Materials Literature
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Copper phthalocyanine (CuPc) thin films have been deposited by a recently developed plasma-based method named glow-discharge-induced sublimation (GDS). The deposition of CuPc films has also been obtained by vacuum evaporation (VE) and the comparison of the two methods shows important structural differences. FT-IR and…
The effect of catalyst support and reactant on the yield and structure of carbon growth has been investigated in the chemical vapor deposition (CVD) process. Powder Fe and Fe/Al(2)O(3) were the catalysts studied, and CO/H(2), CO, CH(4), and C(2)H(6)/H(2) were used as gas precursors. Platelet and fishbone-tubular struc…
Iron octamethylporphyrinogens were prepared and structurally characterized in three different oxidation states in the absence of axial ligands and with sodium or tetrafluoroborate as the only counterions. Under these conditions, the iron- and ligand-based redox chemistry of iron porphyrinogens can be defined. The iron…
Using magnetic circular dichroism (MCD) spectroscopy together with DFT calculations, the spin density distributions in five-coordinate [Fe(TPP)(NO)] (I) and six-coordinate [Fe(TPP)(MI)(NO)] (II, MI = 1-methylimidazole) are defined. In the five-coordinate complex, a strong Fe-NO sigma bond between pi(*)(h) and d(z)(2)…
The tetranuclear complex [MnIII2NiII2Cl2(salpa)2] (salpa = N-(2-hydroxybenzyl)-3-amino-1-propanol) has a spin ground state of S = 6 and was confirmed to be an SMM based on a steplike feature of the magnetization hysteresis loop at 0.55 K.
We report the transmission characteristics of a two-dimensional (2D) composite metamaterial (CMM) structure in free space. At the frequencies where left-handed transmission takes place, we experimentally confirmed that the CMM structure has effective negative refractive index. Phase shift between consecutive numbers o…
The bulk enrichment and separation of single-walled carbon nanotubes (SWNTs) by diameter has been achieved through ultracentrifugation of DNA-wrapped SWNTs in aqueous density gradients. The separation is identified by the visual formation of colored bands of SWNTs in the density range of 1.11-1.17 g cm(-3). The optica…
The Sm atom of the title compound, [Sm(CH4N2O)8]I3, is eight-coordinate, with eight monodentate urea ligands bound through their O atoms; the corresponding polyhedron is a distorted double-capped trigonal prism. All the urea molecules are involved in intramolecular hydrogen bonds. This compound is a rare example of a…
We study theoretically mixed solutions of homopolymer and diblock copolymer chains. The solvent is a poor solvent for the homopolymers and a selective solvent for the copolymers. We find that the formation of copolymer micelles containing also the insoluble chains allows for an increased solubility of the homopolymers…
Seventeen members of the solid solution series Ba 2 - x Sr x LuBiO 6 have been prepared, and their crystal structures were studied using a combination of powder synchrotron X-ray and neutron diffraction methods. The oxides all adopt a double perovskite-type A 2 BB‘O 6 (A = Ba, Sr; B = Lu, B‘ = Bi) structure as a conse…
Information about the metal phase in a supported-metal catalyst can be obtained using anomalous small-angle X-ray scattering (ASAXS). The difference between the scattering profiles for SAXS at two different wavelengths near the metal's absorption edge is essentially the scattering of the metal alone. Novel in situ ASA…
L 1 0 -type Co100−xPtx single crystals in a single variant state were prepared by ordering under a compressive stress in order to determine accurately the uniaxial magnetocrystalline anisotropy constant KU. Both the lattice constants a and c increase with increasing Pt concentration, whereas the axial ratio c∕a become…
Reduction of iron oxide/CeO 2 solid due to methane anaerobic combustion has been studied using in situ time-resolved synchrotron X-ray powder diffraction and mass spectrometry measurements. All the chemical reactions involved in the process have been mapped. Rietveld profile fitting analysis has given a quantitative e…
A new compact cell for in situ synchrotron X-ray diffraction studies of adsorption or catalysis reactions has been designed to enable high performance whilst minimizing difficulties in use. It includes a system for simple insertion and alignment of capillary samples and an original miniaturized furnace providing excel…
Metal foils of complex, three-dimensional topographies are prepared by electroless deposition on surfaces of micropatterned hydrogel supports (see Figure). The foils can either be freestanding or supported by a photocurable polymer. It is possible to selectively metallize different portions of the micropattern embosse…
Dielectric properties and domain structure have been measured as functions of temperature in a (001)-oriented Pb(Mg1∕3Nb2∕3)0.65Ti0.35O3 (PMNT35%) single crystal with and without a prior dc electric (E)-field poling. Without E-field poling, the dielectric loss exhibits a frequency-dependent maximum in the region of 12…
We report the effect of reversible switching between blue-green and red cathodoluminescence (CL) in poly(4,4′-diphenylene diphenylvinylene) (PDPV), mixed with the 12–60nm size ZnO:Mg nanoparticles by applying an electric field. We found that without electric field the CL emission maximum is in the blue-green region fo…
Ferromagnetic In1−xMnxAs semiconductor films (x=0.12) were grown by low-temperature molecular beam epitaxy on In1−yAlyAs–AlSb–GaAs hybrid substrates. The built-in compressive strain induced by the In1−yAlyAs buffer leads to an in-plane easy axis of magnetization. Detailed studies of magnetic anisotropy by ferromagneti…
Dimethyl gold complexes bonded to partially dehydroxylated MgO powder calcined at 673 K were synthesized by adsorption of Au(CH3)2(acac) (acac is C5H7O2) from n-pentane solution. The synthesis and subsequent decomposition of the complexes by treatment in He or H2 were characterized with diffuse reflectance Fourier tra…
The two-dimensional (2D) dilute magnetic semiconductors Cd 1 - x Mn x Se·L 0.5 (L = ethylenediamine, or en, and 1,6-hexanediamine, or hda, x = 0−0.8) were synthesized in an autoclave at 120 °C. Ab initio structure solution from X-ray powder diffraction reveals the host compound CdSe· hda 0.5 (space group, Pbca, a = 6.…