Materials Literature
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Catalytic epoxidation of monoterpenes with aqueous hydrogen peroxide catalyzed by peroxotungstophosphate (PCWP) under biphase conditions using chloroform as the solvent was examined. A variety of terpenes was oxidized to the corresponding monoepoxides or diepoxides in good yields under mild conditions. For example, li…
In this article we briefly review the literature for the evaporated metals gold, silver, copper, palladium, chromium, and potassium on polyimide surfaces and compare these previous results to newer experiments using Fourier transform infrared reflection absorption spectroscopy (FT-IRAS) and near edge X-ray absorption…
We use scaling arguments and self-consistent field calculations to determine the behavior of AB diblock copolymers that are grafted to a planar surface at relatively low densities. The surrounding solution is assumed to be a theta or marginally good solvent for the A block and a poor solvent for the B block. When the…
In various activated sludge systems, sludge grows under transient (unbalanced) conditions and storage of internal polymers becomes important. Differences in storage capacity under transients are often used to explain kinetic control of bulking, but storage is neither studied in detail nor usually included in modelling…
Edible films were prepared using a combination of rice protein concentrate and the polysaccharide pullulan. The protein-pullulan mixture with up to 50% protein concentrate could be cast on a glass plate into films with tensile strength of about 18 MPa and water vapor permeability of 40 g x mil/m 2 x day x mmHg. Film s…
Interaction of a β-SiC powder with supercritical water has been studied in the temperature range 600–800 °C under 100–500 MPa pressure. Examination of the composition of corrosion products by Raman and IR spectroscopy, XRD, SEM and TEM demonstrated that carbon and silica are formed after the hydrothermal treatment of…
A self-consistent mean-field treatment of star polymers grafted to an impenetrable surface is developed and used to calculate the near-surface equilibrium segment density profiles. The effects of architecture and grafting density on molecular conformation in the absence of enthalpic interactions are explored. We find…
The photochemical and photocatalytic properties of iron meso-tetraarylporphyrins bearing an OH(-) axial ligand and different substituents in the beta-positions of the porphyrin ring are reported. Irradiation (lambda = 365 nm) in the absence of dioxygen leads to the reduction of Fe(III) to Fe(II) with the formation of…
The critical interaction strength to induce mesomorphic structures in flexible polymers by complexing with surfactants is determined by using surfactants with different hydrogen-bonding strengths. Two essential requirements have to be satisfied: (i) the association has to be strong enough, otherwise the structure diss…
Resonance Raman (RR) spectra are reported for a series of ferric complexes of meso -tetramesitylporphyrin XFe III (TMP) (where X = F -, Cl -, m -chlorobenzoate (mCB - ), CF 3 O 2 SO - (trif - ) and ClO 4 - ) and their oxidized derivatives, OFe IV (TMP •+ )(X). Mode assignments are made by RR studies of the β-pyrrole-d…
Branched polyethylene glycol (four arms, MW = 15 000) having a cinnamylidene acetyl moiety as a pendant group was synthesized by an esterification reaction between polyethylene glycol and cinnamylidene acetyl chloride. The photosensitive polymer was irradiated with a 450 W medium pressure Hg lamp (λ > 300 nm) from 5 m…
A review is presented of electrochemical noise (EN), the generic term given to fluctuations of current and potential seen in high-temperature corrosion, molten salt corrosion, and aqueous corrosion. EN levels in corrosion and particularly localized corrosion are significantly greater than EN observed in redox systems.…
The model presented in this work is based on an extension of the constant angle heat spreading, taking into account chip and substrate dimensions, and changing the spreading angle accordingly. This yields to closed form expressions accurate enough for most practical applications. Circular, square, and rectangular geom…
In an attempt to provide confirmation for the postulated mechanism of O 2 reduction in vanadium-mediated oxidative polymerization of diphenyl disulfide, a series of divanadium complexes containing salen ligand (salen = N,N ‘-ethylenebis(salicylideneamine)) were prepared, characterized, and subjected to reactivity stud…
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…