Materials Literature
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Highly luminescent thiol-capped CdTe and HgTe nanocrystals synthesized in aqueous solutions were subject to a partial exchange of capping ligands with 1-dodecanethiol and transferred into different nonpolar organic solvents. It was found that acetone plays an important role in an efficient phase transfer of the nanocr…
Nanoparticles of CdTe were found to spontaneously reorganize into crystalline nanowires upon controlled removal of the protective shell of organic stabilizer. The intermediate step in the nanowire formation was found to be pearl-necklace aggregates. Strong dipole-dipole interaction is believed to be the driving force…
Abstract We prepared triphenylamine (TPA)‐containing polymers by a direct oxidative‐coupling method, which showed high thermostability, good solubility, high quantum efficiency, and blue light emission. The polymers are characterized by Fourier transform infrared spectroscopy, 1 H‐NMR, ultraviolet–visible spectroscopy…
A commercial block copolymer poly(ethylene oxide)−poly(propylene oxide)−poly(ethylene oxide) (PEO−PPO−PEO) sold under the trade name of Pluronic F108 was adsorbed on polystyrene (PS) latex particles. The adsorption isotherm of the copolymer on the PS latex particles was measured using an indirect method (colorimetric…
Traditionally, the corrosion behaviour of container materials can be predicted by extrapolation from relatively short-term experiments. Approaches to life prediction are described for two kinds of materials: carbon steel (corrosion allowance material) which must resist general corrosion, and passive materials (corrosi…
13 C NMR progressive saturation measurements were used to investigate longitudinal relaxation in the crystal phase of semicrystalline alkanes. Novel monodisperse, ultralong n -alkanes were melt crystallized in such a way that they comprised crystals containing extended chains or once-folded chains. The crystalline mor…
This letter reports the self-assembly and analysis of CdSe nanocrystal monolayers on both p - and n -doped GaAs substrates. The self-assembly was performed using a 1,6-hexanedithiol self-assembled monolayer (SAM) to link CdSe nanocrystals to GaAs substrates. Attenuated total reflection Fourier transform infrared spect…
It is well known that in addition to the longitudinal modulus, viscoelastic liquids show a shear stiffness at sufficiently high probe frequencies due to structural relaxations. For probe frequencies that are large compared to the structural relaxation frequency, the measured elastic longitudinal and shear moduli becom…
Novel composite nanotubes, consisting of NbS 2 -sheathed carbon nanotubes (CNTs), have been generated successfully employing carbon nanotube template-promoted growth. Detailed experimental procedures, and the associated intermediate oxide phases during NbS 2 conversion, have been evaluated using high-resolution transm…
The one-electron oxidized linear pentanuclear nickel complexes [Ni(5)(tpda)(4)(H(2)O)(BF(4))](BF(4))(2) (1) and [Ni(5)(tpda)(4)(SO(3)CF(3))(2)](SO(3)CF(3)) (2) have been synthesized by reacting the neutral compound [Ni(5)(tpda)(4)Cl(2)] with the corresponding silver salts. These compounds have been characterized by va…
A layered vanadium phosphate [V4O7(HPO4)2(2,2′-bipy)2] was synthesized and characterized (elemental analysis, IR and thermal analysis) by the hydrothermal reaction of NaVO3·2H2O, ZnO, H3PO4, 2,2′-bipy and water. The compound [V4O7(HPO4)2(2,2′-bipy)2] exhibits a unique 4,6,8-net structure with organonitrogen donors of…
Abstract Acoustic properties of nitrile butadiene rubber (NBR) specimens with carbon black as filler were investigated with different sulfur contents in the frequency range of 300‐1000 kHz. Their mechanical properties, such as density, hardness, tensile strength, were conventionally measured and correlated with their…
The photochemical and subsequent thermal reactions of the mouse short-wavelength visual pigment (MUV) were studied by using cryogenic UV-visible and FTIR difference spectroscopy. Upon illumination at 75 K, MUV forms a batho intermediate (lambda(max) approximately 380 nm). The batho intermediate thermally decays to the…
Abstract Polyaluminocarbosilane (PACS) as the precursor of high‐temperature resistant SiC fibers was synthesized by reacting polycarbosilane (PCS) with aluminum(III)acetylacetonate [Al(AcAc) 3 ] at 310°C in N 2 under ambient pressure. The reaction mechanism and the structure of PACS were investigated in detail by FTIR…
Abstract Conducting polymers such as polyaniline and polypyrrole exhibit novel sensoric properties and are able to interact chemically or electrochemically with the species of interest for detection. In the current investigation, construction of a sensor based on an electrochemical reaction between Cr VI and a thin la…
The adsorption properties of a rake-type siloxane surfactant (consisting of a poly(dimethylsiloxane) backbone with grafted polyether) on carbon black (CB) nanoparticles have been investigated. The CB particles have fractal structure according to transmission electron microscopy and small-angle neutron scattering (SANS…
The unusually broad diameter distribution of single wall carbon nanotubes (SWCNTs) in a HiPCO derived sample made it possible to observe for the first time a selective loss of Raman resonances corresponding to large diameter tubes upon both p- (FeCl3) and n-type (K) doping.
We present coupled electronic oscillator calculations on conjugated dendrimers that can be used in organic light-emitting diodes. The results indicate that the nature of the excited state in these materials can be strongly influenced by electronic coherences. We use the collective electronic oscillator model approach…
Abstract Branched poly(ether sulfone)s were prepared from 1,1,1‐tris(4‐hydroxyphenyl) ethane and 4,4′‐difluorodiphenyl sulfone (DFDPS) either by polycondensation in dimethyl sulfoxide with the elimination of water or via the silyl method in N ‐methylpyrrolidone. With an exact 1/1 stoichiometry, crosslinking was avoida…
A series of well-defined dumbbell copolymers of (PBd) 32 PS(PBd) 32 type, with the same polystyrene (PS) connector (10 600 g/mol) and 32 polybutadiene (PBd) branches of varying molecular weight (1200, 5000, 15 000, 43 000 g/mol) on each end, were synthesized, and their viscoelastic properties were investigated. For th…