Materials Literature
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Abstract With a view to discovering new electron donors for low-dimensionally metallic materials, the title compounds were prepared via the corresponding 1,8-dichalcogen-bridged naphthalenes. Their donor characters were examined by cyclic voltammetry, as compared with those of the reference compounds.
The research investigations aiming at taking advantage of the chemical and structural consequences of ligand macrocyclization are reviewed with regard to the three features as follows: (1) Tetraazacycloalkane complexes which take up carbon dioxide as ROCO2 − or R2NCO2 −; (2) Correlation between axial and inplane coord…
Abstract Chemical reactions in the epoxy‐functional silane hydrolyzate bulk have been studied by Fourier transform infrared spectroscopy (FT‐IR). It was found that the silanol group opened the epoxy ring upon heating, concurrently with the silanol condensation. The kinetics of these reactions were studied, and the rel…
Abstract Poly(ϵ‐caprolactam) (PCL) with improved flame‐retardant (FR) properties can be easily obtained by activated anionic polymerization of the monomer, ϵ‐caprolactam (C), in the presence of adequate amounts of red phosphorus (red P). Analogous results with reduced P content can be achieved by coupling red P with a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChain flexibility parameter and persistence length of various poly(methacrylic acid esters)Michel TricotCite this: Macromolecules 1986, 19, 4, 1268–1270Publication Date (Print):April 1, 1986Publication History Published online1 May 2002Published inissue 1 April 1986https://p…
A linear correlation between the degree of overloading on the crack tip and brittleness was observed. The intercept, which was √2, is identified with a minimum condition of overloading where branching occurs at twice the fracture energy. The slope was identified with the degree of plastic deformation at the crack tip…
Abstract Photoelectrochemical polymerization of pyrrole occurs at irradiated areas of semiconducting electrodes in aqueous solution of pyrrole. Organic conducting polypyrrole patterns were formed on semiconductors by area-selective irradiation of the semiconductor electrodes. The deposition rate was 0.5–0.7 μm per 100…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrophobic, regiospecific guest binding by transition-metal host complexes having permanent voids as revealed by FT-NMR relaxation studiesThomas J. Meade, Whei Lu. Kwik, Norman. Herron, Nathaniel W. Alcock, and Daryle H. BuschCite this: J. Am. Chem. Soc. 1986, 108, 8, 1954–…
High-resolution heat capacity measurements have been carried out in the smectic-A--hexatic-B--crystal-B transitions of the compound 4-propionyl-4'-(n-heptanoyloxy)azobenzene. Qualitatively, the heat-capacity anomalies of this smectic-A--hexatic-B--crystal-B transition sequence mimic those of the smectic-C--smectic-I--…
The equations of Dill for bleaching of photoactive compound in positive photoresists have been solved analytically in closed form. As an application, the contrast γ, has been evaluated explicitly in the absence of reflection from the substrate.
Two new techniques for determining the emissivity, reflectivity and transmissivity of fabrics in the infra-red region of the spectrum are described and experimental results reported. Results obtained by both techniques compared favourably. The thermal radiative properties of many textile fabrics were found to be somew…
A model is developed for the thermally activated motion of 1/2〈110〉 superpartial dislocations on {010} planes and 1/3〈112〉 superpartials on {111} planes, when antiphase boundaries on {111} planes are unstable. These two superpartials are sessile because they have non-planar cores. The model is based on Duesbery′s mode…
We analyze the thermodynamic properties of the metal-insulator transitions at nonzero temperature in the paramagnetic phase, within a model proposed recently. The correlated motion of electrons is expressed through a band narrowing \ensuremath{\Phi} which reflects a restricted hopping of electrons due to on-site Coulo…
Abstract The Nriagu polymer model of 2:1 layer type clay minerals develops from the premise that clay minerals are condensation copolymers of solid hydroxides. In the Mattigod-Sposito formulation of the model, standard state chemical potentials (standard Gibbs energies of formation from the elements) of 2:1 clay miner…
Liquid–solid and solid–state phase equilibria have been studied in the Ni–NiAl–Ni3Ta triangle of the Ni–AI–Ta system, using a combination of several experimental techniques. Five primary phases occur in this region, including the ternary compound, π, Ni6TaAI, which enters into equilibrium with each of the other four.…
The main problem to be solved before advanced engineering ceramics can become industrial reality is that components having reliable and consistent properties cannot be made, and rejection rates can be as high as 95%, in stark contrast to the situation with metals and polymers. This results from the small size of defec…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBonding mode of axial thiocyanate ligands of iron macrocyclic complexes. Crystal structure of [Fe(TIM)(SCN)2]PF6M. J. Maroney, E. O. Fey, D. A. Baldwin, R. E. Stenkamp, L. H. Jensen, and N. J. RoseCite this: Inorg. Chem. 1986, 25, 9, 1409–1414Publication Date (Print):April 1…
High-density ThO2-2% UO2 (233U) pellets are a strong candidate fuel for advanced pressurized heavy water reactors. A process flow sheet based on sol-gel microsphere pelletization has been developed for the first time for fabrication of high-density mixed-oxide pellets at relatively low compaction pressures (350 MPa) a…
Abstract New nickel(II) and palladium(II) complexes having both hydrido and arylthiolato ligands, MH(SAr)(PCy3)2, and complexes with aryl and mercapto ligands, Ni(Ar)(SH)(PEt3)2 (M = Ni, Pd; Ar = C6H5-,p-CH3-C6H4-, p-CH3OC6H4-), were prepared. Thermolysis of these complexes caused cleavage of the S–C or S–H bond to ev…
Abstract The effects of selected cationic and anionic impurities on the precipitation of gypsum in aqueous brine have been studied in a continuous MSMPR crystalliser. Crystal size distributions, determined by in situ Malvern laser light‐scattering measurements, were found to be bimodal. The suspected presence of agglo…