氧化石墨烯纳米流体分散性及过冷特性研究

Investigation of dispersion and supercooling characteristics of graphene oxide nanofluids

以质量分数为0.05%的氧化石墨烯纳米流体为实验对象,测量了不同超声分散时间下氧化石墨烯纳米流体的粒度和Zeta电位分布。同时测定了降温过程中氧化石墨烯纳米流体的过冷度和相变时间,探讨了超声时间对氧化石墨烯纳米流体分散性和过冷特性的影响。实验结果表明,超声分散时间越长,分散性能越好,但在150min后,粒径和Zeta电位大小趋于稳定;且超声分散时间为150min时,过冷度较小,相变时间较短,分别为5.2℃和4870s。

The distribution of particle size and Zeta potential of graphene oxide nanofluid were measured at different ultrasonic dispersing time with mass fraction 0.05 % of graphene oxide nanofluids as the experiment subject. Besides, super- cooling degree and phase transformation time were also gauged in the cooling process,and the influence of ultrasonic disper- sing time on dispersion and supercooling characteristics of the nanofluids was studied. The results showed that the more ul trasonic dispersing time was taken, the dispersion was better, but after 150min, the particle size and Zeta potential of the nanofluids tended to be stable. In addition,at the time of 150min,the supercooling degree was lower and phase transforma- tion time was shorter,and the corresponding value was 5.2℃ and 4870s respectively.