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브로모크레졸 그린(Bromocresol Green)의 할로크로믹 특성을 이용한 양모섬유 기반 산검출 텍스타일 센서 연구
고승효,이예진,이정진 한국섬유공학회 2022 한국섬유공학회지 Vol.59 No.2
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 seriousproblem to the human body. In the previous studies, we investigated the applicationof halochromic dyes on a nylon fabric for an acid-detecting textile chemosensor. In thisstudy, bromocresol green was selected as a pH-indicating dye and its dyeing, fastness, andacid-sensing properties on a wool woven fabric were investigated. Bromocresol green in anaqueous 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 ofpH 6 and over. Color yields (K/S) of bromocresol green on wool were dependent on thedyebath pH. The wool fabric showed greenish blue color when dyed at pH 4-7. The color ofwool dyed at pH 3 was yellowish green, and the color at pH 2 was olive. The percentexhaustion of bromocresol green on wool increased with decreasing the dyebath pH, anda 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 wasmaintained. When immersed in a solution of pH 2-3, the color changed into olive withexhibiting a big color difference. The soaping process did not affect the color fastness. Thewash and dry cleaning fastness of the wool fabric dyed at pH 3-5 was very good. The dryand wet rubbing fastness were excellent.
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Wool 기반의 산검출 텍스타일 센서를 위한 Bromocresol Purple의 Halochromic 특성 연구
이예진,고승효,이정진 한국섬유공학회 2022 한국섬유공학회지 Vol.59 No.2
Acid or base compounds in industries as well as acid rain are colorless so that they have difficulty in detecting. In the previous studies, we investigated a nylon chemosensor for detecting acidic liquids. In this study, we attempted to investigate a wool-based textile sensor using bromocresol purple as a pH-indicating dye. Dyeing properties of bromocresol purple on a wool woven fabric were investigated. The pH sensing property was also investigated by dipping the dyed wool fabric in aqueous solution with different pH values. Bromocresol purple in an aqueous solution showed maximum absorption at 432 nm with yellow color at a pH of 2-4, whereas the maximum absorption changed to 589 nm showing violet color at pH 7. Color yields (K/S) of bromocresol purple on wool were highly dependent on the dyebath pH. The wool fabric showed a strong orange color when dyed at pH 2. The color of wool dyed at pH 3-6 was yellowish brown or reddish brown, and the color at pH 7 was grayish blue. The percent exhaustion of bromocresol purple on wool increased as the pH of dyebath decreased, and a high exhaustion value of 98 to 99% could be obtained at pH 2-4. When the yellowish brown sample, dyed at pH 4, was immersed in a solution with a pH range of 4-5, its original color was maintained. Then, the color turned to yelloworange when immersed in a solution of pH 2-3. When immersed in a solution of pH 6, the color of the sample changed into brown. The color was also markedly changed into grayish purple when the sample was dipped in a solution of pH 7-8. The wash fastness of the wool fabric dyed at pH 3-5 was good to very good. The rubbing fastness were excellent, and dry cleaning fastness was very good.
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