Materials Literature
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An apparatus was developed to study water-transport behaviour along yarns. The rise of the liquid water in the yarn triggered an electrical circuit which was coupled with a personal computer, and so the distance of water rise as a function of time was determined. To smooth the data, the method of least squares was app…
The sinterability of two industrial mullite powders, in the presence of MgO as a sintering aid, was investigated. A glassy phase, which was generated during preparation, was present in both powders; this glassy phase had a strong influence on sintering, depending on its content, composition, and spatial distribution.…
In order to develop high energy Nd-Fe-B magnets, extensive studies of processing technologies have been done. With a new casting technology for Nd-Fe-B alloys, improvement of the preparation of fine powders having a sharp distribution of particle size, and adoption of a special CIP process, we have succeeded in obtain…
The influence of small substitution of iron with rare-earth cations in nickel zinc ferrites has been investigated. Samples with overall composition Ni0.50Zn0.51Fe1.96R0.04O4+δ (R = Pr, Nd, Eu, Ho, Tm, Lu) were prepared by a wet chemical route. The substitution of iron by rare-earth cations results in the formation of…
FT Raman study of 5-fluorouracil, an anticarcinogenic drug, was carried out. Ab initio and density functional computations of the vibrational spectrum, the molecular geometry, the atomic charges, the total energy, the zero point energy, the rotational constants, the room temperature entropy, (translational, rotational…
Mixed oxides based on nickel, cerium and aluminum, effective in the catalytic hydrogenation of unsaturated compounds, were prepared by a coprecipitation route and studied by XRD, TEM, XPS and ion sputtering techniques. The CeNixOy mixed oxides (0⩽x⩽1) can be described as a mixture of nickel oxide and ceria modified by…
Research Article| March 01, 2000 Self-sedimented diatom mats as agents of exceptional fossil preservation in the Oligocene Florissant lake beds, Colorado, United States Ian C. Harding; Ian C. Harding 1School of Ocean and Earth Science, University of Southampton, European Way, Southampton SO14 3ZH, UK Search for other…
Five complexes, [Ag6(bmimen)5(MeCN)][CF3SO3]6·H2O 1, [Ag7(bmimen)6][ClO4]7·MeCN 2, [Ag2(bmimen)2][NO3]2· 0.5H2O 3, [Ag3(bmimpn)2][CF3SO3]34 and [Ag3(bmimpn)2]n[NO3]3n5, were obtained by self-assembly of AgX (X = CF3SO3−, ClO4− or NO3−) with bmimen and bmimpn (bmimen = 1,2-bis[(1-methyl-2-imidazolyl)methyleneamino]etha…
The direct reaction between ferrocene and an excess of molten 4-azabenzimidazole yielded amber-green crystals of polybis(4-azabenzimidazolato)iron(II), 1. Single crystal X-ray diffraction studies revealed tetrahedrally coordinated iron ions linked by single imidazolate bridges and forming a 3-D single diamond-like (di…
Silica-supported nickel catalysts with both macropores and mesopores were prepared in an alkoxide-derived sol–gel process in the presence of poly(ethylene oxide) (PEO) with an average molecular weight of 100000. In this process, the interconnected macroporous morphology is formed when transitional structures of spinod…
The metathesis reaction of propene under photoirradiation was performed over two types of mesoporous silica materials, FSM-16 and MCM-41, and amorphous silica evacuated at high temperature. The activity increased with increasing evacuation temperature, and moreover, prehydration treatment before evacuation influenced…
Recently, Alves et al. have suggested a new orthorhombic lattice system as a possible form for the graphitic C3N4 model structure. For this new phase, some modifications in the electronic properties are expected with respect to the hexagonal variety previously proposed by Teter and Hemley. A theoretical investigation…
Many textile properties have traditionally been assessed using subjective methods dependent upon one or more of the human senses. It is generally accepted that these methods can be unreliable, and the development of more reliable and consistent objective measurement systems is a key objective for textile scientists. I…
Scaling of gold, bronze, and stainless steel was investigated in synthetic fresh and seawater. It is shown that the calcium carbonate precipitation rate increased from stainless steel, to bronze and then to gold whatever the composition of the scaling water. The morphology of the deposited scale depended on the substr…
MoO3/TiO2 catalysts prepared by impregnation of anatase with ammonium heptamolybdate have been investigated with the aim of understanding their redox chemistry and the coordination state of surface active species. Adsorption of ammonia has been followed by FTIR and by EPR on thermally treated, partially reduced sample…
The kinetics of thermal degradation of polyurethanes (PUR) has been studied by means of high-resolution and constant heating rate thermogravimetry (TG), under nitrogen and synthetic air atmospheres. The high-resolution TG provided a way to increase resolution with decreasing the time of data acquisition. In this mode,…
An electron‐transfer reaction takes place in the ground state between phthalocyanines (as electron‐donors) and pyrylium cations (as electron‐acceptors) in polar solvents, reaction which leads to the phthalocyanine radical‐cations as evidenced by its absorption spectra identical to the one of the species formed by elec…
Glucuronamide-based bolaamphiphiles are found to form a reversible, linear polymolecular array, via a boronate ester linkage attached to the 1,2-positions of the pyranose or furanose ring, upon complexation with an aromatic boronic acid-based homologue in aqueous solutions.
Recent years have seen a considerable development in the availability of single-crystal diffraction facilities with synchrotron radiation for use in non-biological crystallography, with access to several suitable beam-lines around the world. These can markedly extend the range of materials for which a full crystal str…
We have previously demonstrated that liposome encapsulation of doxorubicin (DOX) can alleviate adverse interactions with non-encapsulated DOX and the cyclosporine multidrug-resistant (MDR) modulator Valspodar. We have now investigated the behavior of different liposomal DOX formulations in MDA435LCC6/MDR-1 human breas…