Monitoring the two-dimensional concentration profile of toluene vapors by using polymer-stabilized nematic liquid crystals in microchannels

Liu, Zongdai1,2; Luo, Dan2; Yang, Kun-Lin1

2020-05-07

10.1039/c9lc01021a

LAB ON A CHIP   影响因子和分区

1473-0197

1473-0189

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).

SCI ; EI

英语

通讯

Agency for Science, Technology and Research (A*STAR) in Singapore[1421200079] ; Natural National Science Foundation of China (NSFC)[61875081] ; Shenzhen Science and Technology Innovation Commission[JCYJ20180305180700747]

Biochemistry & Molecular Biology ; Chemistry ; Science & Technology - Other Topics ; Instruments & Instrumentation

Biochemical Research Methods ; Chemistry, Multidisciplinary ; Chemistry, Analytical ; Nanoscience & Nanotechnology ; Instruments & Instrumentation

WOS:000534043300011

ROYAL SOC CHEMISTRY

20202008650927

Volatile organic compounds ; Chemical detection ; Nematic liquid crystals

Chemistry:801 ; Organic Compounds:804.1

CHEMISTRY

Web of Science

1.Natl Univ Singapore, Dept Chem & Bimol Engn, 4 Engn Dr 4, Singapore 117576, Singapore
2.Southern Univ Sci & Technol, Dept Elect & Elect Engn, Xueyuan Rd 1088, Shenzhen 518055, Guangdong, Peoples R China

Liu, Zongdai,Luo, Dan,Yang, Kun-Lin. Monitoring the two-dimensional concentration profile of toluene vapors by using polymer-stabilized nematic liquid crystals in microchannels[J]. LAB ON A CHIP,2020,20(9):1687-1693.

Liu, Zongdai,Luo, Dan,&Yang, Kun-Lin.(2020).Monitoring the two-dimensional concentration profile of toluene vapors by using polymer-stabilized nematic liquid crystals in microchannels.LAB ON A CHIP,20(9),1687-1693.

Liu, Zongdai,et al."Monitoring the two-dimensional concentration profile of toluene vapors by using polymer-stabilized nematic liquid crystals in microchannels".LAB ON A CHIP 20.9(2020):1687-1693.