Stained glass windows of medieval churches were not just decoration — when exposed to sunlight, they act as air purifiers. This discovery was made by the Queensland University of Technology Professor Zhu Huai Yong (Zhu Huai Yong), according to a press release on the official website of the university.
The reason for this unusual feature was the golden stained glass paints used in painting. It was found that the glass arranged in the gold particle whose size is several nanometers (10-9 meters).
Light being naturally electromagnetic radiation interacts with the magnetic field of the nanoparticles, which produce electrons of its atoms. The natural frequency of the magnetic field of a particle depends on its size. And if the size of the right, there is a resonance — the phenomenon of a sharp increase in the amplitude of the vibrations caused by the coincidence of the natural frequency of vibration and frequency of the external influence.
As a result, fluctuations in the magnetic field becomes so strong that they can lead to destruction of some of the compounds of the molecules near gold nanoparticles — e.g., so-called Volatile Organic Compounds. This class contains harmful substances secreted by fresh paint, new furniture. According to Professor Yoon, as a result of the "work" of the stained glass windows of such compounds are obtained harmless substance and a small amount of carbon dioxide.
The interest of scientists to the gold nanostructures is greatly increased. This is due to the fact that gold is an important catalyst for many chemical reactions, and catalytic properties of gold particles is much higher than the "chunks" of gold.