The nanoparticles are tiny fragments of the order of a billionth of a meter. To get an idea of what this scale represents, there is as much difference between the Earth and an apple as between an apple and a nanoparticle. This is to say if a nanoparticle is very small. We are there in the infinitely small!
Modified boiling point
At the atomic scale, materials change their physical properties. But what is this phenomenon due to? The fact that the surface of a material plays a larger role as its size decreases.
Take the case of gold. The nanoparticules d’or are completely different from the gold that can be observed. They change color, the gold is then red-violet and its boiling temperature (which was thought to be constant) is also modified.
Another example: carbon. Fragile in pencil leads, it becomes a hundred times more resistant than steel at the nanoscale.
Today, we are rightly asking the question: is it dangerous for health? Remember that there are artificial nanoparticles created by humans and natural nanoparticles: dust produced by volcanoes or forest fires, for example. Scientists are still studying these effects of nanoparticles to determine the real health consequences.
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