polymer was carried out by electronic spectra, FTIR studies and 1 HNMR in DMSO‐d 6 .
The synthesis and characterisation of a subphthalocyanine and its planar binuclear dimer: the first example of an aromatic macrocyclic dimer containing boron is reported.
The 5-dimethylaminoindolylfulgide–trichloroacetic acid (1 : 1.4) system in toluene was found to constitute a photochromic system having a non-destructive readout ability applicable to rewritable photon mode optical memories.
X-Ray photoelectron spectroscopy (XPS) data of Pd clusters in NaY, MgY and HY zeolites show that the chemical shift of the Pd 3d5/2 line is dependent on the concentration of the protons and their position in the zeolite. The positive charge or ‘electron deficiency’ of the Pd particles is significant even for Pd/NaY wh…
The fracture toughness behavior during crack growth ( K R ‐curve behavior) of duplex ceramics is investigated. Different types of K R ‐curves can be distinguished depending on the microstructural designs of these materials which are characterized by the volume fraction and size of the dispersed pressure zones, and by…
Electrically conducting π-conjugated copolymers consisting of π-excessive thiophene-2,5-diyl and π-deficient pyridine-2,5-diyl monomer units show a unique cyclic voltammogram with an unusually large potential difference between the doping and the undoping peaks, and their electronic and fluorescence spectra support oc…
Systematic investigations have allowed us to formulate a structural model representing the relationship between vitrification and mesogenity in low-molecular-weight liquid-crystalline compounds. The tendency to transform the highly viscous mesophases into glass phases is caused mainly by the bulkiness of the molecules…
A series of palladium clusters containing from four to several hundred Pd atoms in the metal skeleton has been prepared and characterized with respect to structure and chemical properties, including catalytic activity. For smaller clusters good agreement was observed. between single-crystal X-ray and EXAFS structural…