Materials Literature
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We have developed a novel nanocomposite material, [PANI] 0.24 MoO 3, comprised of poly(aniline) chains interleaved with the layers of MoO 3, using concomitant ion exchange−polymerization in the presence of an external oxidizing agent. The characterization of this material using SEM, FTIR spectroscopy, powder XRD, and…
The relevance of commutator methods in spectral and scattering theory has been known for a long time, and numerous interesting results have been ob tained by such methods. The reader may find a descri
Abstract
Ultrasound has applications in materials, organometallic, polymer and synthetic chemistry as well as materials and waste degradation. After a brief description of the fundamentals of sonochemistry, an overview about current uses and future prospects in these fields is given.
Independent, practical guidance on the structural design of polymer composites is provided for the first time in this book. Structural designers familiar with design of conventional structural materials such as steel and concrete will be able to use it to design a broad range of polymeric composites for structural app…
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Hyperbranched poly(ether ketones), with a variety of chain end functional groups and controllable degrees of branching, are prepared by the polymerization of AB 2, AB 3, and AB 4 monomers. It is found that the choice of A and B, or the incorporation of dendritic and linear units into the AB x monomer structure, dramat…
Surface adsorptive properties of nanoscale MgO particles have been compared with more conventional samples. Morphologically the nanoparticles (autoclave prepared = AP-MgO) are unique and very different from the conventional samples (conventionally prepared = CP-MgO), and AP-MgO possesses more defects, edge and corner…
Optimized geometries, vibrational frequencies, and scale factors were calculated for furan and thiophene with the HF, MP2, LDA, BVWN, BLYP, and B3LYP methods of theory using the 6-31G**, cc-pVDZ, and cc-pVTZ basis sets. The agreement between the optimized and experimental geometries was in the order B3LYP, MP2, LDA, B…
Mechanistic studies of the oxidation of olefins by dioxygen plus aldehyde in the presence of metal complexes such as metalloporphyrins and metal cyclam complexes have been carried out. Epoxides were the predominant products, with trace amounts of allylic oxidation products. cis-Stilbene was oxidized to a mixture of ci…
The semiempirical tight-binding method was used to study the electronic structure of spherical PbS nanocrystals. The effects of spin−orbit coupling were included, and the calculated band gaps were found to agree well with previously published experimental values for PbS clusters. The size dependence of the band gaps w…
New graphite-like materials of composition BC 0.9-1.3 N 0.8-0.9 H 0.4-0.7 and BC 3.0-3.2 N 0.8-1.0 H 0.2-2, which are described as BCN(H) and BC 3 N(H), have been prepared by the interaction of acetonitrile with boron trichloride in a hydrogen and nitrogen atmosphere and acrylonitrile with boron trichloride, respectiv…
Thermochromism of a series of cast films of poly(3-alkylthiophenes) (P3ATs, A = hexyl, octyl, dodecyl, and hexadecyl) with different head-to-tail (HT) diad content (70−100%) was studied. The thermochromic behavior is found to be controlled by the HT diad content and the side chain length. P3ATs with moderate HT diad c…
The unusually strong, irreversible adsorption of monolayer quantities of the P 2 Mo 18 O 62 6 - anion on glassy carbon, highly ordered pyrolytic graphite, indium tin oxide, and gold-coated quartz electrodes was examined by electrochemical, spectroelectrochemical, and quartz crystal microgravimetric techniques. A very…
Diffuse reflectance FTIR spectra, X-ray diffraction patterns, and BET surface areas of La(NO 3 ) 3, La 2 (CO 3 ) 3, and La 2 O 3 have been obtained after various stages of thermal decomposition in the presence and absence of O 2 . In situ DRIFTS provided information about the surface chemistry taking place during the…
New chiral Schiff base complexes have been obtained by condensation of 2,2'-diamino-1,1'-binaphthalene or 1,2-diaminocyclohexane and various salicylaldehydes and by subsequent metalation with manganese, iron, cobalt, nickel, copper, or zinc. The complete (1)H and (13)C NMR characterization of the ligands is reported,…
Crystallization in oriented diblock copolymers containing poly(ethylene) (PE) has been investigated using simultaneous small-angle and wide-angle X-ray scattering (SAXS/WAXS). The orientation of the crystallized PE stems was deduced from the orientation of peaks in the WAXS pattern with respect to those in the SAXS to…
Nanoparticles of copper sulfide have been synthesized by reacting a copper ammonia complex with an equimolar thiourea solution in Triton-X 100/cyclohexane water-in-oil microemulsions. The presence of an exceptionally sharp and blue-shifted peak at 475 ± 2 nm in the UV−vis spectrum reveals the formation of quasi-monodi…
Results are presented from a variable-temperature solution-phase laser photolysis study of the 5 T 2 → 1 A 1 intersystem crossing in a series of related complexes: [Fe(tpen)](ClO 4 ) 2, [Fe(tppn)](ClO 4 ) 2, [Fe(tptn)](ClO 4 ) 2, [Fe( t -tpchxn)](ClO 4 ) 2, and [Fe(dpa) 2 ](ClO 4 ) 2 . The hexadentate ligands are form…
A diblock copolymer of deuterated styrene and isoprene (dPS−PI) with a small volume fraction of isoprene was chemically modified to incorporate pendant fluorinated side chains (“fingers”). The composition distribution of the diblock copolymers within a high molecular weight polystyrene (PS) homopolymer was determined…