Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSinglet Electronic Energy Transfer in Polymers Containing Naphthalene and Anthracene ChromophoresD. A. Holden and J. E. GuilletCite this: Macromolecules 1980, 13, 2, 289–295Publication Date (Print):March 1, 1980Publication History Published online1 May 2002Published inissue…
It has recently become possible to observe experimentally the spectral, spatial and temporal evolution of non-equilibrium phonon distributions in solids. The author reviews those techniques which are applicable to high-frequency (>or approximately=200 GHz) phonon propagation. Each technique is analysed for the physica…
The pH difference absorption spectra of human lysozyme [EC 3.2.1.17] were measured. The difference spectra in the acidic region had a peak at 300 nm, as observed for hen and turkey lysozymes. The pH dependence curve of the extinction difference at 300 nm was well interpreted in terms of the pK values of the catalytic…
A Monte Carlo simulation of the Knudsen diffusion of gases in a porous solid is described and results of such simulations presented. The solid was represented in the computer as an assemblage of spheres. Equations are presented which enable the prediction of a Knudsen diffusivity from the mean pore size (or, preferabl…
Glass-ceramics which have played an ever increasing role in science and technology in the last two decades are the most widely used representative of a new type of partly crystalline or semi-amorphous materials. They can be prepared by induced crystallization of glass-forming melts. This article, which is in two parts…
An analysis is presented of the contributions to the potential energy of interaction between water molecules near the hydrogen bonded equilibrium configuration. From this analysis we synthesize an effective potential that includes the influences of long-ranged and nonadditive interactions. The influence of the hydroge…
Electrochemical responses from the reduction of Ru III (edta) coordinated to films of high molecular weight poly(4‐vinylpyridine) on pyrolytic graphite electrodes were studied as functions of film thickness, temperature, supporting electrolyte composition, and solvent. Responses at filmed electrodes from metal complex…
The dependence of the oxidation rate of lead films on the pressure of oxygen was investigated by ellipsometric and resistance techniques for oxygen pressures between 200 Pa and 100 kPa and in the temperature range 323-423 K. Measurements of the pressure dependence were obtained by studying the change in oxidation rate…
SUMMARY Minority carrier lifetime is one of the basic material properties in optoelectronic devices and material. Both the micrometer range dimensions of the devices and lifetime variations around defects in materials require a lifetime measurement technique with both high spatial and high temporal resolution. In orde…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic properties of a (tetraphenylporphyrin)iron(III) thiolate: Fe(TPP)(SC6H5)(HSC6H5)S. W. McCann, F. V. Wells, H. H. Wickman, T. N. Sorrell, and J. P. CollmanCite this: Inorg. Chem. 1980, 19, 3, 621–628Publication Date (Print):March 1, 1980Publication History Published…
Abstract Mischungen von Na 2 SP 4 S 10 und Na 4 Ge 4 S 10 P 4 S 10 wurden thermo‐analytisch durch DTA und DSC untersucht. Im System Na 2 SP 4 S 10 wurden die kongruent schmelzenden Verbindungen Na 3 PS 4 , (NaPS 3 ) x und die sich peritektisch zersetzende Verbindung Na 4 P 2 S 7 nachgewiesen. Die IR‐Schwingungsspek…
Abstract In the absence of chemical interaction between precipitated silica and styrene-butadiene rubber, reticulation of silica particles occurs in the unvulcanized mixture and produces a stiffening effect. This process occurs gradually at room temperature and very rapidly at curing temperatures. The effect can be qu…
A structural model is proposed to account fully for observed x-ray scattering by certain nematic mesophases above their transition to smectic-C phases. In an external magnetic field, the constituent molecules tend to align into nearly periodic parallel chains that give rise to disc-like intensity distributions along t…
The optical principles of the Zeiss OPMI 1, 6-S, and 7 P/H operating microscopes are discussed, along with standard and fiberoptic illumination systems and the range of currently available support systems.
Diffusion couple experiments on the carbon diffusion in austenitic Fe‐Si‐C alloys at temperatures between 950 to 1150°C. Influence of the Si‐content in the range 1 to 6 wtpct Si and of the carbon content on the carbon diffusivity. Discussion of the decrease in diffusivity caused by Si. Method for computer evaluation o…
Abstract Experiments have been carried out to investigate the effect of equibiaxial orientation on the thermal conductivity of a series of natural rubber compounds. The conductivity was measured normal to the direction of stretch. The main effect has been explained quantitatively and an equation obtained which relates…
We have measured the optical absorption characteristics of copper oxide single crystals in the range from 1.1 to 2.0 eV. The crystals were annealed at various oxygen pressures at high temperatures and quenched to room temperature. A major, broad, previously unknown absorption peak was found at 1.6 eV which we relate t…
Abstract When certain substances, notably waxes, are incorporated into rubber during vulcanization, the surface of the vulcanized rubber may subsequently become covered by a film of the substance diffusing out. This phenomenon, known as blooming, depends on the substance being soluble at the vulcanization temperature…
Abstract The responses of a polymer flame to changes of specimen diameter, ignition position, and stability of the burning surface were determined. These extrinsic flame parameters restricted the transport of oxygen from the environment to the burning surface. With increasing restriction the oxygen demand from the env…
Experimental results are presented for impact of two parallel plates of 6061-T6 Aluminum, skewed at an angle of 26.6° from the axis of the projectile. A transverse displacement interferometer (TDI) [1] with a 200 lines/mm grating is used to monitor the transverse motion of the rear surface of the aluminum target plate…