Łukasz Klapiszewski, Magdalena Nowacka, Katarzyna Siwińska-Stefańska and Teofil Jesionowski
Advanced silica/lignosulfonate composites were obtained using magnesium lignosulfonate and silica precipitated in a polar medium. For comparative purposes analogous synthesis was performed using commercial silica Aerosil®200. Lignosulfonates are waste products of paper industry and their application in new multifunctional materials is of great economic interest. The composites obtained were subjected to thorough characterization by determination of their physicochemical, dispersive-morphological and electrokinetic properties. Their particle size distribution was measured, SEM images were taken, FT-IR analysis and colorimetric study were made, thermal and electrokinetic stabilities and parameters of porous structure were also determined. The results can be of interest in further application studies
Zenon Sarbak, Grażyna Fabiś and Sławomir Binkowski
Structural and textural characterisation of NiMo catalysts supported on various zeolites
Structural and textural properties of nickel-molybdenum catalysts supported on four various type of zeolites of different chemical composition and porous structure have been studied by the methods of IR, XRD and the low-temperature sorption of nitrogen. The catalysts have been obtained by the two-stage impregnation of the supports with the solutions of nickel and molybdenum salts by the method of incipient wetness. The catalysts have been shown to preserve the structure characteristic of the appropriate zeolite supports.
Agnieszka Pilarska, Marek Lukosek, Katarzyna Siwińska-Stefańska, Krzysztof Pilarski and Teofil Jesionowski
Synthesis of magnesium hydroxide was performed by the precipitation method with the use of magnesium sulfate and sodium hydroxide. The infiuence of temperature and ratio of reagents was studied. Magnesium hydroxides, and the magnesium oxides obtained from them by thermal decomposition, were analyzed to determine their bulk density, polydispersity and particle size. The magnesium oxide with the largest surface area was tested as a catalyst in the oxyethylation of lauryl alcohol, and shown to be selective but poorly reactive in comparison with commercially available catalysts. Further studies are needed to improve its reactivity.
Damian Wojcieszak, Michał Mazur, Danuta Kaczmarek, Jerzy Morgiel, Agata Poniedziałek, Jarosław Domaradzki and Aleksandra Czeczot
Titanium dioxide thin films doped with the same amount of neodymium were prepared using two different magnetron sputtering methods. Thin films of anatase structure were deposited with the aid of Low Pressure Hot Target Magnetron Sputtering, while rutile coatings were manufactured using High Energy Reactive Magnetron Sputtering process. The thin films composition was determined by energy dispersive spectroscopy and the amount of the dopant was equal to 1 at. %. Structural properties were evaluated using transmission electron microscopy and revealed that anatase films had fibrous structure, while rutile had densely packed columnar structure. Atomic force microscopy investigations showed that the surface of both films was homogenous and consisted of nanocrystalline grains. Photocatalytic activity was assessed based on the phenol decomposition. Results showed that both thin films were photocatalytically active, however coating with anatase phase decomposed higher amount of phenol. The transparency of both thin films was high and equal to ca. 80% in the visible wavelength range. The photoluminescence intensity was much higher in case of the coating with rutile structure.
Aleksandra Ratajska, Wojciech Kulak, Artur Poeppel, Andreas Seyler and Zbigniew Roslaniec
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Damian Wojcieszak, Danuta Kaczmarek, Jarosław Domaradzki, Michał Mazur, Antoni W. Morawski, Magdalena Janus, Eugenius Prociów and Pietro Gemmellaro
of Eu dopant on optical properties of TiO2 thin fi lms fabricated by low pressure hot target reactive sputtering. Opt. Appl . 37, 117-122.
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Puyou Jia, Meng Zhang, Caiying Bo, Lihong Hu and Yonghong Zhou
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Piotr Homa, Beata Tryba and Andżelika Gęsikiewicz-Puchalska
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Salima Chebbi, Atmane Allouche, Marian Schwarz, Souhila Rabhi, Hayet Belkacemi and Djoudi Merabet
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Lau EV, Foo KL, Poh PE (2013) The