Materials Literature
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We have studied the experimental and theoretical aspects of the interaction of gold nanoshells on a waveguiding structure. Gold nanoshells are core−shell particles consisting of a silica core surrounded by a thin gold shell. The waveguiding structure consists of a 2 μ m thick layer of gold with a dielectric layer of v…
Abstract Electrochemical copolymerization of pyrrole and indole was performed galvanostatically in a solvent of acetonitrile (AN)/water (vol %: 99/1). The product obtained was characterized by cyclic voltammetry and infrared spectroscopy. The influence of the monomer feed ratio of pyrrole and indole on the synthesis o…
A new series of polymeric chainlike materials exhibiting the spin crossover phenomenon has been synthesized in aqueous conditions using different iron(II) salts and 4-(formylamino)-1,2,4-triazole (fatrz). The magnetic and thermogravimetric behaviors of the compounds of general formula [Fe(fatrz) 3 ](A) 2 · x H 2 O are…
On the surface of MgO nanoparticles 1- and multiple (n = 3 and 4) coordinated hydroxyl groups are generated site-selectively and studied by transmission infrared spectroscopy. Their formation is based either on the stepwise dehydration of previously hydrated samples or on simple surface reactions involving molecular h…
In situ high-resolution transmission electron microscopy is used to study grain boundary structure and kinetics in bicrystalline Au films at elevated temperature. We report the first direct evidence for the existence of cooperative atomic motion in grain boundary migration. Certain nanoregions at grain boundaries, typ…
The composites [{Ba(DMSO)5(H2O)}2(SiMo12O40)] (1) and [{Ba(DMSO)3(H2O)3}{Ba(DMSO)5(H2O)}(GeMo12O40)] (2) have been synthesized and characterized by IR and UV spectroscopy, and single-crystal X-ray structural analysis. Compound 1 forms an unprecedented one-dimensional linear chain built from alternating polyanions and…
Abstract A series of damping rubbers based on poly(meth)acrylate and poly(meth)acrylate‐containing silicone rubbers has been prepared. The dynamical mechanical properties were evaluated by using a dynamic mechanical viscoelastometer (DMA). A detailed investigation is reported on the relationship of the damping capabil…
Application of pressure to the nonemitting system ${\mathrm{Lu}}_{2}{\mathrm{O}}_{3}:{\mathrm{Ce}}^{3+}$ leads to the generation of luminescence in the visible. The luminescence is assigned to the $5\stackrel{\ensuremath{\rightarrow}}{d}4f$ transition of ${\mathrm{Ce}}^{3+},$ and is attributed to a pressure-induced el…
Employing photoelectron emission microscopy (PEEM) and scanning photoelectron microscopy (SPEM) the surface reduction of zirconia solid electrolyte under cathodic polarisation has been observed in situ. A microstructured platinum film and a porous platinum paste have been used as electrodes. Starting from the three ph…
Abstract Lamellae‐forming styrene/butadiene star block copolymers are studied to investigate the influence of morphology on micromechanical deformation mechanisms and mechanical properties by using transmission electron microscopy and tensile testing. A large homogeneous plastic deformation of polystyrene (PS) lamella…
Ranjan et al. [Phys. Rev. B 65, 060102(R) (2002)] have recently presented results of a powder neutron-diffraction study of the high-temperature monoclinic ${(F}_{M}^{\mathrm{HT}})$ to low-temperature monoclinic ${(F}_{M}^{\mathrm{LT}})$ phase transition in $\mathrm{Pb}({\mathrm{Ti}}_{1\ensuremath{-}x}{\mathrm{Zr}}_{x}…
Interactions in semiconductor nanocrystal assemblies have been studied on films of the cluster crystal compounds Cd 17 S 4 (SCH 2 CH 2 OH) 26 and Cd 32 S 14 (SCH 2 CH(CH 3 )OH) 36 prepared by spin coating. Misinterpretations of observed alterations of transition energies in theses structures are avoided by the choice…
We report ab initio analysis of current-voltage $(I\ensuremath{-}V)$ characteristics of carbon nanotubes with nitrogen substitution doping. For zigzag semiconducting tubes, doping with a single N impurity increases current flow and, for small radii tubes, narrows the current gap. Doping a N impurity per nanotube unit…
In this paper we investigate the upconversion luminescence of bulk and nanocrystalline Lu 1.98 Er 0.02 O 3 following excitation into the 4 I 11/2 level using 980 nm radiation. After NIR continuous wave excitation, blue, green, and red emissions were observed for both samples under investigation with the green emission…
ADVERTISEMENT RETURN TO ISSUEPREVArticleLanthanides in Non-Oxide GlassesJean-Luc AdamView Author Information Laboratoire des Verres and Céramiques, Institut de Chimie de Rennes, Université de Rennes 1, UMR-CNRS 6512, Campus Scientifique de Beaulieu, 35042 Rennes Cedex, France Cite this: Chem. Rev. 2002, 102, 6, 2461–2…
Multiwalled carbon nanotubes (MWCNTs) have been grown on various substrates by thermal chemical vapor deposition using multilayered metal catalysts. Ion beam sputtering is used to deposit various metal layers sequentially. Underlayers of Al (2−20 nm) are shown to influence the growth characteristics with Fe or Ni used…
Carbon nanostructures with unusually large paramagnetic moments have been discovered in a theoretical study of the electronic and magnetic properties of carbon nanotubes bent into toroids. Specifically, nanotori formed from metallic nanotubes with ${\ensuremath{\lambda}}_{F}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex…
The structural and electronic properties of aluminum covered single wall carbon nanotubes (SWNT) are studied from first-principles for a large number of coverage. Aluminum-aluminum interaction that is stronger than aluminum-tube interaction, prevents uniform metal coverage, and hence gives rise to the clustering. Howe…
Electronic band structures for Ba$_{6}$Ge$_{25}$ and Ba$_{4}$Na$_{2}$Ge$_{25}$ clathrates are calculated using linear muffin-tin orbital method within the local density approximation. It is found that barium states strongly contribute to the density of states at the Fermi level and thus can influence the transport pro…
In the framework of a rather conventional cluster approach which combines the crystal field and the ligand field models we have considered different charge transfer (CT) states and O $2p$-Mn $3d$ CT transitions in ${\mathrm{MnO}}_{6}^{9\ensuremath{-}}$ octahedra. The many-electron dipole transition matrix elements wer…