Materials Literature
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Abstract Dimethylsulphoxide (DMSO)‐hydrogen chloride interactions have been studied by means of Raman and infrared spectroscopy both in solid 1:1 adducts and in liquid mixtures with DMSO:HCl molar ratios >2. The deuterated analogue solid 1:1 (DMSO‐ d 6 )‐DCl was also prepared and studied. Vibrational data suggest t…
Air permeabilities for two woven fabric constructions having common warps but different filling yarns were measured. The filling yarns were produced by ring spinning, open-end spinning, core-wrapping with filament, and a no-twist process. Comparison of air permeabilities of the woven fabrics were made in the gray and…
Abstract Cs3(AuBr 4 ) 2 Br 3 is obtained in the form of red needles by adding the stoichiometric amount of CsBr to a solution of HAuBr 4 and Br 3 - in aqueous HBr. The salt decomposes slowly at room temperature to form a mixed-valent, cubic bromo aurate(I,III), in which the linear AuBr 2 - ions are partially substitut…
Abstract The technical properties and the network structure of carboxylated nitrile rubber (XNBR) having a mixed crosslink system of sulfur and metal carboxylate have been studied. XNBR of different carboxyl contents (Krynac 221, Krynac 110C), yielding different concentrations of ionic crosslinks, have been used for t…
Abstract Two chlorites, sheridanite and clinochlore, have been examined to determine their surface charge characteristics. In order to increase their surface area and to produce a measurable surface charge, the chlorites were treated with 10 −3 m , 10 −2 m , and 10 −1 m HCl in 10 −2 m MgCl 2 solutions. These treatment…
Abstract The interaction of silica and oligomeric methylsiloxanes, methylsilicone oil as well as silicone gum at elevated temperature was studied. It was found that a reaction takes place between surface silanols and octamethylcyclotrasiloxane (D 4 ) above 180°C. Part of the methylsiloxane replaces the surface silanol…
A bstract The magnetic anomaly due to a uniformly magnetized vertical rectangular prism and that due to an arbitrary structure which can be divided into a number of such prisms are expressed in forms suitable for rapid computation. Both two‐dimensional and three‐dimensional cases are considered. The simplified express…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLasidiol angelate: an ant repellent sesquiterpenoid from Lasiantheae fruticosaDavid F. Wiemer and Diane C. AlesCite this: J. Org. Chem. 1981, 46, 26, 5449–5450Publication Date (Print):December 1, 1981Publication History Published online1 May 2002Published inissue 1 December…
Recently, geometrical, dynamical and topological arguments have been used to analyse the possible classes of defects in glasses. The results predict that there are no dislocations, that lines of disclinations may exist but should thread through the lattice via rings with an odd number of bonds, and that the disclinati…
Abstract Well-crystallized kaolinite was found to exhibit marked proton conductivity at pre-dehydration temperatures. Direct current conductivity and thermopotential measurements were performed. By comparing the results obtained with Au electrodes (proton blocking) to those obtained with Pd electrodes (proton injectin…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA new bridging ligand in dinuclear iron carbonyl species. Synthesis, properties, and x-ray structure determination of xanthate-hexacarbonyldiiron complexesHenri Patin, Gerard Mignani, Alain Benoit, Jean Yves Le Marouille, and Daniel GrandjeanCite this: Inorg. Chem. 1981, 20,…
Abstract The thermal decomposition of cis ‐1,4‐, trans ‐1,4‐, and 1,2‐polybutadienes (PBD) in the temperature range 450–900°C was investigated by pyrolysis gas chromatography (PGC). The cis ‐ and trans ‐PBDs have closely similar product distribution and can be readily distinguished at lower temperatures of pyrolysis f…
Single crystal, n-type CdTe (E sub g = 1.4 eV) has been studied with respect to barrier height, E sub B, when contacting a liquid electrolyte solution containing a fast, one-electron, outer-sphere redox reagent. We approximate E sub B as equal to the photovoltage measured by cyclic voltammetry of various redox couples…
L-Histidine, 90% 13C enriched at the C2 position, was incorporated into the catalytic triad of alpha-lytic protease (EC 3.4.21.12) with the aid of histidine-requiring mutant of Lysobacter enzymogenes (ATC 29487), and the pH dependence of the coupling constant between this carbon atom and its directly bonded proton was…
Abstract Four new ternary compounds KB 2 X 2 (B = Fe, Co, Rh; X = P, As) were prepared. They are isotypic and crystallize in a ThCr 2 Si 2 -type structure (I4/mmm) with the following lattice constants: KFe 2 As 2 : a = 384.2 pm c = 1386.1 pm KCO 2 AS 2 : a = 379.4 pm c = 1357.0 pm KRh 2 As 2 : a = 398.7 pm c = 1326.7…
Abstract The effects of Na-citrate-dithionite (NaCD), ammonium oxalate in the dark (NH 4 Ox-D), and photolytic reaction under ultraviolet radiation (NH 4 Ox-P) on the mineralogy of <2- µ m fractions of selected soils from Virginia were investigated. The NH 4 Ox-D treatment removed the smallest amounts of Al (<0.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAbsolute absorption cross sections for SO between 190 and 235 nmLeon F. PhillipsCite this: J. Phys. Chem. 1981, 85, 26, 3994–4000Publication Date (Print):December 1, 1981Publication History Published online1 May 2002Published inissue 1 December 1981https://pubs.acs.org/doi/1…
Abstract Concentration quenching of the luminescence in Y 1− x RE x Al 3 B 4 O 12 (RE = Sm, Gd, Dy;0 < x ≦ 1) is examined. In the case of gadolinium compound the quenching is due to energy migration among the Gd 3+ ions to quenching centres. From the decay curve of GdAl 3 B 4 O 12 a lower limit for the diffusion co…
Abstract The thermal decomposition of a number of TDI‐ and MDI‐based biscarbamates (model compounds for polyurethane foams) between 200°C and 1000°C showed that the urethane linkage undergoes an O ‐acyl fission at about 300°C to generate the free isocyanate and alcohol. In the case of the flexible foam analogues, the…
Abstract Generalized line graphs extend the ideas of both line graphs and cocktail party graphs. They were originally motivated by spectral considerations. in this paper several (nonspectral) classical theorems about line graphs are extended to generalized line graphs, including the derivation and construction of the…