This work demonstrates an improved route to develop low-cost and robust isoporous polyvinylidene fluoride (PVDF) nanomembranes for industrial separation and purifications processes. The 4-step process excels at making uniform 100 nm and 20 nm pore membranes that exhibit high flux in both dead-end and cross-flow filtration. Our tests demonstrate that 90–100% rejection rates could be achieved in these membranes for perfluorooctanoic acid, sulfamethoxazole, bovine serum albumin, and SARS-COV-2 in high-concentration aqueous solutions. The membranes are nominally 50 μm thick and retain structural integrity, exhibiting high tensile strengths of 8.56 MPa and 8.31 MPa, respectively, due to improved routes to β crystalline formations of the PVDF. Our useful fabrication procedure is compatible with developed technologies that can quickly expand the opportunities of isoporous PVDF for processing of advanced materials and devices.

这项工作展示了一种改进的路线，可以开发用于工业分离和纯化过程的低成本且坚固的等孔聚偏二氟乙烯 (PVDF) 纳米膜。4 步工艺擅长制作均匀的 100 nm 和 20 nm 孔膜，在死端和错流过滤中均表现出高通量。我们的测试表明，这些膜对高浓度水溶液中的全氟辛酸、磺胺甲恶唑、牛血清白蛋白和 SARS-COV-2 的排斥率可以达到 90-100%。由于改进了 PVDF β 晶形形成的途径，膜的标称厚度为 50 μm，并保持结构完整性，分别表现出 8.56 MPa 和 8.31 MPa 的高拉伸强度。