Materials Literature
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Multiwalled carbon nanotubes were grown vertically aligned on the iron, cobalt, and nickel catalytic nanoparticles deposited on alumina substrates by thermal chemical vapor deposition of acetylene in the temperature range 900−1000 °C. The growth rate of carbon nanotubes on the iron catalyst is about 2 times higher tha…
Polysaccharides, such as heparin, hyaluronan, and chitosan, were partially derivatized with a styryl or a methacryloyl group by condensation at a carboxyl or an amino group of the polysaccharides with 4-vinylaniline or 4-vinylbenzoic acid. The degree of substitution depended on the reaction conditions. These compounds…
Broad-band dielectric spectroscopy (10 -2 to 10 9 Hz) is applied to investigate the molecular dynamics of NaY, a zeolite of faujasite structure. A dc conductivity contribution and three relaxation processes were revealed in the dielectric spectra. The relaxation process in the high-frequency range ascribed to orientat…
We have investigated the use of supercritical fluids (SCFs) as carriers/solvents during the postsynthesis alumination of mesoporous silica. SCFs were found to be ideally suited for transport of Al into mesoporous silica and to lead to Al-grafted aluminosilicate materials that exhibit exceptional hydrothermal (steam) s…
The synthesis of a new saccharide-based gelator (2) containing a donor moiety has been described. Gelation experiments of a dual-component gel consisting of a saccharide-based gelator bearing an acceptor group (1) and of 2 have been performed in a variety of organic solvents and water. Moreover, gelation tests at diff…
Highly stable micelles with the size of 10 to 40 nm can be prepared from poly(ethylene glycol)/phosphatidyl ethanolamine (PEG−PE) conjugates. These micelles easily solubilize and firmly retain substantial quantities of various poorly soluble anticancer drugs (m-porphyrin, tamoxifen, taxol). The micelles with encapsula…
Highly oriented ZnO nanorods have been grown on various substrates, such as fused silica, Si(100), and sapphire (110), using a simple catalyst-free CVD method at low temperatures. TEM analyses indicate that epitaxial ZnO nanorods have been grown on sapphire (110) with the ZnO/sapphire orientational relationship [001]|…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNovel Multifunctional Polymers from Aromatic Diamines by Oxidative PolymerizationsXin-Gui Li, Mei-Rong Huang, Wei Duan, and Yu-Liang YangView Author Information Department of Polymer Materials Science and Engineering, State Key Laboratory of Concrete Materials Research, Coll…
[reaction: see text] A concept for modifying the photochemical properties of a dibenzobarrelene derivative by the combination of supramolecular assembly and solid-state photochemistry is presented. The irradiation of dibenzobarrelene 1b and alkali metal complexes thereof (1:1) in acetonitrile or benzene solution leads…
MgO cubes coated by graphitic carbon are formed in addition to multiwalled carbon nanotubes after reaction of Mo(CO)6 with Mg at 900 °C. The edges of these cubes are 500–600 nm in length and in some cases the MgO inside the cube can be dissolved to leave carbon cubes as the sole product. The Figure shows an area rich…
Several unsymmetrically substituted aromatic donor–acceptor disulfides have been synthesized and analysed for their second order nonlinear optical properties. These molecules exhibit moderately high first hyperpolarizability (β) with excellent transparency in the visible region. Most of the unsymmetrical disulfides ha…
Zucker-Rezeptoren: Porphyrine, die mit einem Harnstoff verknüpft sind, können Pyranoside in Chloroform besonders gut binden, sogar in Gegenwart von Hydroxygruppen enthaltenden Cosolventien. Die starre Anordnung des nichtflexiblen Porphyrin-Grundgerüsts mit den acyclischen, beweglichen, polaren und bereits vororganisie…
The selective catalytic reduction (SCR) of NO by NH3 in the presence of O2 on Cu-faujasite (Cu-FAU) has been studied. Substitution of some Cu2+ with H+ and Na+ cations, compensating for the negative charge of the zeolite framework, forms the various CuHNa-FAU studied. The amount of Cu was held constant and the proport…
The dissolution process of poly(methyl methacrylate) in mixtures of methanol and carbon tetrachloride, individually nonsolvents for the polymer (under the conditions of study), was studied at 25 °C using FTIR imaging spectroscopy. To investigate this cosolvency phenomenon, the spatial resolution and sensitivity of FTI…
The use of a crown-ether-linked merocyanine, DCM-crown, for producing photoinduced, long-lived and reversible concentration jumps of metal cations is reexamined. In this new investigation, the excited-state behavior of DCM-crown complexed with a strontium ion in acetonitrile is found to exhibit the same trends as thos…
An aqueous emulsion containing ionic Co2+ and Br- species stabilised by fluorous surfactant-like species in supercritical CO2-air mixture acts as a nano-reactor with excellent interfacial contacts of all necessary hydrophilic/hydrophobic species, which renders safe operation of catalytic aerial oxidation of toluene at…
A remarkably anisotropic structure is exhibited by [Cu26(hfac)11(1-pentynyl)15] (hfac=hexafluoroacetylacetone), the largest CuI cluster to have been isolated (see picture). A variety of copper–alkynyl bridging modes are found within the disc-shaped cluster, with all but one of the 26 Cu atoms being located in either o…
Sugar receptors: Urea-appended porphyrins were the most effective binding agent for pyranosides in chloroform and still very effective even in the presence of hydroxylic cosolvents. The combination of a rigid porphyrin skeleton and acyclic, flexible, yet preorganized polar urea groups aligned in a rigid platform (see…
The ground state electronic structure of the mixed-valence systems [Ni(2)(napy)(4)X(2)](BPh(4)) (napy=1,8-naphthyridine; X=Cl, Br, I) was studied with combined experimental (X-ray diffraction, temperature dependence of the magnetic susceptibility, and high-field EPR spectroscopy) and theoretical (DFT) methods. The zer…
Eine lamellare Hybrid-Mesostruktur mit polymerisierbaren Diacetylengruppen wird bei der In-situ-Synthese von Siliciumdioxid durch saure Hydrolyse und Kondensation von Tetraethylorthosilicat (TEOS) in Gegenwart von 1,2-Bis(10,12-tricosadiinonyl)-sn-glycero-3-phosphatidylcholin (DC8,9PC) gebildet. Diese Mesostruktur lag…