Liquid crystal-based sensor system for detecting formaldehyde in aqueous solutions
學年 109
學期 1
出版（發表）日期 2020-11-01
作品名稱 Liquid crystal-based sensor system for detecting formaldehyde in aqueous solutions
作品名稱（其他語言）
著者 Ho, T. T.; Huang, J.-W.; Peng, B.-C.; Tsao W.-C; Chen, C.-H.
單位
出版者
著錄名稱、卷期、頁數 Microchem J. 158, 105235
摘要 We developed a liquid crystal (LC)-based sensor system for detecting formaldehyde in aqueous solutions. In this system, nematic LCs were doped with 4′-pentyl-4-biphenylamine (PBA), which acts as the amphiphilic molecule to align at LC/aqueous interface. Such alignment induced the homeotropic orientation of LCs and a dark signal was observed under polarized light. Formaldehyde in the aqueous solutions would react with the amine group of PBA to form corresponding imine, which reduced the amount the PBA at LC/aqueous interface. As a result, the orientation of LCs was disrupted and a dark-to-bright transition of the LC images was observed. By using this mechanism, 0.5 mM of formaldehyde can be detected in 10 min with good selectivity. Moreover, we demonstrated that this system can be applied to detect formaldehyde in commercial facial toners with the limit of detection (LOD) of 30 mM, which is below the safety level of cosmetic products regulated by USA and the European Union. Because the LC-based sensor system is cost-effective and easy to use, while its signals can be simply differentiated through the naked-eye under ambient light, it shows great potential for the applications of formaldehyde detection in the daily necessities for general family.
關鍵字 Liquid crystal;Liquid crystal-based sensor;Portable sensor;Formaldehyde detection;imine formation
語言 en_US
ISSN 0026-265X
期刊性質 國外
收錄於 SCI
產學合作
通訊作者 Chih-Hsin Chen
審稿制度 是
國別 BES
公開徵稿
出版型式 ,電子版,紙本
相關連結

機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/120157 )

SDGS 消除飢餓,良好健康和福祉,潔淨水與衛生