Materials Literature
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A simple bottom-up approach allows the aggregation of nanoparticles to a variety of superlattices with controlled collective properties. For example, monodisperse magnetic Fe2O3 nanocrystals (blue) and PbSe semiconductor quantum dots (red) form a binary three-dimensional AB13-type superlattice by self-assembly (see pi…
Using Al-Cu alloys, containing between 0.1 and 26 atom % Cu, deposited by magnetron sputtering and etching in sodium hydroxide solution, enrichments of copper have been developed selectively in the alloys. Rutherford backscattering spectroscopy and medium energy ion scattering quantified the enrichments and their loca…
We investigated the microscopic structure of FePtCu ternary ordered alloys from both theoretical and experimental points of view. From the theoretical viewpoint, first principles calculation was carried out based on the full-potential linear augmented plane wave method in order to obtain the electronic structure and m…
The conductivity κ of propylene carbonate-diethyl carbonate (PC-DEC) and PC-EC (ethylene carbonate) solutions of was experimentally determined at temperatures θ from 60 to −80°C and at salt molalities m from 0.2 to and solvent compositions w from 0 to 0.7 weight fraction of DEC for the former solution and from 0.3 to…
Three conducting BEDT-TTF charge-transfer salts with tris(oxalato)metallate anions have unit cells containing both[small alpha] and [small beta][double prime] donor packing motifs.
Abstract Summary: Piezoelectric properties of a chiral smectic liquid crystalline elastomer are investigated by means of dynamic electromechanical measurements. We have confirmed that the piezoelectric constant is fairly large in the chiral smectic C (SmC*) phase. A relaxation of the piezoelectric constant is observed…
Photoluminescence measurements were used to investigate the effect of atomic and molecular hydrogen on the passivation of Si nanocrystals in SiO2. Significant increases in the luminescence intensity and lifetime were found in samples coated with a thin Al layer prior to a standard anneal in molecular hydrogen. This is…
Two metastable calcium carbonate polymorphs, hemispherical vaterite and needle-like aragonite, are selectively formed at the air/water interface by the mediation of poly(ethyleneimine)(with molecular weights of 25000 and 2000, respectively) dissolved in supersaturated calcium bicarbonate solution.
An anhydrous and crystalline ruthenium oxide thin film electrode with high specific capacitance and good high rate capability was prepared by the electrostatic spray deposition technique for use in a supercapacitor electrode material. Various experimental techniques were used to observe physical, chemical, and electro…
Changes in surface plasmon resonance (SPR) bands induced by surface-enhanced Raman scattering (SERS) quenching of rhodamine 6G (R6G) molecules adsorbed on single Ag nanoparticles were investigated by light scattering microspectroscopy. It was found that SPR bands show a peak shift to a higher-energy side and that thei…
The expected time evolution of the secondary electron emission (SEE) yield, δ, and charging of insulators irradiated with keV electron probes of various sizes is deduced from the use of basic laws of electrostatics. Simple models of trapped charge distributions permit, next, quantitative estimates. With respect to the…
The microstructure exerts a strong influence on the mechanical properties and on the integrity of welded joints. Prediction of the formation of the microstructure during welding and of other solidification processes may be an important and supporting factor for technology optimization. Nowadays, increasing computing p…
Abstract Different kinds of organophilic montmorillonite cotreated by cetyltrimethyl ammonium bromide (CTAB) and aminoundecanoic acid (AUA) were synthesized and applied to prepare polyurethane/montmorillonite nanocomposites via solution intercalation. The results of wide‐angle X‐ray diffraction (WAXD) and transmission…
2,2[prime or minute]-3,3[double prime]-Terthiophene derivatives undergo photochemically reversible cyclization and cycloreversion reactions. The absorption peak wavelength changed systematically with substitution of the phenyl rings at 5-, 5[prime or minute]- and 5[double prime]-positions of the thiophene rings, which…
Alkyl radical obtained by irradiation of tetrabutylammonium decatungstate in acetonitrile in the presence of cycloalkanes (C5H10, C6H12, C7H14) are efficiently trapped by electrophilic alkenes (acrylonitrile, isopropylydenmalonitrile, isopropylydencyanoacetate) to give the corresponding alkylated aliphatic nitriles. T…
Anodic etching of SiC yields a highly monodisperse distribution of nanometer dimension porous structures which extend to a significant depth. Cathodoluminescence (CL) studies of the porous layers yield luminescence peaks in the UV region, above the band gap energy of bulk SiC. Higher etching current densities produce…
The virtual source sizes of individual multiwalled carbon nanotube electron emitters were investigated with a point projection microscope. The average radius of the virtual source size was found to be 2.6 nm, which does not correspond to the standard model of a field emitter. Instead, a model based on a flattened cap…
Cluster von Magneten: Hier werden die ersten Mangan-Einzelmolekülmagnete (SMMs) vorgestellt, die ausschließlich aus dreiwertigen Metallzentren bestehen. Es handelt sich um sechskernige Cluster mit zentraler [MnIII6(μ3-O)2(μ2-OR)2]12+-Einheit (siehe Bild, Mn gelb, O rot) und einem S=4-Grundzustand. Durch Variation der…
Hydrophobic vitamin B(12) was covalently immobilized onto a platinum electrode surface, and the immobilized complex exhibits Co(ii)/Co(i) redox couple and in situ the Co(i) species reacts with phenethyl bromide to form styrene under irradiation with visible light with a turnover number of over 6000 for 1 h.
Self-assembled growth of ZnO films modified with -bis(ethylenesulfate)-3,4,9,10-perylene tetracarboxylic acid diimide has been realized by a one-step cathodic electrodeposition. Scanning electron microscopy and X-ray diffraction examination of the hybrid films has revealed morphological and structural changes with inc…