Influence of synthesis temperature on the structural characteristics of mesoporous silica

The characteristics of mesoporous silica prepared at different temperatures and the behavior of this system relating to the microencapsulation of a model drug were investigated. The preparation of mesoporous materials was initiated with the dissolution of a surfactant in distilled water and strong acid medium. After this, tetraethyl orthosilicate was added under agitation. The mixture was heated for 24 h at the synthesis temperature (60 °C, 80 °C, 100 °C and 130 °C) under static conditions. The surfactant was removed by calcination, which was carried out by increasing the temperature to 550 °C for 5 h. Atenolol was used as a model drug to study the kinetics of drug delivery. It could be observed that aging materials at higher temperatures presents no microporosity, and this influences the control of the release of the model drug.