Geng Peng, Jiang Chengjian
State Key Laboratory of Material Processing and Die & Mold Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
Polymers (Basel). 2025 Jan 13;17(2):174. doi: 10.3390/polym17020174.
Biological surfaces with physical discontinuity or chemical heterogeneity possess special wettability in the form of anisotropic wetting behavior. However, there are several challenges in designing and manufacturing samples with anisotropic wettability. This study investigates the fabrication of PTFE/PDMS grid membranes using Direct Ink Writing (DIW) 3D printing for oil-water separation applications. The ink's rheological properties were optimized, revealing that a 60% PTFE/PDMS composite exhibited the ideal shear-thinning behavior for 3D printing. Our research investigated the interplay between various printing parameters like the extrusion air pressure, layer thickness, feed rate, and printing speed, which were found to influence the filament dimensions, pore sizes, and hydrophobic properties of the grid membrane. Two distinct grid structures were analyzed for their wettability and anisotropic hydrophobic characteristics. The grid membranes achieved up to 100% oil-water separation efficiency in specific configurations. Separation efficiency was shown to be dependent on factors like intrusion pressure, grid architecture, and the number of layers. This study underscores the potential of DIW 3D printing in creating specialized surfaces with controlled wettability, particularly superhydrophobicity and anisotropy, paving the way for advanced environmental applications such as efficient oil-water separation.
具有物理不连续性或化学异质性的生物表面呈现出各向异性润湿行为形式的特殊润湿性。然而，设计和制造具有各向异性润湿性的样品存在若干挑战。本研究探讨了使用直接墨水书写（DIW）3D打印制造聚四氟乙烯/聚二甲基硅氧烷网格膜用于油水分离应用。对墨水的流变特性进行了优化，结果表明60%的聚四氟乙烯/聚二甲基硅氧烷复合材料表现出适合3D打印的理想剪切变稀行为。我们的研究调查了诸如挤出气压、层厚、进料速度和打印速度等各种打印参数之间的相互作用，发现这些参数会影响网格膜的细丝尺寸、孔径和疏水性能。分析了两种不同的网格结构的润湿性和各向异性疏水特性。在特定配置下，网格膜实现了高达100%的油水分离效率。结果表明，分离效率取决于侵入压力、网格结构和层数等因素。本研究强调了DIW 3D打印在创建具有可控润湿性，特别是超疏水性和各向异性的特殊表面方面的潜力，为高效油水分离等先进环境应用铺平了道路。
