物理吸附
化学吸附
乙二醇
PEG比率
超分子化学
范德瓦尔斯力
纳米颗粒
化学工程
化学
聚合物
吸附
材料科学
分子
纳米技术
高分子化学
有机化学
财务
工程类
经济
作者
Yao Xue,Huimin Gao,Linxiuzi Yu,Ningning Zhang,Jing Kang,Chunyu Wang,Zhong‐Yuan Lu,Andrew K. Whittaker,Kun Liu
出处
期刊:ACS Nano
[American Chemical Society]
日期:2022-03-30
卷期号:16 (4): 6634-6645
被引量:14
标识
DOI:10.1021/acsnano.2c01051
摘要
Poly(ethylene glycol) (PEG) is the most widely used polymer to decorate inorganic nanoparticles (NPs) by the "grafting-to" method for antifouling properties. PEG also shows diverse supramolecular interactions with nanoparticle surfaces and polar molecules, suggesting that the physisorption between PEG chains and NPs cannot be ignored in the "grafting-to" process. However, the effect of physisorption of PEG to NPs on the process of chemisorption has been rarely studied. Herein, we report that unfunctionalized PEG is physically adsorbed on various NPs by polyvalent supramolecular interactions, adopting "loop-and-train-tail" conformations. We investigated the effect of molecular weight of PEG and ligands of the NPs on the conformation of PEG chains by experimental methods and simulation. It is demonstrated that the physisorption of PEG on NPs can facilitate the chemisorption in the initial stages but delays it in the later stages during the "grafting-to" process. This work provides a deeper understanding of the conformation of physisorbed PEG on NPs and the relationship between physisorption and chemisorption.
科研通智能强力驱动
Strongly Powered by AbleSci AI