Materials Literature
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Methylene Blue adsorption isotherms from aqueous solution at 25 °C, and diffuse reflectance spectra of the adsorbed dye have been used to examine aluminosilicate gels and zeolite X formed during hydrothermal synthesis. These techniques require little sample pretreatment, and during the measurements the dye cannot pene…
Tetrahedral pentaerythritol tetra(3,4-dialkoxybenzoates) and tetra(3,4,5-trialkoxybenzoates) can display columnar liquid-crystalline phases despite the fact that they are neither disc-like nor amphiphilic.
The AC electrical behaviour of sandwich devices fabricated entirely in vacuum using thermally evaporated thin films of lead phthalocyanine and gold electrodes is observed over the frequency range to Hz and the temperature range 160 to 440 K. In the high-frequency region the AC conductivity is proportional to . Capacit…
Throughout the author's research on “Drying Theory”, emphasis has been placed on the observation of phenomena. Regarding the simultaneous transport of mass (water and water vapor)-heat-momentum during drying. it is represented by “drying basic equations” which take the form of simultaneous differential equations, whil…
Partial discharges in high voltage metal-clad switchgear can result in catastrophic failure of the individual plant and in some cases of the substation. There has been a need for detection and location of the damaging discharges without the plant or substation being taken out of service. The conventional partial disch…
The short-range structure in amorphous and liquid GexTe1−x alloys with x≤0.33 has been investigated through time-of-flight neutron diffraction measurements. The first sharp diffraction peak (FSDP) in the structure factor was observed in the amorphous state, implying that the structural units are partially connected ea…
As part of a continuing effort to prepare novel thermally stable high-performance polymers, poly(arylene ether pyrimidine)s have been prepared with 4,6-bis(4-(trimethylsiloxy)phenyl)pyrimidine and a series of activated bis(aryl fluoride)s using a catalytic amount of cesium fluoride in diphenyl sulfone. These polymers…
The High Voltage Electron Microscope (HVEM)/Tandem facility at Argonne National Laboratory has been used to conduct detailed studies of the phase stability and microstructural evolution in zirconium alloys and compounds under ion and electron irradiation. Detailed kinetic studies of the crystalline-to-amorphous transf…
The behavior of molybdenum metal in 0.5 M sulfuric acid treated at various potentials has been studied using core and valence band X-ray photoelectron spectroscopy in a previously described anaerobic cell. Valence band spectra of molybdenum and its oxidized species were interpreted by ab initio band structure calculat…
Abstract Die molaren Volumenanteile des Wasserstoffs in Metallhydriden werden über die Biltzschen Rauminkremente der Metallkationen berechnet. Die außergewöhnliche Polarisierbarkeit des Wasserstoffliganden erklärt seine Anpassungsfähigkeit bei der Ausbildung unterschiedlicher Bindungssysteme in den Metallhydriden. So…
Abstract
Novel calix[4]arene derivatives are synthesized. These are pyrogallol-derived exo-calix[4]arenes with twelve 3-oxaalkanoyloxy chains and exo-calix[4]arenes in which eight or twelve rod-like units (phenylthiadiazole and phenylpyrimidine units) are fixed via spacers with the calix [4] arene central core. The liquid crys…
We consider the configuration properties of a periodic multiblock copolymer made of a regular alternating succession of two monomer species A and B near interfaces betwen two weakly selective solvents \ensuremath{\alpha} and \ensuremath{\beta}. Both solvents are assumed to be good, but their quality is slightly differ…
A combined equilibrium study of tungstovanadates involving potentiometry and 51V, 183W and 17O NMR spectroscopy has been able to identify 11 main species, giving their formation constants and pKa values where relevant. Tentative identification was also made of two other non-equilibrium species at lower pH values, in a…
A theoretical and experimental investigation of the SANS structure factor of labeled triblock HDH copolymer chains, randomly cross-linked into a network, is presented. We combine the RPA method for the consideration of the strong interchain correlations and the tube model with a harmonic deformation dependent constrai…
It is shown that the original Good−Girifalco derivation of an equation for cos θ (where θ is the contact angle of a liquid on a solid) based on intermolecular force (IMF) theory contains an inconsistency which leads to dependence of cos θ on the term −π e /γ L (where π e is the reduction in free energy on equilibraton…
Brass electrodeposits are used for decorative applications and for promotion of adhesion of rubber to steel and other metals. Brass coatings, because of their lubricity, are applied on rods and wires which are further subjected to drawing into thinner gauge. Brass deposits are generally obtained from cyanide electroly…
The partial crystallisation and magnetic behaviour of 43.3Fe 2 O 3 -52.7P 2 O 5 -4.ONa 2 O wt% glass made into frit, fibres and beads have been investigated before and after heat treatment. The Mossbauer spectra indicated that 90% of the iron was present as iron (III) in the glass frit and fibres while the glass beads…
Tin dioxide thin films doped with fluorine were prepared by using a radio‐frequency (RF) magnetron sputtering method. The target was SnO 2 powder mixed with either SnF 2 or SnF 4 powder. The deposition conditions for obtaining films of low resistivity and their physical characteristics were systematically studied. The…
Metal matrix composites based on a sintered M3/2 high speed steel (HSS) and containing either single additions of TiC, NbC, or MnS particles or combined additions of MnS + TiC or MnS + NbC were sintered to full density and subjected to a conventional hardening heat treatment cycle of austenitisation, quenching, and do…