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Hydrogenation of cinnamaldehyde over supported palladium catalysts

100%
Wąsikowska K., Dmowska P., Bączek N., Strzelec K., Pernak J., Markiewicz B.
Polish Journal of Chemical Technology
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2013
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vol. 15
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issue 4
28-32
EN
The selective hydrogenation of cinnamaldehyde has been studied using palladium catalysts based on epoxy resin cured with ionic liquids. Characterization of palladium catalysts has involved the following methods: IR spectroscopy, X-ray photoelectron spectroscopy (XPS), AAS spectroscopy and time-of-flight secondary ion mass spectrometry (TOF-SIMS). The investigated catalysts showed high stability and good recycling efficiency what makes them useful for a prolonged use. The factors influencing the selectivity of the supported catalysts were discussed.
2
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Hydrophobization of epoxy nanocomposite surface with 1H,1H,2H,2H-perfluorooctyltrichlorosilane for superhydrophobic properties

88%
Psarski M., Marczak J., Celichowski G., Sobieraj G., Gumowski K., Zhou F., Liu W.
Open Physics
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2012
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vol. 10
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issue 5
1197-1201
EN
Nature inspires the design of synthetic materials with superhydrophobic properties, which can be used for applications ranging from self-cleaning surfaces to microfluidic devices. Their water repellent properties are due to hierarchical (micrometer- and nanometre-scale) surface morphological structures, either made of hydrophobic substances or hydrophobized by appropriate surface treatment. In this work, the efficiency of two surface treatment procedures, with a hydrophobic fluoropolymer, synthesized and deposited from 1H,1H,2H,2H-perfluorooctyltrichlorosilane (PFOTS) is investigated. The procedures involved reactions from the gas and liquid phases of the PFOTS/hexane solutions. The hierarchical structure is created in an epoxy nanocomposite surface, by filling the resin with alumina nanoparticles and micron-sized glass beads and subsequent sandblasting with corundum microparticles. The chemical structure of the deposited fluoropolymer was examined using XPS spectroscopy. The topography of the modified surfaces was characterized using scanning electron microscopy (SEM), and atomic force microscopy (AFM). The hydrophobic properties of the modified surfaces were investigated by water contact and sliding angles measurements. The surfaces exhibited water contact angles of above 150° for both modification procedures, however only the gas phase modification provided the non-sticking behaviour of water droplets (sliding angle of 3°). The discrepancy is attributed to extra surface roughness provided by the latter procedure.
3
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Magnetic recykling of complex catalysts immobilized on thiol-functionalized polymer supports

75%
Bączek N., Strzelec K., Wąsikowska K.
Polish Journal of Chemical Technology
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2013
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vol. 15
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issue 3
65-68
EN
In this work, the application of the thiol-functionalized epoxy resin encapsulated on magnetic core as supports for palladium catalysts is reported. The study focuses on obtaining of heterogeneous catalysts which can be separated by magnetic field. Palladium complex catalyst [PdCl2(PhCN)2] has been heterogenized by anchoring to these supports via ligand exchange reaction. The characterization of polymeric supports and heterogenized palladium catalysts has involved research methods like time-of-flight secondary ion mass spectrometry (TOF-SIMS), scanning electron microscopy (SEM) and nitrogen BET surface area measurements. The activity and stability during long-term use of the investigated catalytic systems were tested in a Heck and hydrogenation reaction. The influence of the type of thiols used as epoxy hardeners and the morphology of the supports on the catalytic properties of epoxy-supported palladium catalysts was discussed.
4
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The Analysis of the Thermal and Dielectric Properties of High Voltage Insulating Materials with the Addition of Aluminium Oxide

75%
Tomášková T., Trnka P., Gutten M., Korenčiak D.
Archives of Metallurgy and Materials
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2018
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vol. 63
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issue 2
5
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Investigation of transient heat transfer in composite walls using carbon/epoxy composites as an example

63%
Terpiłowski J., Gawron B., Woroniak G.
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6
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A study of thermal diffusivity of carbon-epoxy and glass-epoxy composites using the modified pulse method

63%
Terpiłowski J., Piotrowska-Woroniak J., Romanowska J.
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