Abstract

Combination of sol–gel and sonochemical techniques is suggested for producing a nanostructured graphene–alumina hybrid, which is a promising raw material for manufacturing fine-grained ceramics. This study focuses on the use of dodecylamine both in the sol–gel synthesis of Al-containing particles and in sonochemical graphene exfoliation. It has been shown that, when forming graphene–alumina composite in a reaction mixture of Al-containing sol and graphene suspension, graphene sheets take part as a template in the formation of a hybrid structure. Graphene sheets orient sol particles on their surface due to van der Waals interaction and control growth and direction of oligomeric gel chains. The graphene sheets limit the growth of Al-containing particles, which leads to an increase in the specific surface of the hybrid as compared to an alumina powder sourced from the same sol. The proposed approach enables the preparation of chemically homogeneous composite nanopowders with uniform distribution of components.

摘要

建议将溶胶-凝胶技术与声化学技术相结合来生产纳米结构的石墨烯-氧化铝杂化物，这是一种用于制造细粒陶瓷的有前途的原材料。这项研究着重于十二烷基胺在含铝颗粒的溶胶-凝胶合成和声化学石墨烯剥落中的使用。研究表明，当在含铝溶胶和石墨烯悬浮液的反应混合物中形成石墨烯-氧化铝复合材料时，石墨烯片将作为模板形成杂化结构。石墨烯片由于范德华相互作用而使溶胶颗粒在其表面上取向，并控制低聚凝胶链的生长和方向。石墨烯片限制了含Al颗粒的生长，与源自相同溶胶的氧化铝粉末相比，这导致了杂化物比表面积的增加。所提出的方法使得能够制备具有均匀分布的组分的化学均质的复合纳米粉末。