Dynamics and morphology development in electrospun fibers driven by concentration sweeps
Dynamics and morphology development in electrospun fibers driven by concentration sweeps
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DOI：
10.1063/1.2800277
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发表时间：
2007-10
影响因子：
4.6
通讯作者：
P. Dayal;T. Kyu
中科院分区：
文献类型：
--
作者：
P. Dayal;T. Kyu
本文描述了静电纺丝过程动力学的建模和模拟，以及浓度扫描驱动的纤维形态的时空演化。静电纺丝过程基于圆柱壳中麦克斯韦元件连接的珠子阵列进行建模，以描述射流表面库仑力和粘弹性力之间的力平衡。通过结合液-液分层的 Flory-Huggins 自由能以及通过纤维表面的溶剂蒸发，在 Cahn-Hilliard 时间演化方程的框架内计算了相分离动力学。基于这两个过程耦合的模拟揭示了原位形态发展，记录了所有结构形成过程，例如聚合物液滴、互连旋节线结构和沿自旋线的多孔结构。模拟的多孔纤维与实验结果惊人地相似。
The present article describes the modeling and simulation of the dynamics of the electrospinning process coupled with the spatio-temporal evolution of fiber morphology driven by concentration sweeps. The electrospinning process has been modeled based on an array of beads connected by Maxwell’s elements in a cylindrical shell to describe the force balance between Coulombic and viscoelastic forces at the surface of the jet. The phase separation dynamics has been calculated in the framework of the Cahn-Hilliard time-evolution equation by incorporating Flory-Huggins free energy for liquid-liquid demixing in conjunction with solvent evaporation through the fiber surface. The simulations based on the coupling of these two processes have revealed in situ morphology development registering all structural forming processes such as polymer droplets, interconnected spinodal structure, and the porous structure along the spinline. The simulated porous fiber shows a striking resemblance to the experimental finding.