Materials Literature
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Abstract Identification and characterization of coupled diffusional and electrochemical kinetics effects was achieved under potentiostatic anodic dissolution conditions. A one‐dimensional artificial pit geometry with sample wire electrodes embedded in an inert support exposed to NaCl solutions was used to study the di…
The following new or updated patterns are submitted by the JCPDS Research Associateship at the National Bureau of Standards. The patterns are a continuation of the series of standard X-ray diffraction powder patterns published previously in the NBS Circular 539, the NBS Monograph 25, and in this journal. The methods o…
There is some interest in the speciation of water in silicate glasses and melts, and the effect of bulk composition on this speciation. We have obtained infrared and Raman spectra for Si02-H20 glasses with low (1200 ppm) and high (6.3 wt%) water contents. The lowwater-content glass shows an asymmetric band in the fund…
Abstract While polymers are widely used for their excellent insulating properties, there is a growing need for thermally conductive polymer compounds. The thermal conductivity of metal particle, mineral particle, and carbon fiber filled compounds are examined at volume concentrations up to the maximum packing fraction…
The need for flame‐retardant finishing of textiles is examined in the context of the hazards of textile flammability, associated legislation and procedures for assessing textile burning behaviour. The functions of flame‐retardant finishes and durable finishes developed specifically for cellulose, wool and man‐made fib…
Abstract A suite of Georgia kaolinites, ranging from well-ordered to very poorly ordered samples, were studied to explore correlations between degree of structural disorder, geological environment, Fe 3+ content, Fe 3+ electron paramagnetic resonance (EPR) spectrum, and infrared (IR) hydroxyl-stretching band frequenci…
Abstract A Raman microprobe has been used to measure the surface‐enhanced Raman spectra of adenine, guanine, cytosine and thymine. Comparison of the SERS spectrum with solution spectra shows that some line positions are not influenced by the adsorption process while others show large shifts. In the SERS spectrum new l…
We Present a mathematical model for the region of dendritic or cellular growth which often forms during the solidification of alloys. The model treats the region of mixed phase (solid and liquid) as a continuum whose properties vary with the local volume fraction of solid. It is assumed that transports of heat and of…
As a result of development of optics during many centuries the concept was formed that a medium can strongly influence on the light propagation, but the light itself cannot have backward influence on the medium. That concept was refuted only with appearing of coherent and high power radiation of lasers, see, e.g., Nob…
Photochemistry and PhotobiologyVolume 43, Issue 6 p. 691-699 Free Access PHTHALOCYANINES AS PHOTOSENSITIZERS IN BIOLOGICAL SYSTEMS AND FOR THE PHOTODYNAMIC THERAPY OF TUMORS John D. Spikes, John D. Spikes Department of Biology University of Utah Salt Lake City UT 84112, USASearch for more papers by this author John D.…
We consider the deformation and burst of small fluid droplets in steady linear, two-dimensional motions of a second immiscible fluid. Experiments using a computer-controlled, four-roll mill to investigate the effect of flow type are described, and the results compared with predictions of several available asymptotic d…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic wave functions in semiconductor clusters: experiment and theoryLouis BrusCite this: J. Phys. Chem. 1986, 90, 12, 2555–2560Publication Date (Print):June 1, 1986Publication History Published online1 May 2002Published inissue 1 June 1986https://pubs.acs.org/doi/10.10…
Abstract The reactions of OH radicals with Colloidal Q‐CdS, Q‐ZnS, and Q‐Cd3P2 (materials of extremely small particle size showing optical size quantization effects) are studied by pulse radiolysis.
By substitution of Mn3+ ions for 0.2 Fe3+ ions per formula unit of dense polycrystalline 5000-G Ni0.65Zn0.35Fe2O4, the hysteresis loop becomes square (remanent magnetization increases by a factor of 2) without deterioration of X-band microwave dielectric properties or significant increase in coercive field. In additio…
Amorphous GeSe2 films with Ag overlayers have been illuminated in situ in a Rutherford backscattering chamber and the evolution of the silver depth profile as a function of illumination time has been studied. The silver distribution in the doped region is found to be steplike as had earlier been seen in the system Ag/…
We have measured the switching current transient i(t) versus time for 75-nm-thick KNO3 nonvolatile memories having address voltages of 6.3 V and switching times 20–30 ns. The currents are minimum (nearly zero) at t=0 and exhibit a symmetric shape about their maxima at 23±2 ns. This is compatible with Fatuzzo’s theory…
Abstract The vinylation of cellulose by acetylene under alkaline conditions was optimized with respect to both DS and DP. Shortening the reaction time reduced the harmful alkaline depolymerization of cellulose during the reaction and gave products with higher DP values. Thus cellulose, activated by KOH, was vinylated…
The authors report a photoluminescence study of the 811 meV no-phonon line structure in platinum-doped silicon. Zeeman and piezospectroscopy measurements show that the centre responsible for the luminescence has C 2v symmetry. The transition is tentatively identified as occurring between internal levels of substitutio…
Abstract The absorption diffusivity of dicumyl peroxide (DICUP) in low density polyethlene pellets that have been annealed and either cooled slowly or quenched has been measured and correlated with the corresponding changes in crystallinity as measured by DSC. Annealing at 125°C resulted in an increased crystallinity…
Abstract A range of hydroxy‐terminated polymyrcenes has been prepared using hydrogen peroxide initiated polymerization of pyroysate grade, β‐myrcene in n ‐butanol solution at 100°C. An oligomeric fraction, containing a large proportion of dimeric material formed via the Diels–Alder reaction, always accompanies the maj…