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.
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This work was supported by the strategic grant POSDRU/89/1.5/S/58852, Project “Postdoctoral programme for training scientific researchers” cofinanced by the European Social Fund within the Sectoral Operational Program Human Resources Development 2007–2013.
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PURCAR, V., CINTEZA, O., GHIUREA, M. et al. Influence of hydrophobic characteristic of organo-modified precursor on wettability of silica film. Bull Mater Sci 37, 107–115 (2014). https://doi.org/10.1007/s12034-014-0628-7
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DOI: https://doi.org/10.1007/s12034-014-0628-7