<br>扩散带电聚合物两性离子作为松散水合海洋防污涂料,Langmuir

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扩散带电聚合物两性离子作为松散水合海洋防污涂料
Langmuir ( IF 3.7 ) Pub Date : 2023-12-22 , DOI: 10.1021/acs.langmuir.3c02492
Shawn D Mengel ₁ , Wen Guo ₂ , Guangyao Wu ₂ , John A Finlay ₃ , Peter Allen ₃ , Anthony S Clare ₃ , Riddhiman Medhi ₄ , Zhan Chen ₂ , Christopher K Ober ₄ , Rachel A Segalman _{1,

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Affiliation

聚合物两性离子通过形成固定水分子的强水合表面而表现出优异的防污性。虽然在生物医学、膜以及海洋环境中对其性能进行了广泛测试，但很少有研究调查两性离子的分子设计如何增强其性能。此外，虽然分子尺度污染物种类（例如蛋白质和小分子）存在两性离子防污机制理论，但仍不清楚分子尺度机制如何影响与海洋应用相关的微观和宏观相互作用。本研究通过使用模块化两性离子化学平台来解决这些差距，该平台的特点是结合了表面敏感和频发生（SFG）振动光谱和海洋分析。具有越来越多的离域阳离子的两性离子表现出对绿藻石莼的更好的抗污性。 SFG 光谱与测定结果密切相关，表明电荷越分散，表面水合作用越多，结合的水分子越多。因此，界面结合水分子的数量似乎比界面处单个水分子的结合强度更能影响两性离子聚合物的海洋防污活性。

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Diffusely Charged Polymeric Zwitterions as Loosely Hydrated Marine Antifouling Coatings

Polymeric zwitterions exhibit exceptional fouling resistance through the formation of a strongly hydrated surface of immobilized water molecules. While being extensively tested for their performance in biomedical, membrane, and, to a lesser extent, marine environments, few studies have investigated how the molecular design of the zwitterion may enhance its performance. Furthermore, while theories of zwitterion antifouling mechanisms exist for molecular-scale foulant species (e.g., proteins and small molecules), it remains unclear how molecular-scale mechanisms influence the micro- and macroscopic interactions of relevance for marine applications. The present study addresses these gaps through the use of a modular zwitterion chemistry platform, which is characterized by a combination of surface-sensitive sum frequency generation (SFG) vibrational spectroscopy and marine assays. Zwitterions with increasingly delocalized cations demonstrate improved fouling resistance against the green alga Ulva linza. SFG spectra correlate well with the assay results, suggesting that the more diffuse charges exhibit greater surface hydration with more bound water molecules. Hence, the number of bound interfacial water molecules appears to be more influential in determining the marine antifouling activities of zwitterionic polymers than the binding strength of individual water molecules at the interface.

更新日期：2023-12-22

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