Materials Literature
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The adsorption of the cationic dye rhodamine 6G by montmorillonite (Wyoming bentonite) and laponite (synthetic hectorite) was studied by visible and fluorescent spectroscopy and by X-ray diffraction methods. Adsorption of the dye takes place by the mechanism of cation exchange. X-ray data indicate that the adsorbed ca…
The photodarkening effect in evaporated As2S3 films has been studied. Optical transmissivity was measured and its dependence on intensity, wavelength, temperature and previous thermal history was found. A structural investigation was also made using Raman spectroscopy. A feature at 231 cm−1 in the Raman spectra, which…
The scanning electron microscope (SEM) is usually operated with a beam voltage, V0, in the range of 10-30 kV, even though many early workers had suggested the use of lower voltages to increase topographic contrast and to reduce specimen charging and beam damage. The chief reason for this contradiction is poor instrume…
Abstract The kinetics of phase segregation of segmented linear polyurethanes, from a homogeneous single‐phase system into a two‐phase one, have been studied by measuring the heat capacity change at the glass transition of the soft phase. The extent of phase segregation at equilibrium is a linear function of the Flory–…
The electronic and magnetic properties of the (100) and (110) surfaces of ferromagnetic iron and the ferromagnetic iron-cobalt ordered alloys are calculated self-consistently. It is found that (a) in pure bcc iron the spin polarization increases from a bulk value of 2.12 to 2.90 at the (100) surface and to 2.55 at the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAtomic and group electronegativitiesJohn MullayCite this: J. Am. Chem. Soc. 1984, 106, 20, 5842–5847Publication Date (Print):October 1, 1984Publication History Published online1 May 2002Published inissue 1 October 1984https://pubs.acs.org/doi/10.1021/ja00332a014https://doi.o…
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The electrical properties of the solid solutions between stabilized zirconia and ceria, with , have been investigated, between 1273 and 1673 K, in a large range of oxygen partial pressures. The total electrical conductivity and the concentrations of the various charge carriers, determined through thermogravimetry and…
Machine learning (ML) is transforming all areas of science. The complex and time-consuming calculations in molecular simulations are particularly suitable for an ML revolution and have already been profoundly affected by the application of existing ML ...Read More
Abstract Lap shear adhesion between laminated sheets of polycarbonate and styrene/acrylonitrile copolymers exhibits a sharp maximum when the acrylonitrile content of the copolymers is in the range of 25–27% by weight. Observations of shifts in glass transitions of the two phases in melt‐mixed polycarbonate/SAN blends…
A previously described technique for measuring the order of phase transitionsl-3 using DSC has been applied to the liquid crystalline transitions found in TBBA. All of the values obtained were in agreement with those that have been measured by other techniques, and also with what would be anticipated from the nature o…
Oxidation of wustite‐type solid solutions (A, B)0 and reduction of sesquioxide solid solutions (A, B) 2 0 3 can lead to the precipitation of a spinel phase (A, B) 3 0 4 at an inner reaction front. A representation of the reaction scheme and kinetics for each of the two cases will be given. Observations on the macrosco…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyoxotungstate anions containing high-valent rhenium. 1. Keggin anion derivativesFernando Ortega and Michael T. PopeCite this: Inorg. Chem. 1984, 23, 21, 3292–3297Publication Date (Print):October 1, 1984Publication History Published online1 May 2002Published inissue 1 Octo…
Shear piezoelectricity is observed in uniaxially oriented system of optically active biopolymers such as polysaccharides, polypeptides and polynucleotides. The magnitude of the piezoelectric constant is proportional to the degree of crystallinity, the degree of orientation and the piezoelectric constants in single cry…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemistry and structure of hexakis(thiourea-S)technetium(III) trichloride tetrahydrate, [Tc(SC(NH2)2)6]Cl3.4H2OM. J. Abrams, A. Davison, R. Faggiani, A. G. Jones, and C. J. L. LockCite this: Inorg. Chem. 1984, 23, 21, 3284–3288Publication Date (Print):October 1, 1984Publicat…
Abstract The influence of crystallinity and crosslinking on the depression of the glass transition temperature in nylon 6 by water has been investigated by dynamic mechanical methods. Radiation crosslinking by high‐energy electrons was effective in preventing morphological changes during the measurement of the increme…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA molecule containing the OWOWO unit. Synthesis, structure and spectroscopy of hexaneopentylditungsten trioxideIrene Feinstein-Jaffe, Dan Gibson, Stephen J. Lippard, Richard R. Schrock, and Alan SpoolCite this: J. Am. Chem. Soc. 1984, 106, 21, 6305–6310Publication Date (Prin…
Abstract Sulfate adsorption on kaolinite was followed at 0.7 μ eq/ml to 99 μ eq/ml solution concentrations at 30°C and at pH 6.0, and the amount of OH~ ions released and the change in surface charge were determined. Sulfate was adsorbed at positive and neutral sites by displacing OH 2 and OH − groups, respectively. Ad…
The magnetic structure of the hexagonal polymorph of FeGe has been investigated by means of neutron diffraction on single crystals at low temperature and for magnetic fields applied perpendicular to the c axis. Between 410 and approximately 55K the magnetic structure is collinear c-axis antiferromagnetic. Below approx…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and structure of the first cyclodiphosphazene. Dimerization of a phosphonitrile :P.tplbond.NAntoine Baceiredo, Guy Bertrand, Jean Pierre Majoral, Ghislaine Sicard, Joel Jaud, and Jean GalyCite this: J. Am. Chem. Soc. 1984, 106, 20, 6088–6089Publication Date (Print)…