Materials Literature
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The construction of highly stable and efficiently assembled multilayer films of purely water soluble gold nanoparticles is reported. Citrate-stabilized nanoparticles (CS-NPs) of average core diameter of 10 nm are used as templates for stabilization-based exchange reactions with thioctic acid to form more robust aqueou…
A model to assess the performances of an annular photocatalytic reactor has been developed by investigating different operational conditions through an analysis based on the proper dimensionless parameters (namely, the optical thickness, the Thiele modulus and two among the well-known Damköhler and Peclet numbers, whi…
The electronic structure of some substituted, four-coordinate iron(II) porphyrins has been investigated with DFT methods. These systems include iron tetraphenylporphine (FeTPP), iron octamethyltetrabenzporphine (FeOTBP), iron tetra(alpha,alpha,alpha,alpha-orthopivalamide)phenylporphine (FeTpivPP, also called "picket f…
Tetraarylbiladien-ab-ones bearing various substituents (R) in the para position of the phenyl groups were preprared by coupled oxidation of tetraarylporphyrin iron complexes. The yields of 5,10,15-triaryl-19-aroyl-15-hydroxybiladien-ab-ones were 74% (R=H), 85% (R=OMe), 44% (R=COOMe), and 28% (R=CN). Kinetic studies of…
Semiconductor CdX (X=Te, Se, S) hollow structures have been successfully prepared by using Cd(OH)Cl precursors as a sacrificial template. The hollow structures can be hollow spheres or tubes by controlling the shape of the sacrificial template. The products were characterized by X-ray diffraction, transmission electro…
Abstract Gold nanoparticles prepared by trisodium citrate reduction of HAuCl 4 in poly(vinylpyrrolidone) (PVP) ethanol solution were dispersed into PVP nanofibers by electrospinning. The optical property of Au nanoparticles before and after electrospinning was measured by UV‐Vis. The morphology and distribution of gol…
Basic carbonates of nickel (Ni(CO 3 ) x (OH) y · z H 2 O, abbreviated hereafter as NBC) are uniquely reactive in absorption with reaction of dilute hydrogen sulfide (H 2 S) in nitrogen gas (N 2 ). The rate is fast at ambient temperature and the very high conversion is unusual, by comparison with other oxide and carbon…
Abstract Stabilizer effects of two types (homopolymer and copolymer) of commercially available polyoxymethylenes containing two different stabilizer packages under various aging conditions have been studied by the application of thermogravimetric analysis coupled with mass spectrometry. Increasing yellowness during th…
We present an in situ high-temperature nuclear magnetic resonance study on the structural changes in aluminophosphate glasses occurring in the temperature range between the glass transition temperature Tg and the crystallization temperature Tc, Tg < T < Tc. Decisive changes in the network organization between Tg and T…
Abstract Rutile TiO2 support is effective for increasing the formation rate as well as selectivity to H2O2. A great enhancement in the H2O2 formation rate and selectivity is achieved by controlling the particle size of Pd–Au (7:3 in weight ratio) alloy, and the average size of 18 nm exhibits the high selectivity to H2…
The origin and stability of photoluminescence (PL) are critical issues for silicon nanoparticles to be used as biological probes. Optical and electronic properties of propionic-acid (PA) -terminated silicon quantum dots (SiQDs) were studied using the density-functional tight-binding method. We find that the adsorbed P…
The present work represents the seminal study on the local properties of the grain boundaries of polycrystalline TiO 2 at elevated temperatures corresponding to the equilibrium with the gas phase of well-defined oxygen activity. These local properties have been determined from two sets of data obtained in two parallel…
The absorption and fluorescence properties of a polyphenylethynylene based conjugated polyelectrolyte with sulfonate solubilizing groups (PP2) are shown to change dramatically with solution conditions because of the equilibrium between unaggregated and aggregated forms of the polymer. The fluorescence of PP2 is strong…
Quaterphenyl derivative (QP) containing tert-butyl solubilizing groups at the terminal positions yields a stable cation radical salt that was isolated, and its structure was established by X-ray crystallography. The crystal structure of neutral QP and its cation radical (QP+•SbCl6-) provides unequivocal evidence for t…
The size of supported Ru metal particles on various supports was monitored by in situ X-ray absorption spectroscopy under aqueous phase conditions typical of biomass conversion reactions. In particular, Ru/γ-Al 2 O 3, Ru/C, Ru/TiO 2, and Ru/SiO 2 were evaluated at the Ru K edge at 473 K in neutral water and 0.4 M NaOH…
Nanocrystalline titanium dioxide (nanoTiO2) has been reported to generate reactive oxygen species (ROS) under UV illumination. In our studies, changes in mechanical properties of human skin fibroblasts, exposed to the oxidative stress induced in the presence of nanoTiO2 and UV light, were studied using atomic force mi…
Molecular dynamics simulations were used to study the wetting of nanogrooved PE and PVC polymer surfaces. The contact angles, equilibrium states, and equilibrium shapes of two nanosized water droplets were analyzed on surfaces with 1D-arranged periodic roughness of various dimensions. The composite solid-liquid contac…
In the tryptophan synthase bienzyme complex, indole produced by substrate cleavage at the alpha-site is channeled to the beta-site via a 25 A long tunnel. Within the beta-site, indole and l-Ser react with pyridoxal 5'-phosphate in a two-stage reaction to give l-Trp. In stage I, l-Ser forms an external aldimine, E(Aex1…
Three series of ionic stilbazolium salts with different counteranions have been synthesized to investigate the effect of counteranion size to crystal packing. Single crystals of five new salts were successfully grown from solution by the slow cooling and slow evaporation techniques. X-ray studies revealed that three o…
The photovoltage produced by local illumination at the Schottky contacts of carbon nanotube field-effect transistors varies substantially with gate voltage. This is particularly pronounced in ambipolar nanotube transistors where the photovoltage switches sign as the device changes from p-type to n-type. The detailed t…