论文标题
通过微泡振荡结构胶体凝胶
Structuring Colloidal Gels via Micro-Bubble Oscillations
论文作者
论文摘要
在本地（重新）结构胶体凝胶$ \ unicode {x2013} $微米大小的粒子，形成具有被捕的动力学的连接网络$ \ unicode {x2013} $启用系统的微机械和-Rheologology属性的精确调整。最近的一项实验研究[B. Saint-Michel，G。Petekidis和V. Garbin，软物质$ \ boldsymbol {18} $，2092（2022）]表明，可以通过声学调节嵌入的微泡，可以通过声学调节来进行快速重组。在这里，我们执行布朗动力学模拟，以了解振荡微泡对嵌入胶体凝胶结构的机械效应。我们的模拟显示在与振荡幅度相当的范围内进行了六边形连接的重组。但是，我们无法重现凝胶结构$ \ unicode {x2013} $数十个振幅$ \ unicode {x2013} $的意外长期修改。这表明在将来的工作中应考虑包括长期效应，例如流体流。
Locally (re)structuring colloidal gels $\unicode{x2013}$ micron-sized particles forming a connected network with arrested dynamics $\unicode{x2013}$ enables precise tuning of the micromechanical and -rheological properties of the system. A recent experimental study [B. Saint-Michel, G. Petekidis, and V. Garbin, Soft Matter $\boldsymbol{18}$, 2092 (2022)] showed that rapid restructuring can occur by acoustically modulating an embedded microbubble. Here, we perform Brownian dynamics simulations to understand the mechanical effect of an oscillating microbubble on the structure of the embedding colloidal gel. Our simulations reveal a hexagonal-close-packed restructuring in a range that is comparable to the amplitude of the oscillations. However, we were unable to reproduce the unexpectedly long-ranged modification of the gel structure $\unicode{x2013}$ dozens of amplitudes $\unicode{x2013}$ observed in experiment. This suggests including long-ranged effects, such as fluid flow, should be considered in future work.
