For workers who deal with hazardoushealth gases, have long been established electronic devices for the detection of toxic substances. However, they have several drawbacks: firstly, they are quite expensive, and secondly, they must be trained before using them. Researchers from Tufts University have proposed a cheap and simple alternative - special clothes that react to the presence of dangerous gases by changing their color.
So unusual and useful property createdclothes associated with the use of threads impregnated with special dyes. In particular, we are talking about meso-tetraphenylporphyrin (MnTPP) and bromthymol blue, which react to ammonia, and methyl red - it actively interacts with hydrogen chloride. As a rule, these toxic gases are emitted with cleaning agents and fertilizers.
The process of dyeing is divided into severalstages. First of all, they are dipped into the dyes themselves, and then treated with acetic acid so that the surface becomes coarse and the threads absorb paint better. At the last stage, the dyed thread is treated with polydimethylsiloxane (PDMS), which gives it water-repellent properties, protects the paint from leaching, while not blocking gas permeability.
During the test, the researchers found thatclothes made of new threads change their color in proportion to the concentration of poisonous gas. It is noteworthy that it is effective even under water - the fibers were able to detect dissolved ammonia. The color change is visible to the naked eye, but for accuracy you can use a spectrometer, or a special application for a smartphone.
In theory, such clothing will be used in many areas. For example, workers in the field of oil and gas production, healthcare, and rescue workers will be able to clothe it.
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