Materials Literature
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The series LixNbS2 (0 ≤ x ≤ 0.50) and LixNbSe2 (0 ≤ x ≤ 0.67) have been prepared by high-temperature reaction of Li2S, Nb, and S or Li2Se, Nb, and Se. Structures have been determined by analysis of X-ray powder patterns with polytypism observed in the sulfide series. Evidence of staging and Li ordering is reported, an…
Abstract Die neuen Verbindungen Ba 2 SiSe 4 und Ba 2 SiTe 4 kristallisieren monoklin (Raumgruppe: P2 1 /m, Nr. 11) in der Sr 2 GeS 4 ‐Struktur mit den Gitterkonstanten Ba 2 SiSe 4 : a = 918,4(5) pm, b = 703,3(3) pm, c = 687,2(3) pm, β = 109,2(1)° Ba 2 SiTe 4 : a = 965,0(5) pm, b = 762,6(3) pm, c = 746,6(3) pm, β = 108…
Calorimetric measurements were carried out to investigate the solid state polymorphism of MBBA. Conditions for the production of a glassy liquid crystal phase were studied. The DSC experiments proved the existence of two independent modes of phase transition: (i) a sequence of irreversible transitions based on a molec…
Abstract Ferulic acid (= 4‐hydroxy‐3‐methoxycinnamic acid) was condensation polymerized at temperatures between 0 and 50°C in bulk or various solvents, using thionyl chloride as activator in the presence or absence of bases. Depending on reaction conditions, true relative yields up to 100% and reduced viscosities (at…
The crevice corrosion susceptibility of cold-worked Type 316LVM stainless steel, cast Co-Cr-Mo, wrought Co-Cr-W-Ni, non-nitrided and nitrided Ti-6Al-4V ELI, and c.p. Ti, Grades 1 and 4, was studied in vitro by means of a crevice cell. Occlusion was created by interfacing a disc specimen and a Teflon bar. Specimens wer…
For elastomers to be used in vacuum applications, their permeability should be low. Elastomers that are now, or likely to be, used in vacuum have been studied. The permeability of copolymers of fluoroelastomers and PTFE propylene (AFLAS) and a homopolymer of epichlorohydrin have been measured for hydrogen, helium, arg…
Segmentation of large areas of light microscopic slides into N by N fields, and each of these fields into M digital image tiles, allows the scanning, storage and digital processing of large images. Any of the original N2 fields or composites of M adjacent tiles can be recalled to the video display for analysis. Develo…
Abstract Optical absorption spectra and electrical resistivity measurements are given of ruthenium‐doped TiO 2 . The effect on the system of doping with shallow donors (Ta, Nb) and of reducing in vacuum and in hydrogen is investigated. The results are discussed in view of recent EPR, Mössbauer, and thermogravimetric m…
Surface-sensitive core-level photoelectron spectra excited by synchrotron radiation are presented for surface oxide phases of W in the monolayer range. Discrete chemically shifted core levels are observed and are shown to be associated with specific formal oxidation states by comparison with bulk reference compounds.…
A mineral medium for studying the growth of Nitrosomonas europaea was developed and examined. The medium was defined in terms of chemical speciation by using chemical equilibrium computer models. The medium significantly increased the metabolic activity of the organisms compared with previously developed media, yieldi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLuminescence properties of europium(3+)-doped rare-earth oxyhydroxidesJorma Holsa, Tuula Leskela, and Markku LeskelaCite this: Inorg. Chem. 1985, 24, 10, 1539–1542Publication Date (Print):May 1, 1985Publication History Published online1 May 2002Published inissue 1 May 1985ht…
Abstract Durch „Reaktion mit der Wand”︁ wurden, meist neu, Einkristalle der Oxide A 4 [M 4 O 4 ] mit M = Cu, A = LiRb bzw. M = Ag, A = Na, Rb, Cs dargestellt und die Kristallstrukturen verfeinert. Bez. Gitterkonstanten und Lageparameter s. Text. Der „Ring”︁ [M 4 O 4 ] 4− ist nur bez. des M 4 ‐Teiles eben, die O 2− si…
Abstract A comparison was made of acid hydroxylamine and acid ammonium oxalate methods for extracting Fe and Al from three clay mineral (chlorite) samples and 27 soil samples. Although the hydroxylamine solution was more acid than the oxalate solution, the hydroxylamine extraction did not increase dissolution of the c…
In the present study, vanadium oxide films were grown on water-cooled sapphire, silicon, and glass substrates by reactive sputter deposition using a vanadium target and rf-excited argon discharges containing 0%–25% oxygen. Optical emission spectroscopy was used for in situ discharge diagnostics. Films were characteriz…
Abstract A series of ten commercial tread-grade carbon blacks were evaluated in a 60/40 NR/BR truck tire tread formulation. A number of important physical properties and performance criteria were assessed in terms of carbon black surface area and DBPA. Significant response equations were obtained for viscosity, bound…
Abstract meso ‐Tetraalkylporphyrinogens are easily formed and unexpectedely stable compounds. Only through forced oxidation can they efficiently be converted into porphyrins. meso ‐Tetraphenylphlorin was trapped as an intermediate in the Rothemund meso ‐tetraphenylporphyrin synthesis.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal decomposition of formamide: shock tube experiments and ab initio calculationsTerumitsu Kakumoto, Ko Saito, and Akira ImamuraCite this: J. Phys. Chem. 1985, 89, 11, 2286–2291Publication Date (Print):May 1, 1985Publication History Published online1 May 2002Published in…
The dynamic contact angle for a contact line moving over a solid surface with random sparse spots of roughness is determined theoretically in the limit of zero capillary number. The model exhibits many of the observed characteristics of moving contact lines on real rough surfaces, including contact-angle hysteresis an…
Spectroscopic methods, i.e., Fourier transform infrared (FT-IR), carbon-13 nuclear magnetic reasonance (13C NMR), and ultraviolet (UV) spectroscopy, were used to investigate the actual chemical composition of oilfield corrosion inhibitors. Inhibitor formulations consisting of an amide or imidazoline reacted with a dim…
Dialkyl fumarates with bulky ester substituents were found to homopolymerize easily in the presence of 2,2′-azobisisobutyronitrile. Among these fumarates, diisopropyl fumarate (DiPF) homopolymerized with the above initiator (20mmol/1) in bulk at 40∼60°C to give homopolymers with number-average molecular weight of 70 0…