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Composite generalized Langevin equation for Brownian motion in different hydrodynamic and adhesion regimes

机译:不同流体动力学和黏附状态下布朗运动的复合广义Langevin方程

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摘要

We present a composite generalized Langevin equation as a unified framework for bridging the hydrodynamic, Brownian, and adhesive spring forces associated with a nanoparticle at different positions from a wall, namely, a bulklike regime, a near-wall regime, and a lubrication regime. The particle velocity autocorrelation function dictates the dynamical interplay between the aforementioned forces, and our proposed methodology successfully captures the well-known hydrodynamic long-time tail with context-dependent scaling exponents and oscillatory behavior due to the binding interaction. Employing the reactive flux formalism, we analyze the effect of hydrodynamic variables on the particle trajectory and characterize the transient kinetics of a particle crossing a predefined milestone. The results suggest that both wall-hydrodynamic interactions and adhesion strength impact the particle kinetics.
机译:我们提出了一个综合的广义Langevin方程,作为桥接与纳米颗粒在距壁不同位置的流体动力,布朗力和粘性弹簧力的统一框架,即体相状态,近壁状态和润滑状态。质点速度的自相关函数决定了上述力之间的动力学相互作用,我们提出的方法成功地捕获了众所周知的流体动力学长时间拖尾,具有依赖于上下文的缩放指数和由于绑定相互作用而产生的振荡行为。利用反应性通量形式,我们分析了流体动力学变量对粒子轨迹的影响,并表征了跨越预定里程碑的粒子的瞬态动力学。结果表明,壁-流体动力学相互作用和粘附强度都影响颗粒动力学。

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