离子交联石墨烯相变复合材料的研究

Research on ion-crosslinked graphene phase change composites

在氧化石墨烯和膨胀石墨中掺入不同价态的金属离子,通过水热法制备了混杂三维网状石墨烯。并以石蜡为相变材料,通过浸渍法得到了石墨烯相变复合材料。对其进行扫描电镜、红外光谱仪和示差扫描量热仪等测试表征。结果表明,3种金属离子都可明显提高复合相变材料的导热性能。此外,与另外两种离子相比,二价Mg^2+的效果最为优异。在掺入Mg^2+的混杂三维网状石墨烯的微观结构发现了其明显的交联现象,显著提高相变材料热导率。

Graphene oxide and expanded graphite were doped with metal ions of different valence states,then hybrid three-dimensional network graphene was prepared by hydrothermal method.At last,graphene phase change composite was obtained by using paraffin as the phase change material through impregnation.The scanning electron microscope,infrared spectrometer and differential scanning calorimeter were used to test and characterize the composite.The results show that these metal ions can apparently improve the thermal conductivity of phase change composite.In addition,compared with the other two ions,the effect of the divalent Mg^2+ions is the most excellent.The obvious cross-linking phenomenon is found in the microstructure of the mixed three-dimensional network graphene doped with Mg^2+ions,which improves the thermal conductivity of phase change materials remarkably.