Official websites use. Share sensitive information only on official, secure websites. Their ultimate thickness not only ensures the shortest diffusion pathways, but also makes the membrane surface play a significant role in accommodating and guiding the permeating molecules.
Here, we present a spectroscopic experiment to probe adsorption of condensable species on 2D membranes under realistic conditions. The measurements are demonstrated to yield quantitative information on the amount of adsorbates onto supported 2D layers.
As a case study, the azeotropic mixture of water and propanol is revealed to maintain its molar composition upon interaction with carbon nanomembranes. Keywords: two-dimensional membranes, vapor permeation, vapor adsorption, infrared reflection absorption spectroscopy, azeotropes. A new experiment is introduced to study the interaction of vaporous substances with 2D membranes.
Infrared spectroscopy is shown to provide knowledge on the amount of adsorbed species under varied conditions. Water vapor mixed with propanol is found to condense on the membrane surface with the same molar proportions as in the original feed mixture.
Unlike artificially pierced graphene, intrinsically porous 2D membranes exhibit monodisperse or very narrow size distributions and high areal densities of nanoscopic pores.
