采用分子自组装技术在羟基化的玻璃基片表面成功制备了十八烷基三氯硅烷单层膜 (OTS-SAMs).运用接触角测试仪测定了水在自组装薄膜表面的接触角;用原子力显微镜(AFM)分析了OTS-SAMs的表面形貌,并对经过紫外线照射改性的OTS-SAMs薄膜表面进行分析.结果表明:该组装膜具有很好的疏水性,其对水的接触角高达105°;在组装初期2 min内,十八烷基三氯硅烷水解产物主要是与基体表面的羟基发生聚合反应,表现为岛状物结构团簇,随着组装时间的增加,基体表面的有机硅烷分子之间发生聚合反应,当组装15 min后,成膜过程趋于稳定,可以在基体表面形成平整致密的自组装薄膜;经过紫外线照射改性后的薄膜表面亲水性明显提高,在2 h时达到了很好的羟基化效果.
The octadecyltrichlorosilane (OTS) monolayers on hydroxylated glass substrates was prepared by self-assembled technique in this experiment. The water contact angle of self-assembled monolayers was measured with contact angle tester. The atomic force microscope (AFM) was used to study the morphology of OTS-SAMs and the surface modification of OTS-SAMs via UV radiation technique. The results indicated that the OTS-SAMs had excellent hydrophobic and its water contact angle is as high as 105°, that within 2 minutes, the hydrolytic of octadecyltrichlorosilane mainly has the polyreaction with the hydroxy on substrate surface, OTS-SAMs has been formed on whole substrate with an "island" growth mode and 15 minutes later, the formation of OTS-SAMs goes stable with the layers smooth and dense. The hydroxy of its surface via UV radiation technique increased sizably and the surface reaches a good effect of hydroxylation within 2 h.
参考文献
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