Aerosol Gelation: Synthesis of a Novel, Lightweight, High Specific Surface Area Material
Titel:
Aerosol Gelation: Synthesis of a Novel, Lightweight, High Specific Surface Area Material
Auteur:
Dhaubhadel, Rajan Gerving, Corey S. Chakrabarti, Amitabha Sorensen, Christopher M.
Verschenen in:
Aerosol science and technology
Paginering:
Jaargang 41 (2007) nr. 8 pagina's 804-810
Jaar:
2007-08
Inhoud:
We demonstrate that an aerosol can gel. This gelation is then used for a one-step method to produce an ultralow density porous carbon material. This material is named an aerosol gel because it is made via gelation of particles in the aerosol phase. The carbon aerosol gels have high specific surface area (200-350 m2/g), an extremely low density (2.5-5.0 mg/cc) and a high electrical conductivity, properties similar to conventional aerogels. The primary particles of the carbon aerosol gels are highly crystalline with a narrow (002) graphitic X-ray diffraction peak. Key aspects to form a gel from an aerosol are large volume fraction, ca. 10-4 or greater, and small primary particle size, 50 nm or smaller, so that the gel time is fast compared to other characteristic times.