Montinaro Martina, Fasano Vito, Moffa Maria, Camposeo Andrea, Persano Luana, Lauricella Marco, Succi Sauro, Pisignano Dario
Dipartimento di Matematica e Fisica "Ennio De Giorgi", Università del Salento, via Arnesano, I-73100 Lecce, Italy.
Soft Matter. 2015 May 7;11(17):3424-31. doi: 10.1039/c4sm02708f.
Electrospun polymer jets are imaged for the first time at an ultra-high rate of 10,000 frames per second, investigating the process dynamics, and the instability propagation velocity and displacement in space. The polymer concentration, applied voltage bias and needle-collector distance are systematically varied, and their influence on the instability propagation velocity and on the jet angular fluctuations is analyzed. This allows us to unveil the instability formation and cycling behavior, and its exponential growth at the onset, exhibiting radial growth rates of the order of 10(3) s(-1). Allowing the conformation and evolution of polymeric solutions to be studied in depth, high-speed imaging at the sub-ms scale shows significant potential for improving the fundamental knowledge of electrified jets, leading to finely controllable bending and solution stretching in electrospinning, and consequently better designed nanofiber morphologies and structures.
首次以每秒10000帧的超高帧率对静电纺丝聚合物射流进行成像，研究其过程动力学以及不稳定性传播速度和空间位移。系统地改变聚合物浓度、施加的电压偏置和针-收集器距离，并分析它们对不稳定性传播速度和射流角度波动的影响。这使我们能够揭示不稳定性的形成和循环行为，以及其在起始时的指数增长，呈现出约10(3) s(-1) 的径向增长率。亚毫秒级的高速成像能够深入研究聚合物溶液的构象和演化，显示出在提高对带电射流的基础知识方面具有巨大潜力，从而实现静电纺丝中精细可控的弯曲和溶液拉伸，进而设计出更好的纳米纤维形态和结构。
