Materials Literature
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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…
Abstract Soils with large quantities of gibbsite are normally associated with tropical climates and very intense weathering. The abundance of this mineral in the clay fractions of soils in the temperate climate of the Blue Ridge Mountains raised questions about the soil environment and possible mineral weathering tren…
In this study, a simple and direct method has been proposed, which can to be used for quantitatively distinguishing the mechanisms of domain reorientation processes in polycrystalline materials. By using this method, the 90° -domain reorientation in the Pb(ZrxTi1-x)O3 ceramic under the electric field was examined thro…
Electronic and magnetic structures of ${\mathrm{Nd}}_{2}$${\mathrm{Fe}}_{14}$B are investigated by performing self-consistent local-density-approximation band-structure calculations and photoemission-spectroscopy (PES) measurements. Employing the linear muffin-tin-orbital band method, we have obtained electronic band…
An unsymmetric diblock copolymer has been suggested to be more effective than a symmetric diblock copolymer for compatibilization of a blend of two homopolymers. It reduces the formation of the micelle which competes with the preferred adsorption of the diblock at the interface of the two homopolymer fields. The homop…
The suitability is considered of employing a Taylor expansion of the kinematic scattering equation for analysing and interpreting diffuse diffraction intensities induced by atomic displacements. The diffuse scattering caused by static atomic displacements in yttria-stabilized cubic zirconium oxide is used as a test of…
A direct method is proposed for the determination of the modulation in incommensurate intergrowth compounds. The method is based on a new type of Sayre equation that relates the phase of a satellite reflection to the sum of structure-factor products of pairs of main reflections. Phases of satellite reflections are thu…
The fine structure of melt-crystallized shish-kebabs is investigated by means of TEM, SAXS, DSC and RS. In addition to the well known two morphological entities (shish and kebab), a third entity called “transitional zone” has been detected by TEM and two independent SAXS maxima. The transitional zone is characterized…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIdentification of isomeric meso-Dioxo derivatives of octaethylporphyrin and separation and structural characterization of the nickel(II) complexesAlan L. Balch, Marilyn M. Olmstead, and Shane L. PhillipsCite this: Inorg. Chem. 1993, 32, 18, 3931–3936Publication Date (Print):…