pH-Regulated Single and Double Charge Inversions on PEI-Coated Surfaces,ACS Macro Letters

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pH-Regulated Single and Double Charge Inversions on PEI-Coated Surfaces
ACS Macro Letters ( IF 5.1 ) Pub Date : 2022-05-26 , DOI: 10.1021/acsmacrolett.2c00227
Chao Feng ₁ , Yun-Jian Zhang ₁ , Chun-Lai Ren _{2,

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Affiliation

The pH-regulated charge inversions on polyethylenimine (PEI)-coated surfaces are indispensable to their applications in biomaterials and nanomaterials. Various PEI-coated surfaces, where single charge inversion happens, have been extensively investigated, while the surfaces where double charge inversion appears are less reported. Here, using a molecular theory, we systematically study the pH-regulated charge density of PEI-coated surfaces. The results suggest whether single or double charge inversion happens depends on PEI affinity to the surface and the bare surface charge density. The region of double charge inversion is much smaller than that of single charge inversion, revealing the reason why double charge inversion is less observed in experiments. Besides, the charge inversions are significantly influenced by the solution condition. The present work provides a useful guideline to the selection of the coated materials and the parameters of PEI solution in the design of PEI-coated surfaces aiming to promote their applications in multifunctional nanomaterials.

中文翻译：

PEI 涂层表面上的 pH 调节单电荷和双电荷反转

聚乙烯亚胺 (PEI) 涂层表面上的 pH 调节电荷反转对于它们在生物材料和纳米材料中的应用是必不可少的。已经广泛研究了发生单电荷反转的各种 PEI 涂层表面，而出现双电荷反转的表面报道较少。在这里，我们使用分子理论系统地研究了 PEI 涂层表面的 pH 调节电荷密度。结果表明是否发生单电荷反转或双电荷反转取决于PEI对表面的亲和力和裸表面电荷密度。双电荷反转的区域远小于单电荷反转的区域，揭示了实验中很少观察到双电荷反转的原因。此外，电荷反转受溶液条件的影响很大。

更新日期：2022-05-26

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