Abstract
Colloidal sol−gel technology is widely used as a powerful synthesis route. It consists of two main stages, hydrolysis and peptization. The quantification of peptization time is necessary to improve the processing control and enhance product reliability. However, the peptization time is normally estimated by simple visual inspection. The aim of this work is to establish for the first time a procedure to quantify the peptization time. For such purposes, different optical techniques have been used, in particular the measurements of particle size distribution by laser diffraction and by dynamic light scattering. The experimental mismatch between both series of data allows determining the peptization time, and the results are in good agreement with turbidimetry measurements through the transmission of near-infrared light source. The synthesis of titania has been selected as a case study because anatase presents a large interest in many different applications. It has been demonstrated that peptization time sign...
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