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Info. Vol.14 - No.3 (2020.09.20)
Title Liquid-crystal-droplet-based Monitoring System for Water-soluble Inorganic Acidic Gases from the Atmosphere
Authors Zongfu An & Chang-Hyun Jang *
Institutions "Department of Chemistry, Gachon University, Seongnam-daero 1342, Sujeong-gu, Seongnam-si, Gyeonggi-do 13120, Republic of Korea
*Correspondence and requests for materials should be addressed to C.H. Jang (chjang4u@gachon.ac.kr)
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.
Keyword Liquid crystal droplet pattern, 4-cyano- 4′-pentylbiphenyl (5CB), Gas sensor, Acidic gas
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