Materials Literature
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Faserstrukturen aus selbstorganisierten Polyelektrolyt-β-Faltblatt-Komplexen (siehe Bild) bilden sich spontan, wenn Lösungen komplementärer kationischer und anionischer Oligopeptide gemischt werden. Makroskopisch verhalten sich diese Lösungen wie nematische Nanogele, die auf Änderungen von pH-Wert oder Peptidkonzentra…
A uniform alignment of liquid crystal (LC) with finite pretilt was observed on microtextured substrates that were lithographically fabricated with alternating horizontal and vertical corrugations. As the period of alternation was decreased toward 0.8 microm, the nematic LC alignment on these substrates changed from in…
Four new chiral bis(amino alcohol)oxalamides (1-4: amino alcohol=leucinol, valinol, phenylglycinol, and phenylalaninol, respectively) have been prepared as low-molecular-weight organic gelators. Their gelation properties towards various organic solvents and mixtures were determined and these were then compared to rela…
Fibrillar networks built up from polyelectrolyte β-sheet complexes (see picture) are formed by spontaneous self-assembly when solutions of appropriately designed cationic and anionic oligopeptides are mixed. At the macroscopic level the resulting solutions are nematic hydrogels, which are quite robust to variations in…
Electrically conducting nanoparticle nanotubes (NPNTs) with a high surface area are obtained by a novel procedure. The assembly of gold nanoparticles on the pore walls of surface-modified nanoporous alumina membrane templates under flow conditions is accompanied by spontaneous room-temperature coalescence of the bound…
Abstract Composites based on natural rubber (NR) and containing organophilic and pristine layered silicates of natural and synthetic origin were produced by melt compounding and sulfur curing. The curing, thermomechanical, and mechanical properties of the mixes, which contained 10 phr (parts per hundred parts of rubbe…
We present domain-specific magnetization reversals extracted from soft x-ray resonant magnetic scattering measurement on a permalloy square ring array. The extracted domain-specific hysteresis loops reveal that the magnetization of the domain parallel to the field is strongly pinned, while those of other domains rotat…
The magnetoresistivity and critical current density of well characterized Si-nanoparticle doped and undoped Cu-sheathed MgB$_{2}$ tapes have been measured at temperatures $T\geq 28$ K in magnetic fields $B\leq 0.9$ T. The irreversibility line $B_{irr}(T)$ for doped tape shows a stepwise variation with a kink around 0.…
We present the first ab initio study of the geometry, electronic structure, charged states, bonding and vibrational modes of the recently synthesized fullerene-like As@Ni12@As20 cluster which has icosahedral point symmetry [Science, 300, 778 (2003)]. We show that the molecule is vibrationally stable and will be electr…
Using a scanning tunnel microscope or mechanically controlled break junctions, atomic contacts of Au, Pt and Ir are pulled to form chains of atoms. We have recorded traces of conductance during the pulling process and averaged these for a large amount of contacts. An oscillatory evolution of conductance is observed du…
The electric properties, for example, ζ potential and surface charge, of a solid in contact with an aqueous solution play an important role in various interfacial and colloidal phenomena, as well as in adsorption and filtration processes. In this study, the ζ potentials of chloride-doped polypyrrole (PPyCl) particles…
Various low-dimensional nanostructures, such as nanowires, nanotubes, nanosheets, and fullerene-like nanoparticles have been selectively synthesized from rare-earth compounds (hydroxides, fluorides) based on a facile hydrothermal method. The subsequent dehydration, sulfidation, and fluoridation processes lead to the f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUpconversion and Anti-Stokes Processes with f and d Ions in SolidsFrançois AuzelView Author Information GOTR, UMR 7574-CNRS, 1, Place A-Briand, 92195 Meudon Cedex, France Cite this: Chem. Rev. 2004, 104, 1, 139–174Publication Date (Web):November 18, 2003Publication History R…
Abstract Reactive processing of blends of poly(butylene terephthalate) (PBT) with the ethene–(methyl acrylate)–(glycidyl methacrylate) terpolymer (E–MA–GMA) is known to present a very complex reactivity since two competitive reactions take place spontaneously during melt blending, that is, blend compatibilization and…
Abstract Compatibilization of polymer blends of high‐impact polystyrene (HIPS) and high‐density polyethylene (HDPE) blend by styrene/ethylene–butylene/styrene (SEBS) was elucidated. Polymer blends containing many ratios of HIPS and HDPE with various concentrations of SEBS were prepared. The Izod impact strength and el…
Abstract This article describes a strategy to fabricate a conducting polymer and complementary gold microstructures through selective electrodeposition and wet chemical etching on a chemically tethered polymer brush template that is prepared by surface‐initiated atomic transfer radical polymerization (ATRP) and subseq…
Abstract A phosphazene derivative, hexa‐allylamino‐cyclotriphosphazene (HACTP), was synthesized through the aminolysis of hexa‐chloro‐cyclo‐triphosphazene with excess allylamine. HACTP is a soluble light‐brown crystalline solid, which melts at 90°C. It was reactive after melt but decomposed at 236°C. When it was incor…
Abstract Three kinds of epoxy‐based transparent nanocomposites were prepared by the reaction of alkylammonium‐exchanged montmorillonite (AMT) with diglycidyl ether of bisphenol A (DGEBA) and triethylamine as the curing agent. The morphology of these composites was characterized by X‐ray diffraction, scanning electron…
Nanowire networks of trigonal selenium (see Figure) have been prepared over a large area through a spontaneous organization process. This has been realized via the vapor deposition of selenium and subsequent crystallization. The network of selenium nanowires is expected to find applications in nanoscale circuits as we…
Abstract A novel method for fabrication of highly oriented polyaniline (PANI) nanowires without removal of the template was developed by combining self‐assembly and template synthesis techniques. By using a self‐assembly process under inhibition conditions, oriented arrays of PANI nanowires growing out of the nanoporo…