Contact Angle Hysteresis on Graphene Surfaces and Hysteresis-free Behavior on Oil-infused Graphite Surfaces

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题名:	Contact Angle Hysteresis on Graphene Surfaces and Hysteresis-free Behavior on Oil-infused Graphite Surfaces
作者:	曹恆光;Wu, Cyuan-Jhang;Li, Yueh-Feng;Woon, Wei-Yen;Sheng, Yu-Jane;Tsao, Heng-Kwong
贡献者:	工學院化學工程與材料工程學系
关键词:	Chemical vapor deposition;Contact angle;Graphene;Graphite;Hysteresis;Polished;Roughness;Wetting
日期:	2016-11-01
上传时间:	2026-04-21 14:56:43 (UTC+8)
出版者:	Elsevier;Elsevier B.V
摘要:	摘要： [Display omitted] •Contact angle hysteresis(CAH) on four graphitic surfacesisinvestigated.•The hysteresis loopof water drops on the polished graphite sheetshowsparticularly small receding contact angle.•The significant CAH observed on CVD graphene and highly oriented pyrolytic graphite is attributed mainly to adhesion hysteresis.•An oil-infused surface of a graphite sheet is produced by imbibition of hexadecane into its porous structure.•The hysteresis-free property for water drops on such a surface is examined and quantitatively explained. Contact angle hysteresis (CAH) on graphitic surfaces, including chemical vapor deposition (CVD) graphene, reduced electrophoretic deposition (EPD) graphene, highly oriented pyrolytic graphite (HOPG), and polished graphite sheet, has been investigated. The hysteresis loops of water drops on the first three samples are similar but the receding contact angle is particularly small for the polished graphite sheet.The significant CAH observed on CVD graphene and HOPG associated with atom-scale roughness has to be attributed mainly to adhesion hysteresis (surface relaxation), instead of roughness or defects.The difference of the wetting behavior among those four graphitic samples has been further demonstrated by hexadecane drops. On the surface of HOPG or CVD graphene,the contact line expands continuously with time, indicating total wetting for which the contact angle does not exist and contact line pinning disappears. In contrast, on the surface of reduced EPD graphene, spontaneous spreading is halted by spikes on it and partial wetting with small contact angle (θ≈4°) is obtained. On the surface of polished graphite sheet, the superlipophilicity and porous structure are demonstrated by imbibition and capillary rise of hexadecane. Consequently, an oil-infused graphite surface can be fabricated and the ultralow CAH of water (∆θ≈2°) is achieved. 出版者： Elsevier B.V 出版日期： 2016-11-01 出處： Applied surface science, 2016-11, Vol.385, p.153-161 版權： 2016 Elsevier B.V. 識別號： ISSN: 0169-4332 識別號： EISSN: 1873-5584 識別號： DOI: 10.1016/j.apsusc.2016.05.059
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