Bacterial Retention on Superhydrophobic Titanium Surfaces Fabricated by Femtosecond Laser Ablation
Bacterial Retention on Superhydrophobic Titanium Surfaces Fabricated by Femtosecond Laser Ablation
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DOI：
10.1021/la104607g
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发表时间：
2011-03-15
期刊：
影响因子：
3.9
通讯作者：
Ivanova, Elena P.
中科院分区：
文献类型：
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作者：
Fadeeva, Elena;Truong, Vi Khanh;Ivanova, Elena P.
利用飞秒激光烧蚀技术在钛表面制备了双层微米级和纳米级准周期自组织结构，模拟了荷叶表面。第一层由10至20 μ m大小的大颗粒状凸起特征组成。第二层存在于这些颗粒的表面上，其中存在200 nm（或更小）宽的不规则起伏。仿生表面图案的引入显著地改变了钛表面的表面润湿性。原始表面具有θ（W）73 +/-3度的水接触角，而激光处理的钛表面变得超疏水，具有θ（W）166 +/-4度的水接触角。研究了S.金黄色葡萄球菌和铜绿假单胞菌在表面-液体界面处具有这些超疏水表面，揭示了对两种病原菌的高度选择性保留模式。整个S。金黄色葡萄球菌细胞能够成功地定殖在超疏水性钛表面上，没有铜绿假单胞菌细胞能够附着在表面上（即，任何附着的细菌细胞低于估计的检测下限）。
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 mu m 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 wettability of the titanium surface. The original surface possessed a water contact angle of theta(W) 73 +/- 3 degrees, whereas the laser treated titanium surface became superhydrophobic, With a water contact angle of theta(W) 166 +/- 4 degrees. 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. Whole 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).