The creation of drops in T-shaped microfluidic devices with the 'modified' laser-LIGA technique: I. Fabrication
The creation of drops in T-shaped microfluidic devices with the 'modified' laser-LIGA technique: I. Fabrication
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DOI：
10.1088/0964-1726/15/1/019
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发表时间：
2006-02-01
影响因子：
4.1
通讯作者：
Cooper-White, J
中科院分区：
文献类型：
--
作者：
Husny, J;Jin, HY;Cooper-White, J
表面效应在多相微流体中是至关重要的，特别是在液滴的形成中，固体表面特性是成功形成微液滴和纳米液滴的决定性因素。通常，由于所选择的微加工方法改变了固体表面特性，因此无法产生液滴。提出了一种新型的微加工技术，该技术将镍模板制造与聚合物基板上的微结构复制相结合，用于微流控器件的批量生产。“改进的”激光liga技术消除了传统准分子激光烧蚀方法导致的表面润湿问题和更深关节部分的出现。在这项工作中，单分散微滴可以成功地在用这种技术制造的t形微通道中产生。对t型流体装置剪切诱导液滴形成的研究表明，液滴尺寸随着剪切的增加而减小，并且在给定的分散相流量下，液滴产能存在最大值。实验数据可以产生高水平的确定性和可重复性，这再次证明了该技术的鲁棒性。
Surface effects are crucial in multiphase microfluidics, particularly in drop creation, where solid surface properties are a determining factor ill a successful creation of micro- and nanodrops. Often, drops cannot be created due to the modification of solid Surface properties as a result of the chosen micro fabrication method. A novel micrornachining technique is demonstrated, which combines nickel template fabrication and replication of microstructures on polymer substrates for mass production of microfluidic devices. The 'modified' laser-LIGA technique eliminates Surface wetting problems and the Occurrence of a deeperjoint section resulting from traditional excimer laser ablation based methods. It is shown in this work that monodisperse microdrops can be successfully created in T-shaped microchannels fabricated with this technique. An investigation of shear-induced drop formation from the resulting, T-shaped fluidic devices has shown that drop size decreases with increasing shear and that there exists a maximum in drop productivity for a given dispersed phase flowrate. The experimental data can be produced with high levels of certainty and repeatability, which again demonstrates the robustness of this technique.