Materials Literature
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The effects of elevated levels of dissolved carbon dioxide (dCO2), produced by gassing with CO2-enriched gas mixtures, upon an industrial strain of Aspergillus niger (strain A60) producing citrate and gluconate were quantitatively assessed. Particular attention was paid to the reliability and accuracy of the steam-ste…
Experiments were performed with binary metal alloys to validate a continuum mixture model for alloy solidification. Ingots of two compositions, Pb-20%Sn and Pb-40%Sn, were cast in a permanent mold, and the solidification process was simulated. Temperature histories were measured during casting, and composition profile…
Localized corrosion phenomena, including pitting corrosion, stress corrosion cracking, and corrosion fatigue, are the principal causes of corrosion-induced damage in electric power-generating facilities and typically result in more than 50 percent of the unscheduled outages. In this paper, we describe a deterministic…
The use of collagen as a biomedical implant raises safety issues with regard to viruses and prions. Specific chemical agents that inactivate prion infectivity could be applied to collagen implants. The physicochemical changes and the in vitro and in vivo biocompatibility of collagen treated by formic acid (FA), triflu…
Electrochemical studies were performed on LaNi 5 − x Ge x metal hydride alloys with 0 ⩽ x ⩽ 0.5 . We carried out single‐electrode studies to understand the effects of the Ge substituent on the hydrogen absorption characteristics, the electrochemical capacity, and the electrochemical kinetics of hydrogen absorption and…
A variety of smectic phase diagrams involving smectic-isotropic and smectic-nematic-isotropic transitions have been calculated based on a combination of Flory–Huggins (FH) theory for isotropic mixing and Maier–Saupe–McMillan (MSM) theory for smectic-A ordering of liquid crystals (LC). To describe the mesophase transit…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTStable Carbanions by Quantitative Metalation of Cationically Obtained Diphenylvinyl and Diphenylmethoxy Compounds: New Initiators for Living Anionic PolymerizationsJesper Feldthusen, Béla Iván, and Axel H. E. MüllerView Author Information Institut für Physikalische Chemie, Univ…
A pressurized differential scanning calorimeter (PDSC) has been used to obtain information on the combustion characteristics of crude oils and their mixtures in two chemically different matrix materials, sand and limestone. Crude oil and sand−limestone mixtures were prepared to give a composition of 10 wt % crude oil…
Abstract Liquid‐crystalline monomers containing two vinyl groups, two mercapto groups, or a 1:1 combination of the two have been synthesized and characterized in terms of their mesomorphic properties. These monomers can be photopolymerized in situ in an appropriate ratio of vinyl and mercapto groups to form highly ord…
A long-standing and important problem in glass science has been carrier-type reversal (CTR) in semiconducting glasses. This phenomenon is exhibited by Pb−Ge−Se glasses also. It has been addressed here by carrying out detailed electrical, thermal, and spectroscopic investigations. Pb x Ge 42 - x Se 58 ( x = 0−20) glass…
[Pt 2 (PPh 3 ) 4 (μ-S) 2 ] ( 1 ) reacts with AgCl(PPh 3 ) and CuCl under a mild pressure of CO (60 psi) to give [Pt 2 (CO)(PPh 3 ) 3 (μ 3 -S)MCl] [M = Ag ( 4 ) and Cu ( 6 )] via the intermediates [Pt 2 (PPh 3 ) 4 (μ 3 -S) 2 Ag(PPh 3 )]Cl ( 2a ), [Pt 2 (PPh 3 ) 5 (μ 3 -S) 2 AgCl] ( 3 ), and [Pt 2 (PPh 3 ) 5 (μ 3 -S) 2…
A family of bis(porphyrin) zirconium sandwich complexes containing octaethylporphyrin (OEP) and octaethyltetraazaporphyrin (OETAP) was synthesized and characterized by UV−vis and NMR spectroscopies. The two ligands are structural analogues yet have dramatically different redox properties (the redox potentials of OETAP…
Summary Venter, H. J. T. & Verhoeven, R. L.: A tribal classification of the Periplocoideae (Apocynaceae). – Taxon 46: 705‐720. 1997. – ISSN 0040‐0262. The diagnostic features used to delimit genera are enumerated and critically analysed. Floral characteristics are important: shape and depth of the corolla tube, an…
In the past two decades, the assessment of thermal risks linked to the practice of chemical reactions on an industrial scale has made great progress. Nowadays chemists understand these risks and are able to assess them. Nevertheless, incidents still occur which indicate that some weaknesses still exist, especially in…
Several primary amines (R-NH(2)) were converted to their corresponding O-benzoyl protected hydroxamates under biphasic conditions. The intermediate (benzoyloxy)amines (R-NHOCOPh) were generated using benzoyl peroxide dissolved in CH(2)Cl(2) and an aqueous carbonate buffer (pH 10.5) at room temperature. Subsequent acyl…
Shape memory alloys exhibit a high damping capacity in the mktensite state. Results obtained from both DMA and cyclic tests under tension-compression load show that the martensite damping capacity in NiTi SMAs is a function of both strain amplitude and annealing temperature. Internal friction due to movements of marte…
Polymerizable organic silane molecules such as 3-(trimethoxysilyl)propylmethacrylate (γ-MPS) have been grafted onto the surface of ZrO2 powders, via hydroxyl groups, to obtain hybrid ‘macromonomers’. A combination of x-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FTIR) spectroscopy and 29Si nuclea…
Nanostructured silica powders are synthesized by a nonpyrolytic, room-temperature aero-sol−gel process. Hydrolysis and condensation of tetraethoxysilane (TEOS) and tetramethoxysilane (TMOS) precursors produce nanosized silica powders that have specific surface areas greater than 400 m 2 /g. This paper reports on a nov…
The transmission electron microscopy in-situ straining technique is employed to measure the breaking angles of strengthening precipitates in aluminium alloy 6056-T6 as they are sheared by dislocations. The experimental determination of the character of bowed dislocation segments when dislocations are pinned on precipi…
A heavily silicified sub-spherical diatom occurring abundantly close to the upper limits of marine facies in the sedimentary sequences recording a Holocene transgression is named and described; Pseudopodosira kosugii sp. nov. Observations on this form in a recent habitat and growing in cultures show that it grows vege…