Materials Literature
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Abstract The nature and extent of hydrazine adsorption by clays and soils was found to be highly dependent on the suspension pH and on the types of surface functional groups. Under acidic conditions, replacement of Na + by N 2 H + 5 was the primary mechanism for hydrazine retention by every system studied. Most of the…
Cu- and Zn-containing compounds are characterised making use of the Wagner Auger parameter and of the so-called chemical state plots to obtain information on the relative initial-state charge distributions and on the relative extra-atomic relaxation energy. The position in the plots of different classes of compounds i…
Cotton yarn (40 Ne) was sized at squeeze pressures of 22 and 33.8 daN/cm 2 (cor responding to 5 and 25 daN/cm) on a laboratory sizing machine. The weaving per formance of yam sized at the high pressure was better than the yarn sized at the low pressure. This improvement is attributed to increased size penetration, gre…
The special features of synchrotron X-radiation and the types of instrumentation required for a range of synchrotron X-ray diffraction experiments are outlined. A diverse range of applications to inorganic and heterogeneous catalyst systems are discussed. Grazing incidence X-ray diffraction experiments have revealed a…
Clay complexes with surface‐grown nickel(II) basic salts were produced from nickel(II) nitrate solutions containing dispersed layer silicate by homogeneous precipitation using hydrolysis of urea. These clay—nickel(II) salt complexes were obtained with clay having cation‐exchange properties; in contrast, using clay wit…
The ratio d${\ensuremath{\sigma}}_{K}$(\ensuremath{\theta})/d${\ensuremath{\sigma}}_{\mathrm{free}(\mathrm{\ensuremath{\theta}}}$) of the differential cross sections for Compton scattering by K-shell electrons of lead to Compton scattering by free electrons has been measured for an incident photon energy of 662 keV an…
A new type of cation-compensated ${\mathrm{Fe}}^{3+}$ (S=(5/2) center designated [${\mathrm{FeO}}_{4}$/M${]}_{\mathrm{\ensuremath{\beta}}}^{0}$, with M=Li and H, has been found to exist in synthetic iron-doped \ensuremath{\alpha}-quartz, through an X-band electron paramagnetic resonance study. The spin-Hamiltonian par…
Abstract This paper focuses on the problem of scale‐up of two‐phase (e.g., solid‐fluid) reactors. It outlines a class of such reactors which, for first‐order reactions, scale in the familiar single‐phase manner via an analog of the usual residence time distribution formula. The differences lie in the fact that the app…
The dielectric relaxation time τ of KH2PO4 and CsH2AsO4 was investigated in the ferroelectric phase through measurements of the complex dielectric constants in the frequency range between 103 Hz and 109 Hz. Anomalous increase in τ near the domain freezing temperature Tf , considered together with the relation between…
It has been proved that on approaching the line of (first-order or second order) transition between ordered phases a symmetry breaking necessarily occurs within a domain wall. The symmetry breaking in the cases under investigation takes place as a second-order phase transition. Calculations were performed for a reorde…
Structural investigations concerning colour centres in MoO3 are described. The structure of MoO3 is studied by electron diffraction and by X-ray diffraction (powder technique). The films are coloured thermally, optically (UV), and electrically. During the crystallization process, the dangling bonds tend to connect the…
Abstract Medical grade black braided silk suture and pure mulberry silk twisted yarn were grafted with methacrylic acid (MAA) using 60 Co gamma radiation. The effect of various synthesis conditions on the grafting was studied. The addition of methanol in water has a marked effect on the degree of grafting, maximum yie…
The elastic moduli of the entire vitreous range of the system ZnO–P2O5 that can be prepared by melting ZnO and P2O5 oxides in open crucibles have been measured by ultrasonic techniques. The bulk, shear, longitudinal, and Young’s moduli, and the Poisson’s ratio are found to be rather sensitive to the glass composition.…
We optimized the losses in iron-rich metallic glasses by surface crystallization and by annealing in a field perpendicular to the ribbon surface. Both methods lead to a weak perpendicular anisotropy and rotational magnetization processes. The origin of surface crystallization could be traced to the effects of oxygen d…
Two models have been proposed to explain the mechanical strength increase of abraded or indented soda–lime glasses upon aging, namely, crack tip blunting and the release of residual tensile stress near the crack tip. To clarify the mechanism, the time dependence of the strengthening of an abraded soda–lime glass was i…
An experimental procedure for the determination of temperature de pendence of thermal conductivity of foam insulations blown with condensable gases is presented. The procedure is used to investigate the effect of the blowing agent on thermal conductivity of a polyurethane system blown with CFC-11 or HCFC-123, at vario…
Abstract The spin‐lattice relaxation time T 1 and the NMR second moment M 2 of 1 H and 19 F nuclei were determined at various temperatures above 77 K for (NH 4 ) 3 [InF 6 ] and (NH 4 ) 3 [GaF 6 ] crystals. From the fact that small M 2 values observed for both nuclei from fairly low temperatures, it is concluded that t…
The composition of n- and p-type CdTe surfaces before and after chemical modification by Ru have been examined using X-ray photoelectron spectroscopy (XPS). While the chemically etched unmodified surfaces were found to be covered by a thin layer of oxide due to ambient oxidation of a Te layer, Ru-modified surfaces wer…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation, characterization, and low-temperature transition of (triazatetrabenzoporphyrinato)copper(I) iodide, a new porphyrinic conductor with local moments coupled to itinerant charge carriersKwangkyoung Liou, Michael Y. Ogawa, Timothy P. Newcomb, Guy Quirion, Moohee Lee…
Adequate adhesion between metals and polymers is primarily the result of chemical bonds in the boundary layer. This region, however, is subject to degradation by moisture. Three modes of deterioration are observed. The first is a largely reversible weakening effect in the polymer layer near the metal oxide surface. Th…