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Vapor Adsorption Measurements with Two-Dimensional Membranes
Petr Dementyev1, Neita Khayya1, Jakob Kreie1
1Faculty of Physics, Bielefeld University, Universitätsstr. 25, 33615, Bielefeld, Germany.
Summary
This study uses spectroscopy to investigate how vapors interact with two-dimensional (2D) membranes. Condensation on these membranes influences transport, with a water-propanol mixture maintaining its composition on carbon nanomembranes.
Area of Science:
- Materials Science
- Surface Science
- Spectroscopy
Background:
- Two-dimensional (2D) membranes exhibit exceptional mass transfer properties, crucial for gas permeation.
- The thin nature of 2D membranes emphasizes the role of surface interactions in molecular transport.
- Condensation of vapors on membrane surfaces is hypothesized to enhance transport rates.
Purpose of the Study:
- To develop a spectroscopic method for probing adsorbate behavior on 2D membranes under controlled conditions.
- To quantify the adsorption of condensable species on 2D membrane surfaces.
- To investigate the interaction of a water-propanol azeotropic mixture with carbon nanomembranes.
Main Methods:
- Coupling Polarization-Modulation Infrared Reflection Absorption Spectroscopy (PM IRAS) with a reaction chamber and vacuum system.
- Utilizing PM IRAS to monitor adsorption dynamics of vapors on 2D membrane layers.
- Performing quantitative analysis of adsorbate amounts on supported 2D layers.
Main Results:
- Demonstrated a spectroscopic technique capable of providing quantitative adsorption data for 2D membranes.
- Successfully probed the adsorption of condensable species under realistic vapor environments.
- Observed that a water-propanol azeotropic mixture retained its molar composition after interacting with carbon nanomembranes.
Conclusions:
- The developed spectroscopic approach enables quantitative assessment of surface-mediated transport phenomena in 2D membranes.
- Surface adsorption and condensation play a significant role in the transport of vapors across 2D membranes.
- Carbon nanomembranes show stability in maintaining the composition of specific vapor mixtures upon interaction.
Keywords:
azeotropesinfrared reflection absorption spectroscopytwo-dimensional membranesvapor adsorptionvapor permeationMore Related Videos
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