Materials Literature
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An infrared-absorption band centered at 0.85 eV, which is below the big optical absorption at the charge-density-wave (CDW) gap energy of 1.85 eV, has been observed for semiconducting single crystalline Ba(1-x)KxBiO3. With substituting K for Ba, the spectral weight of the new band increases with x, while that of the C…
Abstract Multiwalled carbon nanotubes (MWNTs) were functionalized by a free‐radical reaction of vinyltriethoxysilane and were blended with poly(urea urethane) (PUU) containing poly(dimethylsiloxane) as a soft segment. PUU was end‐capped with aminopropyltriethoxysilane (A‐silane) or phenyltriethoxysilane (P‐silane).A‐s…
c -axis-oriented Ca3Co4O9 thin films have been grown directly on glass (fused silica) substrate by pulsed laser deposition. Detailed microstructure analysis showed stacking faults abundant throughout the films. However, the Seebeck coefficient (∼130μV∕K) and resistivity (∼4.3mΩcm) of these films on glass substrate at…
The dependence of the dielectric constant and its losses on the applied field is studied, as well as the correlation between the dielectric constant and dielectric losses. The results show that hard lead zirconate titanate cannot be described by the Rayleigh model, so the hysteretic response of those materials cannot…
The crystal size distribution theory (CSD) is used to derive nucleation and growth rates ( J, G ) of pyroxene, plagioclase and Fe-Ti oxides in basalt glass during heat treatment under atmospheric conditions. The glass was sampled from active Pu9u O9o, Kilauea, Hawaii, by hammer-dipping and subsequent quenching. Temper…
A number of Pseudomonas strains accumulated polyhdroxyalkanoate (PHA) from a variety of aromatic hydrocarbons. In many strains the level of PHA accumulation was dependent on the side chain length of the phenylalkanoic acid provided for growth. 4 of the 8 strains accumulated increased levels of PHA as the side chain le…
We report on the simultaneous definition and fabrication of Bragg gratings and ridge waveguides using wafer stepper lithography and reactive ion etching, respectively. Single-longitudinal mode emission from two-section ridge-waveguide distributed feedback lasers with sixth and seventh order gratings will be reported.…
Habit forming: Amphiphilic lipopeptide 1 forms a stable monolayer with an antiparallel β-sheet conformation. This monolayer interacts with calcium ions and can be used as a biomimetic mineralization template for the formation of a new crystal habit of calcite (see SEM image). The nucleation of different crystal faces…
Abstract We synthesized a novel phosphorus‐containing triamine [9,10‐dihydro‐9‐oxa‐10‐phosphaphenanthrene 10‐yl‐tris(4‐aminophenyl) methane (dopo‐ta)] from the nucleophilic addition of 9,10‐dihydro‐9‐oxa‐10‐phosphaphenanthrene 10‐oxide and pararosaniline chloride, using triethylamine as an acid receiver. We confirmed…
Incorporation of an extended family of multi[(porphinato)zinc(II)] (PZn)-based supermolecular fluorophores into the lamellar membranes of polymersomes (50 nm to 50 mum diameter polymer vesicles) gives rise to electrooptically diverse nano-to-micron (meso) scale soft materials. Studies that examine homogeneous suspensi…
Eine temperaturabhängige Emission zeigen CdTe-Nanopartikel, die über flexible PEG-Ketten, die wie molekulare Federn wirken, mit Au-Nanopartikeln verknüpft sind (siehe Bild). Die Länge der PEG-Federn ändert sich mit der Temperatur, was zu Änderungen in der CdTe-Emission als Folge von Plasmon-Exciton-Wechselwirkungen fü…
Block copolymer amphiphiles that self-assemble into membranes present robust and functionalizable alternatives to biological assemblies. Coarse-grained molecular dynamics shows that thick bilayers of A-B copolymers accommodate protein-like channels and also tend to regulate transport. This occurs as flexible, hydrophi…
Abstract “Green” composites were successfully prepared from the thermoplastic cornstarch (TPCS) and activated‐montmorillonite (MMT) by the method of blend extrusion. The thermoplastic cornstarch was plasticized with novel plasticizers urea and ethanolamine, and the activated‐montmorillonites were obtained using ethano…
Abstract This paper examines the effect of foam density, oil viscosity, and temperature on the oil sorption behavior of polyurethane foams. Four polyurethane foams with different densities and two oil types with different viscosities were investigated. The amount of oil uptake was measured gravimetrically. Oil transpo…
We report the structures of dispersible units, a most fundamental but minimal dispersible structural unit of a carbon black (CB) filler that is formed in two kinds of rubber (polyisoprene and styrene-butadiene random copolymer) matrices under a given processing condition. The results obtained from various small-angle…
The physical properties of a linear carbon chain encapsulated within single-walled carbon nanotubes are investigated with density-functional theory using periodic boundary conditions. The dominant feature of an isolated carbon chain is the Peierls dimerization and the opening of a Peierls gap. The two weakly interacti…
We present first-principles total-energy calculations of adsorption and reaction of molecular oxygen on the $\mathrm{ZnO}(10\overline{1}0)$ surface. We find that, on stoichiometric $\mathrm{ZnO}(10\overline{1}0)$ surfaces, the adsorption is fully molecular with a small adsorption energy and the dissociation is energet…
Abstract The optimal synthetic conditions of poly(lactic acid‐ co ‐glycolic acid) (PLGA) via melt copolycondensation directly from L ‐lactic acid ( L ‐LA) and glycolic acid (GA) with a feed molar ratio of 50/50 are discussed; the important drug‐delivery carrier PLGA50/50 is used as a special example. With reaction con…
We describe the fabrication of roselike microstructures by the direct in situ hydrothermal synthesis method. The as-prepared roselike microstructure film exhibits excellent superhydrophilic properties, absorbing a water droplet of 4 μL in less than 40 ms. Moreover, after a further modification with a self-assembled mo…
Well-aligned diluted magnetic semiconductor Zn1−xMnxO nanowires have been fabricated at 850°C from a self-formed ZnO substrate using a chemical vapor deposition method. The as-synthesized Mn-doped ZnO nanowires were characterized by field emission scanning electron microscopy and transmission electron microscopy (TEM)…