Materials Literature
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We have successfully fabricated ordered, well-crystallized Bi 2 S 3 nanowire arrays embedded in the nanochannels of porous anodic aluminium oxide templates by direct current electrodeposition from a dimethylsulfoxide solution containing BiCl 3 and elemental sulfur. X-ray diffraction and selected area electron diffract…
The ring-opening polymerization of 3-methyl-1,4-dioxan-2-one (MDO) mediated by a catalytic system composed of Y[N(TMS) 2 ] 3 and benzyl alcohol (BnOH) led to a new polymer (PMDO) comprised of perfectly alternating lactic acid and ethylene oxide repeat units. Samples of PMDO were characterized by NMR spectroscopy, size…
Summary In this work the role of xylan in spruce kraft pulp fibres was investigated by selectively removing the pulp fibre xylan and also by sorbing xylan onto the pulp fibres. The effects of xylan removal and sorption on fibre properties were measured and the chemical composition of the fibres and also that of the se…
The temperature dependence of the electrical resistivity and magnetoresistance of Xe-ion beam sputtered Fe-Cr multilayers has been investigated. The electrical resistivity between 5 and 300 K in the fully ferromagnetic state, obtained by applying a field beyond the saturation field (H_sat) necessary for the antiferrom…
We present GW many-body results for ground-state properties of two simple but very distinct families of inhomogenous systems in which traditional implementations of density-functional theory (DFT) fail drastically. The GW approach gives notably better results than the well-known random-phase approximation, at a simila…
Photon emission spectra from submicron silver particles induced by an electron beam have been measured using a light detection system combined with a 200-kV transmission electron microscope. Multiple peaks appear in the spectra associated with collective plasmon excitations produced in the particles by the incident el…
Reinforcement of polymers with a second organic or inorganic phase to produce a polymer composite is common in the production of modern plastics. Polymer nanocomposites (PNCs) represent a radical alternative to these conventional polymer composites [1-5]. The most noteworthy effort in the last 15 years has demonstrate…
By using zeolite Y as a template, a novel microporous carbon with a three-dimensional nano-array structure was prepared. The arrangement and periodicity of this array are identical to those of supercages in zeolite Y crystal. The carbon has a surprisingly high BET surface area (3600 m2/g) with almost no mesoporosity.…
Accurate charge-density distributions of cubic and tetragonal ${\mathrm{PbTiO}}_{3}$ and ${\mathrm{BaTiO}}_{3}$ have been obtained by the MEM(maximum entropy method)/Rietveld analysis using synchrotron-radiation powder data. The Pb-O bonds in tetragonal ${\mathrm{PbTiO}}_{3}$ show rather strong covalency, while those…
Author: Zhang, J. X. et al.; Genre: Journal Article; Issued: 2001-11-19; Keywords: MPI für Intelligente Systeme; Abt. Schütz; ; Title: The coercivity of the melt-spun Sm-Fe-Ga-C permanent magnets and the effect of additives (Nb, Cu and Zr)
Boron carbide thin films were grown by mass selected ion beam deposition using low energy B11+ and C12+ ions at room temperature. The amorphous films exhibit any desired stoichiometry controlled by the ion charge ratio B+/C+. Films with a stoichiometry of B4C showed the optimal combination of a high mechanical strengt…
A cluster glass structure has been observed to occur in nanohybrids consisting of zinc ferrite in an amorphous silica matrix. Such a unique cluster glass structure has been supported by studies of x-ray diffraction, transmission electron microscopy, Fourier transform infrared spectroscopy, and magnetic characterizatio…
Activated carbon (AC) powder as an active electrode material and open-pore nickel foam as a current collector material were used for an electric double layer capacitor (EDLC) with an aqueous electrolyte of KOH mixture. The electrochemical characteristics of the EDLC being made of 3 cm by 3 cm electrode size were inves…
The interfacial width between immiscible low-molecular-weight polymer pairs was investigated using neutron reflection. Deuterated polystyrene (d-PS) and poly(methyl methacrylate) (PMMA) polymers of very low molecular weight ( Mw ) were used. The interfacial width is seen to increase for the low-molecular-weight cases…
We report the 100% correlation between polarized light microscopy (PLM), piezoresponse force microscopy (PFM), and micro-Raman spectroscopy when investigating domain-rich ferroelectric systems. In order to allocate the desired spot on a submicrometer scale, both PLM and PFM were combined to elucidate the effective thr…
Infrared-to-visible upconversion obtained under continuous-wave infrared laser excitation has been investigated in Pr 3+ -doped chalcohalide glasses for different halide (Cl, Br, I) modifiers and Pr 3+ concentrations. The excitation wavelength dependence suggests two different upconversion mechanisms. When the excitat…
X-ray-absorption near edge structure (XANES) measurements have been performed to investigate the local electronic structures of the Fe-catalyzed and stabilized carbon nanotubes (CNT) with various diameters. The intensities of the π*- and σ*-band and the interlayer-state features in the C K-edge XANES spectra of these…
Durch Addition von Nitrenen, Carbenen oder Radikalen gelingt die Herstellung löslicher, einsträngiger Kohlenstoff-Nanoröhren (gezeigt ist hier das carbenfunktionalisierte Addukt), deren Charakterisierung – ein zentrales Problem in der Nanoröhrenchemie – einfach und unproblematisch ist.
The lattice location of phosphorus dopant atoms in n-type homoepitaxial diamond {111} films grown by chemical-vapor deposition has been investigated by Rutherford backscattering spectrometry and particle-induced x-ray emission under ion-channeling conditions. It is found that phosphorus dopant atoms occupy the substit…
Individual dendritic branches can solubilise hydrophilic dyes in apolar media. The functional group at the focal point of the dendritic branch plays a key role in the dye uptake process. Supramolecular interactions between carboxylic acid and amine groups have been shown to be effective in enabling efficient solubilis…