arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1003.3437cond-mat.softcond-mat.stat-mech
收藏

具有毛细管相互作用的胶体颗粒动力学

Dynamics of colloidal particles with capillary interactions

Alvaro Dominguez, Martin Oettel, S. Dietrich

摘要:

我们研究了由吸引力毛细管相互作用驱动的流体界面处的胶体动力学。在亚毫米长度尺度上,毛细引力形式上类似于二维重力。特别是,它是一种不可积的相互作用,尽管它在对势水平上很弱,但它实际上与集体现象相关。我们引入一个平均场模型的粒子数密度在界面处的动态演化。对于通用值的物理参数的均匀分布被发现是不稳定的大规模集群驱动的毛细吸引力。我们还表明,不稳定性是可观察到的,适当的值的相关参数(胶体半径,表面电荷,外部电场,等)。在实验上很容易获得。我们的分析有助于目前的研究的结构和动力学系统的远程相互作用和指向他们的实验实现通过胶体悬浮液。

英文摘要:

We investigate the dynamics of colloids at a fluid interface driven by attractive capillary interactions. At submillimeter length scales, the capillary attraction is formally analogous to two-dimensional gravity. In particular it is a non-integrable interaction and it can be actually relevant for collective phenomena in spite of its weakness at the level of the pair potential. We introduce a mean-field model for the dynamical evolution of the particle number density at the interface. For generic values of the physical parameters the homogeneous distribution is found to be unstable against large-scale clustering driven by the capillary attraction. We also show that for the instability to be observable, the appropriate values for the relevant parameters (colloid radius, surface charge, external electric field, etc.) are experimentally well accessible. Our analysis contributes to current studies of the structure and dynamics of systems governed by long-ranged interactions and points towards their experimental realizations via colloidal suspensions.

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。

↑