通过水热法自组装制备出块体石墨烯水凝胶材料，其具有优异的机械性能和弹性；同时发现在调节水凝胶机械性能方面，控制反应的pH值要比常规的反应时间和反应物的浓度更有效。其次，系统研究了石墨烯水凝胶的结构_性能关系和自组装行为。研究发现，在水热条件下，石墨烯具有pH值依赖自组装行为。其中，石墨烯所含羧酸基团在不同pH值下的电离状态有所不同，进而导致石墨烯自组装行为的差异。将石墨烯独特的组装行为与其分子结构和胶体相互作用相互关联，对于设计新型的、多功能的、良好机械性能的石墨烯结构具有重要指导作用。
Fabricating self_supporting, three dimensional graphene macroscopic structures from two dimensional graphene sheets by self_assembly has been an intriguing subject in exploring the performance of graphene structures for practical advanced applica_tions. Monolithic graphene hydrogels ( GHs) with quite good mechanical properties and excellent resilience were self_assembled from graphene oxide ( GO) dispersions under hydrothermal conditions by changing the pH value. The structure_property relation_ships and the self_assembly behavior of GHs were investigated. It was found that the formation of GHs was pH_dependent. The charge state of carboxyl groups on the graphene was the key factor that influenced the balance of attraction and repulsion interactions of the GO and consequently determined the self_assembly behavior. Both the graphene molecular structure and colloidal interactions were correlated with the unique self_assembly behavior, which can be used to design graphene arrangements with various structures, functions and mechanical properties. This method is superior to the conventional method that adjusts the concentration and reduction time of the GO dispersion.
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