Materials Literature
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Interesting architectures built with electrically conductive substrates of interest for microelectrochemical power sources were obtained by directly growing carbon nanotubes on each microfibre constituting a carbon paper. The carbon nanotubes were fabricated by the chemical vapour deposition technique. Results of elec…
Two solutions of different concentration (that when mixed give rise to a common zeolite precursor gel) are separated by means of a laser-microperforated, 75 μm thick stainless steel sheet. During the hydrothermal synthesis, reactant diffusion from each side promotes crystallization of well-intergrown silicalite-1 crys…
Zn(1-x)Co(x)S nanocrystallites synthesized by the coprecipitation method have been studied. X-ray powder diffraction analysis shows that the solid solubility limit of sphalerite Zn(1-x)Co(x)S can reach x = 16.4%. It is found that when the Co(2+) percentage in the starting solution (Co:(Co+Zn)(solution)) is less than 1…
Stabile Neunfachkoordination: Durch Röntgenbeugung an Einkristallen der Triflatsalze wurden für die Actinoide Americium und Curium hochsymmetrische [M(H2O)9]3+-Einheiten nachgewiesen (siehe Bild; gelb M, rot O). Ein Vergleich der Absorptionsspektren in Lösung bestätigte, dass diese Transplutoniumionen groß genug sind,…
Electrospray ionization multi-stage tandem mass spectrometry (ESI-MSn) and liquid chromatography coupled with on-line electrospray ionization tandem mass spectrometry (LC/ESI-MSn) were performed to elucidate the clearage rule of nine investigated C21 steroidal saponins and identify them in the saponin fraction of 90%…
Hallo− hallo−! A ruthenium(II) complex (1) with the flavin analogue alloxazine (H2allo) has revealed that the ligand anion (Hallo−) forms a four-membered chelate ring. This unprecedented coordination mode of Hallo allows it to form hydrogen bonds with a complementary receptor (e.g. 2), allowing the effects of hydrogen…
We have investigated the superconductivity discovered in boron-doped diamonds by means of $^{11}\mathrm{B}\text{\ensuremath{-}}\mathrm{NMR}$ on heteroepitaxially grown (111) and (100) films. $^{11}\mathrm{B}\text{\ensuremath{-}}\mathrm{NMR}$ spectra for all of the films are identified to arise from the substitutional…
Aligned Cu nanowires were prepared by the reduction of aligned CuO nanowires in electron cyclotron resonance (ECR) hydrogen plasma at room temperature. They are single-crystalline and maintain the original alignment of the CuO nanowires. In contrast, the reduction of CuO nanowires by thermal processing in H(2) has fai…
A chiral, nonracemic ester with a bent-core molecular architecture (see figure) has been synthesized and evaluated for mesomorphic behavior and physical properties. The compound has a low melting point, a chiral smectic C phase with a wide temperature range, and it shows an unusually high tilt angle at a very low valu…
Correlation between the maximum allowable currents and the Young's moduli of the same individual carbon nanotubes was investigated in terms of current-voltage characteristics and the resonant frequencies of the cantilevered nanotubes. The maximum allowable current increases with increasing Young's modulus and saturate…
Ligand-oxidized annulated dinuclear phthalocyanine zinc(II) and lithium(I) complexes absorbing in the NIR region (lambda=1000-2200 nm) with high extinction coefficients are described. Analogous mononuclear Pc complexes were used for comparison. The oxidized Pcs were characterized in solution by electronic absorption,…
A facile strategy affording an intimate nanocomplex of an amine-containing rod-coil triblock copolymer poly(2-(dimethylamino)ethylmethacrylate)-poly(fluorene)-poly(2-(dimethyl amino) ethylmethacrylate) and CdSe nanocrystals is presented. Ligand exchange is observed by (31)P NMR. TEM and UV-vis absorption results indic…
Abstract Polyamide dendrons and dendrimers have been synthesized using a continuous‐flow microreactor. Furthermore, the synthesized polyamide dendron was deposited onto functionalized glass surface through the formation of amide bond using a facile coupling procedure via a microreactor. The dendron deposition process…
We observed current density (J) dependent degradation in field emission current from multiwalled carbon nanotubes (MWCNTs). These degradations are recoverable and can be explained by emission current-induced dislocations along the MWCNTs. MWCNTs grown by thermal chemical vapour deposition (CVD) can emit stable current…
Abstract An investigation was conducted on the effects of photodegradation of multilayer films based on PET copolymers. The films were composed by different layers with PET, PET/PEN, and PET/PEI copolymers with a total thickness of 23 μm. The films produced by coextrusion followed by a biaxial orientation in an indust…
Isothermal titration calorimetry (ITC) and dynamic light scattering (DLS) were employed to study the spontaneous supramolecular complexation of amine terminated PAMAM dendrimer (G3[EDA] PAMAM-NH2) induced by the binding of an anionic surfactant, sodium dodecyl sulfate (SDS). At pH<or=2, SDS molecules bound to protonat…
We show that parallel replica dynamics can be extended to driven systems (e.g., systems with time-dependent boundary conditions). Each processor simulates a replica at a driving rate that is $M$ times faster than the desired rate, where $M$ is the number of processors. As in regular parallel replica dynamics, when a t…
The syntheses and structures of three four-coordinate iron(II) porphyrinates are reported. The three derivatives are tetraarylporphyrin species, where the aryl is either phenyl, p-methylphenyl, or p-methoxyphenyl. One of these derivatives, that of tetraphenylporphyrin, Fe(TPP), is a new crystalline phase that is disti…
Five photochromic chiral azobenzene compounds and one nonphotochromic chiral compound were synthesized and characterized by IR, 1H NMR spectroscopy, and elemental analysis. Cholesteric liquid crystalline phases were induced by mixing of the nonphotochromic chiral compound and one of the photochromic chiral azobenzene…
We report high resolution 15N NMR probing of the solid-solid phase transition of 15N-labeled ammonia borane (NH3BH3) at 225 K. Both the 15N isotropic chemical shift (delta iso) and the spin-lattice relaxation rate (T1-1) exhibited strong anomalies around 225 K. The analysis of T1-1 using the Bloembergen, Purcell, and…