Materials Literature
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Fehler im System, nämlich Sauerstoffvakanzen in ZnO, wirken als aktive Zentren in der Hydrierung von CO zu Methanol. Nanokristallines ZnO mit hoher Sauerstoffleerstellendichte wurde aus metallorganischen Zn4O4-Vorstufen präpariert und auf seine katalytischen Eigenschaften in der Methanolsynthese untersucht.
Abstract We report the first measurements of the effect of ammonia gas on the temperature dependence of the conductivity and thermoelectric power of polypyrrole films. Our data are for samples of very different conductivities, extending down to a temperature of 200 K for low‐conductivity polypyrrole gas sensors, and d…
Porous polyethylene oxide-b-polyfluorooctylmethacrylate (PEO-b-PFOMA) diblock copolymer films were drop cast onto substrates from Freon (1,1,2-trichlorotrifluoroethane) in a humid atmosphere. The pores in the films exhibit long range hexagonal order in some cases, depending on the PFOMA-to-PEO molecular weight ratio.…
This paper reports the first synthesis of A 2 + B 3 highly branched polyesters with the minimal formation of cyclics in the absence of a polymerization solvent. Highly branched poly(ether ester)s were synthesized in the melt phase using an oligomeric A 2 + B 3 polymerization strategy. Condensation of poly(propylene gl…
The structural arrangements and magnetic properties of iron encapsulated in single wall carbon nanotubes (SWCNT) are investigated. Fe nanowires are of interest because of their potential use in spintronics. They have also been fabricated inside carbon nanotubes, where occasionally exchange bias has also been detected.…
Calculations within the mode-coupling theory of the glass transition (MCT) are used to elucidate the structure-dynamics relation in sodium-silicate melts (NS x ) of varying sodium concentration. Using only the partial static structure factors from molecular-dynamics (MD) computer simulation as input, MCT qualitatively…
Abstract Nonexchangeable K + constitutes a slowly available reserve that may significantly influence K + fertility of soils. Laboratory and greenhouse experiments were conducted to characterize the K + supply and nonexchangeable K + –release kinetics in 10 calcareous soils using 0.01 M CaCl 2 and 0.01 M oxalic acid ex…
Glucose is a central molecule in biology and chemistry, and the anomerization reaction has been studied for more than 150 years. Transition-state structure is the last impediment to an in-depth understanding of its solution chemistry. We have measured kinetic isotope effects on the rate constants for approach of alpha…
The perovskite polymorph of YbMnO 3 has been revisited. The orthorhombic phase is obtained through a high-pressure (HP) reconstructive transformation from the hexagonal sol−gel-synthesized YbMnO 3 by means of HP annealing at 5 GPa and 1100 °C. Neutron powder diffraction shows that the HP form crystallizes in the ortho…
Hyperbranched glycopolymers were grafted from a silicon wafer with a covalently attached initiator layer of α-bromoester fragments using self-condensing vinyl copolymerization (SCVCP) of the methacrylic AB* inimer, 2-(2-bromoisobutyryloxy)ethyl methacrylate (BIEM), and a sugar-carrying methacrylate, 3- O -methacryloyl…
The large scale formation of uniform Sb 2 S 3 nanorod-bundles has been achieved via a simple and mild hydrothermal approach with the assistance of polyvinylpyrrolidone. By closely inspecting the growth process and the crystallographic analysis of as-synthesized products, conclusive evidence has been provided to show t…
The photostability of thiol-capped CdTe quantum dots (QDs) in Euglena gracilis (EG 277) and human embryonic kidney (HEK 293) cells was studied. The photobleaching for the cellular QDs is dependent both on the irradiation power density and the QD local concentration. The photostability of cellular QDs is better than th…
A series of heteroleptic bis(phthalocyaninato) europium(III) complexes, namely, Eu(Pc)[Pc(15C5)] (2), Eu(Pc)[Pc(opp-15C5)2] (3), Eu(Pc)[Pc(adj-15C5)2] (4), Eu(Pc)[Pc(15C5)3] (5), and Eu(Pc)[Pc(15C5)4] (6) [Pc = unsubstituted phthalocyaninate; Pc(15C5) = 2,3-(15-crown-5)phthalocyaninate; Pc(opp-15C5)2 = 2,3,16,17-bis(1…
Gold or Silver nanoparticles have been immobilized on the surface of poly(4-vinylpyridine) fibers and poly(4-vinylpyridine)/poly(methyl methacrylate) composite fibers by in situ synthesis or by self-assembly. Polymer fibers with submicrometer diameters were fabricated using an electrospinning process and modified to i…
Here we demonstrate, for the first time, that it is possible to synthesize a polymer that exhibits no orientational birefringence and no photoelastic birefringence using two methods. In these methods, the contributions of monomers and an anisotropic dopant to orientational birefringence and photoelastic birefringence…
With such a wide diversity of properties and applications, is it any wonder that industry and academia have such a fascination with polymers? A solid introduction to such an enormous and important field is critical to the modern polymer scientist-to-be, but most of the available books do not stress practical problem s…
A photochromic symmetric Schiff base, N,N'-bis(salicylidene)-p-phenylenediamine, is proposed as a probe for the study of solvent dependent enol-keto tautomerism in the ground and excited states. The ground state equilibrium between the enol-keto tautomers is found to depend mainly not on polarity but on the proton don…
Abstract Quantitative temperature‐modulated differential scanning calorimetry (TMDSC) and superfast thin‐film chip calorimetry (SFCC) are applied to poly(butylene terephthalate)s (PBT) of different thermal histories. The data are compared with those of earlier measured heat capacities of semicrystalline PBT by adiabat…
Using the full potential linearized augmented plane wave (FLAPW) method, we have explored the magnetic properties of one dimensional (1D) Ti atomic chain. Astonishingly, we for the first time observed that the 1D Ti atomic chain has ferromagnetic ground state even on NiAl(110) surface although the Ti has no magnetic m…
Recent claims of an experimental demonstration of spontaneous spin polarisation in dilute electron gases \cite{young99} revived long standing theoretical discussions \cite{ceper99,bloch}. In two dimensions, the stabilisation of a ferromagnetic fluid might be hindered by the occurrence of the metal-insulator transition…