The first one occurs in the 100˚C - 150˚C range and is attributed to the desorption of volatile compound such as residual water and alcohol. The second weight loss in the 150˚C - 450˚C range is correlated with the progressive thermal degradation of the grafted tartric acid on the TiO2 nanoparticle surface. The pyrolysis of the organic surfactant is taken up to 450˚C.