Preparation of low-density carbon aerogels by ambient pressure drying

With the addition of hexamethylenetetramine (HMTA) and alcohol as solvent, an ambient pressure drying technique was developed for the fabrication of low-density organic aerogels and related carbon aerogels. When a suitable ratio of resorcinol to HMTA (R/H ratio) and ratio of resorcinol to solvents (...

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Bibliographic Details
Published in:Carbon (New York) 2004, Vol.42 (10), p.2033-2039
Main Authors: Wu, Dingcai, Fu, Ruowen, Zhang, Shuting, Dresselhaus, Mildred S, Dresselhaus, Gene
Format: Article
Language:English
Subjects:
A. Carbon aerogel
B. Ambient pressure drying
B. Catalyst
Chemistry
Colloidal state and disperse state
Cross-disciplinary physics: materials science
rheology
D. Density, texture, porosity
Exact sciences and technology
Fullerenes and related materials
diamonds, graphite
General and physical chemistry
Materials science
Physics
Porous materials
Specific materials
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Summary:With the addition of hexamethylenetetramine (HMTA) and alcohol as solvent, an ambient pressure drying technique was developed for the fabrication of low-density organic aerogels and related carbon aerogels. When a suitable ratio of resorcinol to HMTA (R/H ratio) and ratio of resorcinol to solvents (R/S ratio) are selected, the low-density alco-gels obtained can be dried under ambient pressure conditions without observable shrinkage. The addition of HMTA increases the size of carbon nano-particles and the pore size of the aerogels that are produced. The carbon aerogels prepared in this work have similar nano-particle structures typical of the aerogels prepared with CO2 or by the isopropanol supercritical drying technique.
ISSN:0008-6223
1873-3891
DOI:10.1016/j.carbon.2004.04.003