Materials Literature
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Direct anodic oxidation of 1,2-methylenedioxybenzene (MDOB), one of the analogues of 3,4-alkylenedioxythiophene and 3,4-alkylenedioxypyrrole, led to the formation of a novel polyacetylene derivative poly(1,2-methylenedioxybenzene) (PMDOB) on a platinum sheet in acetonitrile with good fluorescence properties of emissio…
The grain boundary morphology of a lamella-forming poly(styrene- b -isoprene) (SI) diblock copolymer was investigated by transmission electron microtomography. The twist grain boundary, at which two lamellar nanodomains orthogonally intersect, was successfully observed in three dimensions (3D). A two-dimensional perio…
Silica−titania-based organic−inorganic hybrid materials (OIHMs) containing covalently bonded organic chromophores with photosensitization ability were developed. The presence of the Ti−O−Si linkage in these OIHMs was established by infrared spectroscopy. Photocurrent and photovoltage were generated upon irradiation of…
We report here the synthesis and characterization of stepladder and ladder poly( p -phenylene- alt -anthrylene)s ( SLPPPA and LPPPA respectively) containing 9,10-anthrylene building groups within the main chain. The polyketone ladder polymer precursors are prepared by palladium-catalyzed Suzuki-type cross-coupling. Th…
The hydrogen sorption behavior of novel Pd-doped sepiolite-derived carbon nanofibers (SDCNs) was investigated. Two chemical doping methods of ethanol/toluene reduction and a polyol process were applied to control Pd(0) formation in the SDCNs at different Pd doping levels. Hydrogen storage capacity was observed to vary…
GaAs nanowires have been grown on SiO2 and GaAs by molecular beam epitaxy using manganese as growth catalyst. Transmission electron microscopy shows that the wires have a wurtzite-type lattice and that alpha-Mn particles are found at the free end of the wires. X-ray absorption fine structure measurements reveal the pr…
A tetrathiafulvalene (TTF) derivative 4-pyridyltetrathiafulvalene (Py-TTF) was synthesized. The 1:2 Ni complex 1 of bis(acetylacetonato)nickel(II) coordinated with Py-TTF was prepared. Complex 1 crystallizes in the monoclinic space group P2(1)/c. Two pyridyl N atoms from two different molecules of Py-TTF are coordinat…
Biosynthetic preparation and (19)F NMR experiments on uniformly 3-fluorotyrosine-labeled green fluorescent protein (GFP) are described. The (19)F NMR signals of all 10 fluorotyrosines are resolved in the protein spectrum with signals spread over 10 ppm. Each tyrosine in GFP was mutated in turn to phenylalanine. The sp…
Numerous studies of the ionic conductivities in oxide-doped chalcogenaide glasses have shown the anomalous result that the ionic conductivity actually increases significantly (by more than a factor of 10 in some cases) by the initial addition of an oxide phase to a pure sulfide glass. After this initial sharp increase…
Bi 2 Se 3 nanosheets with thicknesses of 50−100 nm have been successfully synthesized by a simple microwave heating method using selenium powder, Bi(NO 3 ) 3 ·5H 2 O, HNO 3 aqueous solution, ethylenediamine or ethylene glycol, and an ionic liquid 1- n -butyl-3-methylimidazolium tetrafluoroborate. The effects of experi…
A series of nonlinear optical chromophores based on configurationally locked polyene are synthesized, and the single crystal growth from the melt are investigated. The chromophores consist of a π-conjugated hexatriene bridge between the dialkylamino or methoxy electron donors and the dicyanomethylidene electron accept…
The solubilities of tetracycline hydrochloride, moxifloxacin hydrochloride, and ciprofloxacin hydrochloride were measured in several solvents, such as water, ethanol, 2-propanol, and acetone, in the temperature range of 293.15−323.15 K for ciprofloxacin.HCl and moxifloxacin.HCl and 288.15−310.15 K for tetracycline. Al…
The effect of progressive extension on the structure of human skin has been studied by scanning electron microscopy. Varying degrees of strain were imposed on abdominal skin specimens by a carefully controlled mechanical testing technique. Progressive straining has a two‐stage effect on the epidermis: initial extensio…
Reactions of laser-ablated Mn, Fe, Co, and Ni atoms with H(2)O(2) and with H(2) + O(2) mixtures in excess argon give new absorptions in the O-H and M-O stretching regions, which are assigned to metal dihydroxide and trihydroxide molecules, M(OH)(2) and M(OH)(3). Isotopic substitutions (D(2)O(2), (18)O(2), (16,18)O(2),…
Phenanthrene was adsorbed from ethanol solution to the surface of single wall carbon nanotubes, which were previously physically and chemically characterized. Different anionic surfactants were added in the solutions to enhance the phenanthrene solubility and apparently have also improved the dispersion of two respect…
Thermal breakdown and oxidation of JP-10 ( exo -tetrahydrodicyclopentadiene, C 10 H 16 ), in the presence of nanoparticulate CeO 2 and Fe 2 O 3, was studied in a small alumina flow-tube reactor on time scales around 1 ms. Decomposition products were analyzed by an in situ mass spectrometer. In the absence of any oxidi…
Abstract Perylene dyes are key chromophores in dyestuff chemistry. The solubility, absorption, and emission behavior of this class of materials can be efficiently controlled by functionalization using a variety of different synthetic procedures. Moreover, these chemical modifications have allowed their widespread appl…
An understanding of the interaction between ceria and environmentally sensitive molecules is vital for developing its role in catalysis. We present the structure and energetics of CO adsorbed onto stoichiometric (111), (110), and (100) surfaces of ceria from first principles density functional theory corrected for on-…
Crack patterns in a layer of laponite gel allowed to dry in a static electric field are studied. Crack patterns in natural and synthetic clays have been studied extensively with interesting results. This is the first report of such an observation in a radial electric field. The nano-sized disc-like laponite particles…
A MOKE magnetometry unit simultaneously sensitive to both in-plane magnetization components, based on an intensity differential detection method, allows us to observe the uniaxial anisotropy impressed during CoFe-deposition and to discriminate the magnetization processes under a magnetic field parallel and perpendicul…