超疏水性聚二甲基硅氧烷膜的制备及其表面吸附性研究

采用简单的激光刻蚀方法制备了具有类“菜花”状多级结构的粗糙聚二甲基硅氧烷(PDMS)膜, 并用CCD与高敏感性微电力学天平观察和测量PDMS表面对水的吸附情况. 结果表明, 该膜表面具有超疏水性, 同时对水滴具有超低的吸附力. 还对其表面特殊多级结构产生的机理进行了分析, 并探讨了在化学组成和表面结构对超疏水性以及吸附性产生的影响.

Preparation of Super-hydrophobic PDMS Films and Study on Surface Adhesion

Cabbage-like polydimethysiliconalkly(PDMS) films were prepared via a laser cutting method. The as-prepared special “micro-submicro-nano structures” PDMS films have a very low adhesive force to water. The force is merely about 6.5 μN, and appears at the time just before the water droplet leaves the surface. The super-low adhesive force of rough PDMS surface results from the distinct decrease of the real contact area between the surface and water drop. The sliding feature is strongly affected by microstructure of surface. That rough structure induced on the surface of PDMS is due to the thermo-reaction of laser with transparent elastomer. This information is useful for the designing of bio-mimetic hydrophobic surface structure for various applications. These surfaces may provide very effective water-repellent and anti-adhesive properties against particular contamination. Such properties can greatly extend its applications to many other areas such as lost less liquid transportation without loss, and micro-pump(creating pushing-force) needless micro-fluidic devices etc..