Materials Literature
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The crystal structure and the morphology of poly(ethylene oxide) (PEO)−2-methyl resorcinol (MRES) supramolecular complexes are investigated by differential scanning calorimetry and wide-angle and small-angle X-ray scattering. Depending on the MRES content, two molecular complexes with different stoichiometries are obs…
Polypyrrole (PPY) films with a thickness of 3–4 μm were obtained by chemical oxidation of pyrrole (PY) at the interface of chloroform and water with an oxidant (NH4)2S2O8. The films were compact and could be removed with a solid plate. The quality and compositions of these films varied with the molar ratios of the mon…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOptoelectronic Properties and Memories Based on Organic Single-Crystal Thin FilmsChong-yang Liu and Allen J. BardView Author Information Department of Chemistry and Biochemistry, The University of Texas at Austin, Austin, Texas 78712 Cite this: Acc. Chem. Res. 1999, 32, 3, 2…
Agrowastes and woodflour are a potential and attractive alternative of cheap reinforcement for brittle polymeric materials because they can reduce costs and, at the same time, improve certain properties. On the other hand, their high moisture sorption and low microbial resistance are disadvantages that need to be cons…
Phase-separated blend films were prepared with the solution casting method from poly(L-lactide) (PLLA) and poly(ε-caprolactone) (PCL) with different PLLA contents [XPLLA (w/w) = PLLA/(PCL + PLLA)] and their biodegradation was investigated in soil up to 20 months by gravimetry, gel permeation chromatography, tensile te…
The kinetics of oxygen chemisorption on resin chars were investigated in this study. The Elovich equation was employed to facilitate the interpretation of the chemisorption process. It was found that the activation energy for chemisorption is not constant and varies with surface coverage. This observation can be expla…
Chromophores with optimized second-order optical nonlinearity to optical loss ratios are synthesized, poled with an electrical field, and coupled into hardened polymer matrixes. Acentric order, which is necessary for electro-optic activity, is optimized by the consideration of chromophore−chromophore electrostatic int…
This article reviews recent developments in multiresolution analysis which make it a powerful tool for the systematic treatment of the multiple length-scales inherent in the electronic structure of matter. Although the article focuses on electronic structure, the advances described are useful for non-linear problems i…
Polyethylene thin films are simulated on a high coordination lattice, which is formed by connecting every other site on a diamond lattice. The films present two surfaces to vacuum at 509 K. Each film contains 36 linear or cyclic chains of 50 beads on the coarse-grained lattice, where each bead represents two united-at…
Reactions of H 2 O 2 with Cp*MoCl 4 and Cp*WCl 4 (Cp* = C 5 Me 5 ) yield chloro oxo−peroxo complexes of the type Cp*MoO(O 2 )Cl ( 1 ) and Cp*WO(O 2 )Cl ( 2 ) in high yields. The compounds have been characterized using X-ray structural analysis.
The laser photolysis of gold Au III salts embedded in micelle cores of block copolymer micelles derived from polystyrene−poly-4-vinylpyridine was studied. Two types of polystyrene−poly-4-vinylpyridines having different block length have been employed, producing micelles with different properties. The influence of the…
For powder diffraction, high resolution can be best achieved using the parallel beam geometry with a monochromator/analyzer combination. However experiments are long and a way to reduce this time without compromising resolution is to use several analyzer/ detector combinations mounted on a single (theta) <SUB>a</SUB>/…
In this work we employed the layer-by-layer adsorption technique for deposition on solid substrates of polyionic films containing photoactive azobenzene groups. We investigated two systems, each having the same polyanion but using a different polycation. Poly {1-4[4-(3-carboxy-4-hydroxyphenylazo)benzenesulfonamido]-1,…
The growth process of selenium nanoparticles prepared in a microemulsion by a reverse micelle method is probed by several techniques. The smallest particles synthesized are of the order of 40 Å in diameter, producing the usual blue shift in the optical spectra. An amorphous to crystalline phase transition was detected…
Nanometer-sized gold clusters stabilized by monolayers of arenethiolates prepared using the Brust reaction are somewhat larger (by TEM) and less thermally stable (by TGA) than those prepared under similar conditions and stabilized by alkanethiolates. Like the latter, the mean core size decreases for synthetic conditio…
We consider incorporation of particle detachment in Smoluchowski model of colloidal growth. Two approaches are considered, utilizing phenomenological rate equation and exact large-time results. Our main conclusion is that the value of the large-time diffusing particle concentration at the aggregate surface is the only…
We model two-dimensional systems of granular aggregates confined between two planes and demonstrate that at a critical grain volume fraction an abrupt rigidity transition occurs. This transition is observed both in static and shear tests. The grain volume fraction at which the transition occurs, $ν_c$, decreases with…
Models for semiconductor nanocluster growth within polymer films are presented. The models assume a diffusion−aggregation mechanism of nanocluster growth, where the semiconductor molecules aggregate to form primary particles, which then aggregate, giving larger particles. Reaction−diffusion and equilibrium models base…
Congruent melting of albite, NaAlSi 3 O 8 , is found to be a surface‐initiated process, with melt nucleating at external surfaces and internal cracks and cleavage planes. Melting rates are found to be within a factor of 5 of rates calculated by a normal growth model. The melting point of albite is shown to be in the 1…
We evaluated the in vivo biodistribution of indium- and yttrium-labeled second-generation polyamidoamine dendrimer (PAMAM) conjugated with 2-(p-isothiocyanatobenzyl)-6-methyl-diethylenetriaminepentaacetic acid (1B4M), a derivative of DTPA. In addition, we conjugated PAMAM-1B4M to humanized anti-Tac IgG (HuTac) and eva…