Simulation and Experimental Study of the Effect of Ultrasonic Dispersion on the Dispersion Stability of Graphene Lubricating Oil
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摘要: 基于LAMMPS分子动力学模拟石墨烯润滑油在超声环境中的分子运动轨迹，通过分子均方根位移方程，计算石墨烯分子扩散系数，从微观角度揭示了超声分散机理。实验通过调节超声分散机功能参数，改变超声时间和超声功率，将所得石墨烯润滑油混合液进行Zeta电位测量，通过Zeta电位表征石墨烯在润滑油中的分散稳定性。结果显示，石墨烯润滑油的分散稳定性与超声时间和超声功率在一定程度上呈正相关曲线，但当超声时间超过105 min，超声功率超过600 W后，分散稳定性有所下降。Abstract: With the large-scale atomic/molecular massively parallel simulator (LAMMPS), the molecular dynamics of molecular motion trajectories of graphene lubricants in the ultrasonic environment is simulated. The diffusion coefficient of graphene molecules is calculated by using the molecular root mean square displacement equation, and the ultrasonic dispersion mechanism is revealed from the microscopic point of view. By adjusting the functional parameters of the ultrasonic disperser and changing its ultrasonic time and frequency, the dispersion stability of the obtained graphene lubricating oil was measured with the zeta potential, and the dispersion stability of graphene in lubricating oil was characterized with the zeta potential. The results show that the dispersion stability of the graphene lubricating oil has a positive correlation curve with ultrasonic time and power to some extent. When the ultrasonic time exceeds 105 min and the ultrasonic power exceeds 600 W, the dispersion stability decreases.
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Key words:
- graphene /
- dynamics /
- ultrasonic dispersion /
- diffusion coefficient /
- dispersion stability
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表 1 改变超声时间和超声功率后得到的30种混合油液
超声分散功率/W 超声分散时间/min 30 45 60 75 90 105 200 A1 A2 A3 A4 A5 A6 300 B1 B2 B3 B4 B5 B6 400 C1 C2 C3 C4 C5 C6 500 D1 D2 D3 D4 D5 D6 600 E1 E2 E3 E4 E5 E6 
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