arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0912.2179cond-mat.soft
收藏

纳米受限简单流体的非线性流变学

Non-linear rheology of a nanoconfined simple fluid

Lionel Bureau

摘要:

我们探测的流变学模型液体八甲基环四硅氧烷(OMCTS)限制到分子薄膜,使用一个独特的表面力装置允许探索大范围的剪切速率和限制。因此,我们表明,OMCTS下增加约束表现出的粘度增强和非线性流动特性的剪切过冷液体接近其玻璃化转变。此外,我们还研究了封闭OMCTS通过“挤出”前沿的传播排水。由Becker和Mugele提出的流体动力学模型[Phys. Rev. Lett. { \bf 91},166104(2003)]来描述这样的前沿动力学导致与流变学测量所证明的动力学减速明显矛盾的结论,这表明前沿传播不受限制膜中的大规模流动控制。

英文摘要:

We probe the rheology of the model liquid octamethylcyclotetrasiloxane (OMCTS) confined into molecularly thin films, using a unique Surface Forces Apparatus allowing to explore a large range of shear rates and confinement. We thus show that OMCTS under increasing confinement exhibits the viscosity enhancement and the non-linear flow properties characteristic of a sheared supercooled liquid approaching its glass transition. Besides, we study the drainage of confined OMCTS via the propagation of "squeeze-out" fronts. The hydrodynamic model proposed by Becker and Mugele [Phys. Rev. Lett. {\bf 91}, 166104 (2003)] to describe such front dynamics leads to a conclusion in apparent contradiction with the dynamical slowdown evidenced by rheology measurements, which suggests that front propagation is not controlled by large scale flow in the confined films.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑