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    • Keywords


      Hydrophobic surfaces; silica hybrids; sol–gel process; hydrophobic silica; coatings.

    • Abstract


      The objective of this study is to design new hybrid silica materials as templates with hydrophobic properties, prepared at room temperature by a base catalyzed sol–gel process. As silica sources, organoalkoxysilanes functionalized with short hydrophobic chains were used: tetraethylorthosilicate (TEOS), methyltriethoxysilane (MTES), vinyltriethoxysilane (VTES), octyltriethoxysilane (OTES) and isobutyltriethoxysilane (iTES). It was shown that hydrophobicity of the functionalized silica nanoparticles increased as a function of length of the aliphatic chains (MTES < iTES < OTES) or when, instead of a hydrophobic alkyl chains (substituting group of silica precursors), a monounsaturated group was used (VTES). It was observed that the samples responded in a specific way to each type (hydrophilic or hydrophobic) of the dropped liquid. Even though the experiments were limited to short hydrocarbon chains, they showed that there is a threshold to reach high hydrophobicity of the hybrid surface.

    • Author Affiliations


      Violeta Purcar1 2 Otilia Cinteza3 Marius Ghiurea1 Adriana Balan2 Simona Caprarescu4 Dan Donescu1

      1. National Research and Development Institute for Chemistry and Petrochemistry ICECHIM, Splaiul Independentei no. 202, 6th district, P.O. Box 35-174, 060021 Bucharest, Romania
      2. Faculty of Physics, University of Bucharest, 3Nano-SAE Research Centre, P.O. Box MG-38, 077125 Bucharest-Magurele, Romania
      3. Faculty of Chemistry, University of Bucharest, Bd. Regina Elisabeta 4-12, 1st district, Bucharest, Romania
      4. Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, 1-7 Polizu St., 011061, Bucharest, Romania
    • Dates

  • Bulletin of Materials Science | News

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