Materials Literature
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The hydrolysis of sodium tetrahydroborate is a promising way for generating hydrogen. The key element of this process is the catalyst. The present study reports the performances of Pt-based catalysts (supported over various metal oxides like TiO2 or ZrO2, with different Pt loadings, or doped with metal-‘impurities’ li…
In epitaxial films, large elastic strain originating from the lattice misfit with the substrate remains, and it could affect the elastic stiffness. However, we found that epitaxially grown Cu thin films on (001) Si show exceptionally stable stiffness: the average out-of-plane elastic constant throughout the film thick…
Vesicles bearing either cationic (amino) groups or zwitterionic (amino acid) groups on the surface were coated with a reactive multivalent hydrophilic N-(2-hydroxypropyl)methacrylamide polymer (PHPMA) and its positively charged analogue (3 mol % quaternary ammonium groups), both having reactive thiazolidine-2-thione (…
The dynamics of homogenous polychlorinated biphenyl (PCB54)/toluene mixtures have been investigated by means of broadband dielectric spectroscopy. The mixture presents dynamical heterogeneity, alike miscible polymer blends, which is manifested with the presence of two relaxational processes. The relatively slow one ha…
La 0.9 K 0.1 CoO 3 perovskite type oxide fibers have been prepared by a sol−gel process combined with electrospinning procedure. The reactions during the calcination process of fibers have been tracked and characterized by TG, IR, and XRD. The prepared La 0.9 K 0.1 CoO 3 fibers are composed of nanoparticles and the BE…
Pressure-induced successive phase transitions of micro-, submicro-, and nanocrystalline NaNbO 3 particles were investigated by high-pressure Raman spectroscopy. Microcrystalline NaNbO 3, which stabilizes in an orthorhombic Pbcm structure at ambient pressure, showed bulk-like successive transitions at around 2, 6, and…
Jahn, R. & Kusber, W.-H.: Algae of the Ehrenberg collection — 1. Typification of 32 names of diatom taxa described by C. G. Ehrenberg. — Willdenowia 34: 577–595. — ISSN 0511-9618; © 2004 BGBM Berlin-Dahlem.The present paper is the first in a series of papers typifying names of algae taxa, which Ehrenberg described as…
Abstract Polystyrenes (PS's) with different molecular weights were chemically modified with maleic anhydride (MA) with of benzoyl peroxide as an initiator or with a cationic catalyst such as FeCl 3 in chloroform. The effect of the solvents (i.e.; chloroform, benzene, toluene, xylene, and tetrahydrofuran), PS and MA co…
Abstract Diamond semiconductor possesses exceptional physical properties, such as high thermal conductivity, high breakdown field, and high mobility, and is therefore expected to offer the highest performance among semiconductors as high‐frequency, high‐power transistors. At present the most critical issue in achievin…
Abstract Effects of thermal stability of surfactants with amino and imido groups on thermal properties of poly(ethylene terephthalate) (PET)/clay composites were studied. The imidosilane surfactant was synthesized successfully from the imide reaction between amino silane and phthalic anhydride. TGA shows that imidosil…
In this study, the adsorption of a single Cu atom on the polar ZnO(0001) and ZnO(0001) surfaces was investigated by means of highly accurate wave function based ab initio methods. Different modifications of the polar surfaces were investigated: unstabilized surfaces, surfaces with hydrogen and OH overlayers, and defec…
The effect of deposition parameters, i.e. type of substrate (microscope glass, quartz and mica) and thickness (500 nm, 800 nm and 1100 nm), on the optical properties of Ge10Se90− x Te x (x = 0, 10, 20, 30, 40, 50) thin films was investigated. Thin films were deposited by the vacuum evaporation technique at a base pres…
Coordination multilayers consisting of Pd(II) pincer-type complexes and poly(vinyl pyridine) were synthesized and characterized. Film properties were found to be dependent on and could be tuned by varying bath deposition concentrations, polymer molecular weight, and solution additives that compete with binding. Genera…
Electronic structure calculations based on density functional theory have been applied to clusters of titanium with different alloying elements in order to obtain quantum parameters that give some information on the interaction between the mother and alloying atoms. Average values of these parameters weighted with the…
Schrittweise: Fünfkernige Cluster (siehe Bild) wurden als Baueinheiten für den Aufbau dreidimensionaler, diamantartiger Netzwerke synthetisiert. Die ESI-Massenspektren dieser Cluster belegen, dass die fünfkernigen Einheiten ihre strukturelle Integrität behalten bevor sie die Netzwerke bilden, was eine erfolgreiche sch…
Ein cyclisches Tetramer des Dialkinylen-verbrückten Zink-Bisporphyrin-Rotamers [ZnP()2] zeigt eine einzigartige solvatochrome Reaktion auf unpolare Lösungsmittel mit niedrigen Dielektrizitätskonstanten (2.23–2.57). Diese Solvatochromie rührt von der π-Konjugation von [ZnP()2] her. Das Tetramer [{ZnP()2}4] ermöglich…
Interactions between glassy polymer chains and the uniformly dispersed carbon nanotubes (CNTs) in nanocomposites were investigated with surface-grafted multiwalled CNTs dispersed in two model polymer systems, polystyrene (PS) and poly(phenylene oxide) (PPO), representing respectively brittle and ductile polymers. Alth…
Characterization of interfacial materials isolated from water-in-crude oil emulsions is a useful tool to reveal the emulsion stability mechanisms. “Heavy water (D 2 O) method” is a technique used successfully in the past to isolate the interfacial organics from laboratory-made emulsions containing D 2 O droplets. Howe…
Abstract BACKGROUND: While carbon nanotubes are highly interesting materials for a variety of applications, their inherent insolubility limits widespread applications and solution‐phase processing. It is known that chemical functionalization can overcome this insolubility problem, and covalent grafting of polymers to…
Abstract Rigid polyurethane foams (RPUFs) have been fabricated from crude MDI (CMDI) and polypropylene glycols (PPGs) of various functionalities ( f ) with HFC 365mfc as a blowing agent. Foam density increased, cell size and density distribution decreased with increasing f while the closed cell content was kept consta…