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Comparison of low and high pressure infiltration regimes on the density and highly porous microstructure of ceria ecoceramics made from sustainable cork templates
Journal of the European Ceramic Society ( IF 5.7 ) Pub Date : 2018-12-01 , DOI: 10.1016/j.jeurceramsoc.2018.11.050
Rui M. Novais , Robert C. Pullar

Cork templates were used to produce lightweight bulk biomimetic ecoceramic (environmentally conscious ceramic) monoliths. Bulk/monolithic ceramics are vital for many applications, i.e. energy materials and fuel cells. Using simple and flexible, aqueous green-chemistry procedures, for the first time the influence of infiltration regime, number of infiltration cycles and sintering temperature on ecoceramic density and microstructure was studied. This lightweight three-dimensionally ordered macroporous (3DOM) CeO2 preserved the hexagonal cellular structure of cork, but unlike the wood, the rear cell walls were open, greatly increasing open porosity. Higher sintering temperatures (1600 instead of 1000 °C) were required to produce cm size monolithic ecoceramics mechanically strong enough to be handled. The infiltration regime and number of infiltration cycles affected density and porosity. Lower infiltration pressure led to higher porosity ecoceramics (3.3–5.7%), which may favour catalytic performance, showing the possibility of tailoring porosity and specific surface area by modifying the number of infiltration cycles.



中文翻译:

可持续软木模板制成的二氧化铈生态陶瓷的低压和高压渗透方式对密度和高孔隙度微结构的比较

软木模板用于生产轻质的仿生生态陶瓷(环保陶瓷)整体料。大块/整体陶瓷对于许多应用(例如能源材料和燃料电池)至关重要。使用简单,灵活的水性绿色化学程序,首次研究了浸润方式,浸润循环次数和烧结温度对生态陶瓷密度和微观结构的影响。这种轻巧的三维有序大孔(3DOM)CeO 2保留了软木塞的六角孔结构,但与木材不同,后孔壁是开放的,大大增加了开放孔隙率。需要更高的烧结温度(1600而不是1000°C)来生产机械强度足以处理的cm尺寸的整体式生态陶瓷。渗透方式和渗透次数影响密度和孔隙率。较低的渗透压力导致较高孔隙度的生态陶瓷(3.3-5.7%),这可能有利于催化性能,这表明可以通过修改渗透周期数来调整孔隙率和比表面积。

更新日期:2018-12-01
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