【作者】 王钰金； 焦体峰； 张庆瑞； 周靖欣； 高发明；

【Author】 Yujin Wang;Tifeng Jiao;Qingrui Zhang;Jingxin Zhou;Faming Gao;Hebei Key Laboratory of Applied Chemistry,School of Environmental and Chemical Engineering,Yanshan University;

【机构】 燕山大学环境与化学工程学院河北省应用化学重点实验室；

【摘要】 有机凝胶是一类重要的软材料,有机溶剂在其中通过胶凝剂固定。近年来小分子凝胶成为软物质研究领域的热点,由于其科学价值和在生物医学等领域的潜在应用,包括组织工程,药物控制释放,医疗植入物。小分子有机凝胶通常被认为是超分子凝胶,凝胶分子自组装成三维网状结构,通过非共价键作用,例如氢键、?-?堆积、范德华力、偶极作用、配位作用、疏溶剂作用、主客交互作用等,溶剂被限制在其中。此外,氧化石墨烯(GO),平面与边缘连有含氧基团的单层氧化石墨,由于其优异的结构和热学性能,使其成为有效的纳米填料,比碳纳米管更得人们青睐。在本文中,我们设计合成了不同系列阳离子两亲表面活性剂,分别与GO混合,在不同有机溶剂中测试了复合物的凝胶能力,并且对GO及所得凝胶进行了形貌扫描和光谱表征。从氧化石墨烯的形貌图中可以看出,GO表面平滑,具有较大的比表面积。层间距d=1.03 nm,与理论值1 nm非常接近,可以认为是单层的氧化石墨烯;FT-IR曲线的吸收峰说明在GO表面及边缘有大量含氧基团,可以在复合凝胶中形成大量分子间氢键;由干凝胶的形貌图可以看出,大多为片层状,这与XRD的结果一致。在阳离子两亲物/GO复合凝胶中,分子间氢键作用、?-?相互作用和范德华力是主要的驱动力。目前工作对于具有GO复合新型有机凝胶剂和软材料的设计提供了新的思路和研究基础。更多还原

【Abstract】 Graphene,an atom thick graphite sheet,has received a great deal of attentions because of its unique electronic,thermal and mechanical properties etc.Recent works have demonstrated that selfassembly is a powerful technique for constructing hierarchical graphene oxide(GO)-based nanomaterials with novel functions.In particular,graphene oxide can easily be functionalized through both covalent and non-covalent bonding;thereby making graphene oxide an important building block for the synthesis of new materials.In this paper,we have demonstrated the formation of nanostructured organogels based on selfassembly of cationic amphiphile-GO composites in common organic solvents.Three used cationic compounds contained different ammonium or pyridinium headgroups in molecular structures,which showed distinct ?-? stacking and spatial hindrance in self-assembly process.Interestingly,it is found that nanostructures differ in different organic solvents as evidenced by morphological and spectral studies.The diversity of nanostructures in the organogels results from the variation of headgroups of amphiphiles coupled to GO.Furthermore,the mechanism associated with nanostructure formation is proposed.Soft matters fabricated through the gelation of amphiphile-GO might offer a good alternative for design and development of GO-based materials and devices.更多还原