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Liquid Foam Templates Associated with the Sol-Gel Process for Production of Zirconia Ceramic Foams
Institute of Chemistry, Universidade Estadual Paulista—UNESP, P.O. BOX 355, Araraquara 14800-900, Brazil
* Author to whom correspondence should be addressed.
Received: 27 February 2013; in revised form: 23 April 2013 / Accepted: 6 May 2013 / Published: 10 May 2013
Abstract: The unique properties of ceramic foams enable their use in a variety of applications. This work investigated the effects of different parameters on the production of zirconia ceramic foam using the sol-gel process associated with liquid foam templates. Evaluation was made of the influence of the thermal treatment temperature on the porous and crystalline characteristics of foams manufactured using different amounts of sodium dodecylsulfate (SDS) surfactant. A maximum pore volume, with high porosity (94%) and a bimodal pore size distribution, was observed for the ceramic foam produced with 10% SDS. Macropores, with an average size of around 30 μm, were obtained irrespective of the SDS amount, while the average size of the supermesopores increased systematically as the SDS amount was increased up to 10%, after which it decreased. X-ray diffraction analyses showed that the sample treated at 500 °C was amorphous, while crystallization into a tetragonal metastable phase occurred at 600 °C due to the presence of sulfate groups in the zirconia structure. At 800 and 1000 °C the monoclinic phase was observed, which is thermodynamically stable at these temperatures.
Keywords: ceramic foam; liquid-foam templates; sol-gel; surfactant; thermal treatment
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Beozzo, C.C.; Alves-Rosa, M.A.; Pulcinelli, S.H.; Santilli, C.V. Liquid Foam Templates Associated with the Sol-Gel Process for Production of Zirconia Ceramic Foams. Materials 2013, 6, 1967-1979.
Beozzo CC, Alves-Rosa MA, Pulcinelli SH, Santilli CV. Liquid Foam Templates Associated with the Sol-Gel Process for Production of Zirconia Ceramic Foams. Materials. 2013; 6(5):1967-1979.
Beozzo, Cristiane C.; Alves-Rosa, Marinalva A.; Pulcinelli, Sandra H.; Santilli, Celso V. 2013. "Liquid Foam Templates Associated with the Sol-Gel Process for Production of Zirconia Ceramic Foams." Materials 6, no. 5: 1967-1979.