Materials Literature
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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…
This paper focuses on accelerated testing procedures that can be applied to XLPE and EPR for high voltage cables and that are aimed to achieve the thermo-electrical endurance characterization of insulation. Several methods and techniques for single and combined thermo-electrical stress are illustrated; indices for the…
Multilayer ZnS/CdS thin films were grown on glass, ITO-covered glass and (100)GaAs substrates by successive ionic layer adsorption and reaction (SILAR) technique at room temperature and ambient pressure. The layers in multilayer thin film structures were nominally 1–6 nm thick and the amount of layers varied so that t…
Ribokinase phosphorylates ribose to form ribose-5-phosphate in the presence of ATP and magnesium. The phosphorylated sugar can enter the pentose phosphate pathway or be used for the synthesis of nucleotides, histidine, and tryptophan. Ribokinase belongs to the PfkB family of carbohydrate kinases, for which no three-di…
Abstract A method of synthesis for cadmium selenide and cadmium telluride clusters is proposed. PhSeSiMe 3 reacts with [CdCl 2 (PPh 3 ) 2 ] to yield a series of cadmium selenide clusters depending on the kind of solvent used. The reaction of PhTeSiMe 3 with CdCl 2 and PEt 3 yields a cadmium telluride cluster. Crystall…
A variety of spectroscopic methods have been used to deduce the solid-state structure of Ag 2 [S(CH 2 ) 5 S] ( 1 ), the yellow compound formed by mixing of Ag + and 1,5-pentanedithiol. Solid-state reflectance UV−vis, X-ray diffraction, cross-polarization magic angle spinning (CPMAS) 13 C NMR, and CPMAS 109 Ag NMR spec…
A range of sub-micron size three-layer toughening particles have been prepared by sequential emulsion polymerization, each type of particle comprising a glassy polymer core, a rubbery inter-layer and an outer layer of glassy polymer, which was functionalized using either glycidyl methacrylate or methacrylic acid. Each…
Abstract Extended X‐ray absorption fine structure analysis (EXAFS) has been used to study supported TiCl 4 /MgCl 2 catalysts containing 1.8 wt.‐% Ti. Adsorbed TiCl 4 was found to exist on the MgCl 2 surface as a dimeric complex. The possible structures of dimeric TiCl 4 complexes on the (100) face of MgCl 2 are discus…
Abstract Degradation of hydrogenated styrene—butadiene rubber (HSBR) having different levels of unsaturation has been studied over a wide range of temperatures under anaerobic and aerobic conditions using thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), IR and NMR spectroscopy. TGA data indic…
Solid state 13 C NMR is used to identify the conformation of alanine residues in minor ampullate gland silk from Nephila clavipes and in a genetically engineered protein based on the consensus sequence of MaSp2, a protein present in low concentrations in major ampullate gland silk. The results of the NMR on minor ampu…