Spreading Characteristics of Molecularly Thin Lubricant on Surfaces With Groove-Shaped Textures: Effects of Molecular Weight and End-Group Functionality
Spreading Characteristics of Molecularly Thin Lubricant on Surfaces With Groove-Shaped Textures: Effects of Molecular Weight and End-Group Functionality
复制标题
细分子润滑剂在凹槽状纹理表面上的铺展特性：分子量和端基官能度的影响
DOI：
10.1115/1.1509771
复制
发表时间：
2003
影响因子：
2.5
通讯作者：
M. Yamada
中科院分区：
文献类型：
--
作者：
Hedong Zhang;Y. Mitsuya;M. Yamada
通过实验和蒙特卡罗模拟研究了分子量和端基官能度对分子薄全氟聚醚（PFPE）薄膜在具有凹槽状纹理的固体表面上铺展的影响。在实验中，利用衍射光在润滑剂覆盖区域减弱的现象来测量润滑剂在具有凹槽状纹理的表面上的铺展。研究发现，凹槽起到加速扩散的作用，并且凹槽越深，这种效果就越大，并且对于具有较大分子量或官能端基的润滑剂，加速速率也变得更大。在模拟中，基于伊辛模型的蒙特卡罗方法得到扩展，使我们能够评估分子量对非功能性润滑剂在凹槽内扩散的影响。模拟与实验结果的一致性很好地证实了新开发的模拟方法的有效性。
Effects of molecular weight and end-group functionality on spreading of molecularly thin perfluoropolyether (PFPE) film over solid surfaces with groove-shaped textures have been studied by experiments and Monte Carlo simulations. In the experiments, lubricant spreading on a surface with groove-shaped textures was measured by making use of the phenomenon in which diffracted light weakens in the lubricant-covered region. It is found that grooves serve to accelerate spreading and this effect increases for deeper grooves, and also the accelerating rate becomes larger for a lubricant having a larger molecular weight or functional end-groups. In the simulations, the Monte Carlo method based on the Ising model was extended to enable us to evaluate the effect of molecular weight on the spreading of non-functional lubricant inside a groove. The validity of the newly developed simulation method was well confirmed from the agreement between the simulation and experimental results.