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Issue 28, 2019
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Vapour permeation measurements with free-standing nanomembranes

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Abstract

Mass transfer across porous materials with nanoscale thickness is of great interest in terms of both fundamentals of fluid dynamics and practical challenges of membrane separation. In particular, few-atom thick sieves are viewed as attractive candidates to achieve ultimate permeability without compromising membrane selectivity. In this work, we introduce a vacuum system for studying vapour and gas permeation in micrometre-sized samples of suspended nanometre-thick films. Steady-state permeation rates are measured with a mass-spectrometer directly connected to the downstream side of a membrane cell. A built-in nanoaperture is used as a reference to calibrate the detector in situ. A feed compartment is designed in a way that allows for preparing gaseous mixtures of variable composition, including vapours of volatile liquids. Room-temperature measurements with carbon nanomembranes confirm that this material is selective to water vapour and can efficiently separate it from mixtures with a variety of gases and organic compounds. We demonstrate that a high permeance for water is maintained regardless of the molar fraction and discuss its strong pressure dependence by invoking adsorption-related formalism.

Graphical abstract: Vapour permeation measurements with free-standing nanomembranes

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Publication details

The article was received on 29 May 2019, accepted on 25 Jun 2019 and first published on 25 Jun 2019


Article type: Paper
DOI: 10.1039/C9CP03038G
Phys. Chem. Chem. Phys., 2019,21, 15471-15477

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    Vapour permeation measurements with free-standing nanomembranes

    P. Dementyev, T. Wilke, D. Naberezhnyi, D. Emmrich and A. Gölzhäuser, Phys. Chem. Chem. Phys., 2019, 21, 15471
    DOI: 10.1039/C9CP03038G

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