Jin Can, Wu Qibai, Zhang Haiyan, Yang Guoqiang, Yuan Xingxing, Fu Huiqing
School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, People's Republic of China.
Guangdong Provincial Key Laboratory of Functional Soft Condensed Matter, Guangzhou 510006, People's Republic of China.
Nanotechnology. 2021 Mar 26;32(24). doi: 10.1088/1361-6528/abed77.
In the present study, a novel silver nanoparticles-decorated three-dimensional graphene-like porous carbon (Ag/3D GPC) nanocomposite has been synthesized via the method of carbonization and reduction of silver ions at the same time. This Ag/3D GPC nanocomposite possess an interconnected network of well crystalized and submicron-sized macropores with thin graphene walls of several nanometers, where silver nanoparticles distributing uniformly. The water based and ethylene glycol based Ag/3D GPC hybrid nanofluids have been prepared without any surfactant. The hybrid nanofluids with low concentration (<0.8 wt%) can be steadily dispersed for more than six months. The thermal conductivity enhancement for the nanofluids with 0.1 wt% can reach 10.3% and 8.8% at 25 °C compared with pure water and ethylene glycol, respectively. The viscosity of nanofluids is investigated, the temperature dependence of the dynamic viscosity obeys an Arrhenius-like behavior. The prepared Ag/3D GPC hybrid nanofluids with good stability and thermal conductivity are promisingly considered to be used in heat transfer field.
在本研究中，通过同时碳化和还原银离子的方法合成了一种新型的银纳米颗粒修饰的三维类石墨烯多孔碳（Ag/3D GPC）纳米复合材料。这种Ag/3D GPC纳米复合材料具有相互连接的网络结构，由结晶良好的亚微米级大孔组成，其石墨烯壁薄至几纳米，银纳米颗粒均匀分布在其中。在没有任何表面活性剂的情况下制备了水基和乙二醇基的Ag/3D GPC混合纳米流体。低浓度（<0.8 wt%）的混合纳米流体可以稳定分散超过六个月。与纯水和乙二醇相比，含0.1 wt%的纳米流体在25℃时的热导率增强分别可达10.3%和8.8%。对纳米流体的粘度进行了研究，动态粘度的温度依赖性遵循类似阿仑尼乌斯的行为。所制备的具有良好稳定性和热导率的Ag/3D GPC混合纳米流体有望应用于传热领域。
