Functionalized silica materials synthesized via co-condensation and post-grafting methods |
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Authors: | Ana-Maria Putz László Almásy Adél Len C?t?lin Ian??i |
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Affiliation: | 1. “Coriolan Dr?gulescu” Institute of Chemistry, Timisoara, Romania;2. lacramaanamaria@yahoo.com;4. Neutron Spectroscopy Department, Wigner Research Centre for Physics, Hungarian Academy of Sciences, Budapest, Hungary;5. State Key Laboratory of Environment-Friendly Energy Materials, Southwest University of Science and Technology, Mianyang, Sichuan, China;6. Centre for Energy Research, Nuclear Analysis and Radiography Department, Budapest, Hungary;7. Faculty of Engineering and Information Technology, University of Pécs, Pécs, Hungary |
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Abstract: | Mesoporous silica particles have been prepared with functionalized precursors, used either in situ co-condensation process or as post-synthesis grafting agents, in order to deliver surface functionalisation. Aminopropyl, mercaptopropyl, vinyl and hexyl organosilanes were used as funtionalized precursors, tetraethyl orthosilicate as the base silica precursor material, hexadecyl-trimethylammonium bromide (CTAB) as directing agent and water-ethanol mixture as solvent, with ammonia catalyst. The aim was to explore the effect of various recipes on the structural properties of the composite materials. The samples’ microstructures have been evaluated using nitrogen sorption and small angle neutron scattering. Ordered mesoporous structures were obtained, for almost all synthesis conditions, after the solvent-extraction of the template agent. Only in one case, for the materials functionalized by mercaptopropyl groups in co-condensation route, disordered amorphous structure was obtained. All samples functionalized by post-grafting presented well-ordered mesoporous structures. The results have potential use for easy design of sorbent materials for drug loading or pollutant adsorption applications. |
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Keywords: | silica functionalization co-condensation post-grafting SANS nitrogen absorption |
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