Superhydro-oleophobic bio-inspired polydimethylsiloxane micropillared surface via FDTS coating/blending approaches
Superhydro-oleophobic bio-inspired polydimethylsiloxane micropillared surface via FDTS coating/blending approaches
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DOI：
10.1016/j.apsusc.2014.10.146
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发表时间：
2015-01-01
影响因子：
6.7
通讯作者：
Zhao, Boxin
中科院分区：
文献类型：
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作者：
Pan, Zihe;Shahsavan, Hamed;Zhao, Boxin
在这项工作中，我们通过仿生微柱表面和氟硅烷聚合物三氯(1H,1H,2H,2H-全氟辛基)硅烷(FDTS)的化学改性，赋予聚二甲基硅氧烷(PDMS)弹性体表面超疏水疏油特性。在平板和微柱 PDMS 上应用了两种不同的化学改性方法：(1) 在固化的 PDMS 表面上气相沉积 FDTS，以及 (2) 在固化前将 FDTS 与液体 PDMS 前体混合。对纯 PDMS 和 FDTS 改性 PDMS（平面和微柱）的水和油接触角的比较研究表明，超疏水疏油性是通过 FDTS 化学和微柱几何形状的组合实现的。 FDTS 混合的 PDMS 微柱表现出更好的疏油性，与 FDTS 涂层的 PDMS 微柱（接近 151 度）相比，油接触角接近 141 度。与 FDTS 共混 PDMS 微柱的光滑表面相比，FDTS 涂覆的微柱表面因气相沉积过程而导致表面粗糙，并存在一些结构缺陷；表面缺陷可能是导致 FDTS 涂层 PDMS 微柱疏油性较低的原因。发现 FDTS 混合的 PDMS 微柱在水接触角方面的超疏水性与 FDTS 的量无关。然而，发现 FDTS 混合的 PDMS 微柱的疏油性取决于 FDTS 的数量；随着PDMS中FDTS重量浓度的增加，油接触角首先增加，然后在有限浓度下趋于平稳。应用 FTIR 和 XPS 分析表面化学信息，表明混合 FDTS 与本体 PDMS 分离并在表面富集以降低表面张力，从而使表面超疏油。 (C) 2014 Elsevier B.V. 保留所有权利。
In this work we render superhydro-oleophobic properties to the surface of polydimethylsiloxane (PDMS) elastomer through bio-inspired micropillar surface and chemical modification with a fluorosilane polymer, trichloro(1H,1H,2H,2H-perfluorooctyl)silane (FDTS). Two different chemical modification approaches were applied on both flat and micropillar PDMS: (1) vapor deposition of FDTS on cured PDMS surface, and (2) blending FDTS with the liquid PDMS precursor before curing. Comparative studies of the water and oil contact angles on the neat and FDTS-modified PDMS (both flat and micropillar) indicated that superhydro-oleophobicity was delivered by a combination of FDTS chemistry and micropillar geometry. FDTS-blended PDMS micropillar displayed better oleophobicity with an oil contact angle of similar to 141 degrees than FDTS-coated PDMS micropillar (similar to 151 degrees). In contrast to the smooth surface of FDTS-blended PDMS micropillar, rough surface with some structure defects were found on the FDTS-coated micropillar surface caused by the vapor deposition process; the surface defects might be responsible for the observed low oleophobicity of FDTS-coated PDMS micropillar. Superhydrophobicity of FDTS-blended PDMS micropillar in terms of water contact angles was found to be independent of the quantity of FDTS. However, the oleophobicity of FDTS-blended PDMS micropillar was found to be dependent of the quantity of FDTS; with the increased weight concentration of FDTS in PDMS, the oils contact angle first increased and then leveled out at a finite concentration. FTIR and XPS were applied to analyze surface chemistry information suggesting the blended FDTS segregated from bulk PDMS and enriched at the surface to reduce surface tension so as to make surface super-oleophobic. (C) 2014 Elsevier B.V. All rights reserved.