Textural and mechanical characteristics of carbon aerogels synthesized by polymerization of resorcinol and formaldehyde using alkali carbonates as basification agents

• Type: Article in International Scientific Journal
• Date: 2010

Authors

morales-torres, s (Author) FEUP; maldonado-hodar, fj (Author) Other; perez-cadenas, af (Author) Other; carrasco-marin, f (Author) Other

Journal

Title: Physical Chemistry Chemical Physics

Vol. 12 No. 36

Pages: 10365-10372

ISSN: 1463-9076

Publisher: Royal Society of Chemistry

Indexing

ISI Web of Knowledge - 14 Citations

Scopus - 11 Citations

Other information

Authenticus ID: P-008-PHW

DOI: 10.1039/c003396k

Abstract (EN): Five organic aerogels were prepared simultaneously by polycondensation of resorcinol and formaldehyde using different alkali carbonates (M(2)CO(3), M = Li, Na, K, Rb and Cs) as basification agents. The gelation time depended on the carbonate used, increasing from Li(2)CO(3) to Cs(2)CO(3). The porosity of the samples is defined during this process, when the three-dimensional packing of primary particles is formed. The slower the gelation, the greater the overlapping of primary particles and the formation of clusters, leading to a mechanical reinforcement of the samples and the progressive displacement of their pore size distribution (PSD) towards larger pores. Carbonization produces certain shrinkage of the structure and increases the microporosity and the Young modulus of the samples. Carbon aerogels change from mesoporous to macroporous materials as the counter-ion size of the carbonate increases.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8