The thermal properties of graphene oxide (GO) nanoparticles’ colloidal suspensions prepared using the microwave-assisted hydrothermal method were determined. The mode-mismatched dual-beam thermal lens technique was employed to measure the thermal diffusivity of GO nanoparticles for different concentrations in the base fluid. By fitting the experimental data to the theoretical expression, the characteristic time constant was determined. The thermal diffusivity of the fluids seemed to be strongly dependent on the presence of the nanoparticles, increasing from 15.02 ± 0.16 × 10⁻⁴ cm²·s⁻¹ to 27.59 ± 0.51 × 10⁻⁴ cm²·s⁻¹ for concentrations ranging from 0.82 %V to 4.00 %V of GO/H₂O. As nanofluids concentration increased, a higher value of thermal diffusivity was obtained. The optical properties, morphology and chemical structure and functional groups of the nanoparticles were characterized by UV–Vis spectroscopy, transmission electron microscopy (TEM) and Fourier Transform infrared spectroscopy (FTIR). Two main absorption peaks at 230 nm and at 303 nm in the UV–Vis spectra were observed. TEM images revealed a uniform size distribution and spherical in shape NPs with mean diameter of 7.4 nm. This novel type of nanofluids have potential applications for heat transfer fluids like solar collectors and heat exchange systems.

测定了使用微波辅助水热法制备的氧化石墨烯（GO）纳米颗粒胶体悬浮液的热性能。模式不匹配的双光束热透镜技术用于测量基础液中不同浓度的GO纳米粒子的热扩散率。通过将实验数据拟合为理论表达式，可以确定特征时间常数。流体的热扩散率似乎强烈依赖于纳米颗粒的存在，对于浓度范围为15-1的流体，其热扩散率从15.02±0.16×10 ^-4 cm ² ·s ^-1增加到27.59±0.51×10 ^-4 cm ² ·s ^-1 GO / H的0.82％V至4.00％V₂ O.作为纳米流体浓度的增加，得到的热扩散率的更高的值。通过紫外可见光谱，透射电子显微镜（TEM）和傅里叶变换红外光谱（FTIR）对纳米粒子的光学性质，形态，化学结构和官能团进行了表征。在UV-Vis光谱中观察到了两个主要吸收峰，分别位于230 nm和303 nm。TEM图像显示出均匀的尺寸分布和球形NP，平均直径为7.4 nm。这种新型的纳米流体对于诸如太阳能收集器和热交换系统的传热流体具有潜在的应用。