摘要
运用原子力显微镜研究了十八烷基三氯硅烷在玻璃表面自组装形成单分子膜的过程 .通过对样品表面的显微图像、表面平均粗糙度及前进接触角的测量分析 ,揭示了自组装单分子膜在玻璃表面的生长规律 。
By using AFM, the process of the OTS monolayer formation on glass substrate surface by self assembly from 1×10 -3 mol/L OTS toluene solution at 18 ℃ was revealed. The analyses of AFM images as well as the surface mean roughness R a of the sample surfaces indicated that, after 15 min reaction a smooth OTS monolayer with a R a of 0.156 nm/4 μm 2 could be obtained on the glass surface. However, this freshly formed OTS monolayer was unstable, as the reaction proceeds, the R a of the monolayer would slightly increase within the succeeding 15 min, and finally keep a constant value about 0.170 nm/4 μm 2 even for 2 h reaction. The advancing contact angle measurement showed that after ~15 min reaction, a completely hydrophobic surface formed with an advancing contact angle of 105°. Our research also showed that during the initial reaction period, most of the adsorption molecules just adsorbed on the substrate surface physically. But some kinds of very strong combination between a few of adsorption molecules and the substrate surface was established, which was much stronger than physical interaction.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2000年第8期1257-1260,共4页
Chemical Journal of Chinese Universities
基金
国家教育部留学归国人员科研启动基金
关键词
自组装单分子膜
原子力显微镜
OTS
玻璃表面
Octadecyltrichlorosilane(OTS)
Self assembled monolayer
Atomic force microscope(AFM)