期刊
BULLETIN OF MATERIALS SCIENCE
卷 37, 期 1, 页码 107-115出版社
INDIAN ACAD SCIENCES
DOI: 10.1007/s12034-014-0628-7
关键词
Hydrophobic surfaces; silica hybrids; sol-gel process; hydrophobic silica; coatings
资金
- strategic grant [POS-DRU/89/1.5/S/58852]
- European Social Fund within the Sectorial Operational Program Human Resources Development
- Romanian National Authority for Scientific Research, CNDI-UEFISCDI [3.2-1391]
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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