有序排列電紡奈米纖維的方型滾輪收集方法

Abstract

纖維是現今奈米科技中最備受矚目的先進材料之一，電紡則是有效製作連續性高分子纖維的主要技術，其纖維尺度範圍可在幾奈米至微米之間；而電紡的主要優點便是在於設備簡單、操作容易與成本低廉，以及可製作尺度均勻且連續的奈米纖維。 本實驗目的在使用方型體代替圓筒型的滾輪，採用滾輪可連續收集有序排列奈米纖維的方法，再將有序排列的纖維使用交疊的方式，期望使不同層的纖維之間能呈現90度的交疊情形；如此，便可得到十字排列的奈米纖維所形成的薄膜。 在使用方型滾輪收集有序排列電紡奈米纖維的實驗結果中，發現收集距離是最主要影響纖維排列效果的因素，而收集距離主要便是影響著電紡鞭甩運動的鞭甩幅度大小，在較短的收集距離下纖維可以有越好的排列效果；但在太短的收集距離下，則高分子的溶劑將無法有效揮發，會導致纖維呈現膠黏狀的情形；然而，只要能在適當的實驗參數之下，使用方型滾輪便可成功得到直徑在400~800奈米之間的有序排列電紡纖維薄膜。

Nanofibers are the most fascinating materials, playing an important role in nanotechnology. Electrospinning is a useful technique to generate continuous polymer fibers, which range from micrometers to a few nanometers of its diameters. The main advantages of electrospinning are simply apparatus, easily operating and relatively low cost. In addition, it can produce uniform and continuous nanofibers. This study aims to use a cubic drum collector to replace tranditional methods. Adopting drum collectors help continuously collect aligned nanofibers, and then aligned nanofibers are rearranged in the form of Layer-by-Layer stacked films. From the way indicated above, the expectation is that different stacked layer fibers piles with an angle of 90 degree between each layer. As a result, a nanofibers film of cross shape will be obtained. The results show that the collection distance is of crucial importance to the performance of the aligned fibers since it affects the instability of liquid jet. At the same electrical potential imposed a shorter collection distance is associated with a stronger electric field, which thus suppresses the whipping motion. However , if the collection distance is too short, the solvent of polymer is difficultly evaporated, causing a sticky morphology of fibers. Therefore, experimental parameters must be appropriately chosen in order to obtain perfect aligned nanofibers. The present results show that the diameters of good aligned nanofibers range between 400 to 800 nanometers. An additional controlling methed is thus needed for further improving the performance.