A microwave-based method for the synthesis of carbon xerogel spheres

Carbon xerogel spheres with millimeter-scale diameters were synthesized by a simple process using microwave radiation as the heating source. Using this type of heating it is possible to establish the gelation point of different resorcinol–formaldehyde solutions and stop the gelation step of the mate...

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Bibliographic Details
Published in:Carbon (New York) 2012-08, Vol.50 (10), p.3555-3560
Main Authors: Menéndez, J.A., Juárez-Pérez, E.J., Ruisánchez, E., Calvo, E.G., Arenillas, A.
Format: Article
Language:English
Subjects:
Carbon
Chemistry
Colloidal state and disperse state
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Fullerenes and related materials
diamonds, graphite
Gelation
General and physical chemistry
Heating
Materials science
Microwaves
Physics
Porous materials
Specific materials
Surface layer
Synthesis
Texture
Xerogels
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Description
Summary:Carbon xerogel spheres with millimeter-scale diameters were synthesized by a simple process using microwave radiation as the heating source. Using this type of heating it is possible to establish the gelation point of different resorcinol–formaldehyde solutions and stop the gelation step of the material at the exact time of gelation. Organic gel spheres can then be directly obtained by stirring in a silicone bath at 80°C. Finally, carbonization is performed to obtain carbon xerogels with a spherical shape. The size and porous texture of the spheres can be controlled by adjusting the synthesis conditions.
ISSN:0008-6223
1873-3891
DOI:10.1016/j.carbon.2012.03.027