Cyclic Polyethylene Glycol as Nanoparticle Surface Ligand,ACS Macro Letters

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Cyclic Polyethylene Glycol as Nanoparticle Surface Ligand
ACS Macro Letters ( IF 5.1 ) Pub Date : 2020-10-23 , DOI: 10.1021/acsmacrolett.0c00730
M Ali Aboudzadeh _{1,

2} , Amaia Iturrospe ₁ , Arantxa Arbe ₁ , Marek Grzelczak _{1,

2} , Fabienne Barroso-Bujans _{1,

2,

3,

4}

Affiliation

Cyclic polymers behave different than linear polymers due to the lack of end groups and smaller coil dimensions. Herein, we demonstrate that cyclic polyethylene glycol (PEG) can be used as an alternative of classical linear PEG ligands for gold nanoparticle (AuNP) stabilization. We observed that the brush height of cyclic PEG on AuNPs of diameter 4.4 and 13.2 nm increases identically as that of linear brushes with (Nσ^1/2)^0.7 (N, number of monomers in a chain and σ, grafting density) and that cyclic brushes are more stretched than their linear analogues when compared to their unperturbed dimensions. Such structural effect and the reduced footprint diameter in cyclic brushes with the entire chain in a concentrated polymer brush regime explains the distinct response of NPs to ionic strength and temperature, respectively, compared to linear analogues. These experiments are an important step in understanding the effect of polymer brush topology on colloidal properties.

中文翻译：

环状聚乙二醇作为纳米颗粒表面配体

由于缺乏端基和较小的线圈尺寸，环状聚合物的行为不同于线性聚合物。在这里，我们证明了环状聚乙二醇 (PEG) 可以用作经典线性 PEG 配体的替代品，用于金纳米颗粒 (AuNP) 稳定化。我们观察到，在直径为 4.4 和 13.2 nm 的 AuNPs 上，环状 PEG 的刷子高度与 ( N σ ^1/2 ) ^0.7 ( N，链中的单体数量和 σ，接枝密度），并且与它们的未受干扰的尺寸相比，循环刷比它们的线性类似物更拉伸。与线性类似物相比，这种结构效应和整个链在浓缩聚合物刷方案中的循环刷中减少的足迹直径分别解释了 NPs 对离子强度和温度的不同响应。这些实验是了解聚合物刷拓扑结构对胶体性质影响的重要一步。

更新日期：2020-11-17

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