Materials Literature
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Growth of Escherichia coli K-12 in a modified Davis minimal medium was inhibited under high osmolarity, but it recovered remarkably with the addition of 1 mM proline. The co-existence of K+ with proline enhanced the recovery of growth under high osmolarity more than that in the presence of proline alone. The same was…
Catalytic oxidation of N,N'-dimethylthiourea and thiourea by dioxygen in water using a new cobalt(II) complex of octasulfophenyltetrapyrazinoporphyrazine was performed under mild conditions. The reaction is shown to include the formation of an intermediate anionic five-coordinate complex followed by an unusual two-ele…
The treatment of stainless steel surfaces with responsive polymers was investigated using X-ray photoelectron spectroscopy and scanning electron microscopy. Poly(N-isopropylacrylamide) (PNIPAAM) is a temperature-sensitive polymer which is soluble in water below 32°C (Lower Critical Solubility Temperature (LCST)) but c…
We have demonstrated the direct formation of prolate Ag nanoparticles with a quasi parallel major axis on a template layer of SiO 2 having a strongly anisotropic surface morphology. The peculiar nanomorphology of the nanoparticles and template is physically self-organized owing to self-shadowing during oblique vacuum…
Chains of crystalline-Si nanospheres (Si nanochains), in which Si nanocrystallites are connected by amorphous Si oxide periodically in nearly equal spacing forming a chain-like one-dimensional structure, have been fabricated via a self-organized formation process. In this paper, we review our recent studies and extend…
The adherence and activation of primary human monocytes was investigated on a polyelectrolyte multilayer film containing hyaluronic acid (HA) and poly-L-lysine (PLL). The sequential layer-by-layer deposition of the multilayer film was characterized by surface plasmon resonance. Eight alternating bilayers displayed an…
Induced by systematic variation of the initial polymer concentration in toluene, various morphologies of aggregates including vesicles, spheres, onion-like structures, and worm-like fibers from a rod-coil-rod triblock copolymer, oligo(p-phenyleneethynylene)-polystyrene-oligo(p-phenyleneethynylene), were observed by tr…
High aspect ratio diamond nanocone arrays are formed on freestanding diamond film by means of focused ion beam (FIB) milling technology and hot-filament chemical vapor deposition (HFCVD) method. The structure and phase purity of an individual diamond nanocone are characterized by scanning electron microscopy (SEM) and…
Time-resolved spectra of the luminescence in oxygen-deficient α-Al2O3 crystals were studied using synchrotron radiation. The UV luminescence with hν = 3.26 eV and τ = 1.6 ns was detected in addition to the known slowly relaxing component (hν = 3 eV, τ = 34 ms) of the emission transition of the F-center under excitatio…
Nanostructured hydrous ruthenium-tin oxides [denoted as ( Ru Sn ) O x ⋅ n H 2 O ] with variable Sn contents were fabricated by a modified sol-gel process. The mean particle size of pristine ( Ru Sn ) O x ⋅ n H 2 O , smaller than 3 nm, was monotonously decreased with increasing the mole fraction of Sn in precursor…
The year 2004 has seen many advances in supramolecular chemistry, and the most significant are reviewed here. The inherent multi-disciplinary nature of supramolecular chemistry continues to provide new challenges in new areas to the supramolecular chemist in both materials science and at the life science interface.
Density functional theory (DFT) at the hybrid B3LYP level has been applied to the germanium clusters Ge8z(z=-6, -4, -2, 0, +2, +4) using nine initial geometries. For Ge8(2-) the D2d bisdisphenoid structure predicted by the Wade-Mingos rules is not computed to be the global minimum but instead lies 3.9 kcal mol-1 above…
Infrared attenuated total reflection spectroscopy has been used to observe the surface chemistry of Si 3 N 4 films (grown on Si by low-pressure chemical vapor deposition) under steady-state conditions during exposure to dilute aqueous HF solutions. Surfaces etched in HF do not exhibit rapid growth of an SiO 2 layer wh…
We derive a general theory for imaging by a flat lens without optical axis. We show that the condition for imaging requires a material having elliptic dispersion relations with negative group refraction. This medium is characterized by two intrinsic parameters sigma and kappa. Imaging can be achieved with both negativ…
A family of hybrid organic–inorganic network materials—the star gels and glasses—has been synthesized from highly functional poly(alkoxysilane) molecular precursors. The starting silanes comprise an atomic, linear or cyclic core with multiple flexible arms which terminate in network-forming trialkoxysilane groups. Wit…
New macrocycles incorporating a porphyrin and a [small pi] electron-rich aromatic were prepared from a dynamic disulfide library. The outcome could be influenced by use of templates.
A mononuclear cobalt(II) complex CoL5, containing the pentadentate O2N3 salen-type Schiff-base ligand H2L5=N,N[prime or minute]-bis(3-tert-butyl-2-hydroxy-5-methylbenzylidenyl)-1,7-diamino-4-methyl-4-azaheptane, exhibits magnetic ordering at 4 K as proven by ac magnetic susceptibility (both in- and out-of-phase), magn…
Y2O3:Eu red phosphor powder was synthesized with powders of metal–ethylenediaminetetraacetic acid (EDTA) complexes as a starting material. The compositional analysis of each metal–EDTA complexes particle and Y2O3:Eu particle was performed using a particle analyzer. In this study, first, the particles of a mixture of Y…
The redox behaviour of Pd-based TWCs is studied under dynamic, cycling conditions (e.g. lambda oscillations) on a 50 millisecond scale. Pd temporal response to gas inlet mixture changes is governed by metal-promoter interface properties.
Abstract The relationship between morphology and deformation behavior of selected ethylene/1‐octene copolymers (EOCs) and their blends with high density polyethylene (HDPE) was investigated. The copolymers showed, depending on the 1‐octene content, different morphologies ranging from lamellar to worm‐like crystalline…