Correlating hydrophobicity to surface chemistry of microstructured aluminium surfaces
Correlating hydrophobicity to surface chemistry of microstructured aluminium surfaces
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DOI：
10.1016/j.apsusc.2020.148574
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发表时间：
2021-03
影响因子：
6.7
通讯作者：
L. Savio;K. B. Bhavitha;G. Bracco;G. Luciano;D. Cavallo;G. Paolini;S. Passaglia;G. Carraro;L. Vattuone;R. Masini;M. Smerieri
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文献类型：
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作者：
L. Savio;K. B. Bhavitha;G. Bracco;G. Luciano;D. Cavallo;G. Paolini;S. Passaglia;G. Carraro;L. Vattuone;R. Masini;M. Smerieri
通过接触角测角法、扫描电子显微镜和 X 射线光电子能谱对通过化学蚀刻制造的高度疏水性铝表面进行研究，以便将样品的润湿性与其亚微米尺度的形态以及第一表面层的化学成分相关联。我们发现蚀刻的铝表面具有具有纳米级块状凸面和中空的二元结构，这为空气捕获提供了更多的空间。我们还证明，分层微/纳米结构和表面组成赋予这些表面优异的疏水性能。 XPS 分析确实表明接触角与表面存在的金属铝的量反相关，但也证实了吸附空气中碳化合物的重要作用。因此，疏水行为取决于表面形态和表面化学的综合影响。
Highly hydrophobic aluminium surfaces fabricated by chemical etching are investigated by Contact Angle Goniometry, Scanning Electron Microscopy and X-ray Photoelectron Spectroscopy in order to correlate the wettability of our samples with their morphology at the sub-micrometer scale and with the chemical composition of the very first surface layers. We find that the etched aluminium surfaces have binary structures with nanoscale block-like convexities and hollows, which provide more space for air trapping. We also demonstrate that both hierarchical micro/nanostructures and surface composition endow these surfaces with excellent hydrophobic properties. XPS analysis shows indeed that the contact angle anti-correlates with the amount of metallic aluminium present at the surface, but also confirms the essential role of the adsorption of airborne carbon compounds. The hydrophobic behaviour depends therefore on the combined effects of surface morphology and surface chemistry.