高深宽比柔性微米纤维阵列制造及稳定性研究

摘要

To solve the fabrication problems of flexible microfibers with high aspect ratio,we proposed a method to recover the collapsed microfibers and improve the stability of the recovered microfibers by reducing the surface energy of collapsed microfibers with fluroresin treatment.By this way,the large-scale fabrication of high aspect ratio microfibers with low cost and high stability can be realized.Through the analysis on the mechanical model,the critical conditions of ground collapse and the lateral collapse were obtained.In addition,the relationship of the two was investigated in detail.Under the unsteady state,the microfibers would tend to ground collapse rather than lateral collapse.The experimental results showed that the collapsed microfibers treated by low-surface-energy fluroresin will spring back to their original upright position (high aspect ratio 10) by the treatment of ultrasonic-assisted vibration.%针对高深宽比柔性微米纤维阵列的制造难点,提出了一种利用氟树脂降低纤维表面能结合超声波辅助的方法,以实现高深宽比柔性微米纤维阵列的大面积和低成本制造.利用数学模型研究了纤维贴地倾倒和侧向倾倒的发生条件,在不稳定的情况下,相比于侧向倾倒,高深宽比柔性纤维更易于贴地倾倒,并结合稳定性分析结果进行了相关实验验证.结果表明:通过具有更低表面能的氟树脂对已成型的高深宽比柔性纤维进行表面处理,可有效降低纤维表面能;对于倾倒的高深宽比纤维进行氟树脂表面处理,并辅之以超声振动,能够使得倾倒的纤维恢复到直立状态,当纤维直径为10 μm时,其临界稳定深宽比为15.91,提高了纤维的稳定性,实现了直径为10 μm、深宽比为10的柔性微米纤维阵列的制造,且制造出的高深宽比柔性纤维具有高度稳定性.