静电纺丝失稳起始的亚ms动力学
Sub-ms dynamics of the instability onset of electrospinning
摘要：
首次以每秒10，000帧的超高速率对电纺聚合物射流进行成像，研究过程动力学以及空间中的不稳定传播速度和位移。系统地改变聚合物浓度、外加偏压和针-收集器距离，并分析了它们对不稳定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，以及它在开始时的指数增长，表现出10^3 s^-1量级的径向增长率。允许的构象和聚合物溶液的演变进行深入研究，在亚毫秒级的高速成像显示出显着的潜力，提高带电射流的基础知识，导致获得精细可控的弯曲和溶液拉伸静电纺丝，从而更好地设计纳米纤维的形态和结构。
英文摘要：
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 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 sub-ms scale shows a significant potential for improving the fundamental knowledge of electrified jets, leading to obtain finely controllable bending and solution stretching in electrospinning, and consequently better designed nanofibers morphologies and structures.
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