Materials Literature
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A method for coating silica on CoFe 2 O 4 and MnFe 2 O 4 spinel ferrite nanoparticles has been developed by using a reverse micelle microemulsion approach. The ability to controllably synthesize magnetic nanoparticulate cores independent of encapsulation provides great flexibility in tuning the magnetic properties of…
We report a systematic evaluation of the use of refluxing nitric acid as a purification treatment for electric arc-produced single-walled carbon nanotubes (SWNTs), by using a combination of thermogravimetric analysis (TGA) and near-infrared (NIR) spectroscopy. Nitric acid is the standard reagent for purification of SW…
Abstract The electronic structure of the cubic perovskites SrTiO 3 , BaTiO 3 , PbTiO 3 , and LaMnO 3 is calculated by Hartree–Fock and density functional theory methods in the approximation of linear combinations of atomic orbitals. The local properties of the electronic structure of these crystals (atomic charges, bo…
We present extensive molecular dynamics simulation results for self-diffusion and viscosity for isoparaffins between C 6 and C 16 and examine the ability of several forms of Stokes−Einstein relationships to link the transport properties in a coherent framework. Based on a hydrodynamic model for drag past prolate ellip…
The outermost atomic layer of perfluorinated thiol monolayers on gold and poly(tetrafluoroethylene) (PTFE) is analyzed by low-energy ion scattering. Absolute quantification of fluorine density in this layer was achieved after calibrating the fluorine signal with a freshly cleaved LiF(100) single crystal. The fluorine…
Abstract Graft copolymerization of methyl methacrylate onto starch was carried out in aqueous medium using Ce(IV)–glucose initiator in the temperature range 40–60°C. Effects of concentration of Ce(IV), glucose, H 2 SO 4 , monomer, and starch on grafting were investigated. Percentages of grafting were evaluated and com…
The high-yield convergent synthesis of dendrons, dendrimers, and dendritic-linear hybrid macromolecules composed of succinic acid, glycerol, and poly(ethylene glycol) (PEG) is described. This convergent synthesis relies on two orthogonal protecting groups; namely, the benzylidene acetal (bzld) for the protection of th…
Bridging nerve gaps by means of autologous nerve grafts involves donor nerve graft harvesting. Recent studies have focused on the use of alternative methods, and one of these is the use of biodegradable nerve guides. After serving their function, nerve guides should degrade to avoid a chronic foreign body reaction. Th…
Abstract The synthesis of new chitosan derivatives and their complete characterization by elemental analysis, Fourier transform infrared, thermogravimetric analysis, and cross‐polarity/magic‐angle‐spinning 13 C NMR is described. A chitosan that was 96.5% deacetylated and had a viscosimetric molecular weight of 131,000…
Silver nanowires are prepared by electroplating into an anodic aluminium oxide (AAO) template. After the AAO template was removed by chemical etching, the surface of Ag nanowires was further modified by pulse DC electroplating. Various Ag nanobranches are grown on the surface of the Ag nanowire. This study discusses t…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTNoncentrosymmetric Structure from a Tetrablock Quarterpolymer of the ABCA TypeA. Takano, K. Soga, J. Suzuki, and Y. MatsushitaView Author Information Department of Applied Chemistry, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 4…
Surface phases of ${\mathrm{Cr}}_{2}{\mathrm{O}}_{3}(0001)$ as a function of ambient oxygen pressure and temperature were computed by ab initio density-functional theory for a solid surface. The surface can be $(1\ifmmode\times\else\texttimes\fi{}1)$ or $(\sqrt{3}\ifmmode\times\else\texttimes\fi{}\sqrt{3})$ Cr termina…
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…