author = "Campos, Tiago M. B. and Cividanes, Luciana S. and Machado, 
                         Jo{\~a}o Paulo Barros and Simonetti, Evelyn A. N. and Rodrigues, 
                         Liana A. and Thim, Gilmar P.",
          affiliation = "{Instituto Tecnol{\'o}gico de Aeron{\'a}utica (ITA)} and 
                         {Instituto Tecnol{\'o}gico de Aeron{\'a}utica (ITA)} and 
                         {Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Tecnol{\'o}gico de Aeron{\'a}utica (ITA)} and {Universidade do 
                         Vale do Para{\'{\i}}ba (UNIVAP)} and {Instituto Tecnol{\'o}gico 
                         de Aeron{\'a}utica (ITA)}",
                title = "Mullite crystallization using fully hydrolyzed silica sol: the 
                         gelation temperature influence",
              journal = "Journal of Sol-Gel Science and Technology",
                 year = "2014",
               volume = "1",
               number = "1",
                pages = "100--107",
                month = "Feb.",
             keywords = "mullite, solgel, ethylene glycol, crystallization.",
             abstract = "Mullite is an aluminosilicate widely used as a structural material 
                         for high temperature applications. This paper studies the effect 
                         of the gelation temperature on the synthesis of two mullite 
                         precursors: polymeric and colloidal silica, using both in 
                         fully-hydrolyzed silica sol, derived from sodium silicate. The 
                         gels were synthesized using aqueous silicic acid and aluminum 
                         nitrate. Ethylene glycol was added into polymeric gels. Two 
                         gelation temperatures were used: 80 and 100 C. In the polymeric 
                         precursor, the increasing of the gelation temperature caused an 
                         increase in the silica incorporation inside the mullite 
                         crystalline lattice at 1,000 C, and it also generated an increase 
                         in the reaction extent at all calcination temperatures. In the 
                         colloidal precursors, these effects were more intense than in the 
                         polymeric precursors in terms of yield. Colloidal samples calcined 
                         at 1,250 C crystallized cristobalite and alpha alumina in 
                         addition to mullite when they were previously gelled at 80 C. On 
                         the other hand, the same sample gelled at 100 C led to only 
                         crystallized mullite. The reaction extent increased by more than 
                         20 % for colloidal samples gelled at 100 C compared to colloidal 
                         samples gelled at 80 C (calcined at 1,250 C). This increase was 
                         due to the almost total incorporation of alumina and silica in the 
                         crystalline lattice of mullite.",
                  doi = "10.1007/s10971-014-3285-9",
                  url = "http://dx.doi.org/10.1007/s10971-014-3285-9",
                 issn = "0928-0707 and 1573-4846",
                label = "lattes: 5076862030728693 3 CamposCiMaSiRoTh:2014:GeTeIn",
             language = "en",
           targetfile = "art_10.1007_s10971-014-3285-9-1.pdf",
                  url = "http://link.springer.com/article/10.1007/s10971-014-3285-9",
        urlaccessdate = "04 dez. 2020"