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anatase crystal structure is more favorable than rutile as it is more active with band gap energy of 3.2 eV than rutile (3.0 eV) [ 29 , 30 ]. Consequently, the reason for the increase in the photocatalytic activity of film B should be ascribed to

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included Th, Si, and U. Also, minor amounts of Fe, Ca, Zr, and Hf were noticed as substitution in uranothorite crystal structure. 4.2.4 Sulfide minerals Pyrite is the most common sulfide minerals. The studied pyrite grains have metallic luster brass

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Rod-shaped nanocrystals are formed by self assembly of t -Bu-phenyl substituted tetra(carboxamido)perylenes (BPP) in different solvents. The structure and the dimensions of the nano-rods may be controlled by the choice of the hydrogen-bond accepting capacity of the solvent (DMSO, DMF, DMAc, HMPA), by the concentration and by the composition of solvent-mixture (by adding hydrogen-bond donating solvents), but is independent of the surface used for their deposition (mica, silicon, gold, glass). The different forms of aggregation were examined by AFM and SNOM and were correlated to UV-Vis absorption spectra of the aggregates in solution. The orientation of the transition dipole moment of the molecules in the nanocrystals has been determined by polarized fluorescence microscopy and, in combination with the crystal structure of the t -Bu substituted analogue of BPP, is used to develop a model for the internal molecular structure of the rod shaped aggregates.

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Abstract  

New and efficient Keggin heteropolyacid (HPA) catalysts were explored for β-pinene (PI) cationic polymerization. Among them, 12-phosphotungstic acid (PW12) dehydrated at 200 °C exhibited high catalytic activity. The overall PI conversion was up to 96.53%, and the obtained polymer product yield was 60.85%. In order to study this new catalyzed reaction, special techniques of FT-IR, 1H-NMR, XRD, and XPS were used in this paper, and it was shown that the crystal structure of the heteropoly anion was not destroyed during the reaction. The protons dissociating from the catalyst played an important role in the polymerization and the HPAs had two important functions: polymerization initiator, and the counter-anion of the growing cation center.

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.P. , Blanco-Labra , A. , Mendiola-Olaya , E. , Smith , G.M. , Moreno , A. & Whitaker , J.R. ( 2009 ): Cloning, sequencing, purification, and crystal structure of Grenache ( Vitis vinifera ) polyphenol oxidase . J. Agr. Food Chem., , 58 , 1189

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Kostrewa, D., Wyss, M., D’arcy, A. & Loon, A.P.G.M. (1999): Crystal structure of Aspergillus niger pH 2.5 acid phosphatase at 2.4 Å resolution: J. Molecular Biol., 288, 965–974. Loon A

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X-ray diffraction patterns of the nanotube arrays and the catalyst. The XRD patterns reveal that two mixed crystal structure of monoclinic phase and tetragonal phase emerge at 400 °C and monoclinic phase is the main phase (pdf Card No. 37-1484, Fig

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Huai, Q., Wang, H., Zhang, W., Colman, R.W., Robinson, H. & Ke, H. (2004): Crystal structure of phosphodiesterase 9 shows orientation variation of inhibitor 3-isobutyl-1-methylxanthine binding. PNAS , 101 , 9624

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Acta Alimentaria
Authors: Á. Tóth, E. Baka, Sz. Luzics, I. Bata-Vidács, I. Nagy, B. Bálint, R. Herczeg, F. Olasz, T. Wilk, T. Nagy, B. Kriszt, I. Nagy, and J. Kukolya

. Spezio , M. , Wilson , D.B. & Karplus , P.A. ( 1993 ). Crystal structure of the catalytic domain of a thermophilic endocellulase . Biochemistry , 32 , 9906 – 9916

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Reaction Kinetics, Mechanisms and Catalysis
Authors: Mohammad Saleh Ghodrati, Mohammad Haghighi, Jafar Sadegh Soltan Mohamdzadeh, Behzad Pourabas, and Ehsan Pipelzadeh

ultrasonic assisted method was developed for syntheses of a CdSe/TiO 2 nanocatalysts with crystal structures at different precursor ratios. The catalysts were used for the photodegradation of phenol under illumination of sunlight. The aim of this work was to

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