Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTNanorainbows: Graded Semiconductor Films from Quantum DotsArif A. Mamedov, Artem Belov, Michael Giersig, Nataliya N. Mamedova, and Nicholas A. KotovView Author Information ChemistryDepartment, Oklahoma State University Stillwater, Oklahoma, 74078 Hahn-Meitner-Institut,…
An extensive first-principles study of fully exohydrogenated zigzag $(n,0)$ and armchair $(n,n)$ single-wall carbon nanotubes $({\mathrm{C}}_{n}{\mathrm{H}}_{n}),$ polyhedral molecules including cubane, dodecahedrane, and ${\mathrm{C}}_{60}{\mathrm{H}}_{60}$ points to crucial differences in the electronic and atomic s…
We investigate the order - disorder transition line from a Bragg glass to an amorphous vortex glass in the H-T phase diagram of three-dimensional type-II superconductors with account of both pinning-caused and thermal fluctuations of the vortex lattice. Our approach is based on the Lindemann criterion and on results o…
Soluble samples of single-wall and multiple-wall carbon nanotubes that are functionalized by lipophilic and hydrophilic dendra can be defunctionalized in homogeneous solutions under base- and acid-catalyzed hydrolysis reaction conditions. The results provide strong evidence for the ester linkages in the functionalizat…
The atomic structure of amorphous materials is believed to be well described by the continuous random network model. We present an algorithm for the generation of large, high-quality continuous random networks. The algorithm is a variation of the "sillium" approach introduced by Wooten, Winer, and Weaire. By employing…
A series of macrocyclic Eu, Gd, and Tb complexes has been prepared in which the intramolecular ligation of a beta-arylsulfonamide nitrogen is rendered pH-dependent, giving rise to changes in the hydration state, q, at the lanthanide center. In complexes based on DO3A, variation of the p-substituent in the arylsulfonam…
A diverse array of semiconductor-based composite materials have been prepared, characterized, and utilized in many applications ranging from photocatalysis, photovoltaic cells, photoelectrochromic displays, and light-emitting devices to sensors. The composite architectures (nanoarchitectures in many cases) are equally…
The electrochemically stimulated conformational relaxation model (ESCR) allows a good description of the chronoamperometric responses of polyaniline in acetonitrile solutions under relaxation control. Compaction, relaxation and diffusion controlled oxidation with penetration of counterions and increase of volume can b…
Kein Tempolimit: PAMAM-Dendrimere der sechsten Generation wurden mit bis zu 198 TEMPO-Gruppen (TEMPO=2,2,6,6-Tetramethylpiperidin-1-oxyl) funktionalisiert (siehe Bild); sie können EPR-inaktive Hydroxylamine zu EPR-aktiven Nitroxiden reoxidieren, was sie interessant für Anwendungen in der EPR-Bildgebung macht.
Polyaniline, (PANI) in the form of emeraldine base, was synthesized by polymerizing aniline in acid solutions at different sub-zero temperatures to give a range of molecular weights between 100,000 and 300,000 gmol<SUP>-1</SUP>. Molecular weights were measured using gel permeation chromatography (GPC). The polymers we…
The mesoscopic morphology of wet-spun polyaniline fibers determines their mechanical strength. Macrovoid formation in the coagulation bath is responsible for poor mechanical properties of these fibers. The effects of polymer concentration, coagulation bath temperature, polymer molecular weight and coagulant on the mor…
The electromechanical actuation performance of carbon nanotube mats, polypyrrole films and hybrid nanotube-polypryrrole materials has been compared. The hybrid materials were formed by coating nanotube mats with polypyrrole using vapour deposition and electropolymerisation techniques. When the coating time was short,…
Hyperbolic Periodic Nodal Surfaces (PNSs) have been investigated with respect to surface modulations. The resulting patterns and tilings are beautiful examples of texture information on hyperbolic objects. The construction principle, based on short Fourier series, allows for a strict symmetry control of the generated…
Spreading a hydrophobic liquid star polymer with ionic head groups and transferring the resulting monomolecular layers to solid substrates with holes provides access to ultrathin, freely suspended elastomeric membranes, which are stable for at least several months.
From magnetic circular dichroism measurements of the Heusler alloy NiMnSb, in combination with other techniques, we show that a dramatic increase in the Mn and Ni moments occurs below a ``crossover'' transition temperature of about 80--100 K. This phase transition is well below the Curie temperature of NiMnSb (\ensure…
Electrical properties of ferroelectric Bi4Ti3O12 (BiT) films on Si(100) using a 1 nm thick silicon oxynitride (SiON) buffer were investigated. The capacitance–voltage (C–V) characteristics of Au/BiT/SiON/Si(100) exhibited hysteresis loops with a memory window of 2 V due to the ferroelectricity, and did not show large…
Des Polymers Kern (wird zum Schluss entfernt): Wasserstoffbrücken-Wechselwirkungen zwischen einem Benzotri(imidazol)-Derivat und einer polymerisierbaren Alkoxybenzoesäure führen zur Bildung supramolekularer hexagonaler columnarer Flüssigkristalle. Durch lichtinduzierte Polymerisation und anschließendes Entfernen des B…
Irradiation of x-rays has induced room-temperature persistent spectral hole burning (PSHB) in Eu3+-doped borate glasses melted under an inert atmosphere. Defects were formed by x-ray irradiation and these defects, especially electron trapping centers near rare-earth ions in glasses, were responsible for the PSHB. Elec…
Abstract Static and dynamic mixers set on the Brabender plastograph were used to investigate the grafting of itaconic acid (IA) onto low‐density polyethylene (LDPE) by the reactive extrusion. The initiators of free‐radical reactions were monoperoxide 2,5‐dimethyl‐2‐hydroxy‐5‐ tert ‐butylperoxy‐3‐hexyne and diperoxide…
Thermal diffusivity (α) of amorphous silicon carbon nitride (a-SiCxNy) thin films on crystalline silicon, prepared by ion beam sputtering, has been studied using the traveling wave technique. The variation of thermal diffusivity with carbon content in amorphous silicon carbon nitride samples are reported. Thermal diff…