Liquid-crystal-droplet-based Monitoring System for Water-soluble Inorganic Acidic Gases from the Atmosphere
- Authors
- An, Z.; Jang, C.-H.
- Issue Date
- Sep-2020
- Publisher
- SpringerOpen
- Keywords
- 4-cyano-4′-pentylbiphenyl (5CB); Acidic gas; Gas sensor; Liquid crystal droplet pattern
- Citation
- Biochip Journal, v.14, no.3, pp.258 - 267
- Journal Title
- Biochip Journal
- Volume
- 14
- Number
- 3
- Start Page
- 258
- End Page
- 267
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/78405
- DOI
- 10.1007/s13206-020-4304-2
- ISSN
- 1976-0280
- Abstract
- A liquid crystal (LC)-based pH sensor for real-time monitoring of variations in localized pH values near the LC droplets was developed, and its applicability for the detection of acidic gases was explored. It was found that 4-cyano-4′-pentylbiphenyl (5CB), when doped with hexanoic acid (HA), shows a bright-fan-shaped (planar orientation of LCs) to dark-cross (homeotropic orientation of LCs) optical response to a minimal change of the pH value (from 6.5 to 6.6). The fast and intensive pH-driven optical response can be explained mainly with the orientational transitions of 5CB, induced by the protonation and deprotonation of HA at the interface of aqueous/LC droplet. Because of its high pH sensitivity, the LC-based sensor was further exploited for monitoring the local pH changes, which were originated from concentration changes of acidic gases. The results suggested that at an industrial scale/production environment, the sensor shows excellent performance for long-term monitoring and sensing of acidic gases. This type of LC-based sensor may find to fulfill its applicability potential in the trace measurement of acidic gases. © 2020, The Korean BioChip Society and Springer.
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