A special treatment for the coating of the nets will remove from the incoming air almost all particles that may be harmful to health
New window screens that will be covered with nanometer fibers capable of trapping pollutants may make breathing easier for smog-choked city dwellers. These fibers, made of nitrogen-containing polymers, are sprayed onto the grids using a spray method in which a stream of air disperses tiny droplets of a polymer solution while spraying. This creates a very thin layer of fibers with a nanometer diameter.
Scientists from Stanford University and Tsinghua University in Beijing reported in the beginning of 2017 in the journal Nano Letters on the development of a variety of polymers sprayed with this method (materials commonly used to make rubber gloves and tents) that can filter more than 90% of the harmful particulate matter that penetrates the lungs and normally passes through the usual window screens. The researchers sprayed these pollutant-absorbing nanofibers onto a flexible nylon mesh as it unrolled at a speed of nearly a meter per minute. They also coated the material on a metal-coated mesh and after extensive absorption, they removed the particles by wiping the layer with handkerchiefs.
In a field experiment conducted for 12 hours in a window in Beijing, under conditions of heavy haze, a mesh coated with nano-fibers of polyacrylonitrile filtered about 90% of the harmful particulate matter, which can cause lung cancer and heart disease. This is what is called a breath of fresh air.
for further reading
- Direct Blow-Spinning of Nanofibers on a Window Screen for Highly Efficient PM2.5 Removal. Bilal Khalid et al, Nano Letters, Vol 17, Issue 2, pages 1140–1148, 2017
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What an amazing haze there is in the picture from Beijing!
It is unbelievable how people are willing to live and tolerate such a thing without the restoration of a voice of protest. Masochists!
It also blocks most of the wind and air flow not only pollution and secondly, if someone lightly touches the nano material in the mesh then it loses functionality at the point of contact and is actually damaged due to the sensitivity of the nanometer structure.
It is mostly sad that even clean air cannot be breathed in certain places