Materials Literature
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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…
Under specific experimental circumstances, sputter erosion on semiconductor materials exhibits highly ordered hexagonal dot-like nanostructures. In a recent attempt to theoretically understand this pattern forming process, Facsko et al. [Phys. Rev. B 69, 153412 (2004)] suggested a nonlocal, damped Kuramoto-Sivashinsky…
A solution-phase reaction under hydrothermal conditions at relatively low temperature is first put forward for the preparation of γ-AlOOH nanotubes and nanorods, on the basis of the possible strategy that the 2D framework structure of γ-AlOOH containing lamellae could provide orientation for the growth of 1D nanostruc…
Mechanically active cells in soft media act as force dipoles. The resulting elastic interactions are long-ranged and favor the formation of strings. We show analytically that due to screening, the effective interaction between strings decays exponentially, with a decay length determined only by geometry. Both for diso…
Abstract The chemical and conformational structures of Bombyx mori silk were studied with the complementary techniques of Fourier transform Raman spectroscopy and Fourier transform infrared spectroscopy. The Fourier transform Raman spectrum of silk showed strong bands for the photosensitive aromatic amino acids tyrosi…
In this study, we present the results of the influence of surface modification of TiO 2 nanoparticles on the short-term breakdown strength and space charge distribution of low-density polyethylene (LDPE). A polar silane coupling agent N -(2-aminoethyl) 3-aminopropyl-trimethoxysilane (AEAPS) was used for the nanopartic…
We report on the control of electric polarization (P) by using magnetic fields (B) in a hexaferrite having magnetic order above room temperature (RT). The material investigated is hexagonal Ba0.5Sr1.5Zn2Fe12O22, which is a nonferroelectric helimagnetic insulator in the zero-field ground state. By applying B, the syste…
Gold colloids with nanoparticles of different sizes were found to enhance the chemiluminescence (CL) of the luminol-H2O2 system, and the most intensive CL signals were obtained with 38-nm-diameter gold nanoparticles. UV-visible spectra, X-ray photoelectron spectra, and transmission electron microscopy studies were car…
Abstract Co‐continuous amorphous copolyester (PETG)/polyoxymethylene (POM) (50/50 wt%/wt%) blends were prepared using a twin screw extruder followed compression molding. Two types of thermoplastic polyurethane (TPU) (i.e., polyester‐based and polyether‐based) were used to compatibilize the blends system. The thermal p…