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Title: Trapping gases in metal-organic frameworks with a selective surface molecular barrier layer

Journal Article · · Nature Communications
DOI:https://doi.org/10.1038/ncomms13871· OSTI ID:1361675
 [1];  [2];  [1];  [1];  [1];  [3];  [3];  [4];  [1]
  1. Univ. of Texas-Dallas, Richardson, TX (United States). Dept. of Materials Science & Engineering
  2. Wake Forest Univ., Winston-Salem, NC (United States). Dept. of Physics
  3. Rutgers Univ., Piscataway, NJ (United States). Dept. of Chemistry and Chemical Biology
  4. Wake Forest Univ., Winston-Salem, NC (United States). Dept. of Physics; Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Chemistry

The main challenge for gas storage and separation in nanoporous materials is that many molecules of interest adsorb too weakly to be effectively retained. Instead of synthetically modifying the internal surface structure of the entire bulk—as is typically done to enhance adsorption—here we show that post exposure of a prototypical porous metal-organic framework to ethylenediamine can effectively retain a variety of weakly adsorbing molecules (for example, CO, CO2, SO2, C2H4, NO) inside the materials by forming a monolayer-thick cap at the external surface of microcrystals. Furthermore, this capping mechanism, based on hydrogen bonding as explained by ab initio modelling, opens the door for potential selectivity. For example, water molecules are shown to disrupt the hydrogen-bonded amine network and diffuse through the cap without hindrance and fully displace/release the retained small molecules out of the metal-organic framework at room temperature. Lastly, these findings may provide alternative strategies for gas storage, delivery and separation.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Univ. of Texas at Dallas, Richardson, TX (United States); UT-Battelle LLC/ORNL, Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-08ER46491; AC05-00OR22725
OSTI ID:
1361675
Journal Information:
Nature Communications, Vol. 7; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 56 works
Citation information provided by
Web of Science

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CoFe 2 O 4 /TMU-17-NH 2 as a hybrid magnetic nanocomposite catalyst for multicomponent synthesis of dihydropyrimidines: A new magnetic MOF was prepared via embedding approach journal October 2018
Anchoring Co II Ions into a Thiol‐Laced Metal–Organic Framework for Efficient Visible‐Light‐Driven Conversion of CO 2 into CO journal April 2019
Constructing nanostructured silicates on diatomite for Pb(II) and Cd(II) removal journal February 2019
Enhancing the stability and porosity of penetrated metal–organic frameworks through the insertion of coordination sites journal January 2018
van der Waals density functional with corrected C 6 coefficients journal May 2019
Dissolving uptake-hindering surface defects in metal–organic frameworks text January 2018