Modesto-López Luis B, Olmedo-Pradas Jesús
Department of Aerospace Engineering and Fluid Mechanics, ETSI, Universidad de Sevilla, Camino de los Descubrimientos S/N, 41092 Sevilla, Spain.
ACS Omega. 2022 Apr 7;7(15):12549-12555. doi: 10.1021/acsomega.1c05589. eCollection 2022 Apr 19.
Controlled ejection of liquids at capillary scales is a ubiquitous phenomenon associated with significant advances in, for instance, molecular biology or material synthesis. In this work, we introduce a high-throughput approach, which relies on a micromixing mechanism to eject and fragment viscous liquids, for production of microfibers from poly(vinyl alcohol) solutions. First, filaments were generated pneumatically with a so-called flow-blurring atomizer and using liquid flow rates of up to ∼1 L/min. Subsequently, the filaments were ionized online by corona discharge and consecutively manipulated with an electric field created by disc electrodes. Such charging of the filaments and the effect of the electric field allowed for their ultrafast elongation and diameter reduction from 150 μm down to fibers of 500 nm, which after collection exhibited fabric-like texture. The approach presented herein is a general procedure with potential for scalability that, upon proper adaptation, may be extended to various polymeric materials.
在毛细管尺度下对液体进行可控喷射是一种普遍存在的现象，与分子生物学或材料合成等领域的重大进展相关。在这项工作中，我们引入了一种高通量方法，该方法依靠微混合机制来喷射和破碎粘性液体，用于从聚乙烯醇溶液中生产微纤维。首先，使用所谓的流动模糊雾化器以高达约1 L/min的液体流速气动产生细丝。随后，细丝通过电晕放电进行在线电离，并通过圆盘电极产生的电场连续操纵。细丝的这种充电以及电场的作用使其能够超快伸长，直径从150μm减小到500nm的纤维，收集后的纤维呈现出织物状纹理。本文提出的方法是一种具有可扩展性潜力的通用程序，经过适当调整后可扩展到各种聚合物材料。
