Materials Literature
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The kinetic model of the ethyl benzene oxidation was applied to the design of the large-scale reactors of p -nitroacetophenone (chloramphenicol key intermediate) synthesis by p -nitroethyl benzene oxidation and benzoic acid synthesis by acetophenone oxidation. The factors allowing simplification of the above model are…
Solid-phase synthesis of triple-helical peptides, including native collagen III sequences, was started with a trimeric branch, based upon the lysine dipeptide [Fields, C. G., Mickelson, D. J., Drake, S. L., McCarthy, J. B., and Fields, G. B. (1993) J. Biol. Chem. 268, 14153-14160]. Branch synthesis was modified, using…
We present a new method for highly spatio-resolved graft-copolymerized surface fabrication, in which the stem design (parent graft chain length) and the branch design (daughter graft chain length and degree of branching) are relatively well controlled. This is based on the photochemistry of the benzyl N,N -diethyldith…
Magnesium phthalocyanine (MgPc) is a blue pigment whose X-phase is known to exhibit an intense near-IR-absorption. Because of this, MgPc has attracted attention as a material useful for laser printers as well as optical disks based on GaAsAl laser diodes. The near-IR absorption has, therefore, been investigated from t…
Annealing of poly(ethylene- co -octene)s with 12−25 mass % 1-octene for 2.5−5250 min was carried out by approaching the annealing temperature through cooling at 10 K min -1 . Above the annealing temperature, primary crystallization was initiated. The analysis of the samples was performed during and after the annealing…
We study ballistic conductance in a three-terminal carbon nanotube system and show that conductance between two of the terminals can be controlled via the third terminal. The conductance is modulated by tuning the energy spectrum of the third terminal. Such a system may provide the core of a nanotransistor. We show mo…
Different samples of filled poly(vinyl chloride) (PVC) compositions were formulated from PVC, a polar plasticizer mixture consisting of dioctylphthalate (DOP) and a chlorinated paraffin, and variable proportions of a white filler such as barite, calcium carbonate, kaoline, quartz, or talc; a conductive filler such as…
New amorphous MnV 2 O 6+ δ · n H 2 O (0 < δ < 1) compounds have been prepared by a soft chemistry route including the precipitation of a crystallized precursor, MnV 2 O 6 ·4H 2 O, and its ozonation at temperatures below 100 °C. A combination of techniques (TGA, magnetic measurements, IR, XANES, EXAFS, XPS, and EELS) w…
The important properties of cellulosic fibers in the conditioned state are mainly influenced by fine structure. In particular, the development of new methods of spinning regenerated cellulosic fibers made from a cellulose/N-methylmorpholine-N-oxide (NMMO)/H2O system require a better understanding of their fine structu…
The reactions of I(2) with ptc and ttb (title ligands) have been investigated in CHCl(3) solution at different temperatures by spectrophotometry. A least-squares method procedure provided evidence for the formation of the 1:1 adducts. Crystals of the latter have been analyzed by X-ray diffraction methods (both monocli…
Dispersion copolymerization of styrene and a poly( N -isopropylacrylamide) macromonomer in ethanol−water media has been successfully carried out in the presence of AgNO 3 . Nearly monodisperse polystyrene microspheres with diameters ranging from 530 to 1250 nm were obtained. Nanoscopic silver particles were generated…
Three unsymmetrical tridentate pyridine-2,6-dicarboxamide binding units have been connected to the tris(2-( N -methyl)aminoethyl)amine tripod to give the podand L 10 that exists as a statistical mixture of four conformers in solution. In aqueous acidic medium, the protonated apical nitrogen atom of the tripod (p K a (…
The migration behaviors of wax to the surface in rubber vulcanizates were studied using natural (NR), styrene–butadiene (SBR), and butadiene rubber (BR) vulcanizates. The migration experiments were performed in a convection oven at 60 and 80°C for 14 days. There were less than 10% of the normal alkanes of n-C22H46 to…
The coordination number of the pore network of a mesoporous solid can be determined from its nitrogen adsorption and desorption isotherms, using an analysis method based on percolation theory. However, measurement of these isotherms is time-consuming and problematical very close to the bulk condensation pressure of ni…
A novel series of poly( N -vinyl-2-pyrrolidone)-protected nanometer-sized Cu/Pd alloy colloids have been prepared by a polyol reduction method. These colloids, having high molar fractions of Cu ( x = 0.99−0.80), show remarkable stability, as good as a Pd colloid. Transmission electron microscopy and high-resolution tr…
Pyrrole-2,4-dicarboxaldehydes 13a − c were condensed with a tripyrrane dicarboxylic acid 12 in 1% TFA−CH 2 Cl 2 to give, following oxidation with 0.1% FeCl 3, a series of “etio-type” N-confused porphyrins 14a − c . Excellent yields were obtained when the diformylpyrrole possessed a 5-alkyl substituent, although the pr…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSynthesis and Catalytic Activity of Unimolecular Dendritic Reverse Micelles with "Internal" Functional GroupsMarcelo E. Piotti, Felix Rivera,, Risha Bond, Craig J. Hawker, and Jean M. J. FréchetView Author Information IBM Almaden Research Center 650 Harry Road, San Jos…
We present semi-classical and quantized hydrodynamic models to obtain the quadratic electronic response of a plane-bounded electron gas. Explicit expressions for the dynamic image potential experienced by charged particles moving near a jellium surface are derived, up to third order in the projectile charge. These exp…
The extinction profiles as well as the hyper Rayleigh scattering signal of a highly monodisperse 22 nm diameter gold colloidal sol in the presence of pyridine have been measured. A strong enhancement of the HRS signal is observed in the presence of small amounts of pyridine. The relationship between the extinction spe…
An immunoassay readout method based on surface-enhanced Raman scattering (SERS) is described. The method exploits the SERS-derived signal from reporter molecules that are coimmobilized with biospecific species on gold colloids. This concept is demonstrated in a dualanalyte sandwich assay, in which two different antibo…