Department of Chemistry and Materials Science Aalto University School of Chemical Engineering, Espoo, Finland.
Brigham and Women's Hospital, Harvard Medical School, Cambridge, MA, 02139, USA.
Sci Rep. 2017 Nov 22;7(1):16019. doi: 10.1038/s41598-017-16369-3.
A top-down scalable method to produce flexible water and blood repellent tubes is introduced. The method is based on replication of overhanging nanostructures from an aluminum tube template to polydimethylsiloxane (PDMS) via atomic layer deposition (ALD) assisted sacrificial etching. The nanostructured PDMS/titania tubes are superhydrophobic with water contact angles 163 ± 1° (advancing) and 157 ± 1° (receding) without any further coating. Droplets are able to slide through a 4 mm (inner diameter) tube with low sliding angles of less than 10° for a 35 µL droplet. The superhydrophobic tube shows up to 5,000 times increase in acceleration of a sliding droplet compared to a control tube depending on the inclination angle. Compared to a free falling droplet, the superhydrophobic tube reduced the acceleration by only 38.55%, as compared to a 99.99% reduction for a control tube. The superhydrophobic tubes are blood repellent. Blood droplets (35 µL) roll through the tubes at 15° sliding angles without leaving a bloodstain. The tube surface is resistant to adhesion of activated platelets unlike planar control titania and smooth PDMS surfaces.
介绍了一种自上而下的可扩展方法来制备具有弹性的拒水和拒血管状结构。该方法基于通过原子层沉积（ALD）辅助牺牲蚀刻从铝管模板复制悬垂纳米结构到聚二甲基硅氧烷（PDMS）。具有纳米结构的 PDMS/二氧化钛管具有超疏水性，水接触角为 163±1°（前进）和 157±1°（后退），无需进一步涂覆。液滴能够以小于 10°的低滑动角通过内径为 4mm 的管滑动，对于 35µL 的液滴，滑动角小于 10°。与对照管相比，超疏水管的滑动液滴的加速度增加了 5000 倍，这取决于倾斜角。与自由落体的液滴相比，超疏水管仅将加速度降低了 38.55%，而对照管的加速度降低了 99.99%。超疏水管还具有抗血液污染的特性。血液液滴（35µL）以 15°的滑动角度滚过管而不会留下血迹。与平面对照的二氧化钛和光滑的 PDMS 表面相比，管表面不易粘附激活的血小板。
