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Issue 23, 2011
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Monitoring spatial distribution of ethanol in microfluidic channels by using a thin layer of cholesteric liquid crystal

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Abstract

Monitoring spatial distribution of chemicals in microfluidic devices by using traditional sensors is a challenging task. In this paper, we report utilization of a thin layer of cholesteric liquid crystal for monitoring ethanol inside microfluidic channels. This thin layer can be either a polymer dispersed cholesteric liquid crystal (PDCLC) layer or a free cholesteric liquid crystal (CLC) layer separated from the microfluidic device by using a thin film of PDMS. They both show visible colorimetric responses to 4% of ethanol solution inside the microfluidic channels. Moreover, the spatial distribution of ethanol inside the microfluidic channel can be reflected as a color map on the CLC sensing layers. By using this device, we successfully detected ethanol produced from fermentation taking place inside the microfluidic channel. These microfluidic channels with embedded PDCLC or embedded CLC offer a new sensing solution for monitoring volatile organic compounds in microfluidic devices.

Graphical abstract: Monitoring spatial distribution of ethanol in microfluidic channels by using a thin layer of cholesteric liquid crystal

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Supplementary files

Article information


Submitted
27 May 2011
Accepted
28 Sep 2011
First published
27 Oct 2011

Lab Chip, 2011,11, 4093-4098
Article type
Paper

Monitoring spatial distribution of ethanol in microfluidic channels by using a thin layer of cholesteric liquid crystal

L. Sutarlie and K. Yang, Lab Chip, 2011, 11, 4093
DOI: 10.1039/C1LC20460B

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