Cheng Yin, Suhonen Heikki, Helfen Lukas, Li Junsheng, Xu Feng, Grunze Michael, Levkin Pavel A, Baumbach Tilo
Institute for Photon Science and Synchrotron Radiation (IPS), Karlsruhe Institute of Technology (KIT), D-76344 Karlsruhe, Germany.
Soft Matter. 2014 May 7;10(17):2982-90. doi: 10.1039/c3sm52604f.
We report three-dimensional (3D) direct imaging of complex surface-liquid interfaces by hard X-ray phase contrast tomography as a non-destructive approach for the morphological characterization of surfaces at the micro- and nanoscale in contact with water. Specifically, we apply this method to study the solid-air-water interface in hydrophobic macroporous polymethacrylate surfaces, and the solid-oil-water interface in slippery liquid-infused porous surfaces (SLIPS). Varying the isotropic spatial resolution allows the 3D quantitative characterization of individual polymer globules, globular clusters (porosity) as well as the infused lubricant layer on SLIPS. Surface defects were resolved at the globular level. We show the first application of X-ray nanotomography to hydrated surface characterizations and we anticipate that X-ray nanoscale imaging will open new ways for various surface/interface studies.
我们报告了通过硬X射线相衬断层扫描对复杂的表面-液体界面进行三维（3D）直接成像，这是一种用于对与水接触的微米和纳米尺度表面进行形态表征的非破坏性方法。具体而言，我们应用此方法研究疏水性大孔聚甲基丙烯酸酯表面的固-气-水界面，以及光滑液体注入多孔表面（SLIPS）中的固-油-水界面。改变各向同性空间分辨率可对单个聚合物球粒、球状聚集体（孔隙率）以及SLIPS上注入的润滑层进行3D定量表征。表面缺陷在球粒水平上得以分辨。我们展示了X射线纳米断层扫描在水合表面表征中的首次应用，并且预计X射线纳米尺度成像将为各种表面/界面研究开辟新途径。
