Freeze-drying method as a new approach to the synthesis of polyurea aerogels from isocyanate and water

Polyurea aerogels can be successfully synthesized via a sol–gel process followed by an eco-friendly freeze-drying method. The resulting aerogels have excellent thermal, mechanical properties, and great processability for application in various industries. Freeze-drying method can be used as a cheaper method to obtain aerogels with properties comparable to materials obtained via a supercritical drying method.