Fluoroalkylsilane versus Alkylsilane as Hydrophobic Agents for Silica and SilicatesReportar como inadecuado

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Journal of NanomaterialsVolume 2013 2013, Article ID 631938, 13 pages

Research Article

Institute of Chemical Technology and Engineering, Faculty of Chemical Technology, Poznan University of Technology, M. Sklodowskiej-Curie 2, 60965 Poznan, Poland

Department of Organometallic Chemistry, Faculty of Chemistry, Adam Mickiewicz University, Grunwaldzka 6, 60780 Poznan, Poland

Institute of Materials Science and Engineering, Faculty of Mechanical Engineering and Management, Poznan University of Technology, Jana Pawla II 24, 60965 Poznan, Poland

Poznan Science & Technology Park, AMU Foundation, Rubiez 46, 61612 Poznan, Poland

Received 3 July 2013; Revised 23 August 2013; Accepted 28 August 2013

Academic Editor: Mengnan Qu

Copyright © 2013 Damian Ambrożewicz et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Hydrophobic powders were obtained via surface modification of silica or magnesium silicate with selected silanes. A modified precipitation method, carried out in an emulsion system, was used for monodisperse silica synthesis, while magnesium silicate was precipitated in a traditional water system. Functionalization of the obtained inorganic supports was performed with selected alkylsilanes: one newly synthesized, 3-2,2,3,3,4,4,5,5-octafluoropentyloxypropyltriethoxysilane OPF, and two commercial, octadecylsilane ODS and octyltriethoxysilane C14H32O3Si OCS, in amounts of 3, 5, or 10 weight parts by mass of SiO2. It was determined how the chemical modification of the silica or magnesium silicate surface affected its physicochemical properties. The dispersive characteristics of both unmodified and functionalized silica-based systems were evaluated. The morphology and microstructure of the samples obtained were analyzed using scanning electron microscopy. The parameters of porous structure of the prepared systems were evaluated on the basis of BET equation as well as nitrogen adsorption-desorption isotherms. Wettability tests as well as elemental analysis of the obtained inorganic oxide hybrids were also performed. In order to verify the effectiveness of silica and magnesium silicate surface functionalization with selected silanes, FTIR spectra were investigated. The resulting experimental data allowed calculation of the degree of coverage of the silica-based systems with modifying agents.

Autor: Damian Ambrożewicz, Filip Ciesielczyk, Magdalena Nowacka, Joanna Karasiewicz, Adam Piasecki, Hieronim Maciejewski, and Teof

Fuente: https://www.hindawi.com/


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