2021年8月16日 · Electrochemical characterizations of single cells and microelectrodes reveal that high power density is obtained using an ionomer with high oxygen solubility. The high solubility allows oxygen to...

2022年1月31日 · High-temperature fuel cells that operate above 100 °C under anhydrous conditions provide an ideal solution for heat rejection in heavy-duty vehicle applications. Here we report protonated...

2023年11月5日 · The degree of phosphonation was controlled with 19 F NMR by integration of the peak at δ = −135 ppm (equals two fluorine atoms from phosphonated PPFSt) and δ = −165 ppm (equals two fluorine atoms from PPFSt). The phosphonation degree was obtained by calculating the ratio of these peaks and was determined as 66%.

本文我们将利用 科研用小型无液氦核磁共振波谱仪-NMR，带您深入了解 氟核磁共振波谱 （¹⁹F-NMR）。 什么是氟核磁共振 (¹⁹F-NMR)? 与氢 (¹H)核磁共振相似，氟-19 (¹⁹F)核磁共振是化学实验室常用的一种分析技术，只是氟 (¹⁹F)核磁共振是测量氟-19 (¹⁹F)原子的。 研究人员可以通过这项技术来更多的了解含有氟的各种化合物。 我们能从氟核磁共振 (¹⁹F-NMR)中了解到什么? ¹H、¹³C、¹⁹F等的自旋量子数均为1/2，它们的原子核皆为电荷分布均匀的自旋球体。 所以¹⁹F和¹H一 …

Solid samples were grounded with dry KBr powder and pelleted for measurements taken in the wavenumber range of 400–4000 cm−1. 19F nuclear magnetic resonance (NMR) measurements were taken with a Brüker AVANCE 500 NMR Spectrometer (500 MHz).

2024年10月29日 · This study demonstrates a high-throughput fabrication of fiber interlayers for proton exchange membranes based on poly (pentafluorostyrene) (PPFSt) and its aminated derivatives. The fibers are produced by electrospinning, where …

2023年3月5日 · For instance, a possible way to measure water diffusion is nuclear magnetic resonance (NMR) spectroscopy, which has been applied to PEMs several times [28, 29]. Other methods that have been used are X-Ray scattering as well as neutron scattering.

The F/S atomic ratios (measured with wide-scan XPS) of pristine Nafion and the prepared Nafion products (MWCNT-Nafion and Nafion-Br(the sample obtained from the halogen-exchange reaction of ATRP)) to examine the breaks of C-O and C-S linkages of Nafion chains (degradation reaction Nafion) in ATRA/ATRP reactions.

2020年6月8日 · Here we describe a novel 19 F-NMR spectroscopy approach to probe dynamics of large membrane proteins. We labeled a glutamate transporter homolog with a 19 F probe via cysteine chemistry and...

Chemours (formerly DuPont) Nafion PFSA polymer dispersions are made from chemically stabilized perfluorosulfonic acid (PFSA) / polytetrafluoroethylene (PTFE) copolymer in the acid (H+) form, and are available in several polymer content and dispersant compositions.