| Title: | Vapour permeation measurements with free-standing nanomembranes |
| Author(s): | Dementyev P; Wilke T; Naberezhnyi D; Emmrich D; Golzhauser A; |
| Address: | "Physics of Supramolecular Systems and Surfaces, Faculty of Physics, Bielefeld University, Bielefeld, 33615, Germany. dementyev@physik.uni-bielefeld.de" |
| ISSN/ISBN: | 1463-9084 (Electronic) 1463-9076 (Linking) |
| 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" |
| Notes: | "PubMed-not-MEDLINEDementyev, Petr Wilke, Timo Naberezhnyi, Daniil Emmrich, Daniel Golzhauser, Armin eng England 2019/07/02 Phys Chem Chem Phys. 2019 Jul 17; 21(28):15471-15477. doi: 10.1039/c9cp03038g" |
