Abe Yusaku, Tomioka Naoki, Matsuda Yu
Department of Modern Mechanical Engineering, Waseda University 3-4-1 Ookubo Shinhuku-ku Tokyo Japan
Nanoscale Adv. 2025 Jan 8;7(3):728-734. doi: 10.1039/d4na00873a. eCollection 2025 Jan 28.
The diffusion motions of individual polymer aggregates in disordered porous media were visualized using the single-particle tracking (SPT) method because the motions inside porous media play important roles in various fields of science and engineering. In the aggregates diffused on the surfaces of pores, continuous adsorption and desorption processes were observed. The relationship between the size of the aggregates and pore size was analysed based on diffusion coefficients, moment scaling spectrum (MSS) slope analysis, and diffusion anisotropy analysis. The obtained diffusion coefficients were different for different aggregates and pore sizes. The MSS slope analysis indicated that more than 85% of the aggregates showed confined diffusion for all the conditions investigated. The diffusion anisotropy analysis suggested that the diffusion of the aggregates exhibited anisotropic behaviour. The interactions between the aggregates and the pores were complex, causing the aggregates to exhibit motions distinct from those associated with surface diffusion on smooth surfaces.
由于无序多孔介质中的运动在科学和工程的各个领域都起着重要作用，因此使用单粒子追踪（SPT）方法对单个聚合物聚集体在无序多孔介质中的扩散运动进行了可视化。在孔隙表面扩散的聚集体中，观察到了连续的吸附和解吸过程。基于扩散系数、矩缩放谱（MSS）斜率分析和扩散各向异性分析，分析了聚集体尺寸与孔径之间的关系。对于不同的聚集体和孔径，获得的扩散系数是不同的。MSS斜率分析表明，在所研究的所有条件下，超过85%的聚集体表现出受限扩散。扩散各向异性分析表明，聚集体的扩散表现出各向异性行为。聚集体与孔隙之间的相互作用很复杂，导致聚集体表现出与光滑表面上的表面扩散相关的运动不同的运动。
