Materials Literature
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Abstract Optically pure methyl, ethyl, isopropyl, and benzyl (R)‐malolactonate were prepared from (S)‐(‐)‐malic acid and were polymerized in the bulk with tetraethylammonium benzoate as the initiator to yield high‐molecular‐weight, crystalline polymers. The optical purity of methyl and benzyl malolactonate was determi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic exchange interactions in nitroxyl biradicals bridged by metal-metal bonded complexes: structural, magnetochemical, and electronic spectral characterization of tetrakis(perfluorocarboxylato)dimetal(II) complexes of rhodium and molybdenum containing axially coordinate…
High-resolution measurements of the cubic refractive index (RI) of ${\mathrm{PbTiO}}_{3}$ reveal contributions due to the fluctuating polarization, which attains about 14% of the spontaneous polarization at ${T}_{c}$=769 K. In the tetragonal phase the anomalies of both RI's are shown to be negative with nearly equal a…
Abstract The crystal structure of a freibergite (Ag-tetrahedrite) from Keno Hill, Yukon, Canada, and a tetrahedrite from Turquetil Lake, NWT, Canada, have been refined. The freibergite, Cu 5.84 Ag 4.22 Fe 1.59 Zn 0.43 Sb 4.10 AS 0.13 S 13 , a = 10.610(2) Å, and the tetrahedrite, Cu 10.24 Fe 1.03 Zn 0.97 Ag 0.05 Sb 3.6…
Article The Processing of Thermoplastics Containing High Loadings of Long and Continuous Reinforcing Fibers was published on December 1, 1986 in the journal Journal of Polymer Engineering (volume 6, issue 1-4).
Abstract (R)‐(+) and (S)‐(‐)‐benzyl malolactonates were copolymerized anionically by using triethylamine and aluminum porphyrin as initiators. Configurational composition of resulting optically active poly(benzyl β‐malate) stereocopolymers depends on the enantiomeric purity in the monomer feed. Stereochemistry during…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and x-ray structure of the [HNi38(CO)42C6]5- cluster: an extended fragment of the Cr23C6 lattice stabilized in a molecular carbonyl nickel clusterAlessandro. Ceriotti, Anna. Fait, Giuliano. Longoni, Giampietro. Piro, Francesco. Demartin, Mario. Manassero, Norberto.…
Abstract The deuteron diffusion in acceptor‐doped barium titanate ceramics is studied as a function of the dopant concentration (0 to 1.0 mol% Ni) using a thermal desorption technique. The 0.1 mol% Ni‐doped sample shows a diffusion coefficient D = 290 cm 2 s −1 · exp(‐151 kj mol −1 / RT ). The dopant concentration has…
Abstract The surface free energy of Ca-montmorillonite has been determined from measurement of the contact angle of water on an oriented deposit immersed in n -alkanes; the oriented deposits were equilibrated at different relative humidities. These experiments provided the polar, γ S P , and dispersive, γ S D , compon…
ADVERTISEMENT RETURN TO ISSUEArticleNEXTMemory of spin polarization in triplet-doublet systemsTakashi Imamura, Osamu Onitsuka, and Kinichi ObiCite this: J. Phys. Chem. 1986, 90, 26, 6741–6744Publication Date (Print):December 1, 1986Publication History Published online1 May 2002Published inissue 1 December 1986https://…
The liquid crystalline compounds having an optically active 1-methyl-alkoxy-phenyl group were synthesized. They show some abnormality, i.e., firstly rather high value of spontaneous polarization for the structural feature lacking a strongly polar group, in the vicinity of the chiral center, and secondly the sense of t…
Abstract A study to investigate the role of nitrogen in improving the pitting corrosion resistance of types 316 and 304 stainless steel weld metals has been attempted. Weld metals were prepared by autogenous TIG welding process with argon‐nitrogen mixture as the shielding gas. Delta‐ferrite measurements, made with Mag…
Heme d1 is the noncovalently associated heme prosthetic group of the bacterial nitrite reductase known as cytochrome cd1. Additional evidence has been obtained in support of a dioxoisobacteriochlorin, or 1,3-porphyrindione, skeleton for this heme. The new data include the natural abundance 13C NMR spectrum of the free…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHeterolytic and homolytic oxygen-oxygen bond cleavage reactions of acylperoxomanganese(III) porphyrinsJohn T. Groves and Yoshihito WatanabeCite this: Inorg. Chem. 1986, 25, 27, 4808–4810Publication Date (Print):December 1, 1986Publication History Published online1 May 2002Pu…
Abstract The acidic aqueous solution of imogolite is proposed to be an ideal lyotropic system. No temperature dependence was marked on the two phase boundary concentrations (A and B points) of imogolite solutions as predicted by the theories of Flory and Onsager. A satisfactory quantitative agreement was observed with…
An elasticity solution is utilized to analyze an orthotropic fiber in an isotropic matrix under uniform thermal load. The analysis reveals that stress distributions in the fiber are singular in the radial coordinate when the radial fiber stiffness (Crr) is greater than the hoop stiffness (Cθθ). Conversely, if Crr <…
The effect of the nature of the oil phase of w/o/w emulsions stabilized by interfacial complexation between span 80 (sorbitan mono-oleate) and albumin has been studied. The long-term stability of the systems has been assessed by photomicrography and by measuring the quantity of an internal marker (NaCl) remaining entr…
High-resolution heat-capacity, tilt-angle, and polarization measurements have been carried out in the vicinity of the smectic-A (SmA) --chiral-smectic-C (Sm${C}^{\mathrm{*}}$) phase transition of p-(n-decyloxybenzylidene)-p-amino-(2-methylbutyl)cinnamate (DOBAMBC). Heat-capacity studies were done on two different samp…
A mechanical model for the lateral compression of woven fabrics is derived from Van Wyk's compression law for fiber assemblies. The pressure ( P) and thickness (v) relationship is P = a/( v - v')3. The parameter v' refers to the core of the fabric, which is incompressible over the pressure range 2-5000 gf/cm 2 . The p…
The energy and atomic structure of {1121}, {1122) and {1012} twin boundaries in the hexagonal-close-packed (h.c.p.) metals have been investigated using computer simulation. Three distinctly different interatomic potential functions have been used in either equilibrium or non-equilibrium form. It is predicted that only…