Fabrication of round channels using the surface tension of PDMS and its application to a 3D serpentine mixer
Fabrication of round channels using the surface tension of PDMS and its application to a 3D serpentine mixer
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DOI：
10.1088/0960-1317/17/8/016
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发表时间：
2007-08-01
影响因子：
2.3
通讯作者：
Kang, Ji Yoon
中科院分区：
文献类型：
--
作者：
Lee, Kangsun;Kim, Choong;Kang, Ji Yoon
提出了一种利用PDMS表面张力制备圆形微通道的新工艺，并将其应用于具有屏障结构的微混合器中。当固化的PDMS层（通道层）接触液体PDMS膜（弯月面层）时，由于表面张力，在微通道中的侧壁周围形成弯月面。调节通道层的外部负载压力和接触面积以形成各种横截面形状，例如U形、椭圆形、半圆形和圆形。由于通道的宽度也决定了由毛细管高度差形成的深度，因此可以使用一步工艺制造多深度通道。它被应用到一个双深度蛇形混合器，消除了传统的软光刻对准键合。在Re > 10的范围内，三维结构的混合器比二维结构的混合器的混合性能有所提高。当雷诺数为80时，酚酞和氢氧化钠可以充分混合。所提出的制造方法在需要圆角和多深度通道的各种微流体装置中可能是非常有用的。
A novel fabrication technique was developed to fabricate round microchannels and applied to a micro mixer having a barrier structure using surface tension of PDMS. When the solidified PDMS layer (channel layer) contacts the liquid PDMS film (meniscus layer), a meniscus is formed around the sidewall in the microchannel due to surface tension. The external load pressure and contact area of the channel layer were adjusted to form various cross-sectional shapes such as a U shape, ellipse, semi-circle and circle. Since the width of the channel also determines the depth formed by the difference in capillary height, a multi-depth channel can be fabricated using a one-step process. It was applied to a dual-depth serpentine mixer, eliminating the aligned bonding of conventional soft lithography. The 3D-structure mixer enhanced mixing performance in the range of Re > 10 compared with a 2D-structure. It could fully mix phenolphthalein and sodium hydroxide when the Reynolds number was 80. The suggested fabrication method could be very useful in various microfluidic devices that need round corners and multi-depth channels.