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arXiv 1607.08167cond-mat.soft
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接触线钉扎对非球形胶体在液界面吸附的影响

Effects of contact-line pinning on the adsorption of nonspherical colloids at liquid interfaces

Anna Wang, W. Benjamin Rogers, Vinothan N. Manoharan

摘要:

接触线钉扎效应在宏观系统中是众所周知的,但在胶体悬浮液中的微观尺度上才刚刚开始探索。我们使用数字全息捕捉快速三维动态的微米大小的椭球突破油水界面。我们发现,粒子的角度随高度近似线性变化,在从模拟的基础上最小化的界面能的结果。使用一个简单的模型的接触线的运动,我们表明,所观察到的平移和旋转自由度之间的耦合可能是由于接触线钉扎。我们的结论是,胶体颗粒吸附到液体界面的动力学不确定由最小化的界面能和粘性耗散单独的接触线钉扎决定的时间尺度和途径的平衡。

英文摘要:

The effects of contact-line pinning are well-known in macroscopic systems, but are only just beginning to be explored at the microscale in colloidal suspensions. We use digital holography to capture the fast three-dimensional dynamics of micrometer-sized ellipsoids breaching an oil-water interface. We find that the particle angle varies approximately linearly with the height, in contrast to results from simulations based on minimization of the interfacial energy. Using a simple model of the motion of the contact line, we show that the observed coupling between translational and rotational degrees of freedom is likely due to contact-line pinning. We conclude that the dynamics of colloidal particles adsorbing to a liquid interface are not determined by minimization of interfacial energy and viscous dissipation alone; contact-line pinning dictates both the timescale and pathway to equilibrium.

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。

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