Materials Literature
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Homogeneous large-area graphene monolayers were successfully prepared ex situ on $6H$-SiC(0001). The samples have been studied systematically and the results are compared with those from a sample cut from the same wafer and prepared by in situ heating. The formation of smaller graphene flakes was found on the in situ…
An overview is given of the selective catalytic reduction of NOx by ammonia (NH3‐SCR) over metal‐exchanged zeolites. The review gives a comprehensive overview of NH3‐SCR chemistry, including undesired side‐reactions and aspects of the reaction mechanism over zeolites and the active sites involved. The review attempts…
In this work we present a low cost and scalable technique, via ambient pressure chemical vapor deposition (CVD) on polycrystalline Ni films, to fabricate large area ( approximately cm2) films of single- to few-layer graphene and to transfer the films to nonspecific substrates. These films consist of regions of 1 to ap…
Ettringite(3CaO· Al₂O₃·3CaSO₄· 32H₂O), one of the hydrated phase of Portland cement is usually formed in the early stage of hydration by the reaction of tricalciumaluminate(C₃A) and gypsum. The rapid and strong crystal growth of separated rod-shaped ettringite have been utilized for the preparation of special cements…
Main catalytic processes for hydrogen production from methanol are considered. Various schemes of fuel processors for hydrogen production in stationary, mobile and portable power plants based on fuel cells are analysed. The attention is focussed on the design of catalytic reactors of fuel processors and on the state-o…
We investigate the compressive yielding of Ni single crystals by performing atomistic simulations with the sample diameters in the range of 5 nm ∼ 40 nm. Remarkable effects of sample sizes on the yield strength are observed in the nanopillars with two different orientations. The deformation mechanisms are characterize…
Se presenta el primer registro de algas dulceacuícolas del Paleógeno de la Cuenca de Ñirihuau. La microflora proviene de la Formación Salto del Macho (Eoceno Medio - Oligoceno Temprano). El análisis palinológico y palinofacial fue llevado a cabo con el objeto de determinar las características del ambiente de depositac…
The corrosion inhibition of mild steel by ethanol extract of Piper guinensis (EEPG) has been studied using gravimetric, gasometric and thermometric methods. The results of the study reveals that the different concentrations of ethanol extract ofPiper guinensis (EEPG) inhibit mild steel corrosion. Inhibition efficiency…
We investigate the effects of vacancies, disorder and sublattice polarization on the electronic properties of a monolayer graphene in the quantum Hall regime. Energy spectra as a function of magnetic field and the localization properties of the states within the graphene Landau levels (LLs) are calculated through a ti…
We have identified the effect of the Wigner-Seitz cell geometry in the strong segregation limit of diblock copolymer melts with strong composition asymmetry. A variational problem is proposed describing the distortions of the chain paths due to the geometric constraints imposed by the cell shape. We computed the geome…
This paper has been withdrawn by the authors due to new available results. A revised version, that incorporates the new results, will be submitted later.
One of the great successes of quantum physics is the description of the long-lived Rydberg states of atoms and ions. The Bohr model is equally applicable to donor impurity atoms in semiconductor physics, where the conduction band corresponds to the vacuum, and the loosely bound electron orbiting a singly charged core…
Abstract A di-μ-fluoride mixed-valent tetrairon(II,II,III,III) complex, [{Fe2(L)(dnba)}2(μ-F)2](BF4)2, was synthesized and characterized by X-ray structural analysis, UV–vis–NIR spectroscopy, and Mössbauer measurement.
The formula of exponential time dependence of the radius of spherical bubble is derived. The parameters of this formula are determined for the first time as a result of theoretical analysis. The known experimental data, obtained under conditions of boiling in a body of liquid, on a thin wire, and on a flat surface, ar…
This review focuses on a new strategy to design covalently linked and electronically coupled porphyrin systems to achieve long-range photoinduced electron transfer. We show that the attachment of a π-conjugated bridge directly on the meso position of the porphyrin via an ethynyl or ethenyl linkage affords significant…
Abstract A cationic iridium(III) complex, [Ir(ppy)2dmbpy]+ (ppy = 2-phenylpyridine and dmbpy = 4,4′-dimethylbipyridine), was adsorbed by colloidally dispersed montmorillonite clay. The emission quantum yield (Φ) decreased from 0.06 to 0.01 on adsorption, while Φ recovered to ca. 0.12 by adding alkali or alkaline earth…
We studied a novel universal spectrochemical series of six-coordinated octahedral 3d transition metal complexes, which can be used for any combination of central metal atom and ligand molecules. A two dimensional spectrochemical series could be used to estimate the ligand field splitting energy of not only known compo…
The acidic pH-sensitivity of polyion complex vesicles (PICsomes) was investigated, using dynamic light scattering (DLS) and confocal laser scanning microscopy (CLSM). PICsomes showed pH-dependent and reversible structural transition, and also underwent a change in permeability by sensing acidic pH. Increased membrane…
A first-principle model is proposed to study the electrostatic properties of a double-gated silicon slab of nano scale in the framework of density functional theory. The applied gate voltage is approximated as a variation of the electrostatic potential on the boundary of the supercell enclosing the system. With the el…
Extensions of a previously presented Landau-de Gennes type liquid crystalline phase transition model for the direct isotropic/smectic-A (lamellar) a phase transition to the direct isotropic/smectic-C (tilted lamellar) transition are studied. Two different proposed extensions to the model are studied both in the contex…