Journal Textile Coloration and Finishing Year / Vol., Issue, Month 2021 / V.33,no.2,Jun Title Properties and Application of Azo based Dyes for Detecting Hazardous Acids Authors Seung-Rim Shin*, Kun Jun, Kyoung-Lyong An, Sang Woong Kim1, Tae-Hwan Kim1, Dong Sung Seo1, and Chang Ick Lee1 Institution/Affiliations Korea Research Institute of Chemical Technology, 1Hanso Inc. Pages/Total page pp.49 ~ 63 / 15 Language Korean Abstract In this study, a convenient approach for sensitive, quick and simple detection of hazardous acids was investigated. A series of azo dyes were synthesized and applied as a chemosensor for the acid detection both on fibers and in solution. Various aniline, benzothiazole or isoxazole derivatives were used as diazo component and coupled with N-benzyl-N-ethylaniline or 2,2`-(phenylimino)bis-ethanol to give azo based dyes. The acid sensing phenomenon was observed by naked-eye and detection was further confirmed by UV-Vis spectrophotometer and hue difference(ΔH*) evaluation. The developed sensors showed a distinct and quick color change from yellow to magenta by addition of trace amounts of the hazardous acids. The absorption maxima was shifted to a longer wavelength by 70 ~ 150nm and hue difference(ΔH*) was 60 ~ 120o. A cotton fiber coated with Dye 1 exhibited excellent storage stability under various temperature(-30 ~ 43oC) and humidity(30 ~ 80%) conditions without discoloration and fading of the fiber sensors. Also the acid sensing properties were maintained. Keywords chemosensor, azo dyes, hazardous acids, coating, fiber Download   Reference http://koreascience.or.kr/journal/OSGGBT.page?&lang=ko