Materials Literature
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The dynamics of a surface-confined drop in a simple shear field has been studied, pursuing the dissipative particle dynamics (DPD) simulation approach. The shear field induces contact angle hysteresis in the drop, the degree of hysteresis increasing with the shear rate. At shear rates exceeding a critical value, the d…
Carbon nano-filament formation in hydrocarbon and syngas based catalytic processes is fatal for supported metal catalysts as this leads to deactivation and crushing, and hence limitation of carbon deposition has been a major topic in catalysis.1–5 Recently, the deliberate preparation of catalytically grown nanocarbons…
Photoexcitation of a Zn–tetraphenyl porphyrin–fullerene complex leads to electron-transfer with very long lifetimes of the charge-separated pairs.
We consider radial hedgehog equilibrium configurations of the tensor order parameter in spherical droplets of nematic liquid crystals modeled by free energies of the Landau--de Gennes type. We show that such configurations must become unstable at sufficiently low temperatures in droplets of sufficiently large radii fo…
Recent advances in sol-gel processing, with the aim of porous ceramic oxide preparation and applications in catalysis and membrane separation, are reviewed. Recent results from our group in porous solid preparation are presented. Three topics of particular interest are reported which highlight the potential of sol-gel…
Nanoscopic polyaniline particles were successfully synthesized in a stable water–oil microemulsion. FT-IR spectra showed that sodium dodecylbenzenesulfonate (SDBA) acted both as surfactant and dopant in the acidic reaction media. Wide-angle X-ray diffraction, UV–visible spectra and thermal analysis suggested that the…
The vertical ionization potentials (IP's) of a variety of free-base and zinc porphyrins and free-base and zinc phthalocyanine, including all those for which experimental ultraviolet photoelectron spectral (UPS) data are presently known, are computed using six semiempirical molecular orbital methods. Koopman's Theorem…
Poncirin was isolated from water extract of the fruits of Poncirus trifoliata and metabolized by human intestinal bacteria. The inhibitory effect of poncirin and its metabolites by these bacteria on the growth of Helicobacter pylori (HP) was investigated. Among them, ponciretin (5,7-dihydroxy-4'-methoxyflavanone), the…
Recombination coefficients (γ) of Br and F atoms have been measured for crystalline Si, quartz, photoresist, anodized aluminum, poly-Si, WSix, tungsten and stainless steel surfaces for a range of temperatures. The γBr and γF values are compared to our previously reported measurements of γCl [G. P. Kota, J. W. Coburn,…
This issue of “FORMA ” presents an English translation of Haeckel’s book “Crystal Souls”, with Alan Mackay’s introduction and detailed annotations. The tanslation was accomplished by Alan, my respectable old friend since 1950’s. When this book published in 1917, Haeckel tried to attract people to beautifully organized…
The reaction of cerium metal in 2-methoxyethanol at 200–250 °C yielded a transparent colloidal solution of ultrafine (2 nm size) ceria particles.
Vanadium oxide films have been deposited by atomic layer epitaxy (ALE) at temperatures ranging from 50 to from vanadyl triisopropoxide and water precursors. The growth mechanism was studied in situ by quartz crystal microgravimetry allowing us to distinguish different growth regimes. ALE growth extends from near room…
In order to investigate the effects of alumina and metal ions in plasma discharge, plasma reactors packed with a mixture of BaTiO/sub 3/ pellets and porous Al/sub 2/O/sub 3/ pellets (alumina-hybrid reactor), and with a-mixture of BaTiO/sub 3/ pellets and metal-supported Al/sub 2/O/sub 3/ pellets (catalyst-hybrid react…
meso-Tetraarylporphyrins participate, as dipolarophiles, in 1,3-dipolar cycloaddition reactions with azomethine ylides to yield novel chlorins and isobacteriochlorins.
The molecular weight distribution (MWD) is derived for polymers generated by self-condensing vinyl polymerization (SCVP) of a monomer having a vinyl and an initiator group (“inimer”) in the presence of a multifunctional initiator. If the monomer is added slowly to the initiator solution (semi-batch process), this lead…
Iron deficient compositions of (Ni/sub 0.2/Cu/sub 0.2/Zn/sub 0.6/)/sub 1.02x/Co/sub x/Fe/sub 1.98/O/sub 4/ (0/spl les/x/spl les/0.05) were prepared to investigate their initial permeability dependence on cobalt contents. Extrinsic factors such as grain size and sintered density change little in samples sintered at 900…
The electronic coupling between the phenyl substituents of mono-, bis-, and tris(tricyanovinyl)-substituted triphenylamines (1, 2, 2-OMe and 3) have been investigated by various methods: the splitting of excited states was taken as a measure of the interaction. These splittings can be seen in the optical absorption sp…
The electronic and geometric effects induced by hydrogen chemisorption on small platinum particles supported on high surface-area saponite clay and zeolite LTL were studied by near edge X-ray absorption fine structure (XAFS) spectroscopy. A new subtraction procedure was developed to separate the electronic from geomet…
In order to consider a phase selection in a ternary eutectic system, analytical expressions for three-phase planar eutectic growth have been derived, assuming the geometries as regular, rod+hexagon and semi-regular types. Irrespective of geometries the relations that the undercooling is proportional to the square root…
The crystallizability of narrow composition, homogeneous ethylene/1-octene copolymers made with a constrained geometry catalyst, measured by CRYSTAF, follows a straight line correlation with the amount of total comonomer incorporated. The potential use of these resins as standards to calibrate CRYSTAF and TREF techniq…