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Controlled encapsulation of hydrophobic liquids in hydrophilic polymer nanofibers by co-electrospinning

机译：通过共电纺丝控制疏水性液体在亲水性聚合物纳米纤维中的包封

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摘要

There are many technical situations, such as various biological or medical applications, in which a hydrophobic fluid must be encapsulated inside a hydrophilic polymer shell in the form of tiny microscopic pieces. A novel approach is presented, based on the co-electrospinning of the hydrophilic polymer melt (outside) and the hydrophobic fluid (inside), which results in beaded micro- and nanofibers, such that the hydrophobic fluid is efficiently encapsulated inside the beads. For the selected fluid couple, the low liquid-liquid surface tension and the high viscosity of the melt prevent the varicose break-up of inner fluid in the coaxial electrified jet until the very end of the co-electrospinning process. The resulting fibers present beads filled with the hydrophobic fluid, separated by a rather uniform distance whose length depends partially on the melt flow rate. The bead diameter grows with the inner flow rate, going from a monosized to a bisized distribution. In the case under study, the maximum relative (inner-to-outer) flow rate is one. The diameter of the solid fibers between beads scales well with existing theories for simple electrospinning.
机译：在许多技术情况下，例如各种生物学或医学应用，其中疏水流体必须以微小的微件形式封装在亲水聚合物壳内部。基于亲水性聚合物熔体（外部）和疏水性流体（内部）的共电纺丝，提出了一种新颖的方法，其导致微纤维和纳米纤维成珠状，从而疏水性流体被有效地封装在珠粒内部。对于选定的流体偶，低的液-液表面张力和高的熔体粘度可防止同轴带电射流中内部流体的静脉曲张破裂，直到共电纺丝过程的最后。所得的纤维呈现出填充有疏水性流体的珠粒，其被相当均匀的距离隔开，该距离的长度部分取决于熔体流动速率。磁珠直径随着内部流速的增加而增长，从单一尺寸分布变为双重尺寸分布。在所研究的情况下，最大相对（内部到外部）流速为一。珠粒之间的实心纤维直径与简单电纺的现有理论很好地成比例。

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