Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
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…
Abstract The voltammetry of the molybdosilicate and molybdophosphate complexes, formed by the addition of hexafluorosilicate and phosphate to anacidic sodium molybdate solution, have been defined at gold microdisk electrodes. It is shown that the reaction conditions influence both the kinetics of formation of the comp…
The nucleation of corrosion pits on stainless steel in chloride environments is described in terms of minute transient currents recorded under high resolution. Nucleation is fast, showing a rise time less than 1 ms, and is ascribed to rupture of the passivating oxide film, caused by the formation of microscopic patche…
Adsorption experiments for benzotriazole, (BTAH) on the γ-Al 2 O 3 surface were carried out at 150 and 293 K. The thermal stability of the adsorbed layer was investigated. At low temperatures, adsorption results in the production of a thick condensed layer of BTAH. Strong intermolecular hydrogen bonds are observed. Wi…
A Nd:YAG laser was used for joining a pseudoelastic Ti-51.5 at.% Ni shape memory alloy. Tensile tests on sheet metal of 0.5 mm thickness were performed at temperatures of -40C, +20C and 1 10C, representing the martensitic, pseudoelastic and austenitic condition, respectively. Laser-welded specimens exhibited an ultima…