Aspect ratio for microchannels with nonuniform surface properties and spontaneous capillary

DENG Yong-bo; ZHANG Ping; DU Xin; WU Yi-hui; LIU Zhen-yu; LIU Yong-shun

doi:10.3788/OPE.20101807.1562

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Aspect ratio for microchannels with nonuniform surface properties and spontaneous capillary

Article | 更新时间：2020-08-12

- Aspect ratio for microchannels with nonuniform surface properties and spontaneous capillary
- Optics and Precision Engineering Vol. 18, Issue 7, Pages: 1562-1567(2010)
- 作者机构：
  
  1. 中国科学院研究生院,北京 100039
  2. 中国科学院长春光学精密机械与物理研究所应用光学国家重点实验室,吉林长春,130033
  3. 中国科学院苏州生物医学工程技术研究所,江苏苏州 215163
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20101807.1562
  CLC：
- Received：22 August 2009，
  
  Revised：30 September 2009，
  
  Published Online：30 July 2010，
  
  Published：20 July 2010
- 稿件说明：
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邓永波, 张平, 杜新, 吴一辉, 刘震宇, 刘永顺. 亲/疏水性不同壁面组成微通道的深宽比与通道内液体的自发毛细流动[J]. 光学精密工程, 2010,18(7): 1562-1567

DENG Yong-bo, ZHANG Ping, DU Xin, WU Yi-hui, LIU Zhen-yu, LIU Yong-shun. Aspect ratio for microchannels with nonuniform surface properties and spontaneous capillary[J]. 光学精密工程, 2010,18(7): 1562-1567
邓永波, 张平, 杜新, 吴一辉, 刘震宇, 刘永顺. 亲/疏水性不同壁面组成微通道的深宽比与通道内液体的自发毛细流动[J]. 光学精密工程, 2010,18(7): 1562-1567 DOI： 10.3788/OPE.20101807.1562.

DENG Yong-bo, ZHANG Ping, DU Xin, WU Yi-hui, LIU Zhen-yu, LIU Yong-shun. Aspect ratio for microchannels with nonuniform surface properties and spontaneous capillary[J]. 光学精密工程, 2010,18(7): 1562-1567 DOI： 10.3788/OPE.20101807.1562.

摘要

研究了聚合物芯片上由亲/疏水性不同壁面组成的微通道内流体的流动行为。为了实现该类微通道内液体的自发毛细流动和被操作液体的自发毛细输运

根据系统总表面自由能极小原理

提出了微通道内毛细输运自发实现时微通道的临界深宽比条件。在以二聚二甲基硅氧烷(PDMS)和玻璃为材料的微流控芯片上进行了三面疏水一面亲水微通道内水的毛细输运实验。针对165 m

200 m和265 m 3种深度的通道

理论计算的临界深宽比为0.5

而实验得到的值分别为0.4714

0.4878和0.4818

实验结果与理论预测结果基本相符

从而验证了由亲疏水性不同的壁面组成的微通道内毛细输运自发实现的临界深宽比条件。

Abstract

The flow characteristics of the fluid in microchannels formed by different hydrophobic and hydrophilic walls on the polymeric microfluidic chips were researched in this study.To achieve the spontaneous capillary of the liquid in a microchannel

the aspect ratio condition of the microchannels for the smoothing capillary was proposed on the basis of the free energy minimization approach. The experiments of the capillary transportation in the microchannels with three Polydimelhysiloxane(PDMS) walls and one glass wall were performed to confirm the aspect ratio condition. According to proposed theory

the critical aspect ratio of the microchannels with the depths 165 m

200 m and 265 m is 0.5000. In our experiment

the critical aspect ratios are 0.4714

0.4878 and 0.4818 respectively.Obtain data show that the experimental results are in good agreement with the theoritical one

which verifies the aspect ratio obtained by our experiments.

关键词

Keywords

references

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