%0 Journal Article %1 citeulike:8309578 %A Rahmawan, Yudi %A Moon, Myoung-Woon %A Kim, Kyung-Suk %A Lee, Kwang-Ryeol %A Suh, Kahp-Yang %D 2010 %J Langmuir %K pdms 82b24-equilibrium-interface-problems-diffusion-limited-aggregation 82d60-structure-of-matter-polymers %N 1 %P 484--491 %R 10.1021/la902129k %T Wrinkled, Dual-Scale Structures of Diamond-Like Carbon (DLC) for Superhydrophobicity %U http://dx.doi.org/10.1021/la902129k %V 26 %X We present a simple two-step method to fabricate dual-scale superhydrophobic surfaces by using replica molding of poly(dimethylsiloxane) (PDMS) micropillars, followed by deposition of a thin, hard coating layer of a SiOx-incorporated diamond-like carbon (DLC). The resulting surface consists of microscale PDMS pillars covered by nanoscale wrinkles that are induced by residual compressive stress of the DLC coating and a difference in elastic moduli between DLC and PDMS without any external stretching or thermal contraction on the PDMS substrate. We show that the surface exhibits superhydrophobic properties with a static contact angle over 160o for micropillar spacing ratios (interpillar gap divided by diameter) less than 4. A transition of the wetting angle to approximately 130o occurs for larger spacing ratios, changing the wetting from a Cassie−Cassie state (Cm-Cn) to a Wenzel−Cassie state (Wm-Cn), where m and n denote micro- and nanoscale roughness, respectively. The robust superhydrophobicity of the Cassie−Cassie state is attributed to stability of the Cassie state on the nanoscale wrinkle structures of the hydrophobic DLC coating, which is further explained by a simple mathematical theory on wetting states with decoupling of nano- and microscale roughness in dual scale structures.

@article{citeulike:8309578, abstract = {{We present a simple two-step method to fabricate dual-scale superhydrophobic surfaces by using replica molding of poly(dimethylsiloxane) (PDMS) micropillars, followed by deposition of a thin, hard coating layer of a SiOx-incorporated diamond-like carbon (DLC). The resulting surface consists of microscale PDMS pillars covered by nanoscale wrinkles that are induced by residual compressive stress of the DLC coating and a difference in elastic moduli between DLC and PDMS without any external stretching or thermal contraction on the PDMS substrate. We show that the surface exhibits superhydrophobic properties with a static contact angle over 160o for micropillar spacing ratios (interpillar gap divided by diameter) less than 4. A transition of the wetting angle to approximately 130o occurs for larger spacing ratios, changing the wetting from a Cassie−Cassie state (Cm-Cn) to a Wenzel−Cassie state (Wm-Cn), where m and n denote micro- and nanoscale roughness, respectively. The robust superhydrophobicity of the Cassie−Cassie state is attributed to stability of the Cassie state on the nanoscale wrinkle structures of the hydrophobic DLC coating, which is further explained by a simple mathematical theory on wetting states with decoupling of nano- and microscale roughness in dual scale structures.}}, added-at = {2017-06-29T07:13:07.000+0200}, author = {Rahmawan, Yudi and Moon, Myoung-Woon and Kim, Kyung-Suk and Lee, Kwang-Ryeol and Suh, Kahp-Yang}, biburl = {https://www.bibsonomy.org/bibtex/2492594e6b46d0e67441f7b6528c093c9/gdmcbain}, citeulike-article-id = {8309578}, citeulike-attachment-1 = {00000019la902129k.pdf; /pdf/user/gdmcbain/article/8309578/578203/00000019la902129k.pdf; 4afb81d55dea0d0857c911c52c718ee25d952cea}, citeulike-linkout-0 = {http://dx.doi.org/10.1021/la902129k}, citeulike-linkout-1 = {http://pubs.acs.org/doi/abs/10.1021/la902129k}, comment = {(private-note)circulated by SGM 2010-11-23}, day = 5, doi = {10.1021/la902129k}, file = {00000019la902129k.pdf}, interhash = {9c4c0e148a433863e4ab5be3e363db50}, intrahash = {492594e6b46d0e67441f7b6528c093c9}, journal = {Langmuir}, keywords = {pdms 82b24-equilibrium-interface-problems-diffusion-limited-aggregation 82d60-structure-of-matter-polymers}, month = jan, number = 1, pages = {484--491}, posted-at = {2010-11-26 03:55:37}, priority = {2}, timestamp = {2020-04-24T08:26:47.000+0200}, title = {Wrinkled, Dual-Scale Structures of Diamond-Like Carbon ({DLC}) for Superhydrophobicity}, url = {http://dx.doi.org/10.1021/la902129k}, volume = 26, year = 2010 }