Materials Literature
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SUMMARY X‐ray microanalysis of non‐biological and biological specimens was carried out in the environmental scanning electron microscope (ESEM) under different conditions of specimen distance (the distance travelled by the electron probe within the specimen chamber) and chamber atmosphere. Using both water vapour and…
The occurrence of cop-like copper resistance determinants homologous to the cop genes of Pseudomonas syringae among bacteria isolated from a water distribution system experiencing copper corrosion was investigated in this study. It was found that at least 49% of the copper-resistant bacteria and less than 15% of the c…
Abstract There is considerable uncertainty about the extent of mineral weathering and neosynthesis in arid soils. Although researchers have speculated that smectite neosynthesis can occur in soils containing opaline silica cement, no evidence has been presented to support this hypothesis. We investigated the mineralog…
The simulation of the structure of aromatic and quinoid poly(isothianaphthene) (PITN) has been improved, by the synthesis of new model compounds. The C-13 NMR investigation confirms our previous results that the geometric structure of this low-band-gap conducting polymer shows a strong quinoid character. For the aroma…
Abstract The effect of temperature over the range −196 to 150°C on the crosslinking of polyethylenes irradiated by electron beam has been investigated on the basis of gel content determination and Fourier transform infra‐red (FTIR) spectroscopy. The crosslinking efficiency increases significantly with increasing irrad…
Fermi level shift in n-type perylene pigment film was measured by the Kelvin vibrating capacitor method. Purification of pigment by reactive sublimation under methylamine atmosphere caused negative shift of the Fermi level due to the effective removal of unknown but specific impurity acting as an acceptor. On the othe…
Shape memory alloys (SMA) have recently been proposed and demonstrated for several active control applications. However, there is only limited experimental information available on the properties of the SMA. The present paper focuses on variations of the dynamical Young's modulus, the damping characteristics, and the…
Abstract The use of functionalised 2,2':6',2″‐terpyridines and multi‐domain ligands based upon this metal‐binding motif for the assembly of co‐ordination oligomers is discussed. The extension of the methodology to the preparation of helical polymers is demonstrated.
The synthesis and characterization of a new series of mono-, di-, and trinuclear Cr(II) borohydride compounds is described. The reaction of CrCl 2 (TMEDA) with two equivalents of NaBH 4 afforded the thermally unstable (TMEDA)Cr(BH 4 ) 2 (1), which was converted by treatment with pyridine into the octahedral monomeric…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIntramolecular Pyrene Excimer Probing the Sol-Gel ProcessL. M. Ilharco, A. M. Santos, M. J. Silva, and J. M. G. MartinhoCite this: Langmuir 1995, 11, 7, 2419–2422Publication Date (Print):July 1, 1995Publication History Published online1 May 2002Published inissue 1 July 1995h…
A high-pressure X-ray diffraction study has been performed on a perfect icosahedral Al62Cu25·5Fe12·5 (i-(Al—Cu—Fe)) phase at room temperature up to 33·5 GPa using a diamond-anvil cell to determine the equation of state. X-ray diffraction was undertaken in energy-dispersive mode on a synchrotron beam line. The remarkab…
When subjected to severe thermal shock, ceramics suffer strength degradation due to the damage caused by the shock. A fracture‐damage analysis is presented to study the effects of damage on the thermal shock behavior of ceramics. It is assumed that a narrow strip damage zone is developed at the tip of a preexisting cr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and Properties of New Polyamides Based on DiamantaneYaw-Terng Chern and Wen-Liang WangCite this: Macromolecules 1995, 28, 16, 5554–5560Publication Date (Print):July 1, 1995Publication History Published online1 May 2002Published inissue 1 July 1995https://pubs.acs.o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDimetal Hepta- and Octaalkoxide Anions of Molybdenum and Tungsten, M2(OR)7- and M2(OR)82- (M.tplbond.M). Preparation, Structures, Oxidation, and a Study of the Thermal Decomposition of W2(OR)7- to Give W2(H)(O)(OR)6- Where R = tBu and iPrT. A. Budzichowski, M. H. Chisholm, K…
The thermal expansion coefficients and glass transition temperatures of Y‐Mg‐Si‐Al‐O‐N glasses were measured using dilatometry. The thermal expansion coefficients of these glasses could be calculated on the basis of composition, using experimentally determined thermal expansion prefactors .
Three-dimensional textiles are those materials which have a system or systems in all the three axes of plane. These offer particular properties, such as interlaminar shearing force, and mechanical and thermal stability along all three axes of space, which are not achievable with other reinforcements. The demand for th…
For many years, the petroleum industry has employed martensitic stainless steels for wellhead and valve applications, and increasing use has been made of 13%Cr-4%Ni alloys. This material type was originally developed as a cast alloy (e.g., ASTM A487/A487M-89a Grade CA6NM). The combination of a low-carbon content and t…
Abstract Double yield points before necking were observed in injection molded specimens of poly(tetramethylene terephthalate) (PTMT) and its copolymers under tensile loading. The first yield is associated with deformation of the amorphous region and the second yield is caused by the alpha to beta transition of PTMT cr…
The fact that mercury is released from dental amalgam restorations after abrasion provides a source of continued controversy over the safe use of this material. Studies have shown that the amount and rate of mercury release vary for different amalgam products. The objective of this study was to determine how alloy com…
The Curie temperature of dysprosium films epitaxially grown on yttrium and on erbium is shown to increase continuously with the epitaxial strain induced along the c -axis. This variation is correlated to modifications of the α strains, of the γ distortion and of the exchange energy barrier. The evolution of these diff…