arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2103.15043cond-mat.softphysics.bio-phq-bio.TO
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颗粒间粘附调节生长致密的三维活性颗粒聚集体的表面粗糙度

Inter-particle adhesion regulates the surface roughness of growing dense three-dimensional active particle aggregates

Sumit Sinha, Abdul N Malmi-Kakkada

摘要:

活动和自生运动是在许多生命和非生命系统中观察到的基本特征。鉴于颗粒间的粘附力是已知的,以调节颗粒动力学,我们研究如何粘附强度控制的边界生长和粗糙度在一个活跃的颗粒聚集。使用基于粒子的模拟,结合活动(出生,死亡和生长)和系统的物理相互作用(弹性和粘附),我们建立了粒子间粘附强度($f^{ad}$)控制的表面粗糙度的密集堆积的三维(3D)活性粒子聚集体扩展到一个高粘度的介质。我们发现,3D活性颗粒聚集体的表面粗糙度与颗粒间粘附强度$f^{ad}$成比例地增加。我们发现,在径向和切向的活性颗粒均方位移(MSD)的不对称性抑制3D表面粗糙度在较低的粘附强度。通过分析颗粒位移的统计特性在聚集体外围,我们确定的3D表面粗糙度是由活性颗粒的运动向核心在高颗粒间的粘附强度。我们的研究结果阐明了物理控制粘性3D活性颗粒集体膨胀成一个高粘性介质,与理解随机界面生长的影响活性物质系统,其特征在于自生粒子通量。

英文摘要:

Activity and self-generated motion are fundamental features observed in many living and non-living systems. Given that inter-particle adhesive forces are known to regulate particle dynamics, we investigate how adhesion strength controls the boundary growth and roughness in an active particle aggregate. Using particle based simulations incorporating both activity (birth, death and growth) and systematic physical interactions (elasticity and adhesion), we establish that inter-particle adhesion strength ($f^{ad}$) controls the surface roughness of a densely packed three-dimensional(3D) active particle aggregate expanding into a highly viscous medium. We discover that the surface roughness of a 3D active particle aggregate increases in proportion to the inter-particle adhesion strength, $f^{ad}$. We show that asymmetry in the radial and tangential active particle mean squared displacement (MSD) suppresses 3D surface roughness at lower adhesion strengths. By analyzing the statistical properties of particle displacements at the aggregate periphery, we determine that the 3D surface roughness is driven by the movement of active particle towards the core at high inter-particle adhesion strengths. Our results elucidate the physics controlling the expansion of adhesive 3D active particle collectives into a highly viscous medium, with implications into understanding stochastic interface growth in active matter systems characterized by self generated particle flux.

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