Laser Zentrum Hannover e.V., Hollerithallee 8, D-30419 Hannover, Germany.
Langmuir. 2011 Mar 15;27(6):3012-9. doi: 10.1021/la104607g. Epub 2011 Feb 2.
Two-tier micro- and nanoscale quasi-periodic self-organized structures, mimicking the surface of a lotus Nelumbo nucifera leaf, were fabricated on titanium surfaces using femtosecond laser ablation. The first tier consisted of large grainlike convex features between 10 and 20 μm in size. The second tier existed on the surface of these grains, where 200 nm (or less) wide irregular undulations were present. The introduction of the biomimetic surface patterns significantly transformed the surface wettabilty of the titanium surface. The original surface possessed a water contact angle of θ(W) 73 ± 3°, whereas the laser-treated titanium surface became superhydrophobic, with a water contact angle of θ(W) 166 ± 4°. Investigations of the interaction of S. aureus and P. aeruginosa with these superhydrophobic surfaces at the surface-liquid interface revealed a highly selective retention pattern for two pathogenic bacteria. While S. aureus cells were able to successfully colonize the superhydrophobic titanium surfaces, no P. aeruginosa cells were able to attach to the surface (i.e., any attached bacterial cells were below the estimated lower detection limit).
采用飞秒激光烧蚀技术在钛表面制备了双层微纳准周期自组织结构，模拟了荷花（Nelumbo nucifera）叶表面。第一级由 10 到 20 微米大小的大颗粒状凸起组成。第二级存在于这些颗粒的表面，存在 200nm（或更小）宽的不规则波纹。仿生表面图案的引入显著改变了钛表面的润湿性。原始表面的水接触角为θ（W）73 ± 3°，而经过激光处理的钛表面变得超疏水，水接触角为θ（W）166 ± 4°。在表面-液体界面处，研究了金黄色葡萄球菌和铜绿假单胞菌与这些超疏水表面的相互作用，发现两种致病菌具有高度选择性的保留模式。虽然金黄色葡萄球菌细胞能够成功定殖于超疏水钛表面，但铜绿假单胞菌细胞无法附着于表面（即，任何附着的细菌细胞都低于估计的最低检测限）。
