Why install an additional layer of thermal insulation on a brick wall when you can integrate it into the material itself? Guided by this principle, the Swiss company Empa selected a special "filling" for the bricks - it was airgel. A material in which the liquid component of the gel is replaced with regular air.
As you know, air conducts heat poorly, and therefore the thermal insulation properties of such bricks are almost an order of magnitude higher than that of their conventional, solid counterparts. Or a third better than a hollow brick filled with perlite - this means that in order to achieve the required thermal insulation parameters, it will be necessary to build a wall of proportionally smaller thickness.
The main merit of the Swiss is not in the concept of "aero bricks", but in its implementation. They have developed a paste-like material that contains large amounts of airgel particles. And can be extruded, poured into any suitable containers or voids in ordinary hollow bricks. That is, both the production and use of such building materials are quite convenient and efficient.
There is only one drawback: the price. Airgel is an advanced, innovative and expensive material to manufacture. In order to isolate a section of the wall with an area of 1 sq. M. and one brick thick, you will need to spend $ 521. Therefore, there is no need to talk about the imminent appearance of aero bricks in the construction industry, but the developers cherish the hope that, as demand, the technology will develop and become cheaper.