The deposition process at the edge of evaporating colloidal drops varies with the shape of suspended particles. Experiments with prolate ellipsoidal particles suggest that the spatiotemporal properties of the deposit depend strongly on particle aspect ratio. As the aspect ratio increases, the particles form less densely-packed deposits and the statistical behavior of the deposit interface crosses over from the Kardar–Parisi–Zhang (KPZ) universality class to another universality class which was suggested to be consistent with the KPZ plus quenched disorder. Here, we numerically study the effect of particle interaction anisotropy on deposit growth. In essence, we model the ellipsoids, at the interface, as disk-like particles with two types of interaction patches that correspond to specific features at the poles and equator of the ellipsoid. The numerical results corroborate experimental observations and further suggest that the deposition transition can stem from interparticle interaction anisotropy. Possible extensions of our model to other systems are also discussed.

中文翻译：

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干燥液滴边缘的颗粒沉积中的相互作用各向异性和KPZ到KPZQ跃迁

蒸发胶体液滴边缘的沉积过程随悬浮颗粒的形状而变化。椭圆形长颗粒的实验表明，沉积物的时空特性强烈取决于颗粒的长宽比。随着长宽比的增加，颗粒形成的堆积密度降低，并且沉积物界面的统计行为从Kardar–Parisi–Zhang（KPZ）通用性类别过渡到另一个通用性类别，这被认为与KPZ plus一致猝死症。在这里，我们数值研究颗粒相互作用各向异性对沉积物生长的影响。从本质上讲，我们在界面处将椭球建模为具有两种类型的交互补丁的圆盘状粒子，这些交互补丁对应于椭球的极点和赤道处的特定特征。数值结果证实了实验观察结果，并进一步表明沉积转变可能源于粒子间相互作用的各向异性。还讨论了将模型扩展到其他系统的可能性。