Materials Literature
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Abstract A model of iron carbonate (FeCO3) film growth is proposed, which is an extension of the recent mechanistic model of CO2 corrosion by Nesic et al.1. In the present model the film growth occurs by precipitation of iron carbonate once saturation is exceeded. The kinetics of precipitation is dependent on temperat…
Abstract Several prediction models for CO2 corrosion of oil and gas pipelines have been developed. Some of the models are based on mechanistic modeling of the different processes involved in CO2 corrosion of carbon steel, while other models are mainly based on empirical correlations with laboratory or field data. The…
Two new Ru(II) diimine chromophores, each containing a single photochromic dianthryl unit, have been prepared and characterized. The photoluminescence from the Ru(II) complexes is modulated by the photochromic action of the dianthryl species, which serves as a triplet energy transfer quencher in one photochromic state…
This paper reports in situ formation of Au/Pt bimetallic nanoparticles on the surface of polystyrene microspheres. This was accomplished by dispersion copolymerization of styrene and a poly(N-isopropylacrylamide) (PNIPAAm) macromonomer in ethanol−water media in the presence of HAuCl 4 and H 2 PtCl 6 . The particle siz…
Ordered mesoporous organosilica with large (10 nm) cagelike pores was synthesized using a triblock copolymer template and characterized using 29Si and 13C NMR spectroscopy, nitrogen adsorption, thermogravimetry, TEM, and SAXS.
A series of dimethyldihydropyrene derivatives was studied to elucidate the photochemical mechanism associated with the switching between the dimethyldihydropyrene (DHP, closed) and metacyclophanediene (CPD, open) forms of the molecule. Quantum yields of ring opening and closure, fluorescence quantum yields and lifetim…
The intercalation of organically modified montmorillonite (OMMT) in the polymer blend of poly(ethylene oxide) (PEO) and poly(methyl methacrylate) (PMMA) has been demonstrated using dichloromethane as the cosolvent at room temperature. X-ray diffraction has been used to confirm the formation of nanoscale polymers-OMMT…
The trap-filling effect on the kinetics of charge recombination in dye-sensitized TiO 2 nanoparticles is discussed on the basis of the random flight model. The model assumes that electrons move between trap sites on the surface of a nanoparticle by diffusion in the conduction band. After an electron is thermally detra…
Molecular dynamics (MD) simulation has been employed to study the nonequilibrium structure formation of two types of particles in a colloidal suspension, driven by type-dependent forces. We examined the time evolution of structure formation as well as the structural properties of the resulting aggregation by studying…
The phase behaviors of polystyrene- block -poly( n -butyl methacrylate) (P(S- b -nBMA)) and polystyrene- block -polyisoprene (P(S- b -I)) copolymers were studied in the presence of methane, ethane, propane, butane, and tetradecane. Sorption of the light alkanes induces phase segregation in P(S- b -nBMA), depressing th…
Neutron structure analysis of poly(pyridobisimidazole) (PIPD) was carried out at 10, 100, 200, and 295 K. The crystal structure projected through the fiber axis was clarified. Two molecular chains pass through a rectangular unit cell with parameters a ‘ = 12.85 Å and b = 3.462 Å (at 295 K), the plane group, pgg. PIPD…
The redetermination of the structure of the title compound, Co2P2O7, agrees with the results previously reported by Krishnamachari & Calvo [Acta Cryst. (1972), B28, 2883–2885], but with improved precision.
In this work, extensive thermo-Raman investigations have been carried out on a γ(L)-Bi 2 MoO 6 sample (`(L)' indicating the low-temperature polymorph) in an effort to gain an understanding of the structural evolution and phase transformation involved during a dynamical thermal process. The room temperature Raman spect…
A new kinetic model of kaolinite dehydroxylation is proposed in order to take into account data obtained by gravimetry at 450 °C under controlled water vapour pressure ranging from 2.5 to 10 mbar. This model involves a process of random nucleation and anisotropic growth of nuclei. Under the above experimental conditio…
A series of MFI supported bimetallic catalysts with high Co/Pd ratios and high metal loading was prepared by first subliming CoBr2 vapor onto H/MFI, followed by ion exchange of some Pd from an aqueous solution of Pd(NH3)4(NO3)2. They were tested for NO reduction with CH4 in the presence of 2% O2. Best performance was…
A novel synthesis of uranium tetraboride (UB(4)) by solid-state metathesis reaction is demonstrated. This approach significantly lowers the temperature required to synthesize this material to < or = 850 degrees C. When UCl(4) is reacted with 2 equiv of MgB(2) at 850 degrees C, crystalline UB(4) is formed. Powder X-ray…
Photoluminescent porous silicon has been produced in a variety of etchants using laser-assisted etching of silicon without an applied potential. Porous silicon (por-Si) produced from etchants containing K +, Cs +, or Rb + can have cubic crystallites of hexafluorosilicate on top of and embedded in the porous silicon fi…
Spectroscopic ellipsometry (SE) has been used to monitor the time-dependent process of swelling of phosphorylcholine (PC) biocompatible polymer films of different initial dry film thicknesses. Factors including the extent of silyl cross-linker, ratio of hydrophilic and hydrophobic moieties, annealing temperature, and…
We present a detailed investigation of the low-frequency dielectric response of the charge-density-wave system (CDW) $o\ensuremath{-}{\mathrm{TaS}}_{3}$ in wide temperature (5--300 K) and frequency (10 mHz to 100 MHz) ranges. Although our measurements agree relatively well with data performed in some restricted freque…
This article surveys some results concerning motion by mean curvature (MMC) for curves and surfaces. Emphasis will be put on methods of incorporating stochastic noise. In addition, we will demonstrate the idea of using noise to provide a selection principle for non-unique solutions.