Materials Literature
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Abstract The object of this study was the synthesis of thermoplastic elastomer compounds by direct copolyesterification of reactive oligomers of poly(ethylene terephthalate) (PET) and of poly(tetramethylene oxide) (PTMO). PET was glycolysed to synthesise hydroxytelechelic oligomers of PET. Commercially available hydro…
Abstract For Abstract see ChemInform Abstract in Full Text.
Abstract Aliphatic polyesters containing thioester linkages were enzymatically prepared by both the copolymerization of lactone with mercaptoalkanoic acid and by the transesterification of polyesters with mercaptoalkanoic acids. The enzymatic copolymerization of ε ‐caprolactone with 11‐mercaptoundecanoic acid (11MU) a…
Abstract For Abstract see ChemInform Abstract in Full Text.
Abstract For Abstract see ChemInform Abstract in Full Text.
We have performed a detailed high-resolution electron spectroscopic investigation of ${\mathrm{NiS}}_{2}$ and related Se-substituted compounds, ${\mathrm{NiS}}_{2\ensuremath{-}x}{\mathrm{Se}}_{x},$ which are known to be gapped insulators in the bulk at all temperatures. A large spectral weight at the Fermi energy of t…
Unlike the original form of SiB3, which has a huge compositional spread in its Si/B ratio and a crystal structure with Si atoms randomly distributed over all its B12 cages, the new form of SiB3 (β form; see structure) is stoichiometrically and crystallographically ordered. The clear segregation of Si and B atoms in th…
Partial discharges (PD) in a transformer generate transient UHF signals that resonate within the tank. Where more than one source of PD or interference is present, the ability to separate incoming signals depending on their point of origin would enhance the diagnostic process. A wavelet-based method for recognising UH…
Abstract The present paper discloses the changes in the nanostructure as revealed by small‐angle X‐ray scattering (SAXS) of synchrotron radiation of anisotropic semi‐crystalline samples of polyester and poly(ether ester) type differing in their chemical composition, while subjected to controlled progressive elongation…
We report the observation of a transition from the antiferroelectric B2 phase to a ferroelectric phase in a liquid crystal composed of achiral bent-core (banana-shaped) molecules. The transition is induced by an electric field of magnitude larger than the switching threshold and is not reversible, i.e., the original B…
Different ash-forming biological materials such as gills of mushrooms, cotton wool, silk fiber, spider silk, dog's hair, and human hair were examined as templates to fabricate small structures. Ashes obtained from gills of mushrooms, silk fiber, and spider silk were miniaturized replicas of the original materials, whe…
The morphology, structure, and reactivity of vanadium oxide-decorated Pd(111) surfaces, which have been subjected to oxidation and reduction treatments, have been investigated by scanning tunneling microscopy (STM), high-resolution electron energy loss spectroscopy (HREELS), and high-resolution X-ray photoelectron spe…
CaCu 2.5 Mn 4.5 O 12 perovskite has been prepared in polycrystalline form under moderate pressure conditions of 20 kbar, in the presence of KClO 4 as oxidizing agent. This material has been studied by X-ray and neutron powder diffraction (NPD), magnetic, magnetotransport, and thermopower measurements. The crystal stru…
Titandioxid/Polymer-Kapseln und hohle Titankugeln werden unter Verwendung von Gel-Templaten aus sulfoniertem Polystyrol mit Kern-Schale-Struktur hergestellt. Die Dicke der Titanschale und das Hohlraumvolumen lassen sich über den gesamten Partikelgrößenbereich steuern. Durch Anlegen eines elektrischen Feldes während de…
Order from disorder: Highly ordered nanocrystal super-lattices accommodating identical tin particles spontaneously crystallize from a dispersion displaying no order. Two structure types were identified, a noncompact one displaying uniform orientations of the particles atomic planes, and an unprecedented one containing…
Chemical vapor deposition (CVD) of single-walled carbon nanotubes (SWNTs) catalyzed using a few nm thick Ni layer supported by a thin Al underlayer is reported. Analysis by transmission electron microscopy shows the SWNTs having a diameter distribution between 1.5 and 2.8 nm. The effect of the Ni/Al bilayer film thick…
Different types of immobilized free radicals as well as immobilized paramagnetic gadolinium(III) complexes were synthesized and used as relaxation agents to shorten the spin−lattice relaxation times T 1 of analytes in quantitative continuous-flow 13 C nuclear magnetic resonance spectroscopy (NMR). The immobilized para…
During directional solidification of a binary alloy, the solid–liquid interface exhibits a variety of patterns that are due to the Mullins–Sekerka instability and governed by the growth conditions. It is well known that properties of the grown material are largely controlled by the microstructures left in the solid du…
A discrete phenomenological model of antiferroelectric liquid crystals is used to study the structures and phase transitions in bulk samples and thin films. An important ingredient of our investigations is minimization of the free energy with respect to the phase and modulus of the order parameter. A simple version of…
Abstract We have synthesized polyethoxysiloxanes starting from the AB 3 ‐type monomers triethoxysilanol and acetoxytriethoxysilane. The polymers are liquid and soluble in organic solvents. 29 Si NMR spectroscopy and MALDI‐ToF mass spectrometry analyses show that the polymers have a hyperbranched structure with additio…