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自清洁仿生表面的最新研究
来源:徐坚研究员个人网站 发布日期:2005-11-03

Development of Bionic Polymer Surface with Self-cleaning Function Bionics, an artificial imitation of natural products, has always been a forever dream in the fairy tale or scientific fiction when we were in childhood. The lotus has long been extolled as the "beauty of purity" in oriental cultures, as evidenced by the lotus eulogies of Chinese poets in ancient times. The purity of the lotus is attributed to the water- and soil-repellent characteristics of its micro-nano-binary structure (MNBs) on the lotus leaf, as shown in Figure 1 A and B. Recently, such a typical bionic surface with lotus-effect?were successfully prepared by Dr. XuJian group and his colleagues, Dr. Jiang and Dr. Dong, by means of developing two one-step approaches in ambient atmosphere. In the first approach, the solution of poly(methyl methacrylate) (PMMA) and fluorine-terminated polyurethane (FPU) in DMF, which is a good solvent for PMMA but poor solvent for FPU, was cast on glass plate under ambient condition. With the evaporation of DMF, the PMMA was first deposited as micron-sized protrusions due to phase separation while the FPU was still dissolved in the polymer poor phase. After the solvent evaporated completely, FPU nanodots were decorated on the PMMA micro-papillae, shown in Figure 1 C and D. As shown in Figure 2 B and C, the contact angle of water drop and oil drop (CA) were up to 166?and 140? respectively, and the water sliding angle reaches a limiting value of 3.4?.0o. Such super-amphiphobic properties are much better than that of natural lotus (Figure 2A), which is wetted by oil. The paper is published in Advanced Materials, 2004, 16, 302?05. In the second approach, a superhydrophobic surface was simply prepared by one-step casting the micelle solution of the diblcock copolymer under ambient atmosphere. When polypropylene-polymethylmethacrylate block copolymer (PP-b-PMMA) was dispersed in a selective solvent N,N?dimethylformamide (DMF), micelles with insoluble PP as the core and soluble PMMA as the shell were formed. The diameter of single micelle was in the range of 50~200nm, while the micelle aggregates was of 1.5~2mm, as shown in Figure 3. From the enlarged view of the aggregate, the MNBs were clearly exhibited. The contact angle and sliding angle of water drops of 5ml on the rough surface of PP-b-PMMA copolymer were 160.5?.1o(Figure 3 right) and 9?.1o, respectively. The paper was published in Advanced Materials, 2004, 16, 1830-1833.

 

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