SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 4: Mini-Symposium: Free-standing functional molecular 2D materials I
O 4.2: Vortrag
Montag, 1. März 2021, 11:00–11:15, R2
Ultrahigh ionic exclusion through 1-nm-thick carbon nanomembranes — •Yang Yang1,2, Roland Hillmann1, Yubo Qi1, Riko Korzetz1, Niklas Biere1, Daniel Emmrich1, Michael Westphal1, Björn Büker1, Andreas Hütten1, André Beyer1, Dario Anselmetti1, and Armin Gölzhäuser1 — 1Faculty of Physics, Bielefeld University, Germany — 2Department of Chemical Engineering, Imperial College London, UK
The "single-file" transport of water in natural nanoconduits (i.e., aquaporins) inspires the development of high-performance artificial membranes for water purification. In particular, 2D materials open a path to new filtration processes. However, a key challenge has been finding an effective way to create a large number of narrow channels in the material to realize the desired high water permeance and high ion rejection. Carbon Nanomembranes (CNMs) are 2D carbon sheets fabricated from crosslinking of self-assembled monolayers. This work will show that a ~1.2 nm thick CNM made of terphenylthiol (TPT) precursors possesses a very high density (~10^18 m^2, i.e., 1 sub-nm pore per square nanometer) of sub-nm channels. TPT CNMs let water pass very quickly, but hinder the passing of ions including protons. The membrane resistance in 1 M chloride solutions reaches ~104 Ω cm^2, comparably high to that of lipid bilayers. TPT CNMs show a ~80 times enhancement in water productivity over the commercial forward osmosis membranes. These observations encourage the use of CNMs for producing clean water. The versatile manufacturing process also enables CNM functions to be customized at a molecular level.