Controlled size production of large double droplets in one-step microfluidic devices

XU Lan; PAN Dawei; DENG Chaojun; HUANG Weixing; LIU Meifang

doi:10.11949/0438-1157.20190413

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Controlled size production of large double droplets in one-step microfluidic devices

Fluid dynamics and transport phenomena | 更新时间：2026-07-24

- Controlled size production of large double droplets in one-step microfluidic devices
- CIESC Journal Vol. 70, Issue 12, Pages: 4617-4624(2019)
- 作者机构：
  
  1. 四川大学化学工程学院，四川成都 610065
  2. 中国工程物理研究院激光聚变研究中心，四川绵阳 621900
  3. 中国核动力研究设计院核反应堆系统设计技术重点实验室，四川成都 610041
- 作者简介：
- 基金信息：
- DOI：10.11949/0438-1157.20190413
  CLC： TQ 021.1
- Received：18 April 2019，
  
  Revised：2019-09-03，
  
  Online First：09 June 2020，
  
  Published：05 December 2019
- 稿件说明：
移动端阅览
徐兰, 潘大伟, 邓朝俊, 黄卫星, 刘梅芳. “一步法”微流控制备大直径复合乳粒中几何尺寸调控规律研究[J]. 化工学报, 2019, 70(12): 4617-4624

XU Lan, PAN Dawei, DENG Chaojun, HUANG Weixing, LIU Meifang. Controlled size production of large double droplets in one-step microfluidic devices[J]. CIESC Journal, 2019, 70(12): 4617-4624
徐兰, 潘大伟, 邓朝俊, 黄卫星, 刘梅芳. “一步法”微流控制备大直径复合乳粒中几何尺寸调控规律研究[J]. 化工学报, 2019, 70(12): 4617-4624 DOI： 10.11949/0438-1157.20190413.

XU Lan, PAN Dawei, DENG Chaojun, HUANG Weixing, LIU Meifang. Controlled size production of large double droplets in one-step microfluidic devices[J]. CIESC Journal, 2019, 70(12): 4617-4624 DOI： 10.11949/0438-1157.20190413.

摘要

复合乳粒几何尺寸的精密调控对于实现特定规格参数要求的聚合物空心微球的可控制备具有重要意义。基于“一步法”微流控装置，通过大量的实验获得了以油相与内水相流量比

和连续相毛细管数

为变量的复合乳粒构建操作区域图，并在能稳定形成复合乳粒区域范围内探讨了

、

以及管道尺寸对大直径复合乳粒几何尺寸的影响规律。实验结果表明：随着连续相毛细管数增大，复合乳粒几何尺寸(内径、外径和壁厚)均减小；随着油相与内水相流量比增大，复合乳粒内径减小，壁厚增大，而外径则呈现先减小后增大的趋势。此外，复合乳粒几何尺寸随管道直径增大而增大，且存在极限尺寸。实验结果可为单分散大直径复合乳粒的定量可控制备提供实验设计依据。

Abstract

The precise regulation of the composite latex geometry is important for the controllable preparation of polymer hollow microspheres to achieve specific specifications. Based on one-step microfluidic device

extensive experiments for double droplet preparation are conducted and the flow pattern diagram dependent on capillary number of continuous phase

and the flow rate ratio of oil phase to inner phase

O/W1

is obtained

and further the effects of the

O/W1

and the diameter of external phase tube on the large double droplets size are discussed in this work. As

increases

the droplet sizes

regarding inner diameter

shell thickness and outer diameter

decrease because of a large drag force generated by a continuous phase. With the

O/W1

increasing

the inner diameter decreases

while the shell thickness increases. However

as for the outer diameter of such double droplet

it initially decreases and then increases. In addition

the droplet sizes increase as the tube diameter increases under the same flow rate of all three phases

but it is always limited by the tube diameter. The present work could provide some guidelines for controllable and precise fabrication of double droplets with large diameter.

关键词

Keywords

references

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