Materials Literature
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Abstract Catalytic partial oxidation of methane with air was investigated in a reverse flow reactor with commercial Rh/Al 2 O 3 catalyst in pellets. Temperature profile of the catalyst bed was measured by fast IR thermography and product composition was measured with a continuous gas analyzer. The effect of internal h…
The molecular structure of phthalocyaninatotin(II), Sn(II)Pc, is determined by density functional theory (DFT/B3LYP) calculations using various basis sets and gas-phase electron diffraction (GED). The quantum chemical calculations show that Sn(II)Pc has C4V symmetry, and this symmetry is consistent with the structure…
${\text{Sr}}_{0.95}{\text{Pr}}_{0.05}{\text{TiO}}_{3}$ ceramic is shown to exhibit anomalous value of cubic lattice parameter at room temperature. A combination of temperature dependent dielectric and synchrotron x-ray powder-diffraction study has revealed that the anomalous lattice parameter has contribution from spo…
Different classes of interesting materials (such as protocrystalline, microcrystalline and nanocrystalline) have been grown under conditions very near to those for the microcrystalline phase. In spite of the importance of these materials, a clear picture regarding their phase transitions is missing. A smooth transitio…
Selected quality characteristics of fresh-cut sweet potatoes (FCSP) coated with chitosan were evaluated during 17-d refrigerated storage. The FCSP cubes were coated with a solution (1%, w/v) of chitosan having 470 or 1110 kDa. Color (L*, a*, b*) values of uncoated and chitosan-coated FCSP during storage were generally…
Antimicrobial activities of chitosan samples with different molecular weights (1333, 432, 201, 131, and 104 kDa) prepared by ozone treatment were examined against 2 Gram-positive bacteria (Listeria monocytogenes and Staphylococcus aureus) and 2 Gram-negative bacteria (Escherichia coli and Pseudomonas fluorescen) to in…
With use of the first-principles density functional theory with the inclusion of the on-site Coulomb interaction of the Ce4f electrons (DFT+ U ) method, the adsorption of CO on the (110) surface of a stoichiometric Ce 0.75 Zr 0.25 O 2 system is studied systematically. It is found that, (1) in addition to the carbonate…
An easy transition: Facile generation of methanol is achieved by hydroxide-promoted transfer of a nucleophilic methyl group from methyltrioxorhenium to osmium tetroxide in basic aqueous medium via a cyclic transition state. 1H NMR spectroscopy and density functional calculations are used to investigate reaction pathwa…
Abstract Chemical Vapor Deposition is a method widely used in the synthesis of carbon nanotubes of one and multiple walls. However, the interdependent parameters playing a role in this synthesis approach are scarcely explored when single‐walled doped carbon nanotubes are the aimed product. It is well known that one me…
We report on the design and synthesis of new laser hybrid materials based on dye-doped poly(methyl methacrylate) cross-linked with octa(methyl methacrylate)-POSS (polyhedral oligomeric silsesquioxanes). The enhancement of the thermal and optical properties of these hybrid matrices lead to the best laser action reporte…
Single crystal β-MnO 2 films have been epitaxially grown on (001) LaAlO 3 and (001) MgO substrates by using plasma-assisted molecular beam epitaxy. On the basis of reflective high energy electron diffraction, X-ray diffraction, Raman spectroscopy, and X-ray photoemission spectroscopy, the films are confirmed to be β-M…
The temperature-dependent resistivity and the colossal resistance effect induced by strong electric fields of the small-band Pr 1− x Ca x MnO 3 (PCMO) manganites are analysed with respect to the influence of the Ca doping, post-annealing, the prehistory of the electric stimulation, and the physical dimensions of the s…
We describe here a method for study of bulk release and local molecular transport within mesoporous silica spheres. We have analyzed the loading and release of charged fluorescent dyes from monodisperse mesoporous silica (MMS) spheres with an average pore size of 2.7 nm. Two different fluorescent dyes, one cationic an…
Vertically aligned ZnO nanowires were synthesized on a sapphire ([Formula: see text]) substrate by vapour deposition and their light-emitting properties were characterized using photoluminescence and cathodoluminescence spectroscopies. Besides the nanowires, there exists a mosaic ZnO film on the substrate surface. Com…
The crystallization of dl -alanine from water/alcohol supersaturated solutions results in the precipitation of a racemic compound displaying a needlelike hollow morphology, in contrast to the needlelike crystals grown from pure aqueous solutions. This unusual morphology is explained by assuming that the supersaturated…
Di-interstitial defects appear to play a key role in the microscopic understanding of radiation-induced damage in graphite. Their formation has been invoked as both one of the main causes of dimensional change and as an energy releasing step in annealing cryogenic radiation-induced damage. In the present work, first p…
The NH 3 + O 2 reaction on a Pt(533) surface has been studied in the 10 −4 mbar range and close to 1 mbar pressure with in situ X-ray photoelectron spectroscopy using synchrotron radiation. The coverages of the various O- and N-containing surface species have been followed in T-cycling experiments with varying mixing…
Sorption of nitrobenzene, phenol, and m-nitrophenol from water and n-hexadecane was measured on Na-montmorillonite and organoclays in which 41 and 90% of the exchange capacity of the Na-clay was occupied by hexadecyltrimethylammonium. The strength of sorbate-sorbent interactions in n-hexadecane for all three sorbents…
Using atomistic molecular dynamic simulations we study the transitions between solid herringbone and liquid crystalline hexagonal mesophases of discotic liquid crystals formed by hexabenzocoronene derivatives. Combining a united atom representation for the side chains with the fully atomistic description of the core,…
This message will self-destruct! Polymers that can be triggered to disassemble in a sequential fashion following a single triggering event were described recently. The amplification effect after cleavage of an end group by an enzyme leads to the spontaneous fragmentation of the polymer and the release of fluorescent r…