Self-Organization of Large Alumina Platelets and Silica Nanoparticles by Heteroaggregation and Sedimentation: Toward an Alternative Shaping of Nacre-Like Ceramic Composites,Langmuir

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Self-Organization of Large Alumina Platelets and Silica Nanoparticles by Heteroaggregation and Sedimentation: Toward an Alternative Shaping of Nacre-Like Ceramic Composites
Langmuir ( IF 3.7 ) Pub Date : 2020-03-25 , DOI: 10.1021/acs.langmuir.0c00170
Manuella Cerbelaud ₁ , Mariana Muñoz ₁ , Fabrice Rossignol ₁ , Arnaud Videcoq ₁

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Nacre-like ceramic composites are of importance in a wide range of applications, because of their mechanical properties, combining high mechanical strength and high fracture toughness. Those mechanical properties are the result of strongly aligned platelets glued in a matrix. Different methods exist to shape such a “brick-and-mortar” hierarchical structure. In this paper, we propose to use the phenomenon of heteroaggregation between silica nanoparticles and large alumina platelets. Experimental and numerical results show that silica nanoparticles can adsorb on alumina platelets with good distribution. This adsorption promotes the deagglomeration of alumina that can self-organize in layers by sedimentation. This phenomenon can be exploited to shape alumina–silica nacre-like composites.

中文翻译：

大氧化铝薄片和二氧化硅纳米粒子通过异质聚集和沉淀的自组织：像珍珠母状陶瓷复合材料的另一种形状。

像珍珠母一样的陶瓷复合材料由于其机械性能，兼具高机械强度和高断裂韧性，因此在广泛的应用中具有重要意义。这些机械性能是粘合在基质中的强对齐血小板的结果。存在不同的方法来塑造这种“实体”分层结构。在本文中，我们建议利用二氧化硅纳米颗粒与大尺寸氧化铝薄片之间的杂聚现象。实验和数值结果表明，二氧化硅纳米粒子可以良好的分布吸附在氧化铝片上。这种吸附促进了氧化铝的解聚，该氧化铝可以通过沉降而自成层地自组织。可以利用这种现象来成型氧化铝-二氧化硅珍珠母状复合材料。

更新日期：2020-03-26

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