[en] Full text: Silica nanoparticles occupy a prominent position in scientific research due to their potential application in many areas (catalysis, adsorption, etc). Using a sol-gel method, a variety of nanoparticles have been utilised to fabricate rough surfaces and applied to the construction of super hydrophobic and super hydrophilic surfaces with micro- and nano-scale structures simulating the lotus leaf's surface while presenting self-cleaning functions [1]. Currently, the approaches used in techniques for producing hydrophobic and super hydrophobic surfaces can be generally divided into two categories: (a) creating a rough surface from a low-surface-energy material or (b) modifying a rough surface with a low-surface-energy material [1]. Nevertheless, to our knowledge, there has been no comparative study on the synthesis of monodisperse nanosilicas on the surface of commercial silicas (micrometric (Sylopol-948) or nanometric (Dispercoll)), which could generate structural differences with hydrophobic characteristics. Therefore, in this work, we compare and correlate the differences between the textural, morphological, hierarchical, and structural characteristics of five different silica-based materials by changing the amount TEOS [2]. The resulting materials were characterized by BET analysis, SAXS, DLS, FTIR, SEM and contact angle measurements. The mixed silica presented a higher: S_BET (326 m² g^-1), (SiO)₆ percentage (68%) and silanol groups (30.7%) than Sylopol-948 (271 m² g^-1, 42.6% and 12.5%, respectively). Careful analysis of the processed SAXS data attributed the differences in the surface structural characteristics to the presence of self-assembled monodisperse nanosilicas on the Sylopol or Dispercoll surface. The incorporation of synthetized nanoparticles on the Sylopol-948 surface improved its hydrophobicity (111.3 < θ <162.3 º), textural and structural characteristics [2]. The resulting materials can be potentially used as catalyst supports for olefin polymerisation reactions. References: [1] Gao, et al., Nanoscale 2012, 4, 2202. [2] Y.P. Moreno, et al., Chem.Phys.Chem. 2015, DOI: 10.1002/cphc.201500216R1. (author)