Tailoring Anisotropic Wetting Properties on Submicrometer-Scale Periodic Grooved Surfaces

被引:76
作者
Xia, Deying [1 ,2 ]
He, Xiang [1 ,2 ]
Jiang, Ying-Bing [3 ]
Lopez, Gabriel P. [4 ,5 ]
Brueck, S. R. J. [1 ,2 ]
机构
[1] Univ New Mexico, Ctr High Technol Mat, Albuquerque, NM 87106 USA
[2] Univ New Mexico, Dept Elect & Comp Engn, Albuquerque, NM 87106 USA
[3] Univ New Mexico, Ctr Microengineered Mat, Albuquerque, NM 87131 USA
[4] Univ New Mexico, Ctr Biomed Engn, Albuquerque, NM 87131 USA
[5] Univ New Mexico, Dept Chem & Nucl Engn, Albuquerque, NM 87131 USA
基金
美国国家科学基金会;
关键词
SUPERHYDROPHOBIC SURFACES; WETTABILITY; HYDROPHOBICITY; ADHESION; BEHAVIOR;
D O I
10.1021/la904505n
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The use of simple plasma treatments and polymer deposition to tailor the anisotropic wetting properties of one-dimensional (1D) submicrometer-scale grooved surfaces, fabricated using interferometric lithography in photoresist polymer films, is reported. Strongly anisotropic wetting phenomena are observed for as-prepared 1D grooved Surfaces for both positive and negative photoresists. Low-pressure plasma treatments with different gas compositions (e.g., CHF3, CF4, O-2) are employed to tailor the anisotropic wetting properties from strongly anisotropic and hydrophobic to hydrophobic with very high contact angle and superhydrophilic with a smaller degree of wetting anisotropy and without changing the structural anisotropy. The change of the surface wetting properties for these 1D patterned surfaces is attributed to a change in surface chemical composition, monitored using XPS. In addition, the initial anisotropic wetting properties on 1D patterned samples Could be modified by coating plasma treated samples with a thin layer of polymer. We also demonstrated that the wetting properties of 1D grooved surfaces in a Si substrate Could be tuned with similar plasma treatments. The ability to tailor anisotropic wetting oil 1D patterned Surfaces will find many applications in microfluidic devices, lab-on-a-chip systems, microreactors, and self-cleaning surfaces.
引用
收藏
页码:2700 / 2706
页数:7
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