How Swelling, Cross-Linking, and Aging Affect Drop Pinning on Lubricant-Infused, Low Modulus Elastomers
How Swelling, Cross-Linking, and Aging Affect Drop Pinning on Lubricant-Infused, Low Modulus Elastomers
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DOI：
10.1021/acsapm.1c01455
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发表时间：
2022-01
影响因子：
5
通讯作者：
Zhuoyun Cai;Jonathan T. Pham
中科院分区：
文献类型：
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作者：
Zhuoyun Cai;Jonathan T. Pham
柔软、光滑的表面因其广泛的潜在应用而受到越来越多的关注，例如在生物材料、自清洁、防污、液体收集等方面。制备柔软、光滑表面的一种方法是用润滑剂溶胀交联聚合物网络。然而，对于低模量弹性体，对溶胀和交联如何与光滑性能相关的理解仍然不充分。我们研究了水滴在垂直的硅油溶胀聚二甲基硅氧烷 (PDMS) 弹性体上粘附或滑动的情况，作为交联度和溶胀度的函数。我们的结果表明，滑动所需的临界水滴体积很大程度上受膨胀程度控制；较高的膨胀导致较低的临界滴体积。此外，我们还证明，高度膨胀的表面（而不是轻度膨胀的表面）在用水冲洗后的老化过程中会恢复其光滑行为。这可能与来自本体基材的表面油层的再生有关，这说明了润滑剂溶胀弹性体在实际应用中的耐久性。
Soft, slippery surfaces have gained increasing attention because of their wide range of potential applications, for example in biomaterials, self-cleaning, antifouling, liquid collection, and more. One approach to prepare a soft, slippery surface is by swelling a cross-linked polymer network with a lubricant. However, an understanding of how swelling and cross-linking relate to slippery properties is still underdeveloped for low modulus elastomers. We study when a water drop sticks or slides on a vertical, silicone oil-swollen polydimethylsiloxane (PDMS) elastomer as a function of the degree of cross-linking and the degree of swelling. Our results indicate that the critical water drop volume required for sliding is strongly controlled by the degree of swelling; higher swelling leads to lower critical drop volumes. In addition, we demonstrate that highly swollen surfaces, and not lightly swollen surfaces, recover their slippery behavior during an aging process after they are rinsed with water. This is likely associated with regeneration of an oil-layer on the surface coming from the bulk substrate, illustrating the durability of lubricant-swollen elastomers for practical uses.