Microfluidic plug steering using surface acoustic waves

doi:10.1039/c5lc00468c

2015-01-01

PRE

Muhsincan Şeşen

Tuncay Alan

Adrian Neild *

DOI：10.1039/c5lc00468c

原文链接

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摘要

En 中文

Digital microfluidic systems, in which isolated droplets are dispersed in a carrier medium, offer a method to study biological assays and chemical reactions highly efficiently. However, it's challenging to manipulate these droplets in closed microchannel devices. Here, we present a method to selectively steer plugs (droplets with diameters larger than the channel's width) at a specially designed Y-junction within a microfluidic chip. The method makes use of surface acoustic waves (SAWs) impinging on a multiphase interface in which an acoustic contrast is present. As a result, the liquid-liquid interface is subjected to acoustic radiation forces. These forces are exploited to steer plugs into selected branches of the Y-junction. Furthermore, the input power can be finely tuned to split a plug into two uneven plugs. The steering of plugs as a whole, based on plug volume and velocity is thoroughly characterized. The results indicate that there is a threshold plug volume after which the steering requires elevated electrical energy input. This plug steering method can easily be integrated to existing lab-on-a-chip devices and it offers a robust and active plug manipulation technique in closed microchannels.

Keyword:

RADIATION PRESSURE

MAGNETIC SEPARATION

ON-CHIP

PARTICLE

CHANNEL

DROPLETS

CELLS

ENCAPSULATION

INTERFACES

DEVICES

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期刊

Lab on a Chip

IF:

5.4

论文数:

9.0K

被引数:

3.3W

机构

Monash University

学者数:

5.4W

论文数: 5.4W

被引数: 79

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