For workers dealing with hazardous gases, have long been the electronic device for the detection of toxic substances. However, they have several drawbacks: first, they are quite expensive, and secondly, before using them need to be trained. Researchers from tufts University have proposed a cheap and simple alternative to special clothes, which reacts to the presence of dangerous gases change their color.
Such an unusual and useful property created clothing associated with filaments, impregnated with special dyes. In particular, we are talking about meso-tetraphenylporphyrin (MnTPP) and bromtimol blue, which reacts to the ammonia, and methyl red, but he actively interacts with hydrogen chloride. Typically, these toxic gases are extracted cleaning products and fertilizers.
The process of painting the threads is divided into several stages. First they are dipped in dyes, and then treated with acetic acid so that the surface became rough, and the thread better have absorbed the paint. At the last stage of the dyed filament is treated with a polydimethylsiloxane (PDMS), which gives it water repellent properties that protects the paint from washing out, while not blocking the gas permeability.
During testing, the researchers found that woven from the new yarns clothing changes color proportional to the concentration of the poisonous gas. It is noteworthy that it is effective even under water fibre was able to detect dissolved ammonia. Color change visible to the naked eye, but for accuracy, we can use a spectrometer, or a special application for a smartphone.
In theory, these clothes will be used in many fields. For example, it can be dressed workers in the fields of oil and gas, healthcare and rescue workers.
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