功能化石墨烯掺杂熔盐的制备及性能研究

通过物理混合方法，在由硝酸钾、硝酸钠、硝酸锂组成的熔盐中加入不同量的氧化石墨烯（GO）、钠化石墨烯（Na-GO）和钾化石墨烯（K-GO），制得3个系列熔盐复合材料，考察功能化石墨烯的含量，氧化、钠化、钾化对熔盐复合材料熔点、热分解温度、热传导率、黏度等物化性质的影响。结果发现在添加量为0.1%~5%范围内，随着功能化石墨烯添加量的增加，熔盐复合材料的熔点先逐渐下降，后下降趋平缓，其中Na-GO对熔盐熔点下降作用最为明显；熔盐复合材料的起始分解温度随着功能化石墨烯添加量的增加而提高。GO、Na-GO和K-GO的加入提高了熔盐复合材料的热传导率，降低了其流动性能。综合考虑各种因素，在熔盐中添加0.5%~1%的Na-GO，所得熔盐复合材料的综合性能较好。

Studies on preparation and properties of functionalizing graphene doped molten salt composites

Three series of molten salt composites were prepared by adding the different contents of graphene oxide（GO）， sodium graphene（Na-GO），and potassium graphene（K-GO） into the molten salts comprised with potassium nitrate（KNO3）， sodium nitrate（NaNO3），and lithium nitrate（LiNO3） via physical blending.The influences of the functionalizing graphene content，oxidation，sodium-and-potassium treatment of graphene on the melting point，thermal decomposition temperature， thermal conductivity，and viscosity of molten salt composites were investigated.When the functionalizing graphene content was at 0.1%~5%，the melting point of molten salt composites decreased，then changed slightly with the increase of the functionalizing graphene content.Meanwhile，the addition of Na-GO decreased the melting point of molten salt composites more than that of GO and K-GO.Moreover，the thermal decomposition temperature of molten salt composites increased with the increase of the functionalizing graphene content.The addition of GO，Na-GO，and K-GO increased the thermal conductivity and reduced the mobility of molten salt composites.The molten salt composites filled with 0.5%~1% of Na-GO had favorable comprehensive performance based on the above analysis.