Materials Literature
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Efficient alignment of aqueous carboxyl-functionalized multiwalled carbon nanotubes having remanent iron catalyst particles are carried out in relatively low external magnetic fields ( B ≤ 1017 mT). The nanotubes were grown by catalytic chemical vapor deposition and then functionalized in a multistep oxidation process…
Schalen über Schalen: Einfaches Variieren der Konzentration des Tensids Cetyltrimethylammoniumbromid in einem Templatprozess führt zu ein-, zwei-, drei- und vierschaligen hohlen Cu2O-Kügelchen (siehe Bild). Es ist also möglich, die Synthese vielschaliger anorganischer Hohlkügelchen durch (multilamellare) Vesikel zu st…
Calixarene-Ti complexes were grafted onto SiO2 (0.18-0.24 Ti nm-2) to form isolated and accessible Ti centers persistently coordinated to multidentate calixarene ligands. Grafted Ti-tert-butylcalix[4]arenes gave Ti K-edge absorption spectra with pre-edge features at 4968.6-4968.9 eV, independently of Ti surface densit…
Charge build-up at the solid/aqueous interface is a ubiquitous phenomenon that determines the properties of interfacial electrical double layers. Due to its unique properties, the surface of diamond offers an attractive platform to investigate charging mechanisms in aqueous solutions. We investigate the surface charge…
"Smart tattoo" sensors-fluorescent microspheres that can be implanted intradermally and interrogated noninvasively using light-are being developed as potential tools for in vivo biochemical monitoring. In this work, a platform for enzymatic tattoo-type sensors is described and prototype devices evaluated using glucose…
Molecular junctions of metal/molecule/metal were fabricated with silver nanoparticles and functional molecules through layer-by-layer self-assembly techniques. The Raman scattering of the interconnecting molecules between the silver nanoparticles can be greatly enhanced. For the silver/4-aminothiophenol/silver (Ag/PAT…
Abstract A poly(methyl methacrylate) (PMMA) and nanoclay composite was dispersed into polystyrene (PS) using a twin‐screw extruder. The mixture was then batch foamed with supercritical CO 2 . It was found that the cell density of foams based on the blend is higher than that based on the weight average of the two pure…
The reaction mechanism for the decomposition of nitrous oxide (N 2 O) on hydroxylated and dehydroxylated binuclear oxygen bridged extraframework iron sites in Fe-ZSM-5 has been studied using density functional theory. The results show that if two charge exchange sites in the zeolite are in close proximity, two isolate…
Dielectric spectra of the polyester poly(propylene succinate) were measured upon crystallization. For this model aliphatic polyester the alpha and beta relaxations appear simultaneously and are well resolved in the experimental frequency window. During isothermal crystallization, this fact allows one to use the beta r…
A procedure that enables determining the reaction rate from the analysis of fluorescence anisotropy is described and applied to the investigation of double hydrogen transfer between inner-cavity nitrogen atoms in electronically excited porphycene. Tautomerization proceeds as a thermally activated synchronous double hy…
A new dysprosium complex Dy(PM) 3 (TP) 2 [where PM = 1-phenyl-3-methyl-4-isobutyryl-5-pyrazolone and TP = triphenyl phosphine oxide] was synthesized, and its single-crystal structure was also studied. Its photophysical properties were studied by absorption spectra, emission spectra, fluorescence quantum efficiency, an…
The synthesis and structural characterization of 15R-, 8H-, 6H‘-, and 10H-BaMnO 3 - x and 9R-Ba 0.875 Sr 0.125 MnO 3 is described. Neutron powder diffraction data reveal a strong preference for the location of anion vacancies within the face-shared hexagonal layers of these phases. At high anion vacancy concentrations…
Iron-chromium alloys are characterized by a complex phase diagram, by the small negative enthalpy of mixing at low Cr concentrations in the bcc $\ensuremath{\alpha}$-phase of Fe, and by the inversion of the short-range order parameter. We present Monte Carlo simulations of the binary Fe-Cr alloy based on the cluster e…
We report a robust and practical method for the preparation of water-soluble luminescent quantum dots (QDs) selectively coupled through an amine or thiol linkage to peptide ligands targeted to G-protein coupling receptors (GPCRs) and demonstrate their utility in whole-cell and single-molecule imaging. We utilized a lo…
We report the successful synthesis of Co−Au core−shell nanoparticles by reducing an organo-gold compound onto cobalt seeds with a weak reducer in a nonpolar solvent. The core−shell morphology was unequivocally confirmed by complementary structural, magnetic, and optical property measurements. High-resolution transmiss…
Utilizing the decomposition of metastable Pb 2 Sb 6 Te 11 into PbTe and Sb 2 Te 3, we produced a layered (lamellar) microstructure of PbTe and Sb 2 Te 3 in which the interlamellar spacing can be controlled by the temperature and time of the decomposition process. Adjacent PbTe and Sb 2 Te 3 lamellae are crystallograph…
High Resolution Image Download MS PowerPoint Slide Catalytic oxidation of CO over Ce x Hf 1 - x O 2 (CH; 8:2 mole ratio) and Ce x Zr 1 - x O 2 (CZ; 1:1 mole ratio) nanocomposite oxides reveals that the former combination exhibits more conversion at much lower temperature than the latter. Thermal and textural stability…
Composite organic-inorganic nanoparticles (COINs) are novel optical labels for detection of biomolecules. We have previously developed methods to encapsulate COINs and to functionalize them with antibodies. Here we report the first steps toward application of COINs to the detection of proteins in human tissues. Two an…
Superhydrophobe Oberflächen mit Kontaktwinkeln zwischen 173 und 180° lassen sich einfach durch spontane Abscheidung einer strukturierten Gold- oder Silberschicht und darauf einer selbstorganisierten Monoschicht aus Polyfluoralkylthiol herstellen. Objekte beliebiger Größe und Form können beschichtet werden. Der Metall-…
We present results of numerical calculations of domain-wall resistance in the ferromagnetic semiconductor (Ga,Mn)As. We employ Landauer-Buttiker formalism and the tight binding method. Taking into account the full valence band structure we predict the magnitude of the domain-wall resistance without disorder and compar…