Beozzo Cristiane Carolina, Alves-Rosa Marinalva Aparecida, Pulcinelli Sandra Helena, Santilli Celso Valentim
Institute of Chemistry, Universidade Estadual Paulista-UNESP, P.O. BOX 355, Araraquara 14800-900, Brazil.
Materials (Basel). 2013 May 10;6(5):1967-1979. doi: 10.3390/ma6051967.
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.
泡沫陶瓷的独特性能使其能应用于多种领域。本研究采用与液体泡沫模板相关的溶胶 - 凝胶法，探究了不同参数对氧化锆泡沫陶瓷制备的影响。评估了热处理温度对使用不同量十二烷基硫酸钠（SDS）表面活性剂制备的泡沫的多孔性和晶体特性的影响。对于添加10% SDS制备的陶瓷泡沫，观察到其具有最大的孔体积、高孔隙率（94%）以及双峰孔径分布。无论SDS用量如何，均可获得平均尺寸约为30μm的大孔，而超大介孔的平均尺寸随着SDS用量增加至10%而系统性增大，之后减小。X射线衍射分析表明，在500℃处理的样品为非晶态，而由于氧化锆结构中存在硫酸根基团，在600℃时结晶为四方亚稳相。在800℃和1000℃时观察到单斜相，该相在这些温度下热力学稳定。
