Materials Literature
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Abstract The fundamental skeleton of the tropones possessing a unique heptagonal structure is predicted to be aromatic with positive resonance energies and conforming to the topological charge stabilization rule (TCS rule). Similarly, naturally occurring tropolones also nicely fit the theory that conformity to the TCS…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacterization of ammonia-ligated low-spin iron(III) porphyrin complexesYunghee Oh Kim and Harold M. GoffCite this: Inorg. Chem. 1990, 29, 19, 3907–3908Publication Date (Print):September 1, 1990Publication History Published online1 May 2002Published inissue 1 September 199…
The dielectric polarization has been used to study dipolar association of 4-n-pentyl-4′-cyanobiphenyl in benzene solution. The results have been interpreted with the assumption of a monomer–dimer equilibrium. To explain the relatively high effective dipole moment of the dimers, a new structure has been proposed for th…
Abstract The time for brittle failure by slow crack growth for 22 polyethylene copolymers was measured in Igepal and air. The notched tensile tests were conducted in Igepal and air at 50°C and 4.2 MPa and in air at 80°C and 2.4 MPa. For failure times less than 10 3 min, the difference between the Igepal and air enviro…
Single-crystal MgO and SrTiO 3 substrates have been raised to temperatures suitable for deposition and in situ annealing of high-T c superconducting thin films by the absorption of 10.6 mu m laser radiation. Steady-state temperature control in vacuum and low-pressure oxygen was achieved by varying the mark-space ratio…
Abstract : Sections of CDA 706 piping and Monel 400 tubing were severely pitted after exposure to marine and estuarine waters, respectively. Surfaces of both alloys were uniformly covered with thick surface deposits, ranging in color form blue-green to reddish brown to black. Pits developed under surface deposits cont…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochromic molybdenum trioxide thin film preparation and characterizationDaniel Belanger and Guylaine LaperriereCite this: Chem. Mater. 1990, 2, 5, 484–486Publication Date (Print):September 1, 1990Publication History Published online1 May 2002Published inissue 1 Septembe…
The photoluminescence decay of the CaS:Mn 2+ phosphor activated with a fairly large amount of Mn 2+ (1-2mol%) consists of slow (8.5 ms at 80 K) and fast (550 µs at 80 K) exponential decay components due to the single and paired Mn 2+ centers, respectively. From the measurements of time-resolved emission spectra, the e…
Abstract The hemithioindigo derivatives have been found to show satisfactory photoresponses even after more than 104 cycles of alternate irradiation with the lights which can induce a Z–E isomerization.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, electrochemistry, and kinetic investigations of low-spin ferrous bis(difluoroboryl)bis(dioximate) complexesDavid W. Thompson and Dennis V. StynesCite this: Inorg. Chem. 1990, 29, 19, 3815–3822Publication Date (Print):September 1, 1990Publication History Published…
Abstract Bis(trimethylsilyl)bisphenol‐A was condensed with 4,4′‐dichlorodiphenyl sulfone under various reaction conditions. Satisfactory yields and molecular weights of the resulting poly(ethersulfone)s were only obtained when the condensation was conducted in amide solvents (e. g., N ‐methyl‐2‐pyrrolidone) in the pre…
The fusion reactor represents the most difficult challenge of any energy system from the viewpoint of developing materials which will allow fusion to be realized as an economic, safe and environmentally acceptable energy source. Substantial progress has been made over the past decade towards an understanding of the ef…
The electro-optic performance characteristics of PDLC films using two different polymers, namely, poly (methyl methacrylate) (PMMA) and poly (vinyl chloride:vinyl acetate 17%) (PVC:VAC-17) and liquid crystal mixture E-8 (BDH, England) have been studied. It is found that the PMMA-based PDLC films have more superior mec…
Sixteen azobenzene derivatives were used as guests in an ester-type host liquid crystal (LC), 4-hexy- loxyphenyl-4′-ethyl-cyclohexanecarboxylate (ECH 206), and were examined on their ability to induce the photochemical isothermal phase transition of the guest/host mixtures. Attention was focused on the effect of the m…
Abstract The impact behavior of nylon 6‐ rubber blends is studied by varying the rubber concentration (0–26 vol. %), rubber particle size (0.1 ‐ 2.0 μm) and rubber properties. The brittle to tough transition shifts to lower temperatures by increasing the rubber concentration, decreasing the particle size and by loweri…
Abstract Depth profiles calculated using simple peak‐to‐peak or peak height or area measurements are subject to inaccuracies caused by spectral noise, sloping backgrounds and possibly by overlapping spectra of different elements or chemical species. An automated program that reduces or eliminates the effects of these…
Dechlorination of chloroform in water with ultrasound in combination with hydrogen peroxide has been studied. It is believed that the decomposition of chloroform is accomplished by free radical reaction. The experimental results indicate that the optimal hydrogen peroxide concentration has a molar ratio of H2O2:CHCl3…
A thermoviscoplastic computational method for hypersonic structures is presented. The method employs unified viscoplastic constitutive model implemented in a finite element approach for quasi-static thermal-structural analysis. Applications of the approach to convectively cooled hypersonic structures illustrate the ef…
The effect of polymer additive on the growth and collapse of a spherical vapour bubble is investigated theoretically, under conditions appropriate for cavitation (negligible influence of heat transfer, Newtonian viscosity, etc.). The polymer-induced stress is calculated using the yo-yo model of the polymer dynamics in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGas-phase structures of dimethylboron azide and dimethylboron isocyanate. Electron diffraction and ab initio studyRenee Hausser-Wallis, Heinz Oberhammer, Wolfgang Einholz, and Peter O. PaetzoldCite this: Inorg. Chem. 1990, 29, 18, 3286–3289Publication Date (Print):September…