Jabbarzadeh A, Harrowell Peter, Tanner R I
School of Aerospace, Mechanical and Mechatronic Engineering, University of Sydney, Sydney, New South Wales 2006, Australia.
Phys Rev Lett. 2006 May 26;96(20):206102. doi: 10.1103/PhysRevLett.96.206102.
We report that the rheological transition in a thin lubrication film of dodecane from bulk to high viscosity states as the thickness is decreased is the result of a novel structural transition. Using nonequilibrium molecular dynamics simulations we find that the initial increase in viscosity as the film thins is due to the formation of isolated crystalline bridges between the surfaces. As the thickness decreases further, these bridges increase in number and organize themselves into a tetratic order in the plane of the surface. We show that this ordered state melts at a temperature of 350 K.
我们报告称，随着厚度减小，十二烷薄润滑膜从本体状态到高粘度状态的流变转变是一种新型结构转变的结果。通过非平衡分子动力学模拟，我们发现随着薄膜变薄，粘度最初的增加是由于表面之间形成了孤立的晶体桥。随着厚度进一步减小，这些桥的数量增加，并在表面平面内组织成四方有序结构。我们表明，这种有序状态在350 K的温度下熔化。
