氧化石墨烯及其导热纳米流体的制备与性能

Preparation and properties of graphene oxide and theirthermal conductivity nanofluids

以石墨为原料,经XRD、TEM及IR表征证明采用强氧化法在实验室成功合成了氧化石墨烯。经亲水性实验表明该氧化石墨烯产品为亲水性材料,其接触角为31.6°;SEM表征表明该氧化石墨烯产品在乙二醇中的分散性好。在没有分散剂的情况下合成了氧化石墨烯/乙二醇导热纳米流体,并确定出氧化石墨烯在常温下分散在乙二醇中的最佳质量分数为0.1%,其稳定时间可达15d以上。在25℃时测得分别以蒸馏水、乙二醇和丙二醇为基液的质量分数为0.1%的氧化石墨烯纳米流体的热导率分别增加27.2%,54.2%和55.6%。

Graphene oxide was successfully synthesized in the laboratory by the strong oxidation method using graphite as raw materials,and that was proved by XRD,TEM and IR.The tests show that graphene oxide is a hydrophilic material,and the contact angle of 31.6°.SEM show that the dispersion of graphene oxide in ethylene glycol is good.graphene oxide/ethylene glycol nanofluids was synthesized without chemical dispersants at room temperature,and it was determined that the optimum mass fraction of graphene oxide which dispersed in ethylene glycol was 0.1%.and stability time of nanofluids is up to half a month.The enhancement of thermal conductivity for graphene oxide nanofluids at 25 ℃for a mass fraction of 0.1% are up to 27.2%,54.2%,and55.6%,when the base fluids are distilled water,ethylene glycol and propyl glycol,respectively.