Materials Literature
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The first bis(porphyrin)actinide complexes have been prepared by reaction of the diethylamide complexes M(NR2)4 (where M = Th, U and R = Me, Et) with 5, 10, 15, 20-tetraphenylporphyrin (H2TPP) or 2, 3, 7, 8, 12, 13, 17, 18-octaethylporphyrin (H2OEP). The coordination geometry of Th(TPP)2 is a distorted square-antipris…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolutions of Poly(dimethylsiloxane) in Supercritical CO2: Viscometric and Volumetric BehaviorRuediger Mertsch and B. A. WolfCite this: Macromolecules 1994, 27, 12, 3289–3294Publication Date (Print):June 1, 1994Publication History Published online1 May 2002Published inissue 1…
Cathodic overpotentials of Ln 0.6 Sr 0.4 MnO 3 (Ln is La, Pr, Nd, Sm, Gd, Yb, and Y) were studied for a new cathode for solid‐oxide fuel cells (SOFCs) with low overpotentials in a relatively‐low‐temperature region. Cathodic overpotentials strongly depended on the rare‐earth cations in the A sites of the perovskite oxi…
The solid-state linkage isomerization [Co(NH3)5NO2]Br2⟺ [Co(NH3)5ONO] Br2 was studied, at room temperature, using the X-ray powder diffraction technique. The structure of the photochemically synthesized [Co(NH3)5-ONO]Br2 was solved in the orthorhombic space group Cmcm, with a = 10.8011(7) Å, b = 8.9692(6) Å, c = 10.…
Abstract This paper reports results on the electrical properties of laminated epoxy composite containing 25 layers of carbon fibers in the form of mats. The dependence of the activation energy (calculated from DC resistivity measurements) on temperature reveals two independent conduction processes. The AC impedance is…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEnd Group Effects on Monolayers of Functionally-Terminated Poly(dimethylsiloxanes) at the Air-Water InterfaceThomas J. Lenk, Daniel H. T. Lee, and Jeffrey T. KobersteinCite this: Langmuir 1994, 10, 6, 1857–1864Publication Date (Print):June 1, 1994Publication History Publishe…
The amino acid DL-lysine has been investigated using the surface-sensitive probe XPS (x-ray photoelectron spectroscopy). The XPS data confirm that solid-state lysine exists in the zwitterionic form. However, during the course of x-ray irradiation in the experiment, the molecule was observed to decompose. A decompositi…
Abstract Rb 2 Sn 3 S 7 · 2 H 2 O wurde durch hydrothermale Reaktion von SnS 2 und Rb 2 CO 3 in einer mit H 2 S gesättigten wäßrigen Lösung bei 190°C synthetisiert. Das Kristallgitter enthält Kettenanionen [Sn 3 S 7 2− ], die sowohl SnS 4 ‐Tetraeder als auch SnS 6 ‐Oktaeder aufweisen. Methanolothermale Reaktion von SnC…
Crystalline silicon carbide (SiC) fiber was produced by a new, simple procedure. Activated carbon fiber (ACF) was reacted with gaseous silicon monoxide and was converted to SiC fiber at elevated temperature and reduced pressure. The reaction was completed at temperatures as low as 1473 K. The reacted fiber consisted o…
Leucine dehydrogenase has been purified to homogeneity from a moderate thermophilic actinomycete, Thermoactinomyces intermedius IFO 14230. The enzyme can be stored without loss of its activity at a low temperature (e.g., 4 degrees C) for over two years. The enzyme was more thermostable at higher concentrations of salt…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLarge photorefractivity in an exceptionally thermostable multifunctional polyimideZhonghua Peng, Zhenan Bao, and Luping YuCite this: J. Am. Chem. Soc. 1994, 116, 13, 6003–6004Publication Date (Print):June 1, 1994Publication History Published online1 May 2002Published inissue…
Abstract Treatment with 2,3‐dichloro‐5,6‐dicyano‐1,4‐benzoquinone (DDQ) oxidized 2,6‐diethyl‐1,3,5,7,8‐pentamethylpyrromethene–BF 2 complex 1 , 13,14‐trimethyl‐2, 3, 4, 5,9,10,11,12‐octahydroindomethene–BF 2 complex 5 , and 1,3,5,7,8‐pentamethyl‐1,2,3,5,6,7‐hexahydropyromethene–BF 2 complex 8 to the weakly fluorescent…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolylactones. 28. Syndiotactic Poly(.beta.-D,L-hydroxybutyrate) by Ring-Opening Polymerization of .beta.-D,L-Butyrolactone with Butyltin MethoxidesHans R. Kricheldorf, Soo-Ran Lee, and Nico ScharnaglCite this: Macromolecules 1994, 27, 12, 3139–3146Publication Date (Print):Ju…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSubvalent Ternary Silver Oxides: Synthesis, Structural Characterization, and Physical Properties of Pentasilver Orthosilicate, Ag5SiO4Christoph Linke and Martin JansenCite this: Inorg. Chem. 1994, 33, 12, 2614–2616Publication Date (Print):June 1, 1994Publication History Publ…
The mechanisms contributing to densification during non‐isothermal heat treatments in sol‐gel titania films have been studied. At low temperatures, shrinkage is attributed to condensation reactions between hydroxyls located primarily within the oxide skeleton. At higher temperatures, densification is due to both conti…
This paper deals with the stresses generated during high temperature oxidation and their relationship to scale fracture. In the first part, the objective is to differentiate growth stresses from thermal stresses and give evidence for relaxation phenomena. The results obtained for materials which develop NiO, Cr2O3 or…
Summary Changes in soil and biogeochemical processes following the replacement, 60 years ago, of part of a deciduous forest by a coniferous stand were evaluated by (i) a balance‐sheet approach using soil and biomass element content analyses and the mineral flux, and (ii) the inclusion of test‐mineral and resin bags in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectroless Plating of Organic Thin Films by Reduction of Nonionic Surfactants Containing an Azobenzene GroupTetsuo Saji, K. Ebata, Kazuhiro Sugawara, Shunlin Liu, and Ken KobayashiCite this: J. Am. Chem. Soc. 1994, 116, 13, 6053–6054Publication Date (Print):June 1, 1994Publ…
The crystalline structure of the heavy alkaline earth chalcogenide SrSe was studied at high pressure by x-ray diffraction using a synchrotron source. The NaCl-type (B1) structure of SrSe was found to be stable on loading to 14.2 GPa where the CsCl-type (B2) structure was evidenced with a 10.7% decrease in relative ato…
We have measured partially angle-integrated photoemission with linearly polarized undulator radiation on the valence band and on the 3p and 3s core levels of iron in an Fe(100) single crystal. A large asymmetry is measured for 3p core levels when reversing the magnetization direction perpendicular to the photoemission…