브로모크레졸 그린(Bromocresol Green)의 할로크로믹 특성을 이용한 양모 섬유 기반 산검출 텍스타일 센서 연구

Wool Dyeing with Bromocresol Green for Halochromic Textile Sensors

Recently, the safety of workers in industries has emerged as an important issue. In particular, when the workers are exposed to gaseous or liquid acids, it can lead to a serious problem to the human body. In the previous studies, we investigated the application of halochromic dyes on a nylon fabric for an acid-detecting textile chemosensor. In this study, bromocresol green was selected as a pH-indicating dye and its dyeing, fastness, and acid-sensing properties on a wool woven fabric were investigated. Bromocresol green in an aqueous solution of pH 2-4 showed maximum absorption at 444 nm with yellow color, whereas the maximum absorption changed to 616 nm showing blue color in a solution of pH 6 and over. Color yields (K/S) of bromocresol green on wool were dependent on the dyebath pH. The wool fabric showed greenish blue color when dyed at pH 4-7. The color of wool dyed at pH 3 was yellowish green, and the color at pH 2 was olive. The percent exhaustion of bromocresol green on wool increased with decreasing the dyebath pH, and a high exhaustion value of 98-99% could be obtained at pH 2-4. When the control sample, dyed at pH 4, was immersed in a solution of pH 3.5-4, its original greenish blue color was maintained. When immersed in a solution of pH 2-3, the color changed into olive with exhibiting a big color difference. The soaping process did not affect the color fastness. The wash and dry cleaning fastness of the wool fabric dyed at pH 3-5 was very good. The dry and wet rubbing fastness were excellent.