Fabrication of Super-Oil-Repellent Dual Pillar Surfaces with Optimized Pillar Intervals
Fabrication of Super-Oil-Repellent Dual Pillar Surfaces with Optimized Pillar Intervals
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DOI：
10.1021/la202487v
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发表时间：
2011-10-04
期刊：
影响因子：
3.9
通讯作者：
Habazaki, Hiroki
中科院分区：
文献类型：
--
作者：
Fujii, Takashi;Aoki, Yoshitaka;Habazaki, Hiroki
采用c斜角磁控溅射沉积Al-Nb合金及其阳极氧化工艺制备了具有优化柱间距的分级双柱表面。柱间隔由用于斜角沉积的扇形基底的沉积角度和单元尺寸控制。沉积的柱表面的阳极氧化形成纳米柱氧化物层，产生分层双柱表面。在涂覆氟烷基磷酸盐层以降低表面自由能之后，具有亚微米柱间隔大于400 nm的分级表面即使对于具有27.5 mN m（-1）的低表面张力的十六烷也显示出超液体排斥性，尽管具有较小亚微米柱间隔且没有纳米柱的亚微米柱表面不是超油排斥性。相比之下，双柱表面显示超疏水性，无论亚微米柱间隔。因此，本研究证明了柱间距（柱之间的间隙大小）对实现超疏油性的重要性。
Hierarchical dual pillar surfaces with optimized pillar intervals are fabricated by a novel combined process of the c oblique angle magnetron sputtering deposition of Al-Nb alloys and their anodizing. The pillar intervals are controlled by the deposition angle and cell size of a scalloped substrate for oblique angle deposition. Anodizing of the deposited pillar surfaces develops a nanopillar oxide layer, producing the hierarchical dual pillar surfaces. After being coated with a fluoroalkyl phosphate layer to reduce the surface free energy, hierarchical surfaces with submicrometer pillar intervals greater than 400 nm show super liquid repellency even for hexadecane with a low surface tension of 27.5 mN m(-1), although the submicrometer pillar surfaces with smaller submicrometer pillar intervals and without nanopillars were not super-oil-repellent. In contrast, the dual pillar surfaces show superhydrophobicity regardless of the submicrometer pillar intervals. Thus, the present study demonstrates the importance of the pillar intervals (gap size between pillars) to realize the superoleophobicity.