基于全内反射显微镜 (TIRM) 的直接表征水溶液中聚合物刷构象变化的方法。

IF 5.1 Q1 POLYMER SCIENCE ACS Macro Letters Pub Date : 2024-10-15 Epub Date: 2024-10-04 DOI:10.1021/acsmacrolett.4c00476
Jiahao Wu, Feng Cao, Pui Wo Felix Yeung, Manjia Li, Kohji Ohno, To Ngai
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引用次数: 0

摘要

本研究提出了一种利用全内反射显微镜(TIRM)有效描述聚合物刷在水溶液中溶胀和塌陷特性的新方法。研究选择了聚羧基甜菜碱甲基丙烯酸酯(PCBMA)和非离子聚[寡(乙二醇)甲基醚甲基丙烯酸酯](POEGMA)刷作为模型系统。通过研究在测量近壁受阻扩散过程中观察到的一个有趣的理论-实验差异,获得了关于聚合物刷的可压缩性的宝贵见解,揭示了它们在水溶液中的构象信息。结果表明,在 0.1-10 mM NaCl 溶液中,齐聚物 PCBMA 刷的抗聚电解质效应极小,但随着 pH 值的升高,会出现明显的膨胀。另一方面,非离子 POEGMA 电刷对离子强度的反应与弱聚电解质电刷相似。这些意想不到的发现增强了我们对聚合物刷的理解,超越了经典理论。事实证明,基于 TIRM 的方法可有效表征聚合物刷和其他软纳米材料。
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A Total Internal Reflection Microscopy (TIRM)-Based Approach for Direct Characterization of Polymer Brush Conformational Change in Aqueous Solution.

This study presents a novel approach utilizing total internal reflection microscopy (TIRM) to effectively characterize the swelling and collapse of polymer brushes in aqueous solutions. Zwitterionic poly(carboxybetaine methacrylate) (PCBMA) and nonionic poly[oligo(ethylene glycol) methyl ether methacrylate] (POEGMA) brushes are chosen as model systems. By investigation of an intriguing theory-experiment discrepancy observed during the measurement of near-wall hindered diffusion, valuable insights into the compressibility of polymer brushes are obtained, revealing their conformational information in aqueous solution. The results demonstrate that zwitterionic PCBMA brushes exhibit minimal antipolyelectrolyte effects in 0.1-10 mM NaCl solution but undergo significant swelling with increasing pH. On the other hand, nonionic POEGMA brushes exhibit similar responses to ionic strength as weak polyelectrolyte brushes. These unexpected findings enhance our understanding of polymer brushes beyond classical theories. The TIRM-based approach proves to be effective for characterizing polymer brushes and other soft nanomaterials.

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来源期刊
CiteScore
10.40
自引率
3.40%
发文量
209
审稿时长
1 months
期刊介绍: ACS Macro Letters publishes research in all areas of contemporary soft matter science in which macromolecules play a key role, including nanotechnology, self-assembly, supramolecular chemistry, biomaterials, energy generation and storage, and renewable/sustainable materials. Submissions to ACS Macro Letters should justify clearly the rapid disclosure of the key elements of the study. The scope of the journal includes high-impact research of broad interest in all areas of polymer science and engineering, including cross-disciplinary research that interfaces with polymer science. With the launch of ACS Macro Letters, all Communications that were formerly published in Macromolecules and Biomacromolecules will be published as Letters in ACS Macro Letters.
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