title: Textural and mechanical characteristics of carbon aerogels synthesized by polymerization of resorcinol and formaldehyde using alkali carbonates as basification agents.
abstract: 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.
authors.affiliation: Department of Inorganic Chemistry, Faculty of Sciences, University of Granada, Avda. Fuentenueva s/n, 18071, Granada, Spain.
authors.forename: Sergio
authors.initials: S
authors.lastname: Morales-Torres
authors.forename: Francisco José
authors.initials: FJ
authors.lastname: Maldonado-Hódar
authors.forename: Agustín Francisco
authors.initials: AF
authors.lastname: Pérez-Cadenas
authors.forename: Francisco
authors.initials: F
authors.lastname: Carrasco-Marín