Materials Literature
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Conductive polyaniline solutions were chemically prepared using bis (2-ethylhexyl) hydrogen phosphate (DiOHP) as the dopant chemical species. The codissolution method leads to conductive polyaniline–polystyrene (PANI–PSt) composites with good mechanical properties. The electronic structure of both conducting PANI film…
Reaction of nanocrystalline (“porous”) silicon with phenyllithium and lithium phenylacetylide results in functionalization of the silicon surface with phenyl and phenylacetylene moieties, respectively. The reaction proceeds by addition of the aryllithium reagent across a surface Si−Si bond, resulting in a Si−aryl bond…
The evolution of the dispersed surface molybdate phase on high-surface-area magnesium oxide is studied as a function of weight loading of MoO 3 and calcination temperature using in situ Mo L 3 -edge X-ray absorption near edge spectroscopy, in situ laser Raman spectroscopy, and thermogravimetry−mass spectroscopy. Under…
Mn4/(AE)2 complexes, AE = Ca, 1 or Ba, 2, display MnIII3MnII valence-trapped states and Jahn−Teller compressed MnIII ions, consistent with the S0 (or S-2) oxidation level of PSII. Ba2+ and Ca2+ ligate Mn-bonded carboxylate oxygens either directly or via H2O molecules, respectively. The (O−H−O)3- ligand, symmetric, μ4,…
The synthesis and the phase behavior of a homologous series of polymers of 4,4‘-[1,12-dodecanediylbis(oxy)]bis(benzoic acid) with bis[ N -[[2,4-dihydroxyphenyl]methylene]alkylamino]nickel(II), -palladium(II) and -oxovanadium(II) are reported. Calorimetric and X-ray diffraction data and dynamic viscosity measurements a…
Poly(3-hydroxyoctanoate- co -3-hydroxy-10-undecenoate)s (PHOUs) with controlled amounts of unsaturated side chains were produced by Pseudomonas oleovorans from various mixtures of 10-undecenoic acid and octanoic acid. Epoxidation of the unsaturated side chains in PHOU, by reacting the polymer with m -chloroperbenzoic…
The self-assembling technique was employed for modification of a citrate-reduced silver hydrosol with mercaptoethanol (ME). The results of investigation of the structure and properties of both the self-assembled monolayers (SAMs) of ME and the modified hydrosol as a substrate for surface-enhanced Raman scattering (SER…
Nonlinear optical properties in the fullerene C$_{60}$ and the extracted higher fullerenes -- C$_{70}$, C$_{76}$, C$_{78}$, and C$_{84}$ -- are theoretically investigated by using the exciton formalism and the sum-over-states method. We find that off-resonant third order susceptibilities of higher fullerenes are a few…
Pulsed plasma polymerization is used to produce aromatic thin films from inductively coupled rf plasmas with benzene, 1,2,4-trifluorobenzene, and hexafluorobenzene as monomers. The effects of aromatic monomer fluorination and duty cycle variation on the resulting films' properties are examined. The surface and bulk pr…
Colloidal silver has been formed either by irradiation with 253.7 nm light or by chemical reduction of AgClO 4 in the presence of protective agents such as poly(vinylpyrrolidone), carboxy methyl cellulose, and gelatin. The particles were characterized by their absorption maximum and transmission electron micrographs.…
Poly(butylene terephthalate) (PBT) was depolymerized in refluxing o -dichlorobenzene using stannoxane catalysts to produce good yields of cyclic oligomers. We have studied how the ring size distribution varies as a function of the starting concentration of monomer units. Over a concentration range of 0.05 to 0.2 M, th…
Kinetics and mechanism for the bimolecular decomposition of HONO have been studied by ab initio molecular orbital (G2M) and transition-state theory calculations. The reaction can take place by the interaction of a cis and a trans isomer or two cis or two trans isomers, via four-, five-, and six-member ring transition…
The dynamics of micrometer-size polystyrene latex particles confined in thinning foam films was investigated by microscopic interferometric observation. The behavior of the entrapped particles depends on the mobility of the film surfaces, the particle concentration, hydrophobicity, and rate of film formation. When the…
Ch 1 - Historical Introduction. Ch 2 - Radioactivity. Ch 3 - The Discovery of the nucleus. Ch 4 - Particle accelerators and neutron sources. Ch 5 - Particle detectors. Ch 6 - Basic Forces. Ch 7 - The Leptons. Ch 8 - The Hadrons. Ch 9 - The Quarks. Ch 10 - Laws of Invasriance. Ch 11 - Boson Field Theory and Phenomenolo…
Maricite and sodium iron hydroxyphosphate (SIHP) are recently discovered iron(II) and iron(III) compounds that play a major role in phosphate “hideout” and corrosion in high-pressure boilers. This paper reports a novel method for synthesizing maricite by thermally decomposing the complex of aqueous iron(III) nitrilotr…
The catalytic mechanism of glucose 6-phosphate dehydrogenase from Leuconostoc mesenteroides was investigated by replacing three amino acids, His-240, Asp-177, and His 178, with asparagine, using site-directed mutagenesis. Each of the mutant enzymes was purified to homogeneity and characterized by substrate binding stu…
Linear optical and SHG coefficients of a number of “push−pull” porphyrins are analyzed using the semiempirical INDO/S Hamiltonian and singles-only CI. The NLO response properties are computed at a nonresonant excitation energy of 0.1 eV using the correction vector formalism, and the calculations are carried out in bot…
We describe a technique for extracting topographic information using a scanning near-field microwave microscope. By monitoring the shift of the system's resonant frequency, we obtain quantitative topographic images of uniformly conducting metal surfaces. At a frequency of 9.572 GHz, our technique allows for a height d…
Three series of zeroth to second generation chiral dendrimers, 7 − 9, 10 − 12, and 13 − 15, were prepared by convergent methods using chiral, nonracemic AB 2 monomers 1, 2, and 3, respectively. Chiroptical data revealed a significant change in molar rotation per subunit ([Φ] D / n ) as dendrimer generation increased f…
A model based on the Cahn−Hilliard formalism is used to simulate structure formation in thermally quenched polymer solutions in the vicinity of a glass transition. Simulation results for the system poly(methyl methacrylate)/cyclohexanol are correlated with light scattering and microscopy measurements recently reported…