Materials Literature
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The pyrolysis of organic compounds were carried out and the magnetic properties of the obtained carbons were investigated. Polymer-derived carbons, perfomed as a preliminary study, still seen to be of paramagnetic nature, although the carbons shoned hysteresis even at room temperature. Next, the pyrolysis of organic m…
It is well known that dipole-dipole forces (induced by external electric fields) between colloidal particles play a central role in determining the thermodynamic phases of electrorheological fluids. Here, it is argued that the long-range van der Waals forces induced by photon exchange also play an important role. A th…
The authors conducted differential scanning calorimeter (DSC) measurements of various crosslinked polyethylenes of known thermal history, and found close relationships between the DSC profiles and the thermal history. From the detailed investigation of these relationships the temperature and the period of heat treatme…
A study of photoelectrochemical etching of AlGaAs / GaAs multilayers under conditions of constant potential or constant current is presented. It is shown that the etch rate changes as the process proceeds vertically through the layered sample. In addition, when the etching front crosses the interface between two epila…
Abstract The problem of elastic and inelastic scattering of Auger electrons, photoelectrons and backscattered electrons is investigated. The path length distribution functions for emitted and backscattered electrons are calculated analytically in different approximations for elastic scattering. The calculations are ca…
Crystal data and results of structure refinements for ScPO 4 are reported. The material is tetragonal, I4 1 /amd, with a = 6.5787(2) Å, c = 5.7963(2) Å, V d = 250.86(2) Å 3 , Z = 4, D x = 3.704 Mg/m 3 . Intensity data were obtained from a Stoe transmission type diffractometer equipped with a position sensitive detecto…
Crystallographic description of the elastically matched polydomain regions and of the possible transition regions (states) has been used for search of some rules for formation and rearrangement of the domain structure in Pb2CoWO6 single crystals. The role of the internal mechanical stresses and their relation with res…
An extensive analytic analysis of tilted lamellar growth is presented. We first confine ourselves to a situation where both solid phases are identical and the concentration is maintained at the eutectic composition far ahead of the solidification front. A Rapid Communication has already been devoted to this case [C. M…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExcited-state photophysics of donor-appended cobalt(II) porphyrins from picosecond transient absorption spectroscopyGlen R. Loppnow, Dan Melamed, A. Rachel Leheny, Andrew D. Hamilton, and Thomas G. SpiroCite this: J. Phys. Chem. 1993, 97, 35, 8969–8975Publication Date (Print…
Predictions of macroscopic and microscopic thermodynamic properties of a polymer blend using the Born–Green–Yvon (BGY) integral equation treatment of a compressible polymer mixture on a lattice are compared to recent simulations of compressible symmetric binary mixtures on a lattice. The theory is consistent with rece…
The reaction cross sections of 27Al(n, p)27Mg, 27Al(n, a)24Na, 56Fe(n, p)56Mn, 90Zr(n, 2n)89m+gZr and 93Nb(n, 2n)92mNb have been measured by the activation method in an energy range of 13.3–14.9 MeV using the intense D-T neutron source, FNS. Absolute flux was determined by the associated α-particle counting method inc…
Hydrogen and oxygen gases radiolyticaily generated in a nitrate system by α-radiation were investigated. The following points were elucidated: (1) Plutonium (IV) is involved in the G-value for hydrogen generation. The difference in G-values in 244Cm-HNO3 solution and Pu(IV)-HNO3, solution can be explained by the prese…
This paper is the first in a series of four which investigates the burning behaviour and the influence of flame retardant species on the flam mability of fibre-forming polymer and copolymers of acrylonitrile. A pressed powdered polymer sheet technique is described that enables a range of polymer compositions in the pr…
The structure of {1101} twins in Ti films evaporated on NaCl substrates held at 250°;C has been examined by high-resolution electron microscopy. The analysis, using computer simulation, showed that it is necessary to derive a new model for the twin boundary in order to match the experimental images. The atomic structu…
Magnetic Barkhausen noise ( MBN) measurements were made on a sample of pipeline steel to study the effect of magnetic flux density on the tensile stress dependence of MBN. The results suggest that MBN activity generally increases with flux density but begins to decrease slightly at higher flux densities. Similar behav…
Abstract Peroxides are preferred for heat curing vinylmethylsilicone (VMQ) elastomers because the free-radical-initiated crosslink does not reduce the inherent stability of the polymer. The objectives of this work were (1) to obtain information on the relationship between peroxide concentration and the physical proper…
Abstract The kinetics of hydrogen absorption and desorption in LaNi 4.8 Al 0.2 ,LaNi 4.9 Al 0.1 and LaNi 5 , suspended in cyclohexane and LaNi 5 in ethanol have been investigated. The absorption process can be described in terms of mass transfer and reaction resistances in series. The rate‐limiting steps for this proc…
A review is given on some progress made in structural investigation of both synthetic and natural polymers with a view to their degradation. Some new results are presented which stress the importance of the socalled amorphous portion of polymers and its orientation for processing, properties, and degradation. The stru…
Abstract A method of infrared (IR) analysis for quantitative determination of tubular halloysite in mixtures with kaolinite was investigated for drill hole samples collected during an assessment of paper-coating kaolin resources at the Mount Hope Kaolin Deposit, Eyre Peninsula, South Australia. Tubular, dehydrated hal…
Experimental evidence of cooperative behavior during the ferroelectric phase transitions in granular and powder KNO3 at atmospheric pressure is presented. Three different experimental studies were performed in which phase transitions were detected and characterized by heat flow calorimetry: (1) the distribution of SiC…