Regensburg 2022 – scientific programme

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O: Fachverband Oberflächenphysik

O 20: Poster Monday: Solid-Liquid Interfaces

O 20.1: Poster

Monday, September 5, 2022, 18:00–20:00, P4

Vapor adsorption on carbon nanomembranes (CNMs) — •En-Neita Khayya, Petr Dementyev, and Armin Gölzhäuser — Faculty of Physics, Bielefeld University, 33615 Bielefeld, Germany

Intrinsically porous carbon nanomembranes (CNMs) demonstrate promising mass transfer properties with respect to separation of liquids and gases. To complement the permeation studies with CNMs, we introduce a spectroscopic experiment for probing adsorption of vaporous substances on their surface under ambient conditions. Polarization-modulation infrared reflection absorption spectroscopy (PM IRAS) is used to quantify the number of adsorbed species with the help of innovative calibration approaches, including azeotropic mixtures and immobilization in a polymer matrix. Water and alcohols are found to readily condense on supported CNMs yielding liquid-like interfaces. The results are consistent with the vapor permeation rates measured in free-standing CNMs.