Patent ID: 8383238
Filing Date: 2013-02-26
Classification: C01B,C04B,C23C,Y10T

Abstract:
1. Discrete coated porous particles comprising substrate particles each encapsulated in a protective, durable coating of a coating material selected from the group consisting of metal oxides, wherein the substrate particles are made of a material selected from the group consisting of amorphous silica aerogels, amorphous silica xerogels, carbon aerogels and carbon xerogels, and having a porosity of at least 80%, each of the substrate particles has a plurality of pore chambers filled with a gas which replaces air originally present in the pore chambers and has a thermal conductivity no higher than 0.0002598 W/cmK, and each substrate particle also has a plurality of pore openings on its surface which are sealed by the coating, the substrate particle has a particle size from 1 μm to 5 mm, the coating has a thickness of at most 0.5 mm, and the coating has a total volume of not more than 20% of the volume of the substrate particle.