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Effects of trace organic contamination on micro–nanostructure-induced superhydrophobic properties

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Abstract

Superhydrophobicity has been a crucial research topic due to its ability to make surfaces stay dry and self-clean. Low-surface-energy organic coatings are widely used to fabricate superhydrophobic surfaces by modifying surface groups and minimizing surface energy. Considering defects would seriously undermine these coatings, which would further lead to hydrophobicity dwindling and lifetime decreasing, researchers have begun to investigate the development of superhydrophobic surfaces without organic coatings. However, it is still controversial whether these superhydrophobic surfaces are really free of organic substances with low surface energy. In this work, O3 bombardment was utilized to construct micro–nanostructures on aluminum foil. The aluminum foil surface turns to superhydrophobic after ozone bombardment with the contact angle (CAs) increasing from 20° to 161°. Results showed the presence of silicon contaminations on alumina surfaces despite the fact that no organic coatings are utilized in the fabrication process. The transition of hydrophilic-to-superhydrophobic was attributed to both surface morphology and silicon contamination from pump oil. Our work reveals that trace organic contamination from pump oil is a key factor that cannot be ignored in scenarios with vacuum pump use, which could provide some favorable evidence to figure out the controversial issue mentioned above.

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The data that support the findings of this study are available from the corresponding author upon reasonable request.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Granted no. 51777152), the Natural Science Foundation of Shaanxi Province (Granted no. 2021JZ-01), and the Postdoctoral Science Foundation of China (Granted no. 2020M683465). The authors thank Mr. Ren at the Instrument Analysis Center of Xi’an Jiaotong University for his assistance with SEM measurement. The authors thank Ms. Liang of Xi’an Jiaotong University for her assistance with the mechanism study.

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  1. Engineering Research Center of Energy Storage Materials and Devices, Ministry of Education, School of Chemistry, Xi’an Jiaotong University, Xi’an, 710049, China

    Zhuo Li, Zhongshuai Liang, Xianfeng Du, Zhengying Zhang & Lilong Xiong

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Conceptualization, ZL, XD, LX; methodology, ZL, ZL; investigation, ZL, ZZ; writing—original draft, ZL; writing—review and editing, ZL, XD, LX; funding acquisition, XD, ZL. All authors have read and agreed to the published version of the manuscript.

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Li, Z., Liang, Z., Du, X. et al. Effects of trace organic contamination on micro–nanostructure-induced superhydrophobic properties. Appl. Phys. A 129, 432 (2023). https://doi.org/10.1007/s00339-023-06712-z

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