Materials Literature
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Durch chemische Gasphasenabscheidung von Ethen wurden Kohlenstoffnanofasern (CNFs) auf der Oberfläche oder im Innern von Aktivkohle immobilisiert (siehe Bild). Experimente zeigen, dass diese Form der Nanostrukturierung neuartige Adsorptionsstellen auf der Oberfläche der Aktivkohle bereitstellt.
Uniformly cold-compressed nanographite sheets in diamond anvil cells (DAC) are found to transform from soft into hard phase at about 17 GPa using molecular dynamics simulations. The hard phase can reach the compressive strength of about 150 GPa. Finite element analyses show that high stress concentrations occur along…
Die Verknüpfung der Strukturmotive 21,23-Dithiaporphyrin und Acetylen liefert das einzigartige 18-π-aromatische [18]Triphyrin(4.1.1)-Gerüst (siehe Struktur; C grau, N blau, S gelb). Die Butineinheit, die die beiden Thiophenringe verbindet, weicht leicht von der Linearität ab und beschreibt einen aus dem Makrocyclus we…
Abstract F‐18‐labeled porphyrins, the potential tracing and detecting agents for tumor have been synthesized and characterized by two convenient routes: one is a mixed aldehyde condensation, which involves acid‐catalyzed condensation of pyrrole, m ‐anisaldehyde and 4‐[ 18 F]fluorobenzaldehyde. The other is the acid‐ca…
Doping into nanotubes is an attractive and significant way to tailor their electron transport and emission properties. This article reviews some recent experimental and theoretical advances in the studies of doping behaviors in carbon nanotubes and gallium nitrogen nanotubes, and doping effects on their field electron…
Inelastic neutron-scattering spectra were measured on stoichiometric ${\mathrm{Fe}}_{0.50}{\mathrm{Cr}}_{0.50}$ prepared as a body-centered-cubic (bcc) solid solution, and after increasing amounts of chemical unmixing on the bcc lattice induced by annealing the solid solution at 773 K. These spectra were reduced by a…
Nanoparticulate ferrites such as manganese zinc ferrite and nickel zinc ferrite hold great promise for advanced applications in power electronics. The use of these materials in current applications requires fine control over the nanoparticle size as well as size distribution to maximize their packing density. While th…
A ceramic sample of a layered cuprate of Tl 2 Ba 2 Ca 2 Cu 3 O x and Tl 2 Ba 2 Ca 1 Cu 2 O x , so-called Tl-based 2223 and 2212 compounds, was investigated by the measurement of the dielectric constants (ε′ and ε′′), the dielectric loss (tanδ), and the conductivity (σ ac ) as a function of temperature (80–300 K) and f…
Fusion of the structural motifs 21,23-dithiaporphyrin and acetylene yields the 18-π-aromatic [18]triphyrin(4.1.1) framework (see structure; C gray, N blue, S yellow). The butyne moiety that joins the two thiophene rings reveals a slight distortion from linearity, showing a bowlike deformation directed out of the macro…
A Monte Carlo study is carried out to quantify the effects of seed anisotropy and interseed attenuation for 103Pd and 125I prostate implants. Two idealized and two real prostate implants are considered. Full Monte Carlo simulation (FMCS) of implants (seeds are physically and simultaneously simulated) is compared with…
Down to the wire: A new class of 1D chain, [-Pt-Rh-Pt4-Rh-Pt-Cl-]n, composed of Pt–Pt and Pt–Rh dimeric complexes linked through metal–metal bonds has been prepared (see structure). This chain of mixed-valent metals (PtII/PtIII and RhII/RhIII) contains one unpaired electron in each octameric segment, leading to unique…
It is shown that CaCu3Ti4O12 grains in a polycrystalline specimen have domains and comparatively thick domain walls. The orientations of the domains within a grain were observed to be slightly tilted toward each other, suggesting the presence of lattice distortions. Multiple reflection spots in the electron diffractio…
Abstract Phosphomolybdic acid/polyvinylpyrrolidone hybrid films were found to show visible light photochromism. It is identified that the intra‐supramolecular charge transfer between the inorganic and organic molecules is responsible for the visible‐light coloration. Interestingly, the films show photo‐memory and ther…
This paper reviews the syntheses, particle-size measurements and various aspects of the optical spectra of lanthanide ion doped insulating nanomaterials, with the focus upon the sesquioxides, and it contrasts their behaviour with bulk materials.
The William B Morgan Large Cavitation Channel (LCC) is a large variable-pressure closed-loop water tunnel that has been operated by the US Navy in Memphis, TN, USA, since 1991. This facility is well designed for a wide variety of hydrodynamic and hydroacoustic tests. Its overall size and capabilities allow test-model…
Abstract Following an earlier study of the uncertainties for defining thicknesses by angle‐resolved XPS, one of the major instrumental uncertainties has been evaluated that limits both precision and accuracy. For analysis of the thicknesses of SiO 2 on Si, certain angles of emission have been recommended, but an error…
We report inelastic neutron scattering measurements on polystyrene thin films in a glassy state in the meV region. We found in elastic scattering that the mean square displacement <u2> decreased with film thickness, and hence the corresponding force constant f increased. In inelastic and quasielastic scattering, we ob…
The relationships between the structural features and mechanical properties of electrospun segmented polyurethane (SPU) meshes and electrospinning parameters such as formulation (e.g., polymer concentration and solvent mixing ratio) and operation parameters (e.g., applied voltage, air gap, and flow rate) were studied…
The development and properties of doped nanomaterials including doped titanium dioxide, doped silicon, and doped cadmium telluride are reviewed, as well as their ultrafast dynamics. Doping nanomaterials provides a flexible way to tune to the properties of the materials while maintaining their high surface areas. The e…
Abstract A simple, one‐step synthetic route to prepare ordered mesoporous silica monoliths with controllable quantities of metal oxide nanocrystals in their channels is presented. The method is based on the assisted assembly effect for mesostructure‐directing of the metal complexes formed by the interaction of metal i…