A novel method to fabricate organic-free superhydrophobic surface on titanium substrates by removal of surface hydroxyl groups
A novel method to fabricate organic-free superhydrophobic surface on titanium substrates by removal of surface hydroxyl groups
复制标题
一种通过去除表面羟基在钛基底上制备无有机物超疏水表面的新方法
DOI：
10.1016/j.apsusc.2019.02.162
复制
发表时间：
2019-06
影响因子：
6.7
通讯作者：
Weidong Tian
中科院分区：
文献类型：
--
作者：
Hao Wu;Li Xie;Ruitao Zhang;Yuan Tian;Suru Liu;Min He;Chao Huang;Weidong Tian
钛及其合金在生物医学领域有着广泛的应用，其表面润湿性在其应用过程中起着重要作用。特别是，具有水接触角（WCA）> 150°的超疏水表面受到极大关注，并且现在在生物医学竞技场中发现越来越多的使用。目前，在钛表面制备超疏水表面时，大多会引入表面自由能较低的有机物，影响钛表面的固有化学成分，长时间暴露会面临降解的风险。但是在钛基体上制备超疏水表面却显得相当困难，目前的研究报道较少。本文采用阳极氧化、H2 O2氧化和时效处理的新方法成功制备了超疏水Ti表面（WCA = 151.9°）。在该过程中，没有引入具有低SFE的外部有机物。然后对所制备的样品的表面形貌和粗糙度、三维形貌、润湿性、晶体结构和化学成分进行了表征。所制备的TiO 2涂层表面具有多孔结构，表面粗糙度Ra约为1.21 μm，表面有大量的凹坑结构。结果表明，碳氢化合物的吸附和羟基的减少共同改变了Ti表面的润湿性，其中H2 O2去除羟基和老化处理起着关键作用。结果表明，表面微观粗糙度和固有润湿性下降是超疏水性形成的主要原因。该方法在不改变Ti/TiO 2表面本征性质的前提下实现了超疏水性，在生物医学领域具有广阔的应用前景。
Titanium (Ti) and its alloys have been extensively used for biomedical applications and surface wettability makes large differences during their applications. Especially, superhydrophobic surfaces with water contact angle (WCA) > 150° are under great interest and are now finding increased use in the biomedical arena. Up to now, most fabrication of superhydrophobic surface on Ti substrates would introduce external organics with low surface free energy (SFE), which could influence the intrinsic chemical components of Ti surface and face the risk of degradation when exposed for a long time. But it seems quite difficult to achieve superhydrophobic surfaces on Ti substrates without organic coating and few researches have been reported. Herein, a superhydrophobic Ti surface (WCA = 151.9°) was successfully fabricated by a novel method including anodization, H2O2and aging treatment. During this procedure, no external organics with low SFE were introduced. Then surface topography and roughness, 3D morphology, wettability, crystalline structure and chemical components of the as-prepared samples were characterized. The as-prepared surface was coated with a TiO2layer, and exhibited a porous morphology with numbers of crater structures with roughness value (Ra) about 1.21 μm. It was found the absorption of hydrocarbon and decrease of hydroxyl (OH) groups together changed the intrinsic wettability of Ti surface, where the removal of OH groups by H2O2and aging treatment played a critical role. The results indicated that surface micro-roughness and declined intrinsic wettability were responsible for the formation of superhydrophobicity. This novel method could achieve superhydrophobicity without changing the intrinsic properties of Ti/TiO2surface and would have great potential in biomedical applications.
登录
查看更多内容
影响因子：
14
作者：
Park, Jung Hwa;Wasilewski, Christine E.;Almodovar, Noelia;Olivares-Navarrete, Rene;Boyan, Barbara D.;Tannenbaum, Rina;Schwartz, Zvi
通讯作者：
Schwartz, Zvi
影响因子：
6.7
作者：
Jiang, J. Y.;Xu, J. L.;Liu, H. Y.
通讯作者：
Liu, H. Y.
影响因子：
3.7
作者：
Akshay, V. R.;Arun, B.;Vasundhara, M.
通讯作者：
Vasundhara, M.
影响因子：
9.7
作者：
Kang, Byung-Soo;Sul, Young-Taeg;Albrektsson, Tomas
通讯作者：
Albrektsson, Tomas
影响因子：
5.3
作者：
Jiang, Shaohong;Li, Yang;Li, Yongdan
通讯作者：
Li, Yongdan