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首页> 外文会议>Materials Research Society Symposium on Structure, Processing, and Properties of Polymer Nanofibers for Emerging Technologies >Electrical Bending and Mechanical Buckling Instabilities in Electrospinning Jets
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Electrical Bending and Mechanical Buckling Instabilities in Electrospinning Jets

机译：静电纺丝夹具中的电气弯曲和机械屈曲稳定性

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The determination of the behavior of the jet path in the vicinity of the onset of the primary electrical bending instability is important for the orderly collection of the nanofibers produced by electrospinning. A stable jet was observed with a high frame rate, short exposure time video camera. The collection process was complicated but predictable within limits, so the design and creation of some two or three dimensional structures of nanofibers is feasible, if the considerations described below are incorporated into the design and production processes. The fluid jet in the straight segment of the path, and the more solid nanofibers in the coils of the primary electrical bending instability were collected on stationary and moving surfaces. The diameter and characteristic path of the jet depended on the exact distance between the orifice and the collector, if other parameters were not changed. The moving surfaces caused the various coils that were collected to be displaced rather than superimposed. The fiber collected on the moving surfaces preserved a record of the electrical and mechanical instabilities that occurred. If the straight segment was very fluid, the jet formed a series of small sessile drops on the collector, but when the jet was more solid, buckling occurred and produced small, complicated loops close to point at which the jet hit the surface. Buckling was observed during collection of the straight segment and the first coils of the electrically driven electrical bending instability. A moving inclined collector was used to collect the fibers. Surface velocities were up to about 5 meters per second. These velocities are commensurate with the velocities at which the solidifying jet approached the surface, A variety of structures of loops, both conglutinated and not, associated with the instabilities were created. The jets used in this work were formed from solutions of polyethylene oxide, nylon-6, poly lactic acid, and other polymers. Several solvents were used for some of the polymers, and details of the jet path changed when the solvent or the concentration changed. The jets issued from a pendent drop on a glass capillary with an orifice diameter of about 160 microns. A potential difference in the range of 500 to 13,000 volts was applied between the orifice and the collector. The distance from the orifice to the grounded collector varied from 1 mm to 30 cm. Interference colors associated with jet diameters around 10 microns were observed in the straight segment. The color patterns were stable, indicating that the process variations were small.
机译：确定初级电弯曲不稳定性发作附近的射流路径的行为对于通过静电纺丝产生的纳米纤维的有序收集是重要的。用高帧速率，短曝光时间摄像机观察到稳定的射流。如果下面描述的考虑结合到设计和生产过程中，则收集过程在限制内具有复杂但可预测的纳米纤维的结构和创建是可行的。在路径的直线段中的流体射流，并且在固定的和移动表面上收集初级电弯曲不稳定性的线圈中的更坚固的纳米纤维。射流的直径和特征路径依赖于孔口和收集器之间的精确距离，如果没有改变其他参数。移动表面导致收集的各种线圈被移位而不是叠加。收集在移动表面上的纤维保留了发生的电气和机械稳定性的记录。如果直线段是非常流体的，喷射器在收集器上形成了一系列小型柄液滴，但是当射流更加坚固时，发生屈曲并产生小，复杂的回路接近射流撞击表面的点。在集合直线段和电动电动弯曲不稳定性的第一线圈期间观察弯曲。移动倾斜收集器用于收集纤维。表面速度每秒高达约5米。这些速度与凝固射流接近表面的速度相称，创建了与不稳定性相关的凝固件的各种环状结构。该工作中使用的喷气机由聚环氧乙烷，尼龙-6，聚乳酸和其他聚合物的溶液形成。几种溶剂用于一些聚合物，并且当溶剂或浓度改变时，射流的细节变化。从玻璃毛细管上的悬垂液滴发出的喷气机，孔口直径为约160微米。在孔口和收集器之间施加500至13,000伏的潜在差。从孔到接地收集器的距离变化为1mm至30cm。在直线段中观察到与射流直径相关的干涉颜色约为10微米。颜色图案稳定，表明过程变化很小。

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