Fluoroalkylsilane versus Alkylsilane as Hydrophobic Agents for Silica and Silicates
PBN-AR
Instytucja
Wydział Chemii (Uniwersytet im. Adama Mickiewicza w Poznaniu)
Źródłowe zdarzenia ewaluacyjne
Informacje podstawowe
Główny język publikacji
en
Czasopismo
Journal of Nanomaterials
ISSN
1687-4110
EISSN
1687-4129
Wydawca
HINDAWI PUBLISHING CORPORATION
DOI
URL
Rok publikacji
2013
Numer zeszytu
Strony od-do
631938
Numer tomu
2013
Link do pełnego tekstu
Identyfikator DOI
Liczba arkuszy
Słowa kluczowe
CAB-O-SIL;
QUATERNARY AMMONIUM GROUP;
ADSORPTION BEHAVIOR;
COLLOIDAL SILICA;
SURFACE MODIFICATION;
SILYLATION REACTIONS;
NONIONIC SURFACTANT;
FTIR SPECTROSCOPY;
STATIONARY PHASES;
COUPLING AGENT
Streszczenia
Język
Treść
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-octafluoropentyloxy)propyltriethoxysilane (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.
Inne
System-identifier
PX-58b524c2d5de9cc1dd9a55f6
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