Abstract
The water droplets spread observation, contact angle measurement and SEM analysis, data processing and other means, comparative study of different states of the lotus leaf, rice leaf and nasturtium leaf are carried out. The results show that their surface contact angle of three kinds of plant leaves are all over 140°, they have hydrophobic or superhydrophobic properties; dehydration degree of leaves has little effect on the wettability, will not change its hydrophobic property; the same point of wettability is that they have micro nano composite microstructure. The difference is, the wettability of the lotus and nasturtium is isotropic, while the rice is anisotropic, that is, in a direction parallel to the edge of hydrophobic than perpendicular to the blade edge enhancement. Based on the theoretical research, the hydrophobic surface is copied to the surface of aluminum alloy. The superhydrophobic surface of aluminum alloy matrix was successfully prepared by chemical etching combined with surface fluorination. The super hydrophobic aluminum alloy surface has micron-nano scale double roughness structure; its surface contact angle reached 156°.
Highlights
After billions of years of evolution, natural creatures have acquired near perfect structure and strong environmental adaptability [1]
If the contact angle of water drop on solid surface is greater than 150 °, it is called super hydrophobic surface [5], lotus leaves are super hydrophobic
Water droplets in each direction is free rolling on the surface, it is easy to assemble a big drop, so super hydrophobic characteristic of lotus leaf surface with isotropic and strong catchment characteristics
Summary
After billions of years of evolution, natural creatures have acquired near perfect structure and strong environmental adaptability [1]. The water drops from the lotus leaves can carry away the dust, so the lotus leaves have "self-cleaning" characteristics. In 1977, William Barthlott first named the self-cleaning phenomenon known as the "lotus leaf effect" (Lotus- effect)" [2]. It contains profound scientific principles—“Infiltrative” [3,4]. The superhydrophobic mechanism and the similarities and differences of lotus leaf, rice and nasturtium are not reported
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