Photoacid-Modified Nafion Membrane Morphology Determined by Resonant X-ray Scattering and Spectroscopy,ACS Macro Letters

当前位置： X-MOL 学术 › ACS Macro Lett. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Photoacid-Modified Nafion Membrane Morphology Determined by Resonant X-ray Scattering and Spectroscopy
ACS Macro Letters ( IF 5.1 ) Pub Date : 2019-09-30 , DOI: 10.1021/acsmacrolett.9b00622
Gregory M Su ₁ , William White ₂ , Lawrence A Renna ₂ , Jun Feng ₁ , Shane Ardo _{2,

3,

4} , Cheng Wang ₁

Affiliation

Covalent attachment of photoacid dye molecules to perfluorinated sulfonic acid membranes is a promising route to enable active light-driven ion pumps, but the complex relationship between chemical modification and morphology is not well understood in this class of functional materials. In this study we demonstrate the effect of bound photoacid dyes on phase-segregated membrane morphology. Resonant X-ray scattering near the sulfur K-edge reveals that introduction of photoacid dyes to the end of the ionomer side chains enhances phase segregation among ionomer domains, and the ionomer domain spacing increases with increasing amount of bound dye. Furthermore, relative crystallinity is marginally enhanced within semicrystalline domains composed of the perfluorinated backbone. X-ray absorption spectroscopy coupled with first-principles density functional theory calculations suggest that above a critical concentration, the multiple hydrophilic groups on the attached photoacid dye may help increase residual water content and promote hydration of adjacent sulfonic acid side chains under dry or ambient conditions.

中文翻译：

由共振 X 射线散射和光谱确定的光酸改性 Nafion 膜形态

光酸染料分子与全氟磺酸膜的共价连接是实现活性光驱动离子泵的一种很有前途的途径，但在这类功能材料中化学修饰和形态之间的复杂关系尚不清楚。在这项研究中，我们展示了结合的光酸染料对相分离膜形态的影响。硫 K 边缘附近的共振 X 射线散射表明，在离聚物侧链末端引入光酸染料会增强离聚物域之间的相分离，并且离聚物域间距随着结合染料量的增加而增加。此外，在由全氟化骨架组成的半结晶域内，相对结晶度略有提高。

更新日期：2019-09-30

点击分享查看原文

点击收藏

公开下载

阅读更多本刊新发论文本刊介绍/投稿指南