Researchers have found that it is possible to protect objects from impact or explosion with a mixture of nanoporous powdery material and a non-wetting liquid.
The authors of the new work from the National Research Nuclear University “MEPhI” studied the properties of mixtures and found that they can quickly absorb the energy of an external impulse action. In addition, if we proceed from the material, as well as its quantity, then it is possible to control the effort on the protected object.
The point is to use the feature of filling porous materials with non-wetting liquids: this is only possible if the pressure is above atmospheric.
It is also important that liquid can flow out of the pores of the material with decreasing pressure. The difference between the pressures at which the liquid flows into and out of the pores (pressure hysteresis) determines the fraction of the energy absorbed by such a mixture. The greater the difference, the greater the proportion of absorbed energy.
Anton Belogorlov, Associate Professor, Institute of Nanotechnology in Electronics, Spintronics and Photonics (INTEL), National Research Nuclear University MEPhI
As a result, the mixture heats up only slightly compared to the energy that they have absorbed, and accordingly the temperature of the device does not rise.
The authors note that other systems with a similar operating principle suffer from overheating. The new model offers to combine high specific energy consumption – up to 20 J per gram of material – a certain amount of effort on the protected object, reusability and low heat generation.
Now the authors are engaged in studying new materials for mixtures, as well as their properties.