| 초록 |
This work reports the preparation of hydrophobic mesoporous silica particles (MSPs) modified with non-fluorinated alkyl silanes. Alkyl silanes were grafted onto the surface of the MSPs as a function of the length of non-fluorinated alkyl chains such as propyl-triethoxysilane (C3), octyl-triethoxysilane (C8), dodecyl-triethoxysilane (C12), and octadecyl-triethoxysilane (C18). The contact angles of the alkyl silane-modified MSPs were increased as a function of the alkyl chain lengths in the order of C18 ＞ C12 ＞ C8 ＞ C3 and the contact angle of C18-modified MSPs was 4 times wider than that of unmodified MSPs. Furthermore, the hydrophobicity of the non-fluorinated alkyl silane-modified MSPs was also demonstrated by the adsorption of hydrophobic lecithin compound, and showed the increase of lecithin adsorption as a function of the alkyl chain lengths due to the hydrophobic interaction. The solid-state 29Si-MAS NMR was used to analyze the silane modification on MSPs at different temperature (25 ℃, 40 ℃). Consequently, hydrophobic modification on MSPs surface using non-fluorinated alkyl silanes was best preferred in a protic solvent, with a reaction time of ~ 24 h at 25 ℃, and at a high concentration of silanes. |
