Dresden 2020 – wissenschaftliches Programm

Die DPG-Frühjahrstagung in Dresden musste abgesagt werden! Lesen Sie mehr ...

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

O: Fachverband Oberflächenphysik

O 74: Nanostructured Surfaces and Thin Films I: Synthesis and Properties (joint session O/CPP)

O 74.4: Vortrag

Mittwoch, 18. März 2020, 15:45–16:00, WIL B321

Determination of Carbon Nanomembrane Diffusion Coefficients via radioactive tracer experiments — Raphael Dalpke¹, Anna Dreyer², •Riko Korzetz¹, André Beyer¹, Karl-Josef Dietz², and Armin Gölzhäuser¹ — ¹Faculty of Physics, Bielefeld University — ²Faculty of Biology, Bielefeld University

In recent years, 2D materials have gained a lot of attention as highly efficient filter materials. One class of materials are carbon nanomembranes (CNM), which are fabricated by self-assembly of organic precursors onto metal substrates and subsequent cross-linking by electron irradiation. They can be released from their original substrate and transferred onto arbitrary supports. Specifically, CNMs made from terphenylthiol (TPT) exhibit a very high selectivity towards water in combination with an outstanding permeance [1].

Here, we present new permeation measurements of TPT-CNMs utilizing radioactively marked water as well as carbonate and phosphate ions. We show that water and carbonate can pass through while phosphate ions are completely blocked by the CNM. The resulting diffusion coefficients in combination with recent findings indicate that the permeation across the membrane primarily occurs by transport of neutral species. This implies a fast transport of CO2 in aqueous solution, while dry TPT-CNMs are not permeable to CO2, which suggests a facilitated transport in the presence of water.

[1] Yang et.al., ACS Nano 2018 12(5), 4695-4701