Knowledge Resource Center for Ecological Environment in Arid Area
| Morphology-driven superhydrophobic polystyrene webs: fabrication and characterization | |
| Yuan;Yue | |
| 出版年 | 2016 |
| 学位授予单位 | Kansas State University |
| 英文摘要 | Master of Science Department of Apparel, Textiles, and Interior Design Jooyoun Kim Seong-O Choi Superhydrophobicity (water contact angle, WCA >150˚) can be achieved by introducing surface roughness and decreasing surface energy. Polystyrene (PS) electrospun web can be used as an excellent substrate for superhydrophobic surface due to its low surface energy (~33 mN/m) and processibility to form various roughness. As the Cassie-Baxter model explains, the presence of roughness amplifies anti-wettability of materials whose surface energy is low (hydrophobic, WCA >90˚). This study aims to fabricate superhydrophobic PS nonwoven webs by electrospinning process and vapor deposition of 1H,1H,2H,2H-perfluorodecyltrichlorosilane (PFDTS) and to investigate the influence of fiber morphology and surface energy on wettability. To this end, PS webs with various fiber morphologies were electrospun under different polymer concentrations and solvent mixtures. PS substrates were treated by air plasma to attach –OH groups before the vapor deposition of PFDTS. Air plasma treatment itself increased the surface energy of PS; however, with PFDTS coating, the surface energy was decreased. The wettability was characterized by WCA and sliding angle measurement. WCAs on the electrospun webs were greater than that of flat PS film (WCA=95˚) due to the increased roughness of the web. The web with beads or grooved fibers achieved superhydrophobicity (WCA>150˚). PFDTS deposition lowered the surface energy of PS surface to about 15.8 mN/m. PS web with PFDTS deposition presented high water contact angle up to 169˚ and low sliding angle about 3˚. Also it was attempted to characterize the interfacial area between water and a solid surface on irregular fibrous webs. The fraction of solid surface area wet by the liquid (solid fraction) was observed by staining the rough electrospun web with a hydrophobic fluorescent dye, coumarin. The actual solid fraction corresponded fairly well with the theoretical solid fraction calculated by the Cassie-Baxter equation, demonstrating that the treated superhydrophobic surface follows the Cassie-Baxter wetting state. |
| 英文关键词 | Electrospinning Superhydrophobic Polystyrene Surface energy Fiber morphology Solid area fraction |
| 语种 | 英语 |
| URL | http://hdl.handle.net/2097/32893 |
| 来源机构 | Kansas State University |
| 资源类型 | 学位论文 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/250095 |
| 推荐引用方式 GB/T 7714 | Yuan;Yue. Morphology-driven superhydrophobic polystyrene webs: fabrication and characterization[D]. Kansas State University,2016. |
| 条目包含的文件 | 条目无相关文件。 | |||||
| 个性服务 |
| 推荐该条目 |
| 保存到收藏夹 |
| 导出为Endnote文件 |
| 谷歌学术 |
| 谷歌学术中相似的文章 |
| [Yuan;Yue]的文章 |
| 百度学术 |
| 百度学术中相似的文章 |
| [Yuan;Yue]的文章 |
| 必应学术 |
| 必应学术中相似的文章 |
| [Yuan;Yue]的文章 |
| 相关权益政策 |
| 暂无数据 |
| 收藏/分享 |
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。
