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HL: Fachverband Halbleiterphysik

HL 50: 2D Materials: Stacking and Heterostructures (joint session O/HL)

HL 50.11: Vortrag

Donnerstag, 20. März 2025, 17:30–17:45, H6

Size-Dependent Diffusion of Radioactive Alcohols Through CNMs — •Neita Khayya, Andre Beyer, and Armin Gölzhäuser — Faculty of Physics, Bielefeld University, 33615 Bielefeld, Germany

Conventional membranes frequently struggle to achieve both, high permeance and high selectivity. On the other hand, two-dimensional membranes demonstrated remarkable progress. For example, nanometer-thin carbon nanomembranes (CNMs) from self-assembled monolayers of terphenylthiol molecules combine rapid water permeation with a rejection of ethanol in pressure-driven experiments as well as ultrahigh ionic exclusion in ion conductivity measurements. Although there has been great progress in understanding the distinctive characteristics of CNMs, more work is required to fully understand their transport characteristics, which requires complementary approaches. In this work, we employed the radio-active tracer diffusion method to study the size-depended concentration-driven permeation of different alcohols, namely [14C] CnH2n+1OH (n = 1*3) through thickness-varied CNMs from biphenylthiol (BPT), terphenylthiol (TPT) as well as quaterphenylthiol (QPT) molecules. Our findings align with vaporous alcohol pressure-driven permeation measurements regarding the size exclusion through CNMs. Interestingly, our results indicate an increased permeation rate in the liquid phase, which can be rationalized by hydrogen bonds created inside the membrane between the water molecules and diffused alcohols.

Keywords: mass transport; two-dimensional membranes; size-depended concentration-driven permeation; diffused alcohols; nanometer-thin carbon nanomembranes