School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.
J Colloid Interface Sci. 2011 Oct 15;362(2):629-32. doi: 10.1016/j.jcis.2010.12.015. Epub 2010 Dec 13.
Polyethylene films were prepared with phase separation at lower temperatures. The wettability of such films varied from hydrophobicity to superhydrophobicity as the processing temperature decreased owing to the increase of surface roughness. Storing the as-prepared films at subzero temperature (-15 °C), it was found that the water contact angle of the film decreased obviously, and the decrease depended on the corresponding roughness. Further keeping the as-prepared films at room temperature for 30 min, the water contact angle would return to the normal value, which indicated that the reversible switching of surface wettability can be controlled by the environmental temperature.
采用低温相分离法制备聚乙烯薄膜。由于表面粗糙度的增加，随着处理温度的降低，薄膜的润湿性从疏水性变为超疏水性。将制备好的薄膜储存在零下温度（-15°C）下，发现薄膜的水接触角明显降低，且降低程度取决于相应的粗糙度。进一步将制备好的薄膜在室温下保持 30 分钟，水接触角将恢复到正常值，这表明表面润湿性的可逆切换可以通过环境温度来控制。
