Materials Literature
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Using photoelectron spectroscopy, the electronic structures of the CMR (colossal magneto-resistance) manganites of Pr1-xSrxMnO3 (PSMO; x = 1/3, 1/2, 2/3), La0.7Ca0.3Mn0.95T0.05O3 (LCMTO; T = Fe, Co. Ni). and La0.7Ce0.3MnO3 (LCeMO) have been-investigated. Mn 2p spectra of PSMO and LCMTO are found to be very similar for…
Edited by D M Brunette, P Tengvall, M Textor and P Thomsen, Springer Verlag: 2001. Cost £147.00 (ISBN 3-540-66936-1) My first response just looking at the flyer for this book was that it was expensive. However, I began to realise the reason for this cost when I picked the book up: it is large, heavy (1.58kg) and extre…
Structural phase transitions in Ca2SiO4 and Sr2SiO4 are investigated by molecular dynamics simulations. The simulations are based on the potentials calculated from the Gordon–Kim modified electron gas formalism extended to molecular ions. We successfully reproduced the transition γ−αH′−α and β−αL′−αH′−α in Ca2SiO4, an…
The stability towards acidolysis of intermediates used in the preparation of core-modified porphyrinic macrocycles was examined. Experiments were performed using analogs of 5-phenyldipyrromethane in which one of the two pyrrole rings was modified (XPM). The XPMs utilized in these studies had X = 2-furyl (OPM), 2-thien…
Low-amplitude constant plastic cyclic deformation of copper single crystals oriented for single slip [123] was carried out at room temperature in air. The plastic shear strain amplitude was 1 × 10−3. The observation of dislocation structure evolution in the early stages of fatigue and the investigation of the formatio…
Structural and chemical characteristics of pitch-based graphitic foam have been studied using scanning electron microscopy, transmission electron microscopy (TEM) and x-ray photoelectron spectroscopy. Chemically, the carbon atoms in these materials are found to have identical bonding states as those in pure graphite s…
Transferrin and albumin are potential macromolecular carriers for improving biodistribution, pharmacokinetic profile and targeting potential of drugs in general. Although the tissue distribution of transferrin and albumin is naturally influenced by their biology and functional role, a series of investigations have sho…
Alternative pretreatments are currently under development in order to avoid the environmental impact produced by using surface finishing processes based on chromates. Some of the environmentally friendly alternatives proposed involve the use of lanthanide based compounds. In this study, conversion coatings on AA5083 (…
The synthesis of (Ca,Mg)-α-sialon powders using slag as a starting material by self-propagating high-temperature synthesis (SHS) is reported for the first time. The only crystalline phase detected in the synthesized products was α-sialon. The characters of the synthesized powders were observed and compared with that o…
Abstract The fundamental methods for the prediction of segregation enthalpy and entropy of any element at any grain boundary are outlined, based on grain boundary segregation diagrams and a linear dependence between segregation entropy and enthalpy. The capability of these methods is evaluated by comparison of the pre…
Dada a extensa área ocupada pelos sedimentos do Grupo Barreiras, é importante conhecer detalhadamente a mineralogia de suas frações. Com este propósito, coletaram-se 11amostras, até 14m de profundidade, em um pacote de sedimentos do Grupo Barreiras no município de Aracruz, estado do Espírito Santo, exposto pela constr…
In this study, fine fractions of bentonites from the Çankırı and Kütahya regions were treated with Na2CO3 and H2SO4. The resulting materials were analysed by X-ray diffraction (XRD), thermogravimetric and differential thermal analyses (TGA, DTA) and infrared (IR) spectroscopy. Surface areas of the samples were also me…
A nickel coupon was exposed to air-saturated water at a pressure of 25.4 MPa and temperatures ranging from 21°C to 460°C in an optically accessible flow cell. In situ Raman spectra were collected at a number of temperatures as the coupon was heated and then cooled. The coupon also was characterized ex situ with Raman…
Abstract A procedure based upon image analysis has been adopted to study the influence of several physical parameters on bubble size in foam. A procedure has been described to account for the distribution of bubble size. Foam was generated in a rotor-stator mixer. In the present research, the nature of the surfactant,…
Polypyrrole and polypyrrole−tetracyanoquinodinodimethane (TCNQ) have been prepared to see the energy band structure modification and associated change in the electrical and optoelectrical properties. The temperature-dependent electrical conductivity of the samples show interesting behavior, namely, higher room-tempera…
A detailed study of the light-induced gratings in Methyl-Red-doped 4-n-pentyl-4′-cyanobiphenyl (5CB) homeotropically aligned is reported. In particular, the dependence of diffraction efficiency upon the pump and probe polarizations has been investigated both for transient and permanent gratings. Our results confirm th…
Abstract The effect of molecular structure (MW, MWD and LCB) on the critical tensile stress (σ c ) for the onset of gross melt fracture (OGMF), proposed in Part I (1) as a material‐dependent criterion for fracture, was determined for a group of polyethylenes varying in structure. These included linear low and high‐den…
In Escherichia coli, the homodimeric Krebs cycle enzyme isocitrate dehydrogenase (EcIDH) is regulated by reversible phosphorylation of a sequestered active site serine. The phosphorylation cycle is catalyzed by a bifunctional protein, IDH kinase/phosphatase (IDH-K/P). To better understand the nature of the interaction…
The melt rheological properties of short sisal fibre reinforced polypropylene composites have been studied using a capillary rheometer. The dependence of the relative composition of component reinforcements and their aspect ratio and also the extent of chemical modification on the overall rheological behaviour have be…
Excellent mechanical properties make γ-Si2AlON3, one of the first spinel sialons and 4-3-spinels, a promising material for structural and abrasive applications. The hardness of this phase synthesized at 13 GPa/1800°C surpasses that of the low-pressure α- and β-sialons, which are used for metal-cutting and engineering…