Effect of Sub-Pattern on Guiding Liquid Propagation at Microchannel Junction

Yagi, Natsumi; Kawai, Maki

doi:10.2494/photopolymer.29.833

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2017

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“…Meanwhile, in functional microchannel fabrication, it is required to design some corrugated surfaces or some pillars at an intersection among microchannels [12][13][14][15]. The authors have already discussed the guiding liquid propagation at the junction of the microchannel two-dimensionally [16]. The role of pinning effect around the subpattern was clarified.…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Analysis of Liquid Propagation at Microchannel Junction using ESEM

Yagi

Kawai

2017

J. Photopol. Sci. Technol.

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The three-dimensional wetting phenomena in a T-shaped microchannel made of a SU-8 photoresist accompanying with a pillar sub-pattern are analyzed by using an environmental scanning electron microscopy (ESEM). By lowering the sample temperature in the ESEM chamber at constant the H 2 O pressure, the water condensation occurs under H 2 O dew point and the liquid propagation in the microchannel can be observed. The experimental results show that the pinning angle of water flow at T-junction is 58 degrees in the T-shaped microchannel. In the case of the T-shaped microchannel with the sub-pattern, it is found that the pinning angle becomes low by adhering the water around the sub-pattern. These results can realize to the smooth flow at the channel junction without any water trapping for the three-dimensional microfluidic devices.

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