SÍNTESE E PROPRIEDADES DE SÍLICAS HÍBRIDAS CONTENDO SURFACTANTES CETILTRIALQUILAMÔNIO

• Main Authors: Ana Flavia P. de Campos, Aurélia Retiella O. Ferreira, Dilson Cardoso
• Format: Article
• Language: English
• Published: Sociedade Brasileira de Química 2016-04-01
• Series: Química Nova
• Subjects: hybrid silicas; cations cetyltrialkylammonium; MCM-41
• Online Access: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422016000300279&lng=en&tlng=en

This work presents the synthesis of silicas containing cetyltrialkylammoniun surfactants in their mesopores. Initially, the aqueous dispersions of these surfactants were characterized by small-angle X-ray scattering (SAXS). The hybrid silicas obtained from these dispersions were evaluated by X-ray diffractometry (XRD) and nitrogen physisorption. The XRD showed that, increasing the head size, there is a shift of the peak corresponding to the (100) diffraction plane to smaller 2θ angles, which indicates an increase in the silicas porous diameter. The increasing of the silicas porous diameter was confirmed by nitrogen physisorption. The base catalytic properties of these hybrid silicas were evaluated in the transesterification reaction showing that those containing the cations C16Et3+ and C16Pr3+ showed better performance.