Slepička Petr, Slepičková Kasálková Nikola, Fajstavr Dominik, Frýdlová Bára, Sajdl Petr, Kolská Zdeňka, Švorčík Václav
Department of Solid State Engineering, The University of Chemistry and Technology Prague, Technická 3, 166 28 Prague, Czech Republic.
Department of Power Engineering, The University of Chemistry and Technology Prague, 166 28 Prague, Czech Republic.
Materials (Basel). 2023 Jun 9;16(12):4280. doi: 10.3390/ma16124280.
This study is focused on polytetrafluoroethylene (PTFE) porous nanotextile and its modification with thin, silver sputtered nanolayers, combined with a subsequent modification with an excimer laser. The KrF excimer laser was set to single-shot pulse mode. Subsequently, the physico chemical properties, morphology, surface chemistry, and wettability were determined. Minor effects of the excimer laser on the pristine PTFE substrate were described, but significant changes were observed after the application of the excimer laser to the polytetrafluoroethylene with sputtered silver, where the formation of a silver nanoparticles/PTFE/Ag composite was described, with a wettability similar to that of a superhydrophobic surface. Both scanning electron microscopy and atomic force microscopy revealed the formation of superposed globular structures on the polytetrafluoroethylene lamellar primary structure, which was also confirmed using energy dispersive spectroscopy. The combined changes in the surface morphology, chemistry, and thus wettability induced a significant change in the PTFE's antibacterial properties. Samples coated with silver and further treated with the excimer laser 150 mJ/cm inhibited 100% of the bacterial strain . The motivation of this study was to find a material with flexible and elastic properties and a hydrophobic character, with antibacterial properties that could be enhanced with silver nanoparticles, but hydrophobic properties that would be maintained. These properties can be used in different types of applications, mainly in tissue engineering and the medicinal industry, where water-repellent materials may play important roles. This synergy was achieved via the technique we proposed, and even when the Ag nanostructures were prepared, the high hydrophobicity of the system Ag-polytetrafluorethylene was maintained.
本研究聚焦于聚四氟乙烯（PTFE）多孔纳米织物及其用溅射银的薄纳米层进行的改性，并结合随后的准分子激光改性。KrF准分子激光设置为单脉冲模式。随后，测定了其物理化学性质、形态、表面化学和润湿性。描述了准分子激光对原始PTFE基材的微小影响，但在对准分子激光应用于溅射银的聚四氟乙烯后观察到了显著变化，其中描述了银纳米颗粒/PTFE/Ag复合材料的形成，其润湿性类似于超疏水表面。扫描电子显微镜和原子力显微镜均揭示了在聚四氟乙烯层状初级结构上形成了叠加的球状结构，这也通过能量色散光谱得到了证实。表面形态、化学性质以及由此导致的润湿性的综合变化引起了PTFE抗菌性能的显著变化。涂有银并进一步用150 mJ/cm的准分子激光处理的样品抑制了100%的细菌菌株。本研究的目的是找到一种具有柔性和弹性特性以及疏水性的材料，其抗菌性能可以通过银纳米颗粒增强，但疏水性得以保持。这些特性可用于不同类型的应用，主要是在组织工程和医药行业，其中疏水材料可能发挥重要作用。这种协同作用是通过我们提出的技术实现的，即使制备了Ag纳米结构，Ag - 聚四氟乙烯体系的高疏水性仍得以保持。
