Materials Literature
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The dynamic response of a titanium carbide (TiC)–carbon steel, ceramic-metal composite, was studied in planar impact experiments, using a copper impactor with velocity in the 80–450 m/s range. The composites were prepared by pressureless infiltration of TiC ceramic preforms by molten steel. The metallic component had…
The synthesis and characterization of a new constrained tetraazamacrocyclic ligand, 1,4,8,11-tetraazabicyclo[9.3.3]heptadecane (1,11-C(3)-cyclam), is reported. Because of its basicity, this ligand (pK(a) of the protonated form >13.5) requires aprotic solvents for its metalation reactions. Two complexes of this ligand,…
Crystal growth and optical properties of Cr4+ centers in Li2TiGeO5 single crystals were investigated. Polarized absorption spectra at low and room temperature indicate a lowering of symmetry of the local environment of the Cr4+ ion from Td to C2 group of symmetry. The crystal field parameter Dq and the Racah papramete…
Abstract Three series of weakly crosslinked polyurethanes based on a hydroxyterminated polybutadiene, hydroxyterminated butadiene–acrylonitrile copolymer, and hydroxyterminated ethylene–adipate–maleate–fumarate copolymer were prepared while varying the hard segment content between 1.72 and 2.36 mol NHCOO/1000 g pol…
The cation-exchange capacities for the alkaline earth metals Ba, Mg, and Ca, and their immobilization in the interlayers of a novel swelling fluorine mica (Na-3-mica) with a high-layer-charge density were studied. The mica was fully exchanged or saturated with Ba, Mg, and Ca ions and the cation-exchange capacities wer…
We have analytically evaluated a quantum correction to the classical Boltzmann conductivity in a single graphene sheet. The effective-mass theory is applied to electronic states and we have collected contributions represented by maximally-crossed diagrams in perturbative expansions of the conductivity by Kubo formula.…
Liquid chromatography in combination with spectroscopic methods like matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOFMS) or nuclear magnetic resonance (NMR) spectroscopy is a powerful method to characterize silsesquioxanes and silsesquioxane mixtures. As new examples, the formati…
Azobenzene-modified poly(l-glutamic acid) (AZOPLGA) polymers with 22 and 35 mol % of azo chromophores in the side chains have been synthesized by condensing 4-methoxy-4'-aminoazobenzene and poly(l-glutamic acid). These polymers have been characterized by NMR, FT-IR, and UV-visible spectroscopic techniques. The conform…
A new Schiff base complex of the composition [Dy(C8H8NO3)(NO3)(H2O)]NO3·H2O (C8H8NO3 = furfurylidenealanine) has been synthesized and characterized by elemental analyses, IR, UV and molar conductance. The thermodecomposition kinetics of the complex were investigated under non‐isothermal condition. TG and DTG curves in…
The effect of pH on the bubble size distribution, void fraction, and enrichment ratio of a continuous foam fractionation column containing ovalbumin was investigated. The bubble size and void fraction were measured using a photoelectric capillary probe for different solution pHs (3.5, 4.5, 6.5, and 9.7). The bubble di…
Si nanoclusters have been formed by 5 keV Si+ implantation at a fluence of 1×1016 atoms/cm2 into a 200 Å thin thermally grown SiO2 film on Si (100), followed by thermal treatment at 1000 °C with different annealing times. All the annealed samples show a broad photoluminescence spectrum with increasing intensity as fun…
We have examined the effect of addition of saturated straight-chain alkanes, C n ( n even and n = 8−16), and the aromatics toluene and benzene on the formation of mesoporous silicate films, which form at the air−water interface. The silicate films self-assemble by slowly condensing silicate oligomers attaching to temp…
Amorphous carbon thin films containing 0–50 at. % Cu have been grown by mass selected ion beam deposition in order to synthesize isolated Cu nanoparticles within a diamond-like matrix. Raman spectroscopy and x-ray photoelectron spectroscopy show that the sp3 content of the matrix decreases with increasing Cu content.…
Isothermal kinetic experiments were carried out with isotopically-labeled molecular beams in order to characterize the surface reactions involved in the reduction of nitrogen monoxide with carbon monoxide on Rh(111) single-crystal surfaces. The new data reported here offers support for the basic model advanced previou…
The construction of chirally twisted porphyrin-based molecular capsule 6 and polymeric capsule 8 was investigated by means of scanning electron microscopy (SEM) and (1)H NMR, UV-visible, and CD spectroscopic observations. Molecular capsule 6 and polymeric capsule 8 were constructed by the reaction of chiral cis-Pd(II)…
A low-k dielectric barrier based on silicon oxycarbide for copper damascene processes has been developed in this work. The optimal process conditions that allow the deposition of silicon oxycarbide films with a dielectric constant of 3.74 and copper diffusion depth of 290 Å after thermal stress at 400 °C for 3 h has b…
A self-organized dynamic growth process (“morphosynthesis”) involving mineral formation at a membrane-type surface leads to discrete inorganic shells of star-shape morphology (see picture). CTAB=cetyltrimethylammonium bromide.
Ein Vanadium-substituiertes Polyoxomolybdat-Ion ([PV2Mo10O40]5−, oben rechts) aktiviert Distickstoffmonoxid und erleichtert dadurch die hoch selektive katalytische Oxidation von primären und sekundären Alkoholen zu Aldehyden bzw. Ketonen sowie die Oxidation einer Reihe von Alkylaren-Substraten (siehe Schema).
Epitaxial SrRuO3 thin films on (001) SrTiO3 substrates grown by pulsed laser ablation at deposition temperatures ranging between 690° and 810 °C have been examined. The correlations between dc and microwave resistivity, microstructure, and surface morphology are obtained. According to the x-ray measurements the struct…
The system poly-γ-benzyl-l-glutamate—dimethylformamide (PBG/DMF) is the most-studied of the rodlike polymer-solvent systems. However, up to now there is no satisfactory experimental phase diagram (PD) for this system in the entire range of concentrations. For all studied systems only fragments of the PD are known. Som…