Molecular simulation of hopping mechanisms of nanoparticles in regular cross-linked polymer networks
Molecular simulation of hopping mechanisms of nanoparticles in regular cross-linked polymer networks
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DOI：
10.1063/5.0098947
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Bin Li
中科院分区：
文献类型：
--
作者：
Bo-Ran Zhao;Bin Li
We use coarse-grained simulations to explore the diffusion mechanism of nanoparticles with different sizes at various nanoparticle–polymer interactions in regular cross-linked polymer networks. The long time diffusivities of nanoparticles show a non-monotonic tendency at various nanoparticle–polymer interactions due to the intermittent hopping of nanoparticles through network cells. The preferred locations of small nanoparticles switch from the cell centers to the corners of cells as they interact with the network more strongly, which results in the hopping energy barrier between different cells switching from cell center localization to adsorption on networks. Steric hindrance seriously hampers large nanoparticles from hopping to neighboring network cells, and the interactions between the nanoparticle and network enhance the network deformability and also affect the hopping of nanoparticles. The multiple constraint mechanisms result in the non-monotonic diffusivities of nanoparticles with different interactions and non-Brownian motions at different time scales. Our work illustrates the hopping mechanisms of nanoparticles in polymer networks from thermodynamic and dynamic points of view.
