Materials Literature
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Many discussions on packaging lead to undue expectations regarding the usability of degradable materials. There is also considerable misuse of the term “biodegradable.” The manufacture of a new foamed material based on native starch is discussed. The structure forms by water evaporation and gelatinization of starch du…
Tunable near-infrared optical parametric oscillation in an organic crystal has been achieved for the first time to our knowledge. A 1.9-mm-thick nonlinear molecular crystal of N-(4-nitrophenyl)-l-prolinol was pumped at a wavelength of 0.5927 μm and a pulse duration of 1 ns (FWHM). Tunability from 0.9 to 1.7 μm and a m…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochromic reactions involving palladium(II) octabutoxynaphthalocyanine and molecular oxygenBoris D. Rihter, Malcolm E. Kenney, William E. Ford, and Michael A. J. RodgersCite this: J. Am. Chem. Soc. 1993, 115, 18, 8146–8152Publication Date (Print):September 1, 1993Publicat…
The crystal structure of PbTiO 3 film, which was prepared on a Pt/SiO 2 /Si substrate by metal organic chemical vapor deposition, was investigated along with its dielectric properties. The relative dielectric constant increased with increasing film thickness. Crystal structure difference was observed below 0.3 µm of f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacterization of poly(p-phenylene-cis-benzobisoxazole) in methanesulfonic acidD. B. Roitman, R. A. Wessling, and J. McAlisterCite this: Macromolecules 1993, 26, 19, 5174–5184Publication Date (Print):September 1, 1993Publication History Published online1 May 2002Published…
After some introductory remarks on cellulose as a renewable and biodegradable polymer and the relevance of new nonaqueous solvent systems for its processing, a survey is presented on the composition, the method of action and potential applications of these solvent systems, with a distinction between “derivatizing” and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and structural and magnetic studies of diazine-bridged complexes of copper(II) cyanate. Crystal structure of poly[bis(cyanato-N)bis(.mu.-methylpyrazine)copper(II)]Tom Otieno, Steven J. Rettig, Robert C. Thompson, and James TrotterCite this: Inorg. Chem. 1993, 32, 2…
In order to realize nickel electrode multilayer ceramic capacitors with high capacitance per volume, the holmium-doped (Ba, Ca, Mg)(Ti, Zr)O 3 system was studied. In the case of maintaining an oxidizing atmosphere at the cooling stage, the resistivities of the dielectric materials were easily recovered by doping with…
We characterized the fluorescence intensity decays of Indo-1, which is commonly used as an emission wavelength-ratiometric calcium probe. The apparent lifetime of the long-wavelength side of the emission of Indo-1 is dependent on Ca2+. This long-wavelength emission displays the characteristics of an excited-state reac…
During weaving, warp yams are subjected to dynamic loading before stress relaxation during a loom stop. A test method is presented for simulating this behavior. There are three types of relaxation curves—simple relaxation, inverse relaxation, and mixed relaxation—depending on the previous load history of the yam. One…
Abstract A combined optical and electron microscopical study has been carried out of the crystallization habits of poly(vinylidene fluoride) (PVF 2 ) when it is crystallized from blends with noncrystallizable poly(ethyl acrylate) (PEA). The PVF 2 /PEA weight ratios were 0.5/99.5,5/95, and 15/85. Isothermal crystalliza…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFerromagnetism and the .alpha. and .beta. polymorphs of anhydrous copper(II) formate: two molecular-based ferromagnets with ordering temperatures of 8.2 and 30.4 KFernando Sapina, Marcelino Burgos, Emilio Escriva, Jose Vicente Folgado, Dolores Marcos, Aurelio Beltran, and Da…
The influence of heat treatment on corrosion behavior of magnesium-aluminum (Mg-9Al) alloys was investigated by studying the electrochemical properties of Mg-9Al in the solution-treated (T4) and artificially aged (T6) conditions. The alloys' properties were compared to those of pure Mg, the intermetallic Mg17Al12 phas…
We report the results of computer simulation studies for a bulk system composed of chiral particles interacting via the Gay-Berne potential and an additive chiral potential. Using Monte Carlo (MC) simulations in the NVT ensemble, the chirality-temperature plane of the phase diagram was studied at different points by a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFunctionalization of poly(aryl ether ether ketone) (PEEK): synthesis and properties of aldehyde and carboxylic acid substituted PEEKFei Wang and Jacques RooversCite this: Macromolecules 1993, 26, 20, 5295–5302Publication Date (Print):September 1, 1993Publication History Publ…
The POU domain is a highly conserved region found in a number of transcription factors and products of developmental control genes. We report here the isolation and characterization of a POU domain-containing cDNA (POU-M1) from the middle silk gland of Bombyx mori. It encodes a protein with a POU domain identical to t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDesign, synthesis, and structure of the largest trimetallic cluster, [(Ph3P)10Au12Ag12PtCl7]Cl: the first example of a trimetallic biicosahedral supracluster and its implication for the vertex-sharing polyicosahedral growth of the gold/silver/platinum ternary cluster systemB…
A formulation for calculating frequency-dependent hyperpolarizabilities in the Mo/ller–Plesset perturbation theory is presented as the correlation correction to the TDHF approximation. Our quasienergy derivative (QED) method is applied, and the difference between the QED method and the pseudoenergy derivative (PED) me…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUnexpected disproportionation mechanism for proton-transfer reactions between 17-electron metal hydride cation radicals and neutral 18-electron metal hydridesKjell Tore Smith, Christian Roemming, and Mats TilsetCite this: J. Am. Chem. Soc. 1993, 115, 19, 8681–8689Publication…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEarly transition metal porphyrins: synthesis, characterization, and reactivity of novel out-of-plane cis-ligated zirconium porphyrin derivativesHolger Brand and John ArnoldCite this: Organometallics 1993, 12, 9, 3655–3665Publication Date (Print):September 1, 1993Publication…