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

• Tipo: Artigo em Revista Científica Internacional
• Data: 2010

Autores

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

Revista

Título: Physical Chemistry Chemical Physics

Vol. 12 Nº 36

Páginas: 10365-10372

ISSN: 1463-9076

Editora: Royal Society of Chemistry

Indexação

ISI Web of Knowledge - 14 Citações

Scopus - 11 Citações

Outras Informações

ID Authenticus: 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.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 8