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Issue 1, 2017
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Passive and active droplet generation with microfluidics: a review

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Abstract

Precise and effective control of droplet generation is critical for applications of droplet microfluidics ranging from materials synthesis to lab-on-a-chip systems. Methods for droplet generation can be either passive or active, where the former generates droplets without external actuation, and the latter makes use of additional energy input in promoting interfacial instabilities for droplet generation. A unified physical understanding of both passive and active droplet generation is beneficial for effectively developing new techniques meeting various demands arising from applications. Our review of passive approaches focuses on the characteristics and mechanisms of breakup modes of droplet generation occurring in microfluidic cross-flow, co-flow, flow-focusing, and step emulsification configurations. The review of active approaches covers the state-of-the-art techniques employing either external forces from electrical, magnetic and centrifugal fields or methods of modifying intrinsic properties of flows or fluids such as velocity, viscosity, interfacial tension, channel wettability, and fluid density, with a focus on their implementations and actuation mechanisms. Also included in this review is the contrast among different approaches of either passive or active nature.

Graphical abstract: Passive and active droplet generation with microfluidics: a review

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Article information


Submitted
10 Aug 2016
Accepted
30 Oct 2016
First published
01 Nov 2016

Lab Chip, 2017,17, 34-75
Article type
Critical Review

Passive and active droplet generation with microfluidics: a review

P. Zhu and L. Wang, Lab Chip, 2017, 17, 34
DOI: 10.1039/C6LC01018K

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