Materials Literature
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Several 4-(4'-N,N-didodecylaminophenylazo)phenyl 1,2-trans glycosides 5a-e with various carbohydrate heads (beta-D-gluco, beta-D-galacto, beta-lacto, beta-D-xylo, and alpha-D-manno) have been synthesized. The key step was the formation of phenyldiazonium tetrafluoroborates 2a-e from the per-O-acetylated 4-aminophenyl…
Abstract Five kinds of polylactides (PLAs), with different D ‐lactide contents and tacticities, were subjected to high‐speed melt‐spinning experiments. In addition to stereochemical purity, the PLA types differed in molecular mass and molecular mass distribution. The properties of the different PLA materials were char…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTEffect of Reaction Temperature on Degree of Branching in Cationic Polymerization of 3-Ethyl-3-(hydroxymethyl)oxetaneYiyong Mai, Yongfeng Zhou, Deyue Yan, and Hongwu LuView Author Information College of Chemistry and Chemical Engineering, Shanghai Jiao Tong, University, 800 Dong…
Alumina nanowire arrays standing on the surface of a porous anodic alumina membrane have been achieved by first forming a porous anodic alumina membrane with parallel Y-branched nanochannels by reducing the applied anodizing voltage by a factor of in the anodization process of high-purity Al foil, and then chemically…
In the present work the effect of spiroconjugation on the electronic spectrum of the recently synthesized metal complex hexadecaethylspirodicorrolato-dinickel(II) (5) (the corrole units in 5 are isoforms) is investigated. To have a suitable reference compound at our disposal, tetraethylhexamethylisocorrolato nickel(II…
Abstract The oxidative polymerization of aniline in formic acid (HCOOH) medium was investigated using formic acid of different strengths (5 – 25 N ). It was observed that a certain portion of the total polymer (∼ 10%) remains soluble in the reaction medium. The UV–visible absorption spectra of the reaction mixtures in…
Abstract Silicone rubber has been used as a biomaterial for more than two decades and displays good mechanical and optical properties, but its chemical nature, poor antithrombogenicity, as well as its hydrophobicity, prevents its use in many demanding biomedical applications. In order to provide modified silicone with…
To investigate the potential of di- and tri-azaheterocycles as building blocks for pi-conjugated materials with high electron affinity, linear oligomers incorporating pyrazine and a C(3)-symmetric discotic molecule based on triazine were synthesized. The tridodecyloxyphenyl end-capped ethynylene pyrazinylene oligomers…
Thin polycrystalline films are often observed to develop a preferred orientation or texture that may have significant effects on film properties, especially in the case of anisotropic crystal structures. We report on a x-ray diffraction study of texture evolution in hexagonal ZnO:Al films, which were performed with a…
Photoswitching of an intramolecular spin exchange interaction between a copper(II) ion and a nitroxyl radical by using a metal complex of diarylethene has been studied by means of ESR spectroscopy. As a coordination ligand, a diarylethene with a 1,10-phenanthroline ring and nitronyl nitroxide radical was synthesized.…
Photoinduced electron transfer in composites of CdSe and InP nanocrystals (NC) with a conjugated polymer [2-methoxy-5-(3-,7-dimethyl-octyloxy)-1, 4-phenylene vinylene] (OC1C10-PPV) is studied by means of light-induced electron spin resonance (LESR), photoluminescence (PL) as well as quasi steady-state photoinduced abs…
We present first-principles calculations for stress-induced defects in the thermoelectric material ${\mathrm{Sb}}_{2}{\mathrm{Te}}_{3}.$ We focused on the antisite defect, vacancies, and combinations thereof. Our calculated formation energies are in good agreement with experimentally obtained data. We also studied the…
Abstract The use of rigid fillers to toughen polymers has received considerable attention in recent years. The role of the rigid particle here is that of debonding, at some stage, from the matrix, thus triggering dilatational processes similar to those observed in rubber‐toughened polymers. The role of particle size i…
We report total-energy electronic-structure calculations that provide energetics and electronic structures of double-walled carbon nanotubes consisting of semiconducting (n,0) nanotubes. We find that optimum spacing between the walls of the nanotubes is slightly larger than the interlayer spacing of the graphite. We a…
A variety of polymer shells with controlled and uniform thickness are easily formed on the surfaces of silica and titania colloids by vapor deposition polymerization (VDP; see picture of silica–PMMA core–shell nanoparticles). Carbon capsules derived from polydivinylbenzene shells can be used in applications such as th…
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…