Key Laboratory of Textile Science & Technology, Ministry of Education, College of Textiles, Donghua University, No. 2999 North Renmin Road, Songjiang, Shanghai 201620, China.
Nanoscale Res Lett. 2014 Jul 14;9(1):350. doi: 10.1186/1556-276X-9-350. eCollection 2014.
In this study, we have successfully fabricated electrospun polystyrene (PS) nanofibers having a diameter of 326 ± 50 nm with a parallel grooved texture using a mixed solvent of tetrahydrofuran (THF) and N,N-dimethylformamide (DMF). We discovered that solvent system, solution concentration, and relative humidity were the three key factors to the formation of grooved texture and the diameter of nanofibers. We demonstrated that grooved nanofibers with desired properties (e.g., different numbers of grooves, widths between two adjacent grooves, and depths of grooves) could be electrospun under certain conditions. When THF/DMF ratio was higher than 2:1, the formation mechanism of single grooved texture should be attributed to the formation of voids on the jet surface at the early stage of electrospinning and subsequent elongation and solidification of the voids into a line surface structure. When THF/DMF ratio was 1:1, the formation mechanism of grooved texture should be ascribed to the formation of wrinkled surface on the jet surface at the early stage of electrospinning and subsequent elongation into a grooved texture. Such findings can serve as guidelines for the preparation of grooved nanofibers with desired secondary morphology.
在这项研究中，我们成功地使用四氢呋喃（THF）和 N,N-二甲基甲酰胺（DMF）的混合溶剂制备了具有 326±50nm 直径的平行沟槽纹理的电纺聚苯乙烯（PS）纳米纤维。我们发现溶剂体系、溶液浓度和相对湿度是形成沟槽纹理和纳米纤维直径的三个关键因素。我们证明，在一定条件下可以电纺出具有所需性能（例如，不同数量的沟槽、相邻沟槽之间的宽度和沟槽的深度）的沟槽纳米纤维。当 THF/DMF 比例高于 2:1 时，单沟槽纹理的形成机制应该归因于在静电纺丝的早期阶段在射流表面上形成空隙，以及随后空隙的伸长和固化成线状表面结构。当 THF/DMF 比例为 1:1 时，沟槽纹理的形成机制应该归因于在静电纺丝的早期阶段在射流表面上形成皱纹表面，以及随后伸长成沟槽纹理。这些发现可以为制备具有所需二次形态的沟槽纳米纤维提供指导。
