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  “Giant” nitrogen uptake in ionic liquids confined in carbon pores

Harmanli, I., Tarakina, N. V., Antonietti, M., & Oschatz, M. (2021). “Giant” nitrogen uptake in ionic liquids confined in carbon pores. Journal of the American Chemical Society, 143(25), 9377-9384. doi:10.1021/jacs.1c00783.

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Harmanli, Ipek1, Author              
Tarakina, Nadezda V.2, Author              
Antonietti, Markus3, Author              
Oschatz, Martin1, Author              
Affiliations:
1Martin Oschatz, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_2364733              
2Nadezda V. Tarakina, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_2522693              
3Markus Antonietti, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_1863321              

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 Abstract: 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.

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Language(s): eng - English
 Dates: 2021-06-152021
 Publication Status: Published in print
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 Identifiers: DOI: 10.1021/jacs.1c00783
BibTex Citekey: doi:10.1021/jacs.1c00783
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Title: Journal of the American Chemical Society
  Other : JACS
  Abbreviation : J. Am. Chem. Soc.
Source Genre: Journal
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Publ. Info: Washington, DC : American Chemical Society
Pages: - Volume / Issue: 143 (25) Sequence Number: - Start / End Page: 9377 - 9384 Identifier: ISSN: 0002-7863