Activated carbon in the sole

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Activated carbon has special properties, which is why this substance is also used as a filter. You can often see insoles with an activated carbon layer in shops, which advertise an odor-inhibiting effect. But how does this come about?

Insoles with activated charcoal prevent unpleasant smells.
Insoles with activated charcoal prevent unpleasant smells.

The properties of activated carbon

  • Like normal charcoal, activated charcoal also consists of carbon atoms. Occasionally other elements may also be contained as impurities if these are not medical.
  • In contrast to normal coal, it is characterized by its structure. It consists of an extremely large number of small pores between the carbon atoms. The porous spatial structure can be compared to that of a sponge.
  • The pore size can vary from micropores that are smaller than 2 nm to macropores that are larger than 50 nm. Since different pore sizes are possible, the type of activated carbon can be adapted to the respective place of use and the conditions there.
  • Due to the many pores, this material has an extremely large internal surface. Depending on the structure and structure, the inner surface is between 300 and 2000 m² / g.
  • The many small openings and pores act like a kind of sieve. These intercept molecules that are larger than the openings. That is why this special form of carbon is also used in air filter systems and for cleaning waste water.
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Effect in the sole

  • Due to the porous structure of the activated carbon in the insole, sweat and water can easily be conducted away from the foot. This prevents unpleasant ones Smells, as bacteria that cause foot odor need a warm and humid environment. This is prevented by the removal of the liquid. To get this effect, you should use the shoes and ventilate the soles well after wearing them.
  • Furthermore, unpleasant fragrances can get stuck in the activated carbon layer of the sole. They are no longer released into the air and can therefore no longer be perceived. However, this effect diminishes with the time of use, as more and more pores clog and the activated charcoal is eventually saturated. Then the only thing that helps is buying new insoles.

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