Nanoparticle Diffusion in Crowded Polymer Nanocomposite Melts,ACS Macro Letters

当前位置： X-MOL 学术 › ACS Macro Lett. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Nanoparticle Diffusion in Crowded Polymer Nanocomposite Melts
ACS Macro Letters ( IF 5.1 ) Pub Date : 2024-08-26 , DOI: 10.1021/acsmacrolett.4c00438
Kaitlin Wang ₁ , Karen I Winey _{1,

2}

Affiliation

This study examines nanoparticle diffusion in crowded polymer nanocomposites by diffusing small Al₂O₃ nanoparticles (NPs) in SiO₂-loaded P2VP matrices. Time-of-flight secondary ion mass spectroscopy (ToF-SIMS) measures Al₂O₃ NP diffusion coefficients within a homogeneous PNC background of larger, immobile SiO₂ NPs. By developing a geometric model for the average interparticle distance in a system with two NP sizes, we quantify nanocomposite confinement relative to the Al₂O₃ NP size with a bound layer. At low SiO₂ concentrations, Al₂O₃ NP diffusion aligns with the neat polymer results. In more crowded nanocomposites with higher SiO₂ concentrations where the interparticle distance approaches the size of the mobile Al₂O₃ NP, the 6.5 nm Al₂O₃ NPs diffuse faster than predicted by both core–shell and vehicular diffusion models. Relative to our previous studies of NPs diffusing into polymers, these findings demonstrate that the local environment in crowded systems significantly complicates NP diffusion behavior and the bound layer lifetimes.

中文翻译：

拥挤聚合物纳米复合熔体中的纳米粒子扩散

本研究通过在负载 SiO ₂的 P2VP 基质中扩散小 Al ₂ O ₃纳米颗粒 (NP) 来检查拥挤聚合物纳米复合材料中的纳米颗粒扩散。飞行时间二次离子质谱 (ToF-SIMS) 可测量较大、固定 SiO ₂ NP 的均匀 PNC 背景内的 Al ₂ O ₃ NP 扩散系数。通过开发具有两种 NP 尺寸的系统中平均颗粒间距离的几何模型，我们量化了相对于具有束缚层的 Al ₂ O ₃ NP 尺寸的纳米复合材料限制。在低 SiO ₂浓度下，Al ₂ O ₃ NP 扩散与纯聚合物结果一致。在具有较高 SiO ₂浓度的更拥挤的纳米复合材料中，其中颗粒间距离接近移动 Al ₂ O ₃ NP 的尺寸，6.5 nm Al ₂ O ₃ NP 的扩散速度比核-壳和车辆扩散模型预测的要快。相对于我们之前对纳米粒子扩散到聚合物中的研究，这些发现表明，拥挤系统中的局部环境使纳米粒子扩散行为和结合层寿命显着复杂化。

更新日期：2024-08-26

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南