Gifted with unique optical and hydrophobic properties, the plant leaves have been recently considered as micro/ nanostructure prototypes for functional surface engineering. Imprinting bio-inspired structures onto surfaces can yield in similar functional properties than in the nature. In this article, we report on a simple and effective method to copy leaf surface structures onto poly-(methyl methacrylate) sheets. The replicated surface structures reduce optical reflectance and enhance optical haze. Besides, the artificial polymer sheets exhibit good hydrophobic properties. Correlation between optical haze and hydrophobicity was studied.
1. Barthlott, W. and Neinhuis, C. Purity of the sacred lotus, or escape from contamination in biological surfaces. Planta, 1997, 202, 1−8.
https://doi.org/10.1007/s004250050096
2. Dorrer, C. and Rühe, J. Some thoughts on superhydrophobic wetting. Soft Matter, 2009, 5, 51−61.
https://doi.org/10.1039/B811945G
3. Brodribb, T. J., Feild, T. S., and Sack, L. Viewing leaf structure and evolution from a hydraulic perspective. Funct. Plant Biol., 2010, 37, 488−498.
https://doi.org/10.1071/FP10010
4. Wang, F., Zhao, D., Guo, Z., Liu, L., Zhang, Z., and Shen, D. Artificial leaf structures as a UV detector formed by the self-assembly of ZnO nanoparticles. Nanoscale, 2013, 5, 2864−2869.
https://doi.org/10.1039/c3nr33748k
5. Scholes, G. D., Fleming, G. R., Olaya-Castro, A., and van Grondelle, R. Lessons from nature about solar light harvesting. Nature Chem., 2011, 3, 763−774.
https://doi.org/10.1038/nchem.1145
6. Huang, Z., Yang, S., Zhang, H., Zhang, M., and Cao, W. Replication of leaf surface structures for light harvesting. Sci. Rep., 2015, 5, 14281.
https://doi.org/10.1038/srep14281
7. Raut, H. K., Ganesh, V. A., Nair, A. S., and Ramakrishna, S. Anti-reflective coatings: a critical, in-depth review. Energy Environ. Sci., 2011, 4, 3779−3804.
https://doi.org/10.1039/c1ee01297e
8. Huang, Z., Shi, T., Zhang, H., Zhang, M., Huttula, M., and Cao, W. A computational study of antireflection structures bio-mimicked from leaf surface morphologies. Sol. Energy, 2016, 131, 131−137.
https://doi.org/10.1016/j.solener.2016.02.041
9. Neinhuis, C. and Barthlott, W. Characterization and distribution of water-repellent, self-cleaning plant surfaces. Ann. Bot., 1997, 79, 667−677.
https://doi.org/10.1006/anbo.1997.0400
10. Ganesh V. A., Raut, H. K., Nair, A. S., and Ramakrishna, S. A review on self-cleaning coatings. J. Mater. Chem., 2011, 21, 16304−16322.
https://doi.org/10.1039/c1jm12523k
11. Nakajima, A., Fujishima, A., Hashimoto, K., and Watanabe, T. Preparation of transparent superhydrophobic boehmite and silica films by sublimation of aluminum acetylacetonate. Adv. Mater., 1999, 11, 1365−1368.
https://doi.org/10.1002/(SICI)1521-4095(199911)11:16<1365::AID-ADMA1365>3.0.CO;2-F
12. Feng, L., Li, S., Li, Y., Li, H., Zhang, L., Zhai, J., Song, Y., Liu, B., Jiang, L., and Zhu, D. Super-hydrophobic surfaces: from natural to artificial. Adv. Mater., 2002, 14, 1857.
https://doi.org/10.1002/adma.200290020
13. Gao, X. and Jiang, L. Water-repellent legs of water striders. Nature, 2004, 432, 36.
https://doi.org/10.1038/432036a
14. Huang, Z., Cai, C., Wang, G., Zhang, H., Huttula, M., and Cao, W. Structural color model based on surface morphology of morpho butterfly wing scale. Surf. Rev. Lett., 2016, 23, 1650046.
https://doi.org/10.1142/S0218625X16500463
15. Cassie, A. B. D. and Baxter, S. Wettability of porous surfaces. Trans. Faraday Soc., 1944, 40, 546.
https://doi.org/10.1039/tf9444000546
16. Chandler, D. Interfaces and the driving force of hydrophobic assembly. Nature, 2005, 437, 640−647.
https://doi.org/10.1038/nature04162
17. Sun, T., Feng, L., Gao, X., and Jiang, L. Bioinspired surfaces with special wettability. Acc. Chem. Res., 2005, 38, 644.
https://doi.org/10.1021/ar040224c
18. Chen, Y., Li, F., Cao, W., and Li, T. Preparation of recyclable CdS photocatalytic and superhydrophobic films with photostability by using a screen-printing technique. J. Mater. Chem. A, 2015, 3, 16934–16940.
https://doi.org/10.1039/C5TA04065E
https://doi.org/10.1016/j.jallcom.2017.05.327