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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 14: 2D Materials
CPP 14.2: Vortrag
Montag, 18. März 2024, 16:30–16:45, H 0111
Radioactive Tracer Diffusion through TPT-CNMs — •Neita Khayya, André Beyer, and Armin Gölzhäuser — Faculty of Physics, Bielefeld University, 33615 Bielefeld, Germany
In recent years, Carbon Nanomembranes (CNMs) have emerged as an innovative class of thin 2D materials known for their exceptional combination of high selectivity and permeation properties, with a particular emphasis on p-[1,1’,4’,1”]-terphenyl-4-thiol (TPT)-CNM. Despite significant progress in comprehending the characteristic features of CNMs, there remains a need for further clarification of their fundamental properties, which can be addressed through complementary methods. Here, we report the permeation measurements derived from concentration-gradient-driven transport of radioactive tracer molecules, specifically [3H] H2O, [14C] NaHCO3, and [32P] H3PO4, through TPT-CNMs. Our investigation explores into the impact of the pH value on the diffusion process. Considering concentration polarization and outgassing effects by a mathematical model, our results align with previously obtained radioactive diffusion data for a neutral pH value of 7. Interestingly, despite the electrostatic barrier associated with TPT-CNM, our observations indicate enhanced permeation of anions in the basic range of pH. This emphasizes the nuanced behavior of TPT-CNMs under varying pH conditions, shedding light on their unique permeation characteristics.
Keywords: Carbon Nanomembranes (CNMs); 2D materials; Permeation; pH; Radioactive tracer