拥挤与捕获竞争以增强界面扩散
Crowding competes with trapping to enhance interfacial diffusion
摘要：
在生物膜或材料界面的拥挤环境中的扩散通常涉及与表面蛋白质或缺陷的间歇性结合。为了解释这种情况，我们研究了一个2维格子气在一个领域的固定陷阱。利用动力学蒙特卡罗模拟，我们计算了在长时间限制的有效扩散系数作为陷阱和粒子密度的函数。我们发现一个显着的结果-增加的扩散系数与颗粒密度，我们硬币作为拥挤增强扩散的效果。我们合理化这一结果使用缩放参数和主方程的方法。
英文摘要：
Diffusion in the crowded environments of the biological membranes or materials interfaces often involves intermittent binding to surface proteins or defects. To account for this situation we study a 2-dimensional lattice gas in a field of immobilized traps. Using kinetic Monte Carlo simulations, we calculate the effective diffusion coefficient in the long-time limit as a function of the traps and particle densities. We find a remarkable result - an increase of the diffusion coefficient with particle density, an effect that we coin as crowding-enhanced diffusion. We rationalize this result using scaling arguments and the master equation approach.
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