Use este identificador para citar ou linkar para este item: http://repositorio.ufla.br/jspui/handle/1/15518
Título: Obtenção e caracterização de material híbrido entre sílica e ciclodextrinas
Título(s) alternativo(s): Obtention and characterization of a silica and cyclodextrin hybrid material
Palavras-chave: Cyclodextrin
Physicochemical characterization
Thermogravimetric analysis
Ciclodextrina
Caracterização físico-química
Análise termogravimétrica
Data do documento: Set-2015
Editor: Sociedade Brasileira de Química
Citação: BARACHO, R. V. et al. Obtenção e caracterização de material híbrido entre sílica e ciclodextrinas. Química Nova, São Paulo, v. 38, n. 8, p. 1063-1067, Sept. 2015.
Resumo: The obtention of silica and cyclodextrin hybrid materials was accomplished by refluxing them in xylol using citric acid as a binding agent. The materials were characterized by infrared spectroscopy, X-ray diffraction, thermogravimetric analysis, scanning electron microscopy, and elemental analysis. Evidence for the docking of cyclodextrins α and γ was substantiated based on the variation in band intensity for groups such as ≡Si-OH. Additional docking evidence includes the displacement of some of the bands that are related to cyclodextrin such as the deformation of the C-H axial bond. The α and γ-CDSi materials were characterized as amorphous compounds. The products obtained in the synthesis showed changes in the decomposition temperatures of their isolated constituents, in which the mass of α and γ-CD docked to the silica surface gave the estimated values of 41% and 47%, respectively. The elemental constituents were shown to be consistent and close to their relative theoretical values. ​Thermogravimetric analysis showed that a reduction in the percentage of the hybrids was proportional to the amount of lost mass. This new material is an improvement over synthesized organosilane materials because the operator and the environment benefit from a less toxic methodology. In addition, the material has several potential applications in complexation systems with cyclodextrin.
URI: http://repositorio.ufla.br/jspui/handle/1/15518
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