Materials Literature
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By using a combination of high resolution electron microscopy (HREM) and nanoanalytical electron microscopy (EELS-STEM) techniques, the nanoscale evolution of a 5% Pt/Ce 0.8 Tb 0.2 O 2- x catalyst submitted to reduction in pure hydrogen within the 423−1173 K range has been investigated. Fine details about the platinum…
Im Rahmen unserer Untersuchungen zur Reaktivität und zum Synthesepotential von metastabilen Aluminium(I)-halogenidlösungen haben wir Reaktionen dieser Lösungen mit SiCp und GeCp ausgeführt. Dabei konnten neben einem ungewöhnlichen Cluster mit SiAl14-Gerüst, der an einer anderen Stelle beschrieben wurde, die Verbindung…
OBJECTIVE: Due to the thrombogenicity and permanent implant nature of metallic stents, bioresorable synthetic polymers have been proposed for stents and local drug delivery systems. Bioresorbable polyesters like poly(D,L-lactide) demonstrated excellent biocompatibility in various tissues. This paper describes a novel…
Slow dynamics of complex domain structures in phase separating polymer systems is investigated with the use of the self-consistent field (SCF) dynamic density functional (DDF) technique where the free energy of the system is calculated using the path integral formalism of the polymer chain conformation. We apply this…
Article Redetermination of the crystal structure of tetrasodium tetrahedrotetrastannide, Na4Sn4 and tetrapotassium tetrahedro-tetrastannide, K4Sn4 was published on December 1, 1999 in the journal Zeitschrift für Kristallographie - New Crystal Structures (volume 214, issue 4).
The paramagnetic complexes di(mesityl)([5]trovacenyl)borane (5·), (mesityl)di([5]trovacenyl)borane (6··), and tri([5]trovacenyl)borane (7···) were prepared from [5]trovacenyllithium, (η5-C7H7)V(η5-C5H4Li), and (Mes)2BF, (Mes)BF2, and BF3, respectively. The propeller-shaped species 5·, 6··, and 7··· were subjected to X…
Polycarboxylic acids containing more than three carboxylic acid groups react with hydroxyl groups in cotton cellulose and crosslink cotton through stable ester bonds. The aim of this research is to use variable temperature diffuse reflectance infrared spectros copy to study anhydride formation from the thermal dehydra…
Abstract The deintercalation of a low-defect kaolinite intercalated with hydrazine was studied by X-ray diffraction, diffuse reflectance infrared spectroscopy (DRIFT), and Raman microscopy over 30 d. X-ray diffraction showed that the kaolinite was fully intercalated. More than 120 h were required for the hydrazine-int…
Surface Brillouin scattering (SBS) has been used to examine the elastic properties of a supported gold film at high pressure. The velocities of the acoustic modes of a 99 nm thick film have been measured to a pressure of 4.8 GPa, by means of a gem anvil cell with cubic zirconia anvils. A large stiffening of the film h…
Abstract The results of an experimental characterization of the elastic and failure behavior of several 3‐D textile composites under tension, compression, shear, and bending loads are reported in this paper. Composites reinforced with several textile preforms comprising of layer‐to‐layer weaves, through‐the‐thickness…
Semiaromatic polyimides with a polyalicyclic structure were prepared by the polycondensation of bis(aminomethyl)bicyclo[2.2.1]heptane (BBH) with aromatic dianhydrides. The corresponding poly(amic acid)s possessed an inherent viscosity range of 0.60–1.00 dl g −1 . The polyimides were soluble in organic polar solvents a…
Pure head to head (H–H) addition polymers, such as H–H polyolefins, H–H acrylates and H–H poly(vinyl halides), have been of interest for the understanding of the structure/properties relationship of addition polymers. These polymer structures have provided challenges of synthesis, characterization and of the measureme…
A series of MnIII porphyrins progressively halogenated in the β-pyrrolic positions was employed to catalyse the epoxidation of cis-stilbene by iodosylbenzene, and to study the role of the electronic effects on the stereoselectivity of this process. A gradual improvement in the stereoselectivity on increasing the numbe…
Semiconductor boron-doped CVD diamond films were prepared on Si substrates by the hot filament technique. The surface morphology analysis by SEM presented continuous and well faceted films. The samples were grown with different boron concentrations by controlling the B/C ratio in the feeding gas. Raman results showed…
Artificial SrTiO 3 /SrO superlattice thin films epitaxially grown on SrTiO 3 substrates were fabricated by pulsed laser deposition. The artificial superlattices were designed and fabricated by introducing a Ruddlesden-Popper (RP) layer periodically. The intensity of reflection high-energy electron diffraction (RHEED)…
Data on the dielectric properties of the liquid crystal 4-octyl-4′-cyanobiphenyl (8CB) have been determined onto unaligned samples, for a large scale of frequency, as function of temperature. The components of the complex dielectric permittivity as well as the corresponding dielectric parameters were evaluated using H…
Water-soluble manganese porphyrins are catalysts for the decoloration of azo dyes by hydrogen peroxide under mild conditions (pH 8.0 and 25°C). The decoloration rate depends on the structure of the manganese porphyrin and the added ligands.
The etching characteristics of CVD (chemical vapour deposition) diamond films processed with an ECR (electron cyclotron resonance) oxygen plasma are investigated. The etching rate increases linearly with increasing microwave power in the range from 100 to 300 W. For any value of microwave power, the etching rate first…
In this work, we have studied bismuth telluride (Bi2Te3) thin films on Si(100) and SiO2/Si(100) substrates grown by Hot Wall Epitaxy (HWE) technique. The morphology of the surface was controlled by Atomic Force Microscopy (AFM). Reflection and transmission experiments in the mid-infrared (MIR) spectral range were perf…
Surface phonons, electronic structure and chemical reactivity of the diamond (100)(2 ×1) surface have been studied using electron energy loss spectroscopy (EELS), thermal desorption spectroscopy (TDS) and low-energy electron diffraction (LEED). Vibrational losses are observed at ∼80, 92, 123, 135, 147 and 165 meV for…