Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConjugated Porphyrin LaddersHarry L. AndersonCite this: Inorg. Chem. 1994, 33, 5, 972–981Publication Date (Print):March 1, 1994Publication History Published online1 May 2002Published inissue 1 March 1994https://pubs.acs.org/doi/10.1021/ic00083a022https://doi.org/10.1021/ic00…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTemplate-Synthesized Nanoscopic Gold Particles: Optical Spectra and the Effects of Particle Size and ShapeColby A. Foss Jr., Gabor L. Hornyak, Jon A. Stockert, and Charles R. MartinCite this: J. Phys. Chem. 1994, 98, 11, 2963–2971Publication Date (Print):March 1, 1994Publica…
Corrosion protection of metals can be obtained by coating them with polyaniline dispersions, resulting in a signifiecant and reproducible shift of the corrosion potential. Scanning electron micrograph indicate that the passivation is a multistep process, beginning with an etching stage in wh8ch grain boundaries become…
Numerical micromagnetic calculations rigorously describe the correlation between the microstructure and the magnetic properties of nanocrystalline permanent magnets. In isotropic nanocrystalline permanent magnets exchange interactions override the anisotropy of the individual grains. Therefore the spontaneous magnetic…
We have used a first-principles ultra-soft-pseudopotential method in conjunction with an efficient preconditioned conjugate-gradient scheme to investigate the properties of a series of eight cubic perovskite compounds. The materials considered in this study are ${\mathrm{BaTiO}}_{3}$, ${\mathrm{SrTiO}}_{3}$, ${\mathrm…
A computer program, VOIDOO, is described which can be employed in the study of cavities such as they occur in macromolecular structures (in particular, in proteins). The program can be used to detect unknown cavities or to delineate known cavities, either of which may be connected to the outside of the molecule or mol…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTQuantum-Sized PbS, CdS, Ag2S, Sb2S3, and Bi2S3 Particles as Sensitizers for Various Nanoporous Wide-Bandgap SemiconductorsR. VogelR. VogelMore by R. Vogel, P. HoyerP. HoyerMore by P. Hoyer, and H. WellerH. WellerMore by H. WellerCite this: J. Phys. Chem. 1994, 98, 12, 3183–3…
Abstract We report calculations of electron inelastic mean free paths (IMFPs) of 50–2000 eV electrons for a group of 14 organic compounds: 26‐ n ‐paraffin, adenine, β‐carotene, bovine plasma albumin, deoxyribonucleic acid, diphenylhexatriene, guanine, kapton, polyacetylene, poly(butene‐1‐sulfone), polyethylene, polyme…
Abstract The aqueous polymerization of pyrrole with varying FeCl 3 /Py mol ratio produces black insoluble powders. IR characterization reveals the shifting of the NH stretching band to higher frequency with increasing FeCl 3 amount in the feed composition due to lowering of intermolecular H‐bonding. SEM shows a spong…
The structure of the beta form of copper(I) iodide has been investigated. The hexagonal beta -CuI exists as a single phase between 647 K and 655 K and shows marked anisotropy in its thermal expansion within this small temperature range. The high quality of the diffraction data has allowed the corrected structure for b…
The review is devoted to theoretical and experimental problems in the study of liquid crystals by light scattering methods. Nematic, cholesteric, and smectic liquid crystals in the isotropic and ordered phases are considered. The possible types of fluctuations are discussed for each phase. In the isotropic phase, spec…
The spatial variation of the growth rate on mesa-etched GaAs (1̄1̄1̄)B substrates during molecular beam epitaxy of GaAs is measured from the period of the reflection high-energy electron diffraction (RHEED) intensity oscillation using in situ scanning microprobe RHEED. The surface diffusion length of Ga adatoms on the…
Quantitative measurements of oxygen octahedra local rotation angles are reported for the antiferrodistortive type perovskites, ${\mathrm{Na}}_{0.82}$${\mathrm{K}}_{0.18}$${\mathrm{TaO}}_{3}$ and ${\mathrm{NaTaO}}_{3}$. The results were obtained using a detailed analysis of x-ray absorption fine structure spectra. Thes…
A quantum-mechanical calculation of the non-radiative transition rate by multiphonon processes is performed by employing a more direct mathematical approach than those used by previous workers. Based on the trap potential model proposed by Lucovsky and the optical deformation form of electron-phonon interaction, the a…
The composite thin films of Au-V2O5 were prepared by means of an alternating thermal deposition technique. The electrochromic properties of the films were dependent on Au contents and calcination temperature. The composite film containing 26 at. % Au calcined at 400 °C gave clear electrochromism of reddish-violet (cat…
PbS particles of average diameters ranging from 9.9 to 18.0 nm have been synthesized within a polyacrylamide matrix. The percolative chains of these particles exhibit intrinsic semiconducting behavior at temperatures higher than 340 K. The estimated band gap for these particles are found to be much higher than that of…
The photoluminescence emission of porous silicon was regularly measured while immersed in dilute metal ion solutions of Cu, Ag, and Au. The emission spectra show progressive quenching that advances from the blue edge towards the red edge of the emission band, causing a continuous shift in the band center and a narrowi…
Abstract The aqueous solutions of poly(ethylene oxide)–polyacrylic acid, poly(vinyl pyrrolidone)–poly(vinyl alcohol), and poly(ethylene oxide)–poly(vinyl alcohol) blends have been studied by ultrasonic, rheological, and viscometric techniques. Extensive investigation over a wide range of concentrations, temperatures,…
Light-scattering measurements have enabled us to determine that the transition to sonoluminescence is characterized by a bifurcation in the dynamics of a trapped pulsating bubble. These experiments also reveal that in the sonoluminescence (SL) state, changes in bubble radius of only 20% are associated with factors of…
Abstract The tendrils of the egg capsule of the dogfish Scyliorhinus canicula appear to act as damped springs which become entagled with one another, attaching the capsule firmly to the seaweed Halidrys siliquosa. The present paper describes the structure of tendrils and their method of formation in a specialized regi…