Kunz Clemens, Müller Frank A, Gräf Stephan
Otto Schott Institute of Materials Research (OSIM), Friedrich Schiller University Jena, Löbdergraben 32, 07743 Jena, Germany.
Materials (Basel). 2018 May 12;11(5):789. doi: 10.3390/ma11050789.
Hierarchical surface structures were fabricated on fused silica by using a fs-laser with a pulse duration = 300 fs and a wavelength = 512 nm. The resulting surface structures were characterized by scanning electron microscopy, atomic force microscopy and white light interference microscopy. The optical properties were analyzed by transmittance measurements using an integrating sphere and the wettability was evaluated by measuring the water contact angle . The silanization of structured fused silica surfaces with trichloro(1H,1H,2H,2H-perfluorooctyl)silane allows to switch the wettability from superhydrophilic ( = 0°) to superhydrophobic behavior with exceeding 150°. It was shown that the structured silica surfaces are a suitable master for negative replica casting and that the hierarchical structures can be transferred to polystyrene. The transmittance of structured fused silica surfaces decreases only slightly when compared to unstructured surfaces, which results in high transparency of the structured samples. Our findings facilitate the fabrication of transparent glass samples with tailored wettability. This might be of particular interest for applications in the fields of optics, microfluidics, and biomaterials.
通过使用脉冲持续时间为300 fs、波长为512 nm的飞秒激光在熔融石英上制备了分级表面结构。通过扫描电子显微镜、原子力显微镜和白光干涉显微镜对所得表面结构进行了表征。使用积分球通过透射率测量分析光学性质，并通过测量水接触角评估润湿性。用三氯(1H,1H,2H,2H-全氟辛基)硅烷对结构化熔融石英表面进行硅烷化处理，可以将润湿性从超亲水（θ = 0°）转变为超疏水行为（θ超过150°）。结果表明，结构化二氧化硅表面是用于负性复制铸造的合适母模，并且分级结构可以转移到聚苯乙烯上。与非结构化表面相比，结构化熔融石英表面的透射率仅略有降低，这导致结构化样品具有高透明度。我们的研究结果有助于制备具有定制润湿性的透明玻璃样品。这对于光学、微流体和生物材料领域的应用可能特别有意义。
