Materials Literature
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The reaction of nitric oxide with the carboxylate-bridged diiron(II) complex [Fe(2)(Et-HPTB)(O(2)CPh)](BF(4))(2) (1a) afforded the dinitrosyl adduct, [Fe(2)(NO)(2)(Et-HPTB)(O(2)CPh)](BF(4))(2) (1b), where Et-HPTB = N,N,N',N'-tetrakis(N-ethyl-2-benzimidazolylmethyl)-2-hydroxy-1,3-diaminopropane, in 69% yield. Compound…
Abstract Thousands of hectares of forests are burned annually in wildfires and prescribed burns nationwide. Our objective was to determine the effects of such fires on soil phyllosilicates. At five sites throughout California representing Inceptisols, Andisols, and Mollisols, surface soil samples from similar depths w…
57 Fe Mössbauer absorption spectroscopy studies have been performed in zero magnetic field in the temperature range 4.2−200 K, in cobalt ferrite (CoFe 2 O 4 ) magnetic fluids that differ in the mean size of their particles. For particles with an average diameter of 2 and 3 nm, a quadrupolar doublet progressively repla…
A new algorithm is presented to calculate the analytical molecular surface defined as a smooth envelope traced out by the surface of a probe sphere rolled over the molecule. The core of the algorithm is the sequential build up of multi-arc contours on the van der Waals spheres. This algorithm yields substantial reduct…
Helically-patterned arrays of gold particles are formed using lipid tubules as templates.
A model of hysteresis has been developed earlier in which the susceptibility depends on the displacement of the prevailing magnetization from the anhysteretic. This model does not take into account the effect of magnetocrystalline anisotropy in a material. In the current work, it has been shown that the effect of anis…
A brief examination of some issues of current interest in polymer physical chemistry is provided. Emphasis is placed on topics for which the interplay of theory and experiment has been particularly fruitful. The dominant theme is the competition between conformational entropy, which resists distortion of the average c…
Oxygen permeability (OP) and water vapor permeability (WVP) of whey protein isolate (WPI) and β-lactoglobulin (β-Lg) edible films were studied at three different levels of glycerol content. WVP and OP of WPI films were not statistically different from WVP and OP of β-Lg films. Although the presence of glycerol as plas…
Fluorescence-activated sodium hexametaphosphate stabilized CdS particles have been transferred from water into apolar organic solvents (chloroform and hexane) by dioctadecyldimethylammonium bromide (DODAB) and by cetyltrimethylammonium chloride (CTAC) and spread on water surfaces in a Langmuir film balance. Surface pr…
Femtosecond pump−probe transient absorption measurements were performed for thermally evaporated polycrystalline vanadyl and lead phthalocyanine (VOPc and PbPc) films in order to obtain information about the excitation energy migration and relaxation. The films were shown to be composed of phase II and amorphous mater…
We have investigated the changes in the molecular conformation, morphology, and conductivity of polyaniline as it transforms from the insulating emeraldine base (PANI-EB) to the conducting emeraldine salt (PANI-ES) in solutions of hexafluoro-2-propanol (HFIP) and in films processed from the same solvent. Since both PA…
The ability of sodium dodecyl sulfate (SDS) to plasticize edible films from whey protein isolate (WPI) was assessed. SDS was not able to plasticize WPI films on its own, but it was an effective coplasticizer in films containing either sorbitol or glycerol as the main plasticizer. In films that contained sorbitol, a ma…
A new and simple method for the preparation of uniform zinc oxide colloidal particles of different morphologies by controlled double-jet precipitation is described. Scanning electron microscopy and X-ray diffraction data indicate that the solids generated under different conditions have identical crystallite structure…
The reaction of 4,4‘-(1,4-phenylene)bis(2,6-diphenylpyrylium tetrafluoroborate) with nitromethane afforded 4,4‘‘-dinitro-3,5,3‘‘,5‘‘-tetraphenyl- p -terphenyl, which was catalytically hydrogenated to the corresponding diamine. The latter was used as starting material for the preparation of new rigid-rod polyamide, pol…
The order−disorder transition (ODT) and the ordering kinetics have been studied in four-arm star diblock copolymer melts of styrene (corona) and isoprene (core) by rheology and SAXS. The results are compared with the corresponding linear diblock and show that the transition shifts in the direction predicted by theory.…
A viscoplastic model is presented for distributing the deformation applied to a polycrystal in a non-uniform fashion among the constituent crystals. Interactions with surrounding crystals are incorporated in the calculation of the deformation rate of each crystal through an appropriately defined local neighborhood. A…
A peroxo titanic acid (PTA) solution has been prepared by mixing titanic acid wet gel and hydrogen peroxide solution. The PTA solution was a neutral, transparent, stable liquid. The PTA crystallized to form an anatase phase after calcination at a temperature above 250°C. When the PTA solution was autoclaved at a tempe…
The fluorescence properties of two macrocyclic ligands incorporating bis-(β-naphthyl amide) groups, –CH2CON(CH2C10H7)2, as fluorophores, have been studied in water and acetonitrile. The ligands exhibit distinctive luminescence behaviour in the presence of quenching (e.g. Pb2+, Ni2+, Cu2+ and Eu3+) and non-quenching io…
The surface composition of electrically conductive polypyrrole-coated polystyrene latex particles has been examined by X-ray photoelectron spectroscopy (XPS). We have systematically characterized the surface of polystyrene (PS), poly( N -vinylpyrrolidone) (PNVP), chloride-doped polypyrrole (PPyCl) powder, and PNVP-sta…
New deposits of saponite have been described recently in the Madrid Basin (Madrid and Toledo provinces, Central Spain), a zone very rich in Mg silicates, especially in sepiolite. This is the first time that the high surface area saponitic material from Yunclillos deposit (Toledo province) is described. The acid treatm…