摘要
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p H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p H值依赖自组装行为。其中,石墨烯所含羧酸基团在不同p H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 applications.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 relationships 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.
出处
《新型炭材料》
SCIE
EI
CAS
CSCD
北大核心
2015年第1期30-40,共11页
New Carbon Materials
基金
National Natural Science Foundation of China(21003149,21076218)~~
关键词
石墨烯结构
石墨烯水凝胶
石墨烯骨架
三维
自组装
构效关系
Graphene architectures
Graphene hydrogels
Graphene framework
Three-dimension
Self-assembly
Structure-activity
