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。
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.
作者
张丽秀
李文旭
魏晓奕
吴玉厚
Zhang Lixiu;Li Wenxu;Wei Xiaoyi;Wu Yuhou(Test and Analysis Center,Shenyang Jianzhu University,Shenyang 110168,China;School of Mechanical Engineering,Shenyang Jianzhu University,Shenyang 110168,China)
出处
《机械科学与技术》
CSCD
北大核心
2020年第7期1014-1021,共8页
Mechanical Science and Technology for Aerospace Engineering
基金
辽宁省教育厅重点项目(LJZ2017005)资助。
关键词
石墨烯
超声分散
ZETA电位
扩散系数
分散稳定性
graphene
dynamics
ultrasonic dispersion
diffusion coefficient
dispersion stability
