Abe Yusaku, Tomioka Naoki, Matsuda Yu
Department of Modern Mechanical Engineering, Waseda University 3-4-1 Ookubo, Shinjuku-ku Tokyo 169-8555 Japan
Nanoscale Adv. 2024 Feb 6;6(7):1874-1879. doi: 10.1039/d3na01028g. eCollection 2024 Mar 26.
Porous materials are used in a variety of industrial applications owing to their large surface areas, large pore volumes, hierarchical porosities, and low densities. The motion of particles inside the pores of porous materials has attracted considerable attention. We investigated nano-particle motion in a porous material using the single-particle tracking method. Particle motion such as absorption and desorption at the wall was observed. The displacement probability distribution deviated from the Gaussian distribution at the tail, indicating non-Gaussian motion of the particles. Moreover, an analysis of the relative angle between three consecutive particle positions revealed that the probability of the particle moving backward was approximately twice that of the particle moving forward. These results indicate that particle motion inside porous materials is highly complex and that a single-particle study is essential for fabricating a structure that is suitable for applications.
多孔材料因其具有大表面积、大孔体积、分级孔隙率和低密度等特点，而被应用于各种工业领域。多孔材料孔隙内颗粒的运动已引起了广泛关注。我们采用单粒子追踪方法研究了多孔材料中纳米粒子的运动。观察到了颗粒在壁面处的吸附和解吸等运动。位移概率分布在尾部偏离高斯分布，表明颗粒的运动是非高斯运动。此外，对三个连续粒子位置之间的相对角度分析表明，粒子向后移动的概率约为向前移动概率的两倍。这些结果表明，多孔材料内部的颗粒运动非常复杂，并且单粒子研究对于制造适用于实际应用的结构至关重要。
