Microwave drying equipment for aerogel to avoid structural collapse

Aerogel microwave drying equipment Prevent structural collapse

Microwave drying technology can effectively avoid the collapse of aerogel structure, maintain its nano porous characteristics, and significantly improve drying efficiency and material properties through uniform heating, rapid dehydration and low temperature control.

Aerogel is a kind of nano porous material with extremely low density, high porosity and excellent thermal insulation performance, but the drying link in its preparation process is very easy to lead to structural collapse, which affects its performance. Microwave drying equipment has become an ideal choice for drying aerogels due to its unique heating mechanism. The following is a detailed description of the principle and advantages:

1Microwave drying equipment for aerogel to avoid structural collapseThe principle of

Uniform heating to avoid local stress concentration

The drawbacks of traditional dryingTraditional drying methods, such as supercritical drying and atmospheric pressure drying, typically transfer heat from the surface to the interior, resulting in rapid evaporation of surface moisture and slow evaporation of internal moisture, creating an internal and external pressure difference that can easily cause structural collapse due to capillary forces or surface tension.

The advantages of microwave drying: Microwave can directly act on the water molecules inside the aerogel to make it evaporate synchronously, so that the internal and external temperature gradients are small and the pressure difference is significantly reduced, thus avoiding structural damage.

Quickly dehydrate and shorten drying time

The time-consuming problem of traditional drying: Supercritical drying requires a high-pressure environment, and atmospheric drying may take days or even weeks. Long time drying may lead to shrinkage or collapse of the aerogel skeleton.

Efficiency of Microwave Drying: The microwave heating speed is fast, which can complete the drying in a short time, reduce the structural relaxation time of the aerogel in the drying process, and maintain the integrity of its nano porous structure.

Low temperature drying to protect material properties

Thermal sensitivity of aerogel: High temperature may cause softening or sintering of aerogel framework, and destroy its porous structure.

Temperature control of microwave drying: Microwave drying can achieve low temperature drying (usually below 100 ℃) by adjusting the power and heating time to avoid the damage of high temperature to the aerogel.

Selective heating to reduce solvent residue

Microwave selectivity: Microwave can preferentially heat solvent molecules, promote their rapid volatilization, reduce residues, and avoid direct heating of the aerogel framework.