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Lab Chip

Title:		Monitoring the two-dimensional concentration profile of toluene vapors by using polymer-stabilized nematic liquid crystals in microchannels
Author(s):		Liu Z; Luo D; Yang KL;
Address:		"Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore 117576, Singapore. cheyk@nus.edu.sg"
Journal Title:		Lab Chip
Year:		2020
Volume:		20200415
Issue:		9
Page Number:		1687 - 1693
DOI:		10.1039/c9lc01021a
ISSN/ISBN:		1473-0189 (Electronic) 1473-0189 (Linking)
Abstract:		"Many volatile organic compounds (VOCs) are hazardous to human health and their concentrations need to be monitored over a large area. However, most chemical sensors can only be used for point detection. In this paper, we report a method to obtain a two-dimensional (2D) concentration profile of toluene vapor by using polymer-stabilized liquid crystals (PSLCs). After the PSLC sample is exposed to toluene vapor ranging from 9300 to 2800 ppm, the PSLC changes its interference color according to different local toluene concentrations. By using the interference color, we can obtain a 2D concentration profile of toluene inside the PSLC and study the diffusion of toluene inside the PSLC in great detail. We also determine the diffusion coefficient of dissolved toluene inside the PSLC to be 1.01 x 10(-6) cm(2) s(-1)"
Keywords:
Notes:		"PubMed-not-MEDLINELiu, Zongdai Luo, Dan Yang, Kun-Lin eng Research Support, Non-U.S. Gov't England 2020/04/16 Lab Chip. 2020 May 7; 20(9):1687-1693. doi: 10.1039/c9lc01021a. Epub 2020 Apr 15"