据华东理工大学新闻网2018年8月29日讯 超疏油表面能够排斥各种表面张力的液体，因此在自清洁、防腐蚀和液体分离等领域中具有重要应用。目前，超疏油表面主要通过低表面能固体和多重凹型微结构制备得到。然而，这些超疏油表面仍具有较大固液接触面积，对液滴表现出较大的粘附力。
近日，《先进材料》以“Superoleophobic Slippery Liquid-Infused Surface: Combining Two Extremes in the Same Surface”（https://doi.org/10.1002/adma.201803890. IF=21.95；Figure 1-2）为题，报道了华东理工大学许振良教授课题组联合培养博士生董哲勤（联合培养单位：Karlsruhe Institute of Technology, Germany）在3D打印光滑型超疏油表面的研究工作。该文利用3D 激光直写技术制备得到了具有纳米粗糙度和多重凹型结构的微柱阵列，通过将润滑液灌注到微柱表面的纳米结构中获得了光滑型超疏油表面。液滴接触角和粘附力测量结果表明，该表面不仅能够对各种表面张力的液体表现出高于150°的前进角和小于10°的滚动角，且对液滴表现出了更低的粘附力。该新型表面集超疏油性和超光滑性于一身，对于制备低粘附、防冰冻、抗污染的超疏水或超疏油膜表面有着十分重要理论指导与实际应用的意义。
| Figure 1. (A) Schemes showing a liquid on a hydrophobic, superhydrophobic, slippery and slippery superhydrophobic surface with different contact interfaces. (B) Blueprint for a slippery superoleophobic surface via combination of a doubly re-entrant structure and a slippery liquid-infused porous surface. |
| Figure 2. SEM images of doubly re-entrant micropillars with flat and nanopillared (nanorough) tops. (A) 45° view of doubly re-entrant micropillars with the flat top. The insert picture shows a 6 μL ethanol drop deposited on a surface composed of the doubly re-entrant micropillars with static contact angle of 158 ±5°. (B) 45° view of doubly re-entrant micropillars with nanorough top. (C) Cross-sectional view of doubly re-entrant micropillars with nanorough top. Key geometric parameters: D, P and H are the diameter, pitch (center to center) and height of the doubly re-entrant micropillars, respectively. δ and t are the length and thickness of the vertical overhang, respectively. d, p and h are the diameter, pitch (center to center) and height of the nanopillars, respectively. D=25 μm, P=100 μm, H=50 μm, δ=4.0 μm, t=250 nm, d=400 nm, p=750 nm, h=1.0 μm. |
Figure 3 FAS grafted electrospun PVA nanofiber membranes
华东理工大学许振良教授课题组主要研究领域为新材料、资源环境、海水淡化等方面，研究方向为中空纤维膜/平板膜及其复合膜、膜材料与微介孔材料、催化精馏膜结构填料、超高净电子化学品、膜强化过程、分离集成技术处理三废等。该文第一作者董哲勤2012年7月获华东理工大学化学工程与工艺专业学士学位后师从许振良教授， 2015年3月提前攻读华东理工大学化学工程专业博士学位， 2016年8月赴德国参加与Karlsruhe Institute of Technology联合培养博士项目。董哲勤在许振良教授指导下，已发表了4篇超疏水膜和海水膜蒸馏第一作者SCI论文(他引合计123次)如下: 1、FAS grafted electrospun polyvinylalcohol nanofiber membranes with robust superhydrophobicity for membrane distillation. ACS Appl. Mater. Interfaces, 2015, 7(40):22652-22659 (Figure 3，IF=8.097，他引21次)；2、A self-cleaning TiO2 coated mesh with robust underwater superoleophobicity for oil/water separation in complex environment. RSC Advances, 2016, 6(51):65171-65178(IF=2.936，他引5次。)；3、Superhydrophobic modification of PVDF-SiO2 electrospun nanofibrous membranes for vacuum membrane distillation. RSC Advances, 2015, 5:67962–67970(IF=2.936，他引20次)；4、Superhydrophobic PVDF-PTFE electrospun nanofibrous membranes for desalination by vacuum membrane distillation. Desalination, 2014, 347:175-183(IF=6.603，他引57次)。
