When choosing a solvent for the conventional or unconventional hydro(solvo-)thermal synthesis, its pH must be considered because of its impact on the solubility of the precursor and, consequently, on the crystallisation rate . Hence, pH plays an important role in obtaining different morphologies. Different morphologies were obtained under different pH conditions (alkaline or acidic) . For instance, in the case of titanium dioxide (TiO2) in the anatase phase, alkaline conditions lead to the formation of cubic or hexagonal structures. In contrast, under acidic conditions, the crystal morphology is almost exclusively truncated tetragonal bipyramidal . He et al. reported the hydrothermal preparation of boehmite (γ-AlOOH) nanocrystals at different pH values in the presence of different anions. According to these authors, γ-AlOOH nanorods were obtained in the presence of nitrate or chloride under acidic conditions (at pH ~4.0). In contrast, in the presence of sulfate (at pH ~4.0), γ-AlOOH nanowires were formed. At pH ~10.5, the authors observed the growth of γ-AlOOH nanoplates for all the studied anions.