Preparation, purification, and characterization of aminopropyl-functionalized silica sol
| Autor: | Imola Csilla Szigyártó, Teréz Kiss, Attila Bóta, Gábor Tárkányi, Réka Mizsei, Marcell Pálmai, Judith Mihály, Lívia Naszályi Nagy, Tibor Kremmer, Zoltán Varga |
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| Rok vydání: | 2013 |
| Předmět: |
Aqueous solution
Ethanol Chemistry Inorganic chemistry Nanoparticle Silanes Silicon Dioxide Surfaces Coatings and Films Electronic Optical and Magnetic Materials Biomaterials Colloid chemistry.chemical_compound Colloid and Surface Chemistry Adsorption Dynamic light scattering Reagent Zeta potential Colloids Amines Particle Size Methylsilane Acetic Acid Nuclear chemistry |
| Zdroj: | Journal of Colloid and Interface Science. 390:34-40 |
| ISSN: | 0021-9797 |
| Popis: | A new, simple, and “green” method was developed for the surface modification of 20 nm diameter Stober silica particles with 3-aminopropyl(diethoxy)methylsilane in ethanol. The bulk polycondensation of the reagent was inhibited and the stability of the sol preserved by adding a small amount of glacial acetic acid after appropriate reaction time. Centrifugation, ultrafiltration, and dialysis were compared in order to choose a convenient purification technique that allows the separation of unreacted silylating agent from the nanoparticles without destabilizing the sol. The exchange of the solvent to acidic water during the purification yielded a stable colloid, as well. Structural and morphological analysis of the obtained aminopropyl silica was performed using transmission electron microscopy (TEM), dynamic light scattering (DLS) and zeta potential measurements, Fourier-transform infrared (FTIR), 13 C and 29 Si MAS nuclear magnetic resonance (NMR) spectroscopies, as well as small angle X-ray scattering (SAXS). Our investigations revealed that the silica nanoparticle surfaces were partially covered with aminopropyl groups, and multilayer adsorption followed by polycondensation of the silylating reagent was successfully avoided. The resulting stable aminopropyl silica sol (ethanolic or aqueous) is suitable for biomedical uses due to its purity. |
| Databáze: | OpenAIRE |
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