Abstract
Normally, atmospheric air plasma is usually utilized to hydrophilize the substrate surface. In this paper, a facile and fast method is reported to prepare hierarchical superhydrophobic surface via atmospheric air dielectric barrier discharge (DBD) with sealed discharge zone. Siloxane monomers along with silica nanoparticles were used to construct micro-scale hierarchical morphology in gas phase. It is verified that the water repellency of sample could be regulated through adjusting volume and air humidity of discharge zone. The generated reactive oxygen species induced polymerization of long-chain alkyl silane and also caused the grafting of polar groups on substrate surface. Within 5 min, the long-chain alkyl silane coating could rapidly wrap silica nanoparticles layer-by-layer to form microspheres and hence the micro-scale hierarchical morphology. The discharge zone with appropriate sealing volume could balance the grafting amount of polar and nonpolar groups to optimize surface hydrophobicity. After repeating the plasma treatment three times, the sample possessed superhydrophobicity and excellent performance in water-in-oil emulsion separation. The study may offer an environment-friendly method to prepare water-repellent materials for industrial applications.
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The data that support the findings of this study are available on request from the corresponding author.
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Funding supports of this work from National Natural Science Foundation of China (12202299), Natural Science Foundation of Jiangsu Province (BK20210738), and the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD) are gratefully acknowledged.
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Author contributionsXiujin Li: Visualization, Investigation, Formal analysis.Shuai Liu: Validation, Software, Writing - Original Draft, Writing - Review & Editing, Methodology, Conceptualization, Supervision, Funding acquisition.Deqi Liu: Conceptualization, Methodology.Ming Lei: Validation, Formal analysis, Visualization.
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11090_2024_10463_MOESM1_ESM.docx
Supplementary Material 1. Details on images of AADBD treatment system, W/O emulsion separation system and water droplets and oil droplets on treated filter papers, FTIR and XPS survey spectra of treated filter papers, SEM images of treated sample, W/O emulsion separation performance, and table of discharge parameters for different discharge volumes and experimental parameters for AADBD.
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Li, X., Liu, S., Liu, D. et al. Fast Cross-scale Preparation of Water-repellent Hierarchical Surface via Atmospheric air Plasma for Water-in-oil Emulsion Separation. Plasma Chem Plasma Process 44, 821–836 (2024). https://doi.org/10.1007/s11090-024-10463-x
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DOI: https://doi.org/10.1007/s11090-024-10463-x