Materials Literature
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Gels comprised of low-molecular-mass organic gelators (LMOGs), N-alkyl perfluoroalkanamides [F(CF2)(m)CONH(CH2)(n)H; FmNHn], and several perfluorinated liquids are described. The gelation ability of the amides has been compared to that of two analogous alkyl perfluoroalkanoates. The properties of these gels have been…
We numerically demonstrate that a planar waveguide in which the inner layer is a gas with refractive index n0 = 1, sandwiched between two identical semi-infinite layers of a negative index material, can support both transverse electric and transverse magnetic guided modes with low losses. Recent developments in the de…
A computational study of ethane oxidative dehydrogenation to ethylene on Pt- and Pt/Sn-coated monoliths is presented as an improvement to previous kinetic models in reproducing experimental findings over a wide range of feed conditions. The multistep surface mechanism containing 20 reversible reactions among 11 surfac…
We have recently fabricated Keggin-type polyoxometalate (H 4 SiW 12 O 40 ) nanotubes by calcining layer-by-layer (LBL) structured ultrathin hybrid film coated electrospun fibrous mats. The hybrid film coated electrospun fibrous mats were obtained from the alternate deposition of positively charged poly(allylamine hydr…
Using a laser monitoring observation technique, the solubilities of 7-aminocephalosporanic acid (7-ACA) in binary acetone + water solvent mixtures were determined from 274.45 to 301.15 K, which are the important data for the operation of the crystallization process of 7-ACA from its aqueous solution. The experimental…
We report the unusually low swelling capacity of highly stretched polystyrene chains grown on a silicon surface using “living” free radical polymerization. The control over the lateral density leads to brushes with a very high grafting density (up to >1.0 chain/nm 2 ). Neutron reflectivity measurements have evidenced…
Wurtzite ZnS nanowires were produced by a vapour–liquid–solid process. The growth mechanism of the ZnS nanowires was studied by scanning electron microscopic observations at different stages of the nanowire growth. The produced nanowires were characterized by x-ray diffraction, scanning and transmission electron micro…
Nanostructured silica based ceramic samples of composition (100− x )SiO 2 – x SnO 2 , doped with 0.4 mol% of Eu 3+ and with x from 1 to 10, have been developed after a thermal treatment of precursor sol–gel glasses. A structural analysis has been performed by x-ray diffraction and high resolution transmission electron…
An iterative physically bounded Gauss−Newton (PGN) method has been formulated to estimate unknown kinetic parameters from experimental measurements. A physically bounded approach is adopted to reduce the size of the search space and ensure search within physically meaningful ranges of kinetic rates. First-order sensit…
The statistical variations in the properties of carbon nanotubes and their contacts to metallic electrodes can be averaged by using networks of single-walled carbon nanotubes as sensing devices. Carbon nanotube networks have been assembled on microstructures with dielectrophoresis, using an inhomogeneous alternating e…
We have investigated atomic and electronic structures of hydrogen-chemisorbed single-walled carbon nanotubes (SWCNTs) by density functional calculations. We have searched for relative stability of various hydrogen adsorption geometries with coverage. The hydrogenated SWCNTs are stable with coverage of H/C, theta >/= 0…
A strategy for the rapid, material-efficient development of crystallization processes centred around the use of process analytical technology (PAT) is presented and demonstrated on an active pharmaceutical ingredient (API) currently in development at Pfizer's Sandwich laboratories. PAT is implemented at scales as smal…
ZnO nanowires were synthesized by chemical vapour deposition (CVD). The dc electrical conductivity of a single ZnO nanowire was investigated over a wide temperature range from 300 to 6 K. It is found that the temperature dependence of conductivity follows the relation . The conductivity data suggest that the dominant…
Gold nanoparticles (NPs) have been prepared with three different capping systems: a tetralkylammonium salt, an alkanethiol, and a thiol-derivatized neoglycoconjugate. Also gold NPs supported on a porous TiO(2) substrate have been investigated. X-ray absorption spectroscopy (XAS) has been used to determine the electron…
[Ru(IV)(2,6-Cl2tpp)Cl2], prepared in 90 % yield from the reaction of [Ru(VI)(2,6-Cl2tpp)O2] with Me3SiCl and structurally characterized by X-ray crystallography, is markedly superior to [Ru(IV)(tmp)Cl2], [Ru(IV)(ttp)Cl2], and [Ru(II)(por)(CO)] (por=2,6-Cl2tpp, F20-tpp, F28-tpp) as a catalyst for alkene epoxidation wit…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTNanoporous Polystyrene by Chemical Etching of Poly(ethylene oxide) from Ordered Block CopolymersHuiming Mao and Marc A. HillmyerView Author Information Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455-0431 Cite this: Macromolecules 2005, 38, 9, 403…
Aniline, which causes serious environmental problems, was electrochemically treated and thereby removed from aqueous solution. This method demonstrated herein is based on the formation of polyaniline at an electrode surface by electrochemical oxidation. Initially, the electrode behavior of aniline at several condition…
Abstract Copolymerization of a novel monomer cinnamoyloxyethyl methacrylate (CEMA) with isooctyl acrylate (IOA) was performed in the range 10–90 % of the feedstock. Copolymer compositions were determined from proton nuclear magnetic resonance spectroscopy. Monomer reactivity ratios were calculated using Fineman–Ross a…
Tiopronin-coated silver particles (average diameters of core = 1.6 nm) were prepared by a modified Brust method, and the ligands on the metal core were partially displaced by (2-mercapto-propionylamino) acetic acid-2,5-dioxo-pyrrolidin-1-ylester through ligand exchanges. The particles were bound on amine-pendent polym…
HiPco single-wall carbon nanotubes (SWNTs) have been noncovalently modified with ionic pyrene and naphthalene derivatives to prepare water-soluble SWNT polyelectrolytes (SWNT-PEs), which are analogous to polyanions and polycations. The modified nanotubes have been characterized with UV-vis-NIR, fluorescence, Raman and…