April 22 - 26, 2024
Seattle, Washington
May 7 - 9, 2024 (Virtual)
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2024 MRS Spring Meeting & Exhibit
NM03.05.05

Anti-Arrhenius Passage of Gaseous Molecules through Nanoporous Two-Dimensional Membranes

When and Where

Apr 25, 2024
3:30pm - 4:00pm
Room 329, Level 3, Summit

Presenter(s)

Co-Author(s)

Armin Goelzhaeuser1,Petr Dementyev1

Bielefeld University1

Abstract

Armin Goelzhaeuser1,Petr Dementyev1

Bielefeld University1
The passage of molecules through membranes is known to follow an Arrhenius-like kinetics, i.e. the flux is accelerated upon heating and vice versa. There exist though stepwise processes whose rates can decrease with temperature if, for example, adsorbed intermediates are involved. In this study, we perform temperature-variable permeation experiments in the range from -50 to +50 °C and observe anti-Arrhenius behaviour of water and ammonia permeating in two-dimensional freestanding carbon nanomembranes (CNMs). The permeation rate of water vapour is found to drop manyfold with warming, while the passage of ammonia molecules strongly increases when the membrane is cooled down to the dew point. Liquefaction of isobutylene shows no enhancement for its transmembrane flux which is consistent with the material’s pore architecture.

Keywords

gas chromatography | thermogravimetric analysis (TGA)

Symposium Organizers

Michael Boutilier, Western University
Ngoc Bui, The University of Oklahoma
Piran Ravichandran Kidambi, Vanderbilt University
Sui Zhang, National University of Singapore

Session Chairs

Piran Ravichandran Kidambi
Luda Wang

In this Session