Chitosan-nanosilica hybrid materials: Preparation and properties
| Autor: | B.B. Palyanytsya, T.V. Kulik, L. Mikhalovska, Krisztina László, Ajna Tóth, Alfréd Menyhárd, Vladimir M. Gun’ko, T.V. Podust |
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| Rok vydání: | 2014 |
| Předmět: |
Materials science
General Physics and Astronomy macromolecular substances Surfaces and Interfaces General Chemistry Condensed Matter Physics Surfaces Coatings and Films Chitosan Thermogravimetry chemistry.chemical_compound Silanol Adsorption chemistry Chemical engineering Dynamic light scattering Desorption Polymer chemistry Surface modification Hybrid material |
| Zdroj: | Applied Surface Science. 320:563-569 |
| ISSN: | 0169-4332 |
| DOI: | 10.1016/j.apsusc.2014.09.038 |
| Popis: | The research focuses on the synthesis of novel organic–inorganic hybrid materials based on polysaccharide chitosan and nanosilicas (SiO2, TiO2/SiO2 and Al2O3/SiO2). The chitosan modified nanooxides were obtained by the equilibrium adsorption method. The chitosan adsorption capacities of silica/titania and silica/alumina are higher than of the plain silica due to the additional active sites present on the surfaces of the mixed oxides. The hybrid materials were characterized by low-temperature nitrogen adsorption/desorption, photon correlation spectroscopy (PCS), scanning electron microscopy (SEM), thermogravimetry (TG/DTG) and temperature-programmed desorption with mass spectrometry control (TPD MS) methods. The chitosan treatment only modestly influences the surface area SBET of the nanooxides but the rearrangement of the secondary and tertiary structures (aggregates and agglomerates) results in an enhancement of the mesoporosity and affects the size of the aggregates. The more severe thermodestruction of the polysaccharide desorbing from the modified mixed silicas indicates a stronger interaction between the chitosan and the mixed oxides compared to the silanol groups of the plain silica surface. |
| Databáze: | OpenAIRE |
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