Superhydrophobicity due to the hierarchical scale roughness of PDMS surfaces

被引:232
作者
Cortese, Barbara [1 ]
D'Amone, Stefania [1 ]
Manca, Michele [1 ]
Viola, Ilenia [1 ]
Cingolani, Roberto [1 ]
Gigli, Giuseppe [1 ]
机构
[1] Univ Salento, CNR, INFM, NNL,Dist Technol, I-73100 Lecce, Italy
关键词
D O I
10.1021/la702764x
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Wettability control has been widely investigated in the last decades for technological applications such as microfluidic devices and self-cleaning surfaces by modifying both the chemical composition and the geometric structure of the surfaces. Inspired by the typical morphology of superhydrophobic leaves (such as lotus leaves), we have developed a dual-scale roughness, micro- and nanosized, on polydimethylsiloxane (PDMS) surfaces. By combining different geometric parameters and plasma treatment conditions, the structures were controlled hierarchically, at different independent length scales. Both the microsized replicated pillars and the nanosized etched posts tuned the wettability of the PDMS surfaces in a very simple way, up to contact angles of 170 degrees. Furthermore, changes in the influence of micro- and nanoscale geometrical structures were investigated. Hysteresis and contact angles of water droplets are evaluated as a combined effect of micropillars and a superimposed roughness, resulting in high advancing contact angles and low sliding angles.
引用
收藏
页码:2712 / 2718
页数:7
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