wipe!wipe!wipe!Dirty windows may be the "poison source" at home

Text ｜ Li Muzi

Dirty windows may hide potential harmful pollutants under the culinary fatty acid protective film.

These pollutants stay on the window for a long time.

According to a new study conducted by researchers from the University of Birmingham in the United Kingdom, the fatty acids contained in cooking discharge are very stable and difficult to break down in the atmosphere.

Picture source: pixabay

This means that when they encounter solid surfaces, such as windows, they will gradually form a self -organized film over time, and it will be very slowly decomposed by the action of other chemicals in the atmosphere.

In this process, the film will become rough and absorb more water from the air.

In addition, toxic pollutants are wrapped under this strong shell to avoid decomposition in the atmosphere.

"Dr. Christian PFRANG, a senior author, said:" The fatty acids in these thin films are not particularly harmful, but because they cannot be decomposed, they can effectively protect any other pollutants that may be trapped below. "

This study is a cover article published on September 15th, and is conducted in cooperation with experts from the University of Bath, diamond light sources and ISIS neutrons and Miao Ziyuan, and the French Institute of Laue-LANGEVIN.

Researchers are committed to designing material samples in the laboratory to approach the sample of "real world".

They made an ultra -thin pollution film with a thickness of only dozens of nanometers.

Researchers also use neutron and X -ray to study the change of nano -level components and its surface structure of the film.

By changing the amount of humidity and ozone (a major indoor and outdoor pollutants), they can also simulate the change of film.

Researchers have found that the self -organizing arrangement of repeated molecular tablets in the film is the so -called layer -like phase, making it difficult for small molecules like ozone to come into contact with the active part of the fatty acids in these structures.

Once it is deposited and exposed to ozone, the surface of the film will become less smooth and easier to absorb moisture, which will affect the formation and life of gas solids in the atmosphere.

Related thesis information:

http://doi.org/10.1039/d2ea00011c

"China Science News" (2022-09-27 The original title "Dirty Window may hide toxic pollutants")

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Edit | Zhao Lu

Capture | Guo Gang

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