Microcapillary films (MCFs) are microextrusion-processed plastic films containing an array of parallel microcapillaries, and have been widely utilized as microfluidic platforms. However, the nonuniform size distribution within a single MCF strip limits the application of MCFs in monodisperse droplet generation. In this paper, the mechanisms that lead to uneven microcapillary dimensions in conventional MCFs whose gas pressures in all channels are the same is first clarified. The effect of gas pressure in a single channel on the microcapillary dimensions in the film is then studied. Finally, the size uniformity of the microcapillaries is improved by separate gas injection in different channels, providing new possibilities for the generation of highly monodisperse microdroplets.

中文翻译：

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通过单独注气改善微毛细管膜中微毛细管的尺寸均匀性

微毛细管薄膜 (MCF) 是经过微挤压加工的塑料薄膜，其中包含一系列平行的微毛细管，已被广泛用作微流体平台。然而，单个 MCF 条带内的不均匀尺寸分布限制了 MCF 在单分散液滴生成中的应用。在本文中，首先阐明了导致所有通道中气压相同的传统 MCF 中微毛细管尺寸不均匀的机制。然后研究了单个通道中的气压对薄膜中微毛细管尺寸的影响。最后，通过在不同通道中单独注入气体，提高了微毛细管的尺寸均匀性，为高度单分散的微滴的产生提供了新的可能性。