Materials Literature
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A model is presented to explain the formation and morphologies of surfactant-silicate mesostructures. Three processes are identified: multidentate binding of silicate oligomers to the cationic surfactant, preferential silicate polymerization in the interface region, and charge density matching between the surfactant a…
A high area density of field-induced electron emission sites has been observed on broad-area (12 mm in diameter) CVD diamond films deposited on molybdenum substrates. Furthermore, it was found that the density increased with the electric field applied to the surface of the films. These findings indicate that the CVD d…
Surface phonon spectra from Ta/Al Fibonacci multilayers are studied via Brillouin scattering. Determination of the frequency positions of the Rayleigh wave and the intensity dip corresponding to the longitudinal threshold has enabled us to extract two effective elastic constants C 44 and C 11 of the whole structure. T…
Abstract Reaction of tetrakis( p ‐allyloxyphenyl)porphyrin and perfluoroalkanesulfonyl bromides gives tetrakis( p ‐polyfluoroalkoxylphenyl) substituted porphyrins. The yields are over 90%. The synthesis of the metal ion complexes of these F‐containing porphyrins is also reported. Preliminary results on the study of th…
Abstract Since blending or alloying can provide new PVC‐based materials with tailor‐made properties, it would be interesting to review the general methods of studying this topic. This paper deals with the thermodynamics and miscibility testing methods of PVC‐based blends. Although a large amount of literature has been…
A lot of narrow lines on R 2 , R + , N 1 , N - and some other unknown centers have been observed in γ-rayed pure and doped sodium fluoride crystals in the temperature range of 9-77 K. The proper laser irradiation was used for strengthening the zero-phonon lines and the relative explanation was given. The spectral prop…
The final installment of a three-part paper on the subject of polymer additives. Some of the properties these additives bring to polymers are: anti-blocking agents, anti-fogging agents, antistatic agents, coupling and releasing agents, blowing and crosslinking agents, defoaming agents, emulsifiers, and heat stabilizer…
The growth pattern,morphology and ultrastructure of the tubes in Mastogloia cocconeiformis Grunow have been investigated by light and scanning electron microscopy and cytochemical tests, following the original discovery of the tube-dwelling habit of this diatom by John in 1990. Living samples from the subtidal stromat…
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…