Materials Literature
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Metallophthalocyanine complexes and related compounds play an important role in many advanced applications and modern technologies mostly by virtue of their characteristic optical absorption and high chemical stability. As a class of materials made well-known by their vivid and fast colors, it is expected that metallo…
I will discuss unique electronic and structural mechanisms of Ovonic optical phase-change devices making possible orders of magnitude increase of density of memory and introducing multiple information functions in a single nanostructure spot.
Fracture toughness and fracture strength data are presented for the first time for monoclinic zirconia. An undoped nanocrystalline zirconia powder was sintered at 1100°C and yielded a theoretical density of more than 90% with a grain size of about 150 nm. The surface crack in flexure (SCF) technique was deemed most su…
The radiation force-per-length on an infinitely long circular cylinder in an acoustic plane standing wave is expressed in terms of partial-wave scattering coefficients for the corresponding traveling wave scattering problem. This information allows a dimensionless radiation force function to be expressed using coeffic…
Molecular replacement (MR) is the method of choice for X-ray crystallography structure determination when structural homologues are available in the Protein Data Bank (PDB). Although the success rate of MR decreases sharply when the sequence similarity between template and target proteins drops below 35% identical res…
A water-insoluble anti-cancer agent, camptothecin (CPT) was incorporated to a polymeric micelle carrier system forming from poly(ethylene glycol)-poly(aspartate) block copolymers. Incorporation efficiency and stability were analyzed in correlation with chemical structures of the inner core-forming hydrophobic blocks a…
Phase diagram studies of the system SrO‐Fe 3 O 4 ‐MoO 3 were undertaken in Ar/1% H 2 at 1200°C with particular emphasis on the region near Sr 2 FeMoO 6 (SFMO). We find that Sr 2 FeMoO 6 is not a point compound but is part of the Sr 2+ z Fe 2− x Mo x O y solid solution region. The oxygen stoichiometry, y , in Sr 2 Fe 2…
Magnetic tunnel junctions with a stacking structure of Cr/Co-Mn-Al/Al-O/Co-Fe/Ir-Mn were fabricated using a UHV magnetron-sputtering machine. Co-Mn-Al films showed B2 structure, which involves partial disorder between Mn and Al sites. Tunnel magnetoresistance ratios at room temperature were 27% and 40% before and afte…
The preparation of low resistivity polycrystalline Al-doped ZnO (AZO) thin films on glass substrates by a pulsed laser deposition method is described, including a description of conditions necessary to obtain low resistivity on the order of 1×10−4 Ω cm. The resistivity of transparent conducting AZO films obtained was…
Utilizing polypeptide secondary structure as a means for controlling oxide pore architectures is explored. Poly-L-lysine is used as a model polypeptide as its folding behavior is well understood and compatible with the sol-gel chemistry of silica. Here, we show that silicas synthesized with poly-L-lysine in a alpha-he…
A combined experimental and first principles study of the $(2\ifmmode\times\else\texttimes\fi{}1)$-reconstructed rutile ${\mathrm{T}\mathrm{i}\mathrm{O}}_{2}(011)$ surface is presented. Our results provide evidence that the surface structure is described by a model that includes onefold coordinated (titanyl) oxygen at…
We analyze the behavior of supercooled fluids under shear both theoretically and numerically. Theoretically, we generalize the mode-coupling theory of supercooled fluids to systems under stationary shear flow. Our starting point is the set of generalized fluctuating hydrodynamic equations with a convection term. A non…
Magnetostrictive Terfenol-D (Tb/sub x/Dy/sub 1-x/Fe/sub 2/) and piezoelectric (Pb(Zr/sub 1-x/Ti/sub x/)O/sub 3/) magnetoelectric (ME) laminate composites have been investigated experimentally for various modes of operation: longitudinal magnetized/longitudinal polarized (L-L mode), transverse magnetized/longitudinal p…
Abstract The preparation of nanoclay‐reinforced polypropylene nanocom posites by means of melt processing was investigated. In order to optimize the dispersion of the nanoclay and the nanoclay‐matrix interface, experiments were performed with three different nanoclays, two different maleic‐anhydride–grafted PP couplin…
Precipitation morphology and habit planes of the δ-phase Zr hydrides, which were precipitated within the a-phase matrix grains and along the grain boundaries of recrystallized Zircaloy-2 cladding tube, have been examined by electron backscatter diffraction (EBSD). Radially-oriented hydrides, induced by residual tensil…
Cerium‐doped α‐SiAlON (M x Si 12−( m + n ) Al m + n O n N 16– n ) materials have been prepared by gas‐pressure sintering and post‐hot‐isostatic‐press (HIP) annealing, using four powder mixtures of α‐Si 3 N 4 , AlN, and either (i) CeO 2 , (ii) CeO 2 + Y‐α‐SiAlON seed, (iii) CeO 2 + Y 2 O 3 , or (iv) CeO 2 + CaO. Cerium…
Abstract The use of well‐defined macromolecular assemblies with tunable interactions represents the key for exploring the regime of soft‐material behavior between hard spheres and polymer coils. Colloidal stars are ideal choices for such a formidable task and especially for shedding light on the formation and properti…
We studied the silicic acid uptake kinetics of the pennate diatom Cylindrotheca fusiformis grown under a wide range of iron concentrations (from Fe‐limiting to Fe‐sufficient conditions) to assess the effect of iron availability on diatom cell size, silicon content, and silicic acid uptake kinetic parameters. As the ir…
Preliminary results of Raman scattering measurements of multiwall carbon nanotubes (MWCNT) are presented. The nanotubes have been carefully dissolved, separated and then characterized by AFM. The micro-Raman spectra are taken with 514,5nm wavelength excitations in the range 4K - 400K. Basically the spectra are quite s…
We report here the crystallographic and biophysical analysis of a soluble, catalytically active fragment of the Escherichia coli type I signal peptidase (SPase Delta2-75) in complex with arylomycin A2. The 2.5-A resolution structure revealed that the inhibitor is positioned with its COOH-terminal carboxylate oxygen (O…