TY  - JOUR
A1  - Harmanli, İpek
A1  - Tarakina, Nadezda
A1  - Antonietti, Markus
A1  - Oschatz, Martin
T1  - "Giant" nitrogen uptake in ionic liquids confined in carbon pores
T2  - Journal of the American Chemical Society
N2  - Ionic liquids are well known for their high gas absorption capacity. It is shown that this is not a solvent constant, but can be enhanced by another factor of 10 by pore confinement, here of the ionic liquid (IL) 1-ethyl-3-methylimidazolium acetate (EmimOAc) in the pores of carbon materials. A matrix of four different carbon compounds with micro- and mesopores as well as with and without nitrogen doping is utilized to investigate the influence of the carbons structure on the nitrogen uptake in the pore-confined EmimOAc. In general, the absorption is most improved for IL in micropores and in nitrogen-doped carbon. This effect is so large that it is already seen in TGA and DSC experiments. Due to the low vapor pressure of the IL, standard volumetric sorption experiments can be used to quantify details of this effect. It is reasoned that it is the change of the molecular arrangement of the ions in the restricted space of the pores that creates additional free volume to host molecular nitrogen.
Y1  - 2021
UR  - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/61913
SN  - 0002-7863
SN  - 1520-5126
VL  - 143
IS  - 25
SP  - 9377
EP  - 9384
PB  - American Chemical Society
CY  - Washington
ER  -