Materials Literature
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The photochemistry, electrochemistry, and electrogenerated chemiluminescence (ECL) of five boron-based laser dyes (BODIPY, PM 546, PM 567, PM 580, PM 597) have been investigated. These show high fluorescence quantum yields (Φ > 0.85) for all dyes except PM 597 (Φ ≈ 0.41), because of the high degree of substitution and…
We study the morphological evolution of surfaces during ion sputtering and we compare their dynamical roughening with aeolian ripple formation in sandy deserts. We show that the two phenomena can be described within the same theoretical framework. This approach explains the different dynamical behaviors experimentally…
The local atomic order of an amorphous Ga$_{50}$Se$_{50}$ alloy produced by Mechanical Alloying (MA) was studied by the Extended X-ray Absorption Fine Structure (EXAFS) and X-ray Diffraction (XRD) techniques and by Reverse Monte Carlo (RMC) simulations of its total x-ray structure factor. The coordination numbers and…
The properties of the contacts between single-walled carbon nanotubes (SWNTs) and Au electrodes are studied using scanning Kelvin probe and electrostatic force microscopies. Contact potential differences and local dipoles at the SWNT/Au interface are determined under various conditions involving gas adsorption and sur…
Gold is not as noble as it is widely assumed—at least in the form of nanostructured gold clusters or the depicted multiwalled nanotubes. Recent progress shows the potential use of such structures, for example, in catalysis, molecular electronics, or as bioconjugate probes for gene analysis.
An organic−inorganic hybrid heterogeneous catalyst system was synthesized by covalently anchoring oxodiperoxo molybdenum complexes [(L−L)MoO(O 2 ) 2 ] (L−L = (3-triethoxysilylpropyl)[3-(2-pyridyl)-1-pyrazolyl]acetamide) onto the mesoporous silica MCM-41 (Si−MCM-41) and aluminosilicate MCM-41 (Al−MCM-41) materials. Cha…
Electron-lattice energy exchanges are investigated in gold and silver nanoparticles with sizes ranging from 30 to 2.2 nm embedded in different environments. Femtosecond pump-probe experiments performed in the low-perturbation regime demonstrate a strong increase of the intrinsic electron-phonon interaction for nanopar…
Poly(amidoamine) (PAMAM) dendrimers of generations G0, G1, G2, G3, G4, and G6 are investigated by potentiometric (acid−base) titrations. The data are interpreted with a site binding model, which offers the possibility to model the titration curves for all generations of the dendrimers and to describe all dendrimers wi…
Titania/polymer capsules and hollow titania spheres are prepared by using sulfonated-polystyrene core–shell gel particles as templates. The titania shell thickness and the cavity size are controlled in the entire particle radius range. If an electric field is applied during synthesis, hollow spheres with pillared surf…
Abstract The growth process, stability of GaP nanocrystals and the formation of Ga 3 P nanocrystals under solvothermal conditions were investigated. At moderate reaction times and temperature, the growth process is mainly in accordance with the Ostwald ripening mechanism, which is the dissolving of the smaller GaP cry…
Abstract The dinucleating ligand 1,2‐bis(3,5‐di‐ tert ‐butyl‐2‐hydroxyphenyl)oxamide [H 4 (bbpo)] has been synthesized. From its reaction with GaCl 3 or FeCl 3 in CH 3 OH/NaOH the salts [N( n Bu) 4 ] 2 [M III 2 (bbpo)Cl 4 ] [M = Ga ( 1 ), Fe ( 2 )] have been isolated as crystalline solids upon addition of [N( n Bu) 4…
Abstract Theoretical methods based on density functional theory using hybrid functionals provide good estimates of the exchange coupling constants for complexes with metals of the second transition series, with accuracy similar to that previously obtained for complexes with lighter transition metals. The influence of…
A weak ferromagnetic phase is shown in pressed pellets of partially doped poly(3-methylthiophene) (P3MT) in the whole range from 1.8 to 300 K in magnetic measurements. Thermoremanence data have been used to estimate the suppression of this phase to be around 815 K. We also show that instead of the classical antiferrom…
Abstract Polycrystalline CdS nanotubes (CNTs) were successfully achieved by a two‐step treatment, i.e. (CdS+Cd) nanowires (electrodeposition and sulfuration process in anodic alumina membrane) ⇄ CNTs (dissolution method of removing Cd in 0.5 M HCl). Having been characterized using X‐ray diffraction and scanning electr…
A detailed study of the electronic transport and magnetic properties of ${\mathrm{Fe}}_{1\ensuremath{-}x}{\mathrm{Cu}}_{x}{\mathrm{Cr}}_{2}{\mathrm{S}}_{4}$ $(x<~0.5)$ on single crystals is presented. The resistivity is investigated for $2<~T<~300\mathrm{K}$ in magnetic fields up to 140 kOe and under hydrosta…
We used the x-ray extended-range technique to measure the x-ray mass attenuation coefficients of silicon with an accuracy between 0.27% and 0.5% in the $5\mathrm{keV}\ensuremath{-}20\mathrm{keV}$ energy range. Subtraction of the x-ray scattering contribution enabled us to derive the corresponding x-ray photoelectric a…
The crystal and magnetic structures of the $A{\mathrm{LaMnMoO}}_{6}$ $(A=\mathrm{B}\mathrm{a},\mathrm{S}\mathrm{r})$ double perovskites have been studied. The Sr compound is monoclinic (space-group ${P2}_{1}/n)$ and does not exhibit long-range magnetic order. The crystal lattice of the Ba compound is pseudocubic, alth…
Abstract New polymethyloxazoline hydrogels are synthesized by the cationic ring‐opening copolymerization of 2‐methyl‐2‐oxazoline and 2,2′‐tetramethylenebis(2‐oxazoline), using random copolymers of chloromethylstyrene and methyl methacrylate, or of chloromethylstyrene and styrene as macroinitiators. The synthesis is ca…
The stability and electronic properties of various structures of carbon phosphide as well as other possible group IV-V compounds with 1:1 stoichiometry have been examined using first-principles calculations. Similar to CN, layered structures of CP are found to be energetically stable. Among all the structures consider…
The low-frequency single-particle and collective excitations of single-walled carbon nanotubes are studied in the presence of a magnetic field. They strongly depend on the magnitude and direction of the magnetic field, transferred momentum, temperature, nanotube geometry, and Zeeman splitting. A narrow-gap nonarmchair…