微通道内台阶阀截止过程中的毛细流动动态效应

张平; 徐磊; 邓永波

doi:10.3788/OPE.20111912.2919

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微通道内台阶阀截止过程中的毛细流动动态效应

微纳技术与精密机械 | 更新时间：2020-08-12

- 微通道内台阶阀截止过程中的毛细流动动态效应
- Dynamic effect in process of stopping capillary by step valve in microchannel
- 光学精密工程 2011年19卷第12期页码：2919-2926
- 作者机构：
  
  1. 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
  2. 中国科学院研究生院北京,100039
  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：
  
  国家863高技术研究发展计划B类资助项目(No.2006AA04Z367)();国家863高技术研究发展计划重点资助项目(No.2007AA042102,No.2006
- DOI：10.3788/OPE.20111912.2919
  中图分类号： TH134.1;TH703
- 收稿日期：2011-04-14，
  
  修回日期：2011-05-18，
  
  网络出版日期：2011-12-25，
  
  纸质出版日期：2011-12-25
- 稿件说明：
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张平, 徐磊, 邓永波. 微通道内台阶阀截止过程中的毛细流动动态效应[J]. 光学精密工程, 2011,19(12): 2919-2926

ZHANG Ping, XU Lei, DENG Yong-bo. Dynamic effect in process of stopping capillary by step valve in microchannel[J]. Editorial Office of Optics and Precision Engineering, 2011,19(12): 2919-2926
张平, 徐磊, 邓永波. 微通道内台阶阀截止过程中的毛细流动动态效应[J]. 光学精密工程, 2011,19(12): 2919-2926 DOI： 10.3788/OPE.20111912.2919.

ZHANG Ping, XU Lei, DENG Yong-bo. Dynamic effect in process of stopping capillary by step valve in microchannel[J]. Editorial Office of Optics and Precision Engineering, 2011,19(12): 2919-2926 DOI： 10.3788/OPE.20111912.2919.

摘要

分析了由亲/疏水性不同壁面组成的微通道内毛细流动的动态效应对台阶阀截止功能的影响和在台阶阀截止过程中毛细流动动态效应与台阶阀前微通道长度的关系。根据毛细被动阀的工作原理和能量守恒原理

得出台阶阀有效截止时

台阶阀前微通道临界长度的计算公式。通过数值仿真得到临界长度所对应的计算长度

当台阶阀前微通道实际长度大于等于计算长度时

台阶阀即可有效截止。用聚二甲基硅氧烷(PDMS) 和玻璃为材料键合制作微流控芯片

在三面疏水、一面亲水的矩形微通道内进行了台阶阀截止实验。对于深度为40 m

宽度为200~400 m的系列微通道

台阶阀前微通道的计算长度为4.531 6~10.081 m

在台阶阀前微通道实际长度为10~2 000 m的微流控芯片内进行的台阶阀截止实验表明

即使台阶阀前微通道实际长度为10 m

台阶阀也能有效截止毛细流动。因此

在微通道内台阶阀截止过程中毛细流动的动态效应可以忽略。

Abstract

The relationship between the dynamic effect of a capillary and the length of microchannel in front of a step valve was researched

then the influence of dynamic effect in the process of stopping the capillary in microchannel formed by hydrophobic and hydrophilic walls on the step valve was analyzed. According to the working principle of the passive valve of capillary and energy conservation law

the critical length in front of the step valve was calculated when the step valve stoped the capillary. The calculated length corresponding to the critical length was obtained by numerical simulation. It shows that when the actual length in front of the step valve is greater than or equal to the calculated length

the valve can stop the capillary effectively. The step valves were fabricated by bonding polydimethylsiloxane (PDMS) to glass. Experiments of stopping the capillary by the step valve were performed in a rectangular microchannel formed by three hydrophobic PDMS walls and one hydrophilic glass wall. For the series of microchannel with a depth of 40 m and widths from 200 m to 400 m

the calculated length in front of the step valve is from 4.531 6 m to 10.081 m. In the experiments

the actual length before the step valves for effectively stopping the capillary is in the interval from 10 m to 2 000 m. The results show that even if the actual length in front of the step valve is 10 m

the step valve can also stop the capillary. Therefore

the dynamic effect of the capillary can be ignored in stopping the step valves in the microchannel.

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references

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微通道内台阶阀截止过程中毛细流动动态效应分析方法研究

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