Materials Literature
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Nickel (Ni) and electroless nickel (EN) coatings are used extensively in caustic soda (NaOH) service. The corrosion resistance of an EN coating is dependent upon phosphorus (P) content, but not in the trend expected. High-phosphorus EN (HPEN) coatings have poorer corrosion resistance in hot, concentrated sodium hydrox…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystallization Kinetics of Low Molecular Weight Fractions of Branched PolyethylenesW. Scott Lambert and Paul J. PhillipsCite this: Macromolecules 1994, 27, 13, 3537–3542Publication Date (Print):June 1, 1994Publication History Published online1 May 2002Published inissue 1 Ju…
It is shown that, for a tilted birefringent plate (BP) with its optic axis parallel to the plate surface, an explicit Jones transformation matrix can be derived without neglecting the birefringent splitting.Differences in calculating the desired thickness(es) of a BP by use of different formulas of phase difference be…
ADVERTISEMENT RETURN TO ISSUEPREVArticleTricontinuous Double-Diamond Structure Formed by a Styrene-Isoprene-2-Vinylpyridine Triblock CopolymerYushu Matsushita, Masaki Tamura, and Ichiro NodaCite this: Macromolecules 1994, 27, 13, 3680–3682Publication Date (Print):June 1, 1994Publication History Published online1 May 2…
A new method for the quantification of montmorillonite by full-profile Rietveld analysis of the XRD profile is presented. A measured standard XRD pattern of Algerian bentonite was used to construct a universally applicable montmorillonite ( hkl ) file for use with a P.C. based Rietveld XRD quantitative analysis system…
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…